/* roulang page: index */
:root {
    --primary: #1a4fc4;
    --primary-dark: #0d3a8d;
    --primary-light: #e8efff;
    --secondary: #ff6a2b;
    --secondary-light: #fff1e8;
    --accent: #00b5a5;
    --accent-light: #e6f8f6;
    --dark: #0b1a33;
    --dark-2: #10264a;
    --bg: #f5f8fc;
    --surface: #ffffff;
    --text: #14263d;
    --text-light: #5f7090;
    --text-muted: #8796ad;
    --border: #dce5f0;
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 22px;
    --shadow-sm: 0 2px 10px rgba(16, 42, 75, 0.06);
    --shadow: 0 8px 30px rgba(16, 42, 75, 0.08);
    --shadow-lg: 0 18px 48px rgba(16, 42, 75, 0.13);
    --container: 1200px;
    --space: 96px;
    --space-md: 64px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  img {
    max-width: 100%;
    display: block;
  }

  a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
  }

  a:hover {
    color: var(--primary-dark);
  }

  ul,
  ol {
    list-style: none;
  }

  button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
  }

  input {
    font-family: inherit;
    border: none;
    outline: none;
  }

  ::selection {
    background: var(--primary);
    color: #fff;
  }

  :focus-visible {
    outline: 3px solid rgba(26, 79, 196, 0.35);
    outline-offset: 2px;
  }

  .container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
  }

  .section {
    padding: var(--space) 0;
    position: relative;
  }

  .section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 56px;
  }

  .section-tag {
    display: inline-block;
    padding: 5px 16px;
    border-radius: 30px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
  }

  .section-head h2 {
    font-size: 34px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--dark);
    margin-bottom: 12px;
  }

  .section-head p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.7;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
  }

  .btn i {
    font-size: 14px;
  }

  .btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 8px 24px rgba(26, 79, 196, 0.28);
  }

  .btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(26, 79, 196, 0.35);
  }

  .btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.6);
  }

  .btn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: #fff;
    transform: translateY(-2px);
  }

  .btn-light {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
  }

  .btn-light:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
  }

  .btn-dark {
    background: var(--dark);
    color: #fff;
  }

  .btn-dark:hover {
    background: var(--dark-2);
    color: #fff;
    transform: translateY(-2px);
  }

  /* Badge */
  .badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 30px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.6;
    background: var(--primary-light);
    color: var(--primary);
  }

  .badge-accent {
    background: var(--accent-light);
    color: var(--accent);
  }

  .badge-warm {
    background: var(--secondary-light);
    color: var(--secondary);
  }

  .badge-dark {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    backdrop-filter: blur(4px);
  }

  /* Header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220, 229, 240, 0.6);
    box-shadow: 0 2px 16px rgba(16, 42, 75, 0.04);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    height: 76px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }

  .brand-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    box-shadow: 0 6px 18px rgba(26, 79, 196, 0.3);
  }

  .brand-text {
    font-size: 21px;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: 0.3px;
    white-space: nowrap;
  }

  .brand-text span {
    color: var(--primary);
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
  }

  .nav-link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    padding: 8px 2px;
    white-space: nowrap;
  }

  .nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
  }

  .nav-link:hover {
    color: var(--primary);
  }

  .nav-link:hover::after,
  .nav-link.active::after {
    transform: scaleX(1);
  }

  .nav-link.active {
    color: var(--primary);
    font-weight: 600;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
  }

  .btn-login {
    padding: 9px 22px;
    font-size: 14px;
    border-radius: 40px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(26, 79, 196, 0.24);
    white-space: nowrap;
  }

  .btn-login:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26, 79, 196, 0.3);
  }

  .menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 20px;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  /* Hero */
  .hero {
    position: relative;
    padding: 130px 0 150px;
    background: linear-gradient(135deg, rgba(6, 20, 45, 0.94) 0%, rgba(13, 42, 89, 0.88) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
    color: #fff;
    overflow: hidden;
  }

  .hero::before {
    content: "";
    position: absolute;
    top: -80px;
    right: -80px;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 106, 43, 0.25) 0%, transparent 70%);
    pointer-events: none;
  }

  .hero::after {
    content: "";
    position: absolute;
    bottom: -120px;
    left: -60px;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26, 79, 196, 0.35) 0%, transparent 70%);
    pointer-events: none;
  }

  .hero-inner {
    position: relative;
    z-index: 2;
    max-width: 760px;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 28px;
    backdrop-filter: blur(8px);
    letter-spacing: 1px;
  }

  .hero-badge i {
    color: var(--secondary);
  }

  .hero h1 {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: 1px;
  }

  .hero h1 span {
    color: var(--secondary);
  }

  .hero-desc {
    font-size: 18px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    max-width: 580px;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    margin-bottom: 44px;
  }

  .hero-search {
    display: flex;
    align-items: center;
    max-width: 520px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    padding: 6px 6px 6px 20px;
    backdrop-filter: blur(10px);
  }

  .hero-search i {
    color: rgba(255, 255, 255, 0.6);
    font-size: 15px;
  }

  .hero-search input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 12px;
    color: #fff;
    font-size: 14px;
  }

  .hero-search input::placeholder {
    color: rgba(255, 255, 255, 0.5);
  }

  .hero-search input:focus {
    outline: none;
  }

  .hero-search button {
    padding: 10px 24px;
    border-radius: 40px;
    background: #fff;
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    transition: var(--transition);
  }

  .hero-search button:hover {
    background: var(--primary-light);
  }

  .hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-top: 48px;
  }

  .hero-meta-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.75);
  }

  .hero-meta-item i {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--secondary);
  }

  /* Stats */
  .stats {
    background: var(--dark);
    padding: 60px 0;
    margin-top: -1px;
    position: relative;
    background-image: linear-gradient(135deg, rgba(13, 42, 89, 0.4) 0%, rgba(6, 20, 45, 0.4) 100%), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  }

  .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
  }

  .stat-item {
    text-align: center;
    padding: 20px 12px;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition);
  }

  .stat-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
  }

  .stat-num {
    font-size: 38px;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 4px;
    letter-spacing: -0.5px;
  }

  .stat-num span {
    color: var(--secondary);
  }

  .stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.65);
  }

  /* Categories */
  .categories {
    background: var(--bg);
  }

  .cat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .cat-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: block;
    color: var(--text);
  }

  .cat-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    color: var(--text);
  }

  .cat-cover {
    position: relative;
    height: 210px;
    overflow: hidden;
  }

  .cat-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

  .cat-card:hover .cat-cover img {
    transform: scale(1.06);
  }

  .cat-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(6, 20, 45, 0.1) 0%, rgba(6, 20, 45, 0.55) 100%);
  }

  .cat-cover-icon {
    position: absolute;
    bottom: 18px;
    left: 22px;
    z-index: 2;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
  }

  .cat-body {
    padding: 24px 24px 28px;
  }

  .cat-body h3 {
    font-size: 21px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark);
  }

  .cat-body p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 18px;
  }

  .cat-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
  }

  .cat-link i {
    transition: transform 0.3s ease;
    font-size: 12px;
  }

  .cat-card:hover .cat-link i {
    transform: translateX(5px);
  }

  /* Features */
  .features {
    background: var(--surface);
  }

  .features-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
  }

  .features-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
  }

  .features-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 420px;
  }

  .features-visual::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26, 79, 196, 0.2) 0%, rgba(6, 20, 45, 0.6) 100%);
  }

  .features-visual-tag {
    position: absolute;
    bottom: 24px;
    left: 24px;
    right: 24px;
    z-index: 2;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    padding: 20px;
    color: #fff;
  }

  .features-visual-tag h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
  }

  .features-visual-tag p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
  }

  .features-content h2 {
    font-size: 30px;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.35;
    margin-bottom: 14px;
  }

  .features-content>p {
    color: var(--text-light);
    font-size: 15px;
    margin-bottom: 32px;
    line-height: 1.8;
  }

  .feature-list {
    display: flex;
    flex-direction: column;
    gap: 22px;
  }

  .feature-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 18px;
    border-radius: var(--radius);
    background: var(--bg);
    border: 1px solid transparent;
    transition: var(--transition);
  }

  .feature-item:hover {
    border-color: var(--border);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
  }

  .feature-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary);
    background: var(--primary-light);
  }

  .feature-item h3 {
    font-size: 17px;
    font-weight: 650;
    color: var(--dark);
    margin-bottom: 4px;
  }

  .feature-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
  }

  /* Process */
  .process {
    background: var(--bg);
  }

  .steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    position: relative;
  }

  .steps-grid::before {
    content: "";
    position: absolute;
    top: 44px;
    left: 12%;
    right: 12%;
    height: 2px;
    background: linear-gradient(90deg, var(--border), var(--primary), var(--border));
    border-radius: 2px;
  }

  .step-item {
    position: relative;
    text-align: center;
    padding: 0 12px;
  }

  .step-num {
    position: relative;
    z-index: 2;
    width: 88px;
    height: 88px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: var(--surface);
    border: 3px solid var(--primary);
    box-shadow: 0 8px 24px rgba(26, 79, 196, 0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    font-weight: 800;
    color: var(--primary);
  }

  .step-item h3 {
    font-size: 18px;
    font-weight: 650;
    color: var(--dark);
    margin-bottom: 8px;
  }

  .step-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
  }

  /* Latest News */
  .latest {
    background: var(--surface);
  }

  .article-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .article-item {
    display: block;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    color: var(--text);
  }

  .article-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: transparent;
    background: var(--surface);
  }

  .article-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
  }

  .article-time {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .article-item h3 {
    font-size: 18px;
    font-weight: 650;
    color: var(--dark);
    margin-bottom: 10px;
    line-height: 1.5;
    transition: var(--transition);
  }

  .article-item:hover h3 {
    color: var(--primary);
  }

  .article-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .article-readmore {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
  }

  .article-readmore i {
    font-size: 12px;
    transition: transform 0.3s ease;
  }

  .article-item:hover .article-readmore i {
    transform: translateX(4px);
  }

  .empty-tip {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px;
    color: var(--text-muted);
    font-size: 16px;
    background: var(--bg);
    border-radius: var(--radius);
  }

  .latest-footer {
    text-align: center;
    margin-top: 40px;
  }

  /* FAQ */
  .faq-section {
    background: var(--bg);
  }

  .faq-list {
    max-width: 820px;
    margin: 0 auto;
  }

  .faq-item {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
  }

  .faq-item.active {
    box-shadow: var(--shadow);
    border-color: rgba(26, 79, 196, 0.25);
  }

  .faq-question {
    width: 100%;
    padding: 22px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    transition: var(--transition);
    cursor: pointer;
  }

  .faq-question:hover {
    color: var(--primary);
  }

  .faq-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
    transition: var(--transition);
  }

  .faq-item.active .faq-icon {
    transform: rotate(45deg);
    background: var(--primary);
    color: #fff;
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }

  .faq-answer-inner {
    padding: 0 28px 24px;
    font-size: 14.5px;
    color: var(--text-light);
    line-height: 1.8;
    border-top: 1px dashed var(--border);
    padding-top: 18px;
    margin-top: 0;
  }

  /* CTA */
  .cta {
    position: relative;
    padding: 90px 0;
    background: linear-gradient(120deg, rgba(8, 22, 50, 0.95) 0%, rgba(20, 55, 110, 0.9) 100%), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
    text-align: center;
    color: #fff;
  }

  .cta h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
  }

  .cta p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.8;
  }

  .cta-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

  .cta-note {
    margin-top: 24px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
  }

  /* Footer */
  .site-footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 70px 0 0;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    gap: 48px;
    margin-bottom: 50px;
  }

  .footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
  }

  .footer-brand-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 17px;
  }

  .footer-brand-name {
    font-size: 19px;
    font-weight: 700;
    color: #fff;
  }

  .footer-desc {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
    max-width: 320px;
  }

  .footer-social {
    display: flex;
    gap: 10px;
  }

  .footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: var(--transition);
  }

  .footer-social a:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
  }

  .footer-title {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 18px;
  }

  .footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: var(--transition);
  }

  .footer-links a:hover {
    color: #fff;
    padding-left: 4px;
  }

  .footer-contact {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
  }

  .contact-item i {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--secondary);
    flex-shrink: 0;
  }

  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 22px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.45);
  }

  .footer-bottom-links {
    display: flex;
    gap: 24px;
  }

  .footer-bottom-links a {
    color: rgba(255, 255, 255, 0.45);
    font-size: 13px;
  }

  .footer-bottom-links a:hover {
    color: #fff;
  }

  /* Responsive */
  @media (max-width: 1024px) {
    :root {
      --space: 72px;
    }

    .main-nav {
      gap: 20px;
    }

    .hero h1 {
      font-size: 42px;
    }

    .features-grid {
      grid-template-columns: 1fr;
      gap: 40px;
    }

    .features-visual img {
      min-height: 320px;
    }

    .steps-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 36px;
    }

    .steps-grid::before {
      display: none;
    }

    .footer-grid {
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
  }

  @media (max-width: 768px) {
    :root {
      --space: 56px;
      --space-md: 40px;
    }

    .header-inner {
      height: 66px;
    }

    .menu-toggle {
      display: flex;
    }

    .main-nav {
      position: fixed;
      top: 66px;
      left: 0;
      right: 0;
      background: #fff;
      flex-direction: column;
      align-items: flex-start;
      padding: 16px 24px 24px;
      gap: 4px;
      box-shadow: 0 16px 32px rgba(16, 42, 75, 0.12);
      transform: translateY(-120%);
      opacity: 0;
      pointer-events: none;
      transition: transform 0.35s ease, opacity 0.35s ease;
      border-bottom: 1px solid var(--border);
      z-index: 99;
    }

    .main-nav.open {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }

    .nav-link {
      display: block;
      width: 100%;
      padding: 12px 8px;
      font-size: 16px;
      border-bottom: 1px solid var(--bg);
    }

    .nav-link::after {
      display: none;
    }

    .header-actions {
      margin-left: auto;
    }

    .hero {
      padding: 90px 0 110px;
    }

    .hero h1 {
      font-size: 34px;
    }

    .hero-desc {
      font-size: 16px;
    }

    .hero-actions {
      flex-direction: column;
      align-items: stretch;
    }

    .hero-search {
      max-width: none;
    }

    .hero-meta {
      flex-direction: column;
      gap: 12px;
    }

    .stats-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .cat-grid {
      grid-template-columns: 1fr;
      gap: 20px;
    }

    .cat-cover {
      height: 190px;
    }

    .section-head h2 {
      font-size: 26px;
    }

    .article-grid {
      grid-template-columns: 1fr;
    }

    .steps-grid {
      grid-template-columns: 1fr;
      gap: 28px;
    }

    .step-num {
      width: 72px;
      height: 72px;
      font-size: 22px;
    }

    .cta h2 {
      font-size: 28px;
    }

    .footer-grid {
      grid-template-columns: 1fr;
      gap: 32px;
    }

    .footer-bottom {
      flex-direction: column;
      justify-content: center;
      text-align: center;
    }
  }

  @media (max-width: 520px) {
    .container {
      padding: 0 16px;
    }

    .brand-text {
      font-size: 18px;
    }

    .hero h1 {
      font-size: 28px;
    }

    .hero-desc {
      font-size: 15px;
    }

    .hero-actions .btn {
      width: 100%;
    }

    .stats-grid {
      grid-template-columns: 1fr 1fr;
    }

    .stat-num {
      font-size: 28px;
    }

    .section-head h2 {
      font-size: 23px;
    }

    .feature-item {
      flex-direction: column;
    }

    .feature-icon {
      width: 44px;
      height: 44px;
    }

    .btn {
      padding: 11px 20px;
      font-size: 14px;
    }

    .faq-question {
      padding: 18px 20px;
      font-size: 15px;
    }

    .faq-answer-inner {
      padding: 0 20px 20px;
      font-size: 14px;
    }

    .cta-actions .btn {
      width: 100%;
    }

    .footer-bottom-links {
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
    }
  }

/* roulang page: category1 */
:root {
            --primary: #3B7CFF;
            --primary-dark: #2A5FE0;
            --primary-light: #EBF1FF;
            --accent: #12B77B;
            --accent-dark: #0EA06A;
            --accent-light: #E6FAF3;
            --dark: #0E1E30;
            --dark-soft: #16293F;
            --bg: #F5F9FE;
            --bg-white: #FFFFFF;
            --text: #1A2B4A;
            --text-light: #5A6C8A;
            --text-lighter: #8A9BB5;
            --border: #E3EAF5;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 8px 30px rgba(24, 55, 116, 0.08);
            --shadow-lg: 0 16px 48px rgba(24, 55, 116, 0.12);
            --transition: all 0.3s ease;
            --container: 1200px;
            --header-h: 72px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
            border-radius: var(--radius);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        ul,
        ol {
            list-style: none;
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(227, 234, 245, 0.8);
            transition: var(--transition);
        }

        .site-header.scrolled {
            box-shadow: var(--shadow);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--primary), #6A9FFF);
            color: #fff;
            font-size: 22px;
            font-weight: 800;
            border-radius: 12px;
            box-shadow: 0 6px 16px rgba(59, 124, 255, 0.35);
        }

        .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-item {
            position: relative;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-link .fa-chevron-down {
            font-size: 11px;
            opacity: 0.7;
            transition: transform 0.3s;
        }

        .nav-item:hover .fa-chevron-down {
            transform: rotate(180deg);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            line-height: 1.4;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(59, 124, 255, 0.4);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 20px rgba(59, 124, 255, 0.25);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(59, 124, 255, 0.3);
        }

        .btn-light {
            background: #fff;
            color: var(--primary);
        }

        .btn-light:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-outline-light {
            border-color: rgba(255, 255, 255, 0.6);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: #fff;
            transform: translateY(-2px);
        }

        .hl-btn {
            background: var(--accent);
            color: #fff;
        }

        .hl-btn:hover {
            background: var(--accent-dark);
            color: #fff;
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 14px;
            border-radius: 8px;
        }

        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 18px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .nav-toggle:hover {
            background: var(--primary);
            color: #fff;
        }

        /* Mega Menu Dropdown */
        .dropdown-panel {
            position: absolute;
            top: calc(100% + 14px);
            left: 50%;
            transform: translateX(-50%) translateY(8px);
            width: 560px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            padding: 24px;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 50;
        }

        .nav-item:hover .dropdown-panel {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }

        .dropdown-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1.2fr;
            gap: 20px;
        }

        .dropdown-col {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .dropdown-label {
            font-size: 12px;
            font-weight: 700;
            color: var(--text-lighter);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 6px;
        }

        .dropdown-col a {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            padding: 6px 10px;
            border-radius: 8px;
            transition: var(--transition);
        }

        .dropdown-col a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }

        .dropdown-highlight {
            background: var(--primary-light);
            border-radius: var(--radius-sm);
            padding: 14px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .dropdown-highlight img {
            border-radius: 8px;
            object-fit: cover;
            height: 90px;
            width: 100%;
        }

        .dropdown-link-more {
            font-size: 13px;
            font-weight: 700;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .dropdown-link-more:hover {
            color: var(--primary-dark);
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 110px 0 90px;
            overflow: hidden;
            background: var(--dark);
        }

        .banner-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.5;
        }

        .page-banner::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(75deg, rgba(14, 30, 48, 0.88) 0%, rgba(14, 30, 48, 0.62) 100%);
        }

        .banner-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }

        .banner-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.14);
            backdrop-filter: blur(6px);
            padding: 7px 16px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 700;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
            margin-bottom: 20px;
        }

        .banner-tag i {
            color: var(--accent);
        }

        .page-banner h1 {
            font-size: 44px;
            line-height: 1.2;
            font-weight: 800;
            color: #fff;
            margin-bottom: 18px;
            letter-spacing: -1px;
        }

        .banner-desc {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.8;
            max-width: 620px;
        }

        .banner-breadcrumb {
            margin-top: 28px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }

        .banner-breadcrumb a {
            color: rgba(255, 255, 255, 0.9);
        }

        .banner-breadcrumb a:hover {
            color: #fff;
        }

        .banner-breadcrumb i {
            font-size: 11px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== Section ===== */
        .section {
            padding: 90px 0;
        }

        .section-alt {
            background: var(--bg-white);
        }

        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }

        .section-head-left {
            text-align: left;
            margin: 0 0 56px;
            max-width: 640px;
        }

        .section-eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 800;
            color: var(--primary);
            background: var(--primary-light);
            padding: 6px 16px;
            border-radius: 100px;
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }

        .section-head h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.6px;
            line-height: 1.25;
            margin-bottom: 14px;
        }

        .section-head p {
            font-size: 16px;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ===== Grid ===== */
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        /* ===== Feature Card ===== */
        .feature-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 36px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            text-align: left;
        }

        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), #6A9FFF);
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 60px;
            height: 60px;
            border-radius: 16px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 24px;
            margin-bottom: 22px;
            transition: var(--transition);
        }

        .feature-card:nth-child(2) .feature-icon {
            background: var(--accent-light);
            color: var(--accent);
        }

        .feature-card:nth-child(3) .feature-icon {
            background: #FFF4E5;
            color: #F59E0B;
        }

        .feature-card:nth-child(4) .feature-icon {
            background: #F3EBFF;
            color: #8B5CF6;
        }

        .feature-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        .feature-card .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 12px;
            font-weight: 700;
            color: var(--primary);
            background: var(--primary-light);
            padding: 4px 12px;
            border-radius: 100px;
            margin-top: 14px;
        }

        /* ===== Split Block ===== */
        .split-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .split-media {
            position: relative;
        }

        .split-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
        }

        .split-media::after {
            content: "";
            position: absolute;
            bottom: -16px;
            right: -16px;
            width: 160px;
            height: 160px;
            background: var(--primary-light);
            border-radius: var(--radius-lg);
            z-index: -1;
        }

        .split-content h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.6px;
            line-height: 1.3;
            margin-bottom: 20px;
        }

        .split-content .section-eyebrow {
            margin-bottom: 14px;
        }

        .steps-list {
            margin: 24px 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .steps-list li {
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }

        .step-number {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 800;
            font-size: 14px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .steps-list li h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 4px;
        }

        .steps-list li p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== Info Card ===== */
        .info-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            transition: var(--transition);
            text-align: left;
        }

        .info-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-4px);
            border-color: var(--primary);
        }

        .info-card .info-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 18px;
        }

        .info-card:nth-child(2) .info-icon {
            background: #FFF4E5;
            color: #F59E0B;
        }

        .info-card:nth-child(3) .info-icon {
            background: var(--accent-light);
            color: var(--accent);
        }

        .info-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }

        .info-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        .info-card a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 700;
            color: var(--primary);
            margin-top: 14px;
        }

        .info-card a:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        /* ===== Stats Section ===== */
        .section-stats {
            background: linear-gradient(135deg, var(--dark) 0%, #12294A 50%, #0B1E38 100%);
            position: relative;
            overflow: hidden;
        }

        .section-stats::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -80px;
            width: 360px;
            height: 360px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 124, 255, 0.28) 0%, transparent 70%);
        }

        .section-stats::after {
            content: "";
            position: absolute;
            bottom: -100px;
            left: -60px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(18, 183, 123, 0.16) 0%, transparent 70%);
        }

        .stats-grid {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }

        .stats-item {
            text-align: center;
            padding: 20px;
        }

        .stats-num {
            font-size: 48px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -1px;
            line-height: 1.2;
        }

        .stats-num span {
            color: var(--accent);
        }

        .stats-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 8px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question i {
            font-size: 14px;
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }

        .faq-item.active .faq-question i {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }

        .faq-answer-inner {
            padding: 0 24px 22px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.8;
            border-top: 1px solid var(--border);
            padding-top: 16px;
            margin-top: 0;
        }

        /* ===== CTA ===== */
        .section-cta {
            padding: 70px 0;
        }

        .cta-box {
            background: linear-gradient(120deg, var(--primary) 0%, #5B8DFF 100%);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-box::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
        }

        .cta-box::after {
            content: "";
            position: absolute;
            bottom: -60px;
            left: -30px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
        }

        .cta-box h2 {
            font-size: 30px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .cta-box p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 500px;
            margin-bottom: 28px;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            justify-content: center;
            position: relative;
            z-index: 2;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
            gap: 40px;
            padding-bottom: 44px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }

        .footer-brand-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary), #6A9FFF);
            color: #fff;
            font-size: 20px;
            font-weight: 800;
            border-radius: 10px;
        }

        .footer-brand-name {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
        }

        .footer-desc {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 300px;
        }

        .footer-social {
            display: flex;
            gap: 10px;
            margin-top: 20px;
        }

        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            transition: var(--transition);
        }

        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 12px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
        }

        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .contact-item i {
            color: var(--accent);
            width: 18px;
            text-align: center;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }

        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.4);
            transition: var(--transition);
        }

        .footer-bottom-links a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }

            .dropdown-panel {
                left: auto;
                right: 0;
                transform: translateY(8px);
                width: 480px;
            }

            .nav-item:hover .dropdown-panel {
                transform: translateY(0);
            }

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            body {
                font-size: 15px;
            }

            .header-inner {
                height: 64px;
            }

            .site-header {
                height: 64px;
            }

            .brand-icon {
                width: 36px;
                height: 36px;
                font-size: 18px;
            }

            .brand-name {
                font-size: 18px;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                bottom: 0;
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                padding: 24px;
                gap: 8px;
                transform: translateX(100%);
                transition: transform 0.35s ease;
                overflow-y: auto;
                z-index: 99;
                box-shadow: -8px 0 30px rgba(0, 0, 0, 0.06);
                border-top: 1px solid var(--border);
            }

            .main-nav.open {
                transform: translateX(0);
            }

            .main-nav .nav-link {
                padding: 14px 16px;
                font-size: 17px;
                border-radius: 12px;
                width: 100%;
            }

            .nav-item {
                width: 100%;
            }

            .dropdown-panel {
                display: none;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .page-banner {
                padding: 80px 0 60px;
            }

            .page-banner h1 {
                font-size: 32px;
            }

            .banner-desc {
                font-size: 16px;
            }

            .section {
                padding: 64px 0;
            }

            .section-head h2 {
                font-size: 28px;
            }

            .split-block {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .split-media::after {
                display: none;
            }

            .grid-3 {
                grid-template-columns: 1fr;
            }

            .cta-box {
                padding: 40px 24px;
            }

            .cta-box h2 {
                font-size: 24px;
            }

            .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }

            .grid-4 {
                grid-template-columns: 1fr;
            }

            .page-banner h1 {
                font-size: 27px;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }

            .stats-num {
                font-size: 34px;
            }

            .faq-question {
                padding: 16px 18px;
                font-size: 15px;
            }

            .faq-answer-inner {
                padding: 0 18px 18px;
            }
        }

/* roulang page: article */
:root {
            --primary: #1a56db;
            --primary-dark: #1e40af;
            --primary-light: #dbeafe;
            --accent: #d97706;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --surface: #ffffff;
            --text: #0f172a;
            --text-light: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);
            --space: 24px;
            --header-height: 72px;
            --transition: 0.25s ease;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 999px;
            transition: background var(--transition), box-shadow var(--transition), transform var(--transition), color var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.45);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary-light);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
        }
        .btn-white:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .badge-accent {
            background: var(--accent-light);
            color: var(--accent);
        }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-eyebrow {
            display: inline-block;
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text);
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-light);
            line-height: 1.8;
        }
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            height: var(--header-height);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 20px;
            font-weight: 800;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.35);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin-left: 24px;
        }
        .nav-link {
            padding: 10px 18px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            border-radius: 999px;
            transition: background var(--transition), color var(--transition);
            line-height: 1.2;
        }
        .nav-link:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .nav-link.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-left: auto;
        }
        .btn-header {
            padding: 9px 22px;
            font-size: 14px;
        }
        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background var(--transition);
            border: none;
            flex-shrink: 0;
        }
        .nav-toggle:hover {
            background: var(--primary);
            color: #fff;
        }
        .page-hero {
            position: relative;
            padding: 72px 0 64px;
            background: linear-gradient(135deg, rgba(2, 6, 23, 0.92), rgba(30, 64, 175, 0.88)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: #fff;
            overflow: hidden;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            bottom: -40px;
            right: -40px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.3), transparent 60%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 24px;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb-sep {
            color: rgba(255, 255, 255, 0.4);
        }
        .page-title {
            font-size: 40px;
            font-weight: 800;
            line-height: 1.3;
            max-width: 860px;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .page-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 18px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
        }
        .page-meta .badge {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            backdrop-filter: blur(4px);
        }
        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 340px;
            gap: 48px;
            padding: 56px 0 80px;
        }
        .article-main {
            background: var(--surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            padding: 48px 52px;
            border: 1px solid var(--border);
            overflow: hidden;
        }
        .article-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
            word-break: break-word;
        }
        .article-content>* {
            margin-bottom: 1.5em;
        }
        .article-content h2 {
            font-size: 26px;
            font-weight: 700;
            margin-top: 2em;
            margin-bottom: 1em;
            padding-bottom: 0.5em;
            border-bottom: 2px solid var(--primary-light);
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .article-content h3 {
            font-size: 20px;
            font-weight: 600;
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            color: var(--text);
        }
        .article-content h4 {
            font-size: 18px;
            font-weight: 600;
            margin-top: 1.5em;
            margin-bottom: 0.6em;
        }
        .article-content p {
            margin-bottom: 1.5em;
            color: var(--text-light);
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 4px;
        }
        .article-content a:hover {
            color: var(--primary-dark);
        }
        .article-content ul,
        .article-content ol {
            margin: 1.2em 0;
            padding-left: 1.6em;
            color: var(--text-light);
        }
        .article-content ul li,
        .article-content ol li {
            margin-bottom: 0.6em;
            position: relative;
        }
        .article-content ul li::before {
            content: '•';
            color: var(--primary);
            font-weight: 700;
            position: absolute;
            left: -1.2em;
        }
        .article-content ol {
            counter-reset: article-ol;
        }
        .article-content ol li {
            counter-increment: article-ol;
        }
        .article-content ol li::before {
            content: counter(article-ol) '.';
            color: var(--primary);
            font-weight: 700;
            position: absolute;
            left: -1.8em;
        }
        .article-content img {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 1.6em 0;
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 1.2em 1.6em;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.6em 0;
            color: var(--text-light);
            font-style: normal;
        }
        .article-content blockquote p:last-child {
            margin-bottom: 0;
        }
        .article-content pre {
            background: #0f172a;
            color: #e2e8f0;
            padding: 1.4em;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.7;
            margin: 1.6em 0;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
        }
        .article-content code {
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
            background: #f1f5f9;
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 0.92em;
            color: var(--primary-dark);
        }
        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.6em 0;
            font-size: 15px;
        }
        .article-content th,
        .article-content td {
            padding: 12px 16px;
            border: 1px solid var(--border);
            text-align: left;
            color: var(--text-light);
        }
        .article-content th {
            background: #f1f5f9;
            font-weight: 600;
            color: var(--text);
        }
        .article-content tr:nth-child(even) td {
            background: #f8fafc;
        }
        .article-footer {
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .tag-list {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag {
            display: inline-block;
            padding: 5px 14px;
            font-size: 13px;
            border-radius: 999px;
            background: #f1f5f9;
            color: var(--text-light);
            transition: background var(--transition), color var(--transition);
            cursor: default;
        }
        .tag:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .article-back {
            font-size: 14px;
            color: var(--primary);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 999px;
            background: var(--primary-light);
            transition: background var(--transition);
        }
        .article-back:hover {
            background: var(--primary);
            color: #fff;
        }
        .not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .not-found-icon {
            width: 96px;
            height: 96px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 40px;
            color: var(--primary);
            margin: 0 auto 28px;
        }
        .not-found h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .not-found p {
            color: var(--text-light);
            margin-bottom: 32px;
        }
        .article-side {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .side-card {
            background: var(--surface);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 28px;
        }
        .side-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .side-card h3 i {
            color: var(--primary);
            font-size: 16px;
        }
        .side-list li {
            margin-bottom: 4px;
        }
        .side-list a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 10px 0;
            border-bottom: 1px solid #f1f5f9;
            font-size: 14px;
            color: var(--text-light);
            transition: color var(--transition), padding-left var(--transition);
        }
        .side-list a:hover {
            color: var(--primary);
            padding-left: 6px;
        }
        .side-list a::before {
            content: '\f0a9';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            color: var(--primary);
            font-size: 12px;
            margin-top: 4px;
            flex-shrink: 0;
        }
        .side-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-left: auto;
            flex-shrink: 0;
        }
        .side-empty {
            font-size: 14px;
            color: var(--text-muted);
            padding: 12px 0;
        }
        .side-service {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 8px;
        }
        .side-service-item {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            color: var(--text-light);
        }
        .side-service-item i {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            flex-shrink: 0;
        }
        .side-nav-list {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .side-nav-link {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            background: #f8fafc;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-light);
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .side-nav-link:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateX(4px);
        }
        .side-nav-link i {
            color: var(--primary);
            width: 20px;
            text-align: center;
        }
        .related-section {
            background: var(--surface);
            padding: 72px 0;
            border-top: 1px solid var(--border);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .related-card-img {
            height: 160px;
            background: linear-gradient(135deg, var(--primary-light), #e0f2fe);
            position: relative;
        }
        .related-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .related-card-img img {
            transform: scale(1.04);
        }
        .related-card-body {
            padding: 20px;
        }
        .related-card-title {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 8px;
            color: var(--text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .category-cards {
            padding: 80px 0;
            background: var(--bg);
        }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .category-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 32px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: box-shadow var(--transition), transform var(--transition);
            position: relative;
            overflow: hidden;
        }
        .category-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .category-card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 18px;
        }
        .category-card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .category-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 18px;
        }
        .category-card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }
        .category-card-link:hover {
            gap: 10px;
        }
        .faq-section {
            padding: 80px 0;
            background: var(--surface);
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item[open] {
            border-color: var(--primary-light);
            box-shadow: var(--shadow);
        }
        .faq-summary {
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            display: flex;
            align-items: center;
            justify-content: space-between;
            list-style: none;
            transition: color var(--transition);
            user-select: none;
        }
        .faq-summary::-webkit-details-marker {
            display: none;
        }
        .faq-summary:hover {
            color: var(--primary);
        }
        .faq-summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 14px;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item[open] .faq-summary::after {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 22px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.8;
        }
        .cta-section {
            padding: 80px 0;
        }
        .cta-inner {
            background: linear-gradient(135deg, #1e3a8a, #3b82f6);
            border-radius: var(--radius-lg);
            padding: 56px 64px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-inner::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
        }
        .cta-title {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 16px;
            position: relative;
            z-index: 2;
        }
        .cta-desc {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 32px;
            position: relative;
            z-index: 2;
            line-height: 1.8;
        }
        .cta-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            position: relative;
            z-index: 2;
        }
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 18px;
        }
        .footer-brand-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
        }
        .footer-brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
        }
        .footer-desc {
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 24px;
            max-width: 340px;
        }
        .footer-social {
            display: flex;
            gap: 10px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.08);
            color: #94a3b8;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            font-size: 14px;
            color: #94a3b8;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .contact-item {
            font-size: 14px;
            color: #94a3b8;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .contact-item i {
            color: var(--primary);
            width: 20px;
            text-align: center;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            font-size: 14px;
        }
        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom-links a {
            color: #94a3b8;
            transition: color var(--transition);
        }
        .footer-bottom-links a:hover {
            color: #fff;
        }
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 20px rgba(26, 86, 219, 0.4);
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
            z-index: 90;
            border: none;
        }
        .back-top:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px rgba(26, 86, 219, 0.5);
        }
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                padding: 40px 0 60px;
            }
            .article-side {
                display: grid;
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .main-nav {
                display: none;
                width: 100%;
                background: var(--surface);
                border-radius: 16px;
                padding: 12px;
                box-shadow: var(--shadow-lg);
                position: absolute;
                top: calc(var(--header-height) + 8px);
                left: 24px;
                right: 24px;
                flex-direction: column;
                align-items: stretch;
                gap: 6px;
                z-index: 99;
            }
            .main-nav.open {
                display: flex;
            }
            .nav-link {
                padding: 12px 18px;
                border-radius: 10px;
            }
            .nav-link.active {
                background: var(--primary);
            }
            .nav-toggle {
                display: inline-flex;
            }
            .btn-header {
                display: none;
            }
            .page-title {
                font-size: 30px;
            }
            .page-hero {
                padding: 48px 0 40px;
            }
            .article-main {
                margin-left: -24px;
                margin-right: -24px;
                border-radius: 0;
                padding: 32px 20px;
            }
            .article-content {
                font-size: 15px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .category-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cta-inner {
                padding: 40px 24px;
            }
            .cta-title {
                font-size: 24px;
            }
            .cta-desc {
                font-size: 15px;
            }
            .section-title {
                font-size: 26px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom-links {
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .page-title {
                font-size: 24px;
            }
            .page-meta {
                gap: 12px;
                font-size: 13px;
            }
            .article-main {
                margin-left: -16px;
                margin-right: -16px;
                padding: 28px 16px;
            }
            .article-content h2 {
                font-size: 22px;
            }
            .article-content h3 {
                font-size: 18px;
            }
            .article-footer {
                flex-direction: column;
                align-items: flex-start;
            }
            .tag-list {
                gap: 6px;
            }
            .related-card-img {
                height: 140px;
            }
            .related-card-title {
                font-size: 15px;
            }
            .category-card {
                padding: 24px;
            }
            .faq-summary {
                font-size: 15px;
                padding: 18px;
            }
            .faq-answer {
                padding: 0 18px 18px;
                font-size: 14px;
            }
            .cta-buttons .btn {
                width: 100%;
            }
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 38px;
                height: 38px;
            }
        }

/* roulang page: category2 */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --secondary: #0ea5e9;
  --accent: #14b8a6;
  --dark: #0f172a;
  --gray-800: #1e293b;
  --gray-600: #475569;
  --gray-500: #64748b;
  --gray-400: #94a3b8;
  --gray-100: #f1f5f9;
  --gray-50: #f8fafc;
  --white: #ffffff;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-800);
  background: var(--white);
}
body.nav-lock { overflow: hidden; }

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
h1,h2,h3,h4,h5 { font-weight: 700; line-height: 1.3; color: var(--dark); }

.container { width: min(1200px, 92%); margin-inline: auto; }

.section { padding: 90px 0; }
.section--gray { background: var(--gray-50); }
.section--dark { background: var(--dark); }

.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px; border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary); font-size: 13px; font-weight: 600;
  letter-spacing: 0.5px; margin-bottom: 16px;
}
.section-tag i { font-size: 12px; }
.section-title { font-size: clamp(26px, 3.2vw, 36px); letter-spacing: -0.5px; }
.section-sub { color: var(--gray-500); margin-top: 12px; font-size: 16px; line-height: 1.8; }

/* ===== header ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; gap: 20px;
}
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  color: var(--white); font-size: 20px; font-weight: 800;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}
.logo-text { font-size: 20px; font-weight: 800; color: var(--dark); letter-spacing: -0.5px; }

.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; margin-left: 24px; }
.nav-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 999px;
  font-size: 15px; font-weight: 500; color: var(--gray-600);
  transition: all var(--transition);
}
.nav-link i { font-size: 14px; opacity: 0.7; }
.nav-link:hover { color: var(--primary); background: rgba(37, 99, 235, 0.06); }
.nav-link.active { color: var(--primary); background: rgba(37, 99, 235, 0.1); font-weight: 600; }

.nav-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.nav-search {
  display: flex; align-items: center; gap: 8px;
  background: var(--gray-100); border-radius: 999px;
  padding: 8px 16px; width: 200px; transition: all var(--transition);
}
.nav-search i { color: var(--gray-400); font-size: 14px; }
.nav-search input {
  border: none; background: none; outline: none;
  width: 100%; font-size: 14px; color: var(--dark);
}
.nav-search:focus-within { box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15); background: var(--white); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600; line-height: 1;
  transition: all var(--transition); border: 2px solid transparent;
}
.btn-primary { background: var(--primary); color: var(--white); box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35); }
.btn-outline { border-color: var(--border); color: var(--gray-600); background: var(--white); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: rgba(37, 99, 235, 0.04); }
.btn-light { background: var(--white); color: var(--primary); }
.btn-light:hover { background: var(--gray-100); transform: translateY(-2px); }

.nav-toggle {
  display: none; width: 44px; height: 44px; border-radius: 12px;
  align-items: center; justify-content: center;
  color: var(--dark); font-size: 20px;
  background: var(--gray-100);
}

/* ===== hero banner ===== */
.page-hero {
  position: relative; padding: 120px 0 100px;
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 50%, #f0fdfa 100%);
  overflow: hidden;
}
.page-hero-bg {
  position: absolute; inset: 0;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover; background-position: center;
  opacity: 0.15;
}
.page-hero .container { position: relative; z-index: 2; }
.hero-breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--gray-500);
  margin-bottom: 24px;
}
.hero-breadcrumb a { color: var(--primary); }
.hero-breadcrumb i { font-size: 12px; }
.page-hero h1 {
  font-size: clamp(32px, 4.5vw, 52px); letter-spacing: -1px;
  max-width: 620px; line-height: 1.2;
}
.page-hero h1 span { color: var(--primary); }
.page-hero-desc {
  color: var(--gray-600); font-size: 17px; line-height: 1.9;
  max-width: 640px; margin-top: 20px;
}
.hero-actions { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }
.hero-metrics { display: flex; gap: 40px; margin-top: 52px; flex-wrap: wrap; }
.metric-item .metric-num { font-size: 36px; font-weight: 800; color: var(--dark); letter-spacing: -1px; }
.metric-item .metric-num i { color: var(--primary); font-size: 28px; margin-right: 4px; }
.metric-item .metric-label { font-size: 14px; color: var(--gray-500); margin-top: 4px; }

/* ===== cards ===== */
.card-panel {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card-panel:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

/* ===== feature grid ===== */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { padding: 32px 28px; position: relative; overflow: hidden; }
.feature-card::after {
  content: ''; position: absolute; top: 0; right: 0;
  width: 80px; height: 80px; border-radius: 0 0 0 80px;
  background: linear-gradient(135deg, transparent 50%, rgba(37, 99, 235, 0.06) 50%);
}
.feature-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: var(--white); margin-bottom: 20px;
}
.feature-icon.icon-blue { background: linear-gradient(135deg, #2563eb, #60a5fa); }
.feature-icon.icon-cyan { background: linear-gradient(135deg, #0ea5e9, #22d3ee); }
.feature-icon.icon-teal { background: linear-gradient(135deg, #14b8a6, #5eead4); }
.feature-icon.icon-indigo { background: linear-gradient(135deg, #6366f1, #a5b4fc); }
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }
.feature-link { margin-top: 16px; font-size: 14px; color: var(--primary); font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.feature-link i { transition: transform var(--transition); }
.feature-link:hover i { transform: translateX(4px); }

/* ===== process steps ===== */
.process-wrap { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; position: relative; }
.process-wrap::before {
  content: ''; position: absolute; top: 40px; left: 10%; right: 10%;
  height: 2px; background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  opacity: 0.2;
}
.process-step { text-align: center; padding: 0 8px; position: relative; }
.step-num {
  width: 80px; height: 80px; border-radius: 50%;
  background: var(--white); border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-size: 22px; font-weight: 800; color: var(--primary);
  position: relative; z-index: 1; transition: all var(--transition);
}
.process-step:hover .step-num { border-color: var(--primary); background: var(--primary); color: var(--white); box-shadow: 0 8px 24px rgba(37,99,235,0.25); }
.process-step h4 { font-size: 16px; margin-bottom: 8px; }
.process-step p { font-size: 13px; color: var(--gray-500); line-height: 1.6; }

/* ===== checklist / panel ===== */
.split-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.panel-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.panel-image img { width: 100%; height: 100%; object-fit: cover; min-height: 320px; }
.list-check { margin-top: 20px; }
.list-check li { display: flex; gap: 12px; padding: 10px 0; font-size: 15px; color: var(--gray-600); align-items: flex-start; }
.list-check li i { color: var(--accent); margin-top: 4px; flex-shrink: 0; }

/* ===== article cards ===== */
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.article-card { overflow: hidden; display: flex; flex-direction: column; }
.article-img { overflow: hidden; position: relative; aspect-ratio: 16/10; }
.article-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.article-card:hover .article-img img { transform: scale(1.05); }
.article-tag {
  position: absolute; top: 14px; left: 14px;
  background: rgba(15, 23, 42, 0.75); backdrop-filter: blur(8px);
  color: var(--white); font-size: 12px; padding: 4px 12px; border-radius: 999px;
  font-weight: 500;
}
.article-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.article-body h3 { font-size: 17px; margin-bottom: 10px; line-height: 1.5; }
.article-body h3 a { transition: color var(--transition); }
.article-body h3 a:hover { color: var(--primary); }
.article-body p { font-size: 14px; color: var(--gray-500); line-height: 1.7; flex: 1; }
.article-meta { display: flex; gap: 16px; margin-top: 16px; font-size: 13px; color: var(--gray-400); }

/* ===== comparison table ===== */
.table-wrap { overflow-x: auto; border-radius: var(--radius); box-shadow: var(--shadow-sm); border: 1px solid var(--border); background: var(--white); }
.compare-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.compare-table th, .compare-table td { padding: 16px 24px; text-align: left; font-size: 15px; }
.compare-table thead th { background: var(--dark); color: var(--white); font-weight: 600; white-space: nowrap; }
.compare-table thead th:first-child { border-radius: var(--radius) 0 0 0; }
.compare-table thead th:last-child { border-radius: 0 var(--radius) 0 0; }
.compare-table tbody tr { border-top: 1px solid var(--border); transition: background var(--transition); }
.compare-table tbody tr:hover { background: var(--gray-50); }
.compare-table td .fa-check { color: var(--accent); }
.compare-table td .fa-xmark { color: var(--gray-400); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-sm); margin-bottom: 14px;
  transition: all var(--transition); overflow: hidden;
}
.faq-item.open { border-color: var(--primary); box-shadow: 0 4px 20px rgba(37, 99, 235, 0.08); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 22px 28px; font-size: 16px; font-weight: 600; color: var(--dark); text-align: left;
}
.faq-q i { color: var(--primary); font-size: 14px; transition: transform var(--transition); flex-shrink: 0; }
.faq-item.open .faq-q i { transform: rotate(45deg); }
.faq-a { max-height: 0; transition: max-height 0.4s ease; overflow: hidden; }
.faq-a-inner { padding: 0 28px 24px; color: var(--gray-500); font-size: 14px; line-height: 1.9; border-top: 1px solid var(--border); padding-top: 18px; }

/* ===== CTA ===== */
.cta-section {
  padding: 80px 0; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0f172a, #1e3a5f);
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover; background-position: center; opacity: 0.08;
}
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { color: var(--white); font-size: clamp(26px, 3vw, 36px); margin-bottom: 16px; }
.cta-section p { color: rgba(255, 255, 255, 0.7); max-width: 560px; margin: 0 auto 36px; font-size: 16px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===== footer ===== */
.site-footer { background: var(--dark); color: rgba(255, 255, 255, 0.65); padding: 70px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 0.8fr 0.8fr 1.2fr; gap: 48px; padding-bottom: 48px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.footer-brand-icon {
  width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  color: var(--white); font-size: 20px; font-weight: 800;
}
.footer-brand-name { color: var(--white); font-size: 20px; font-weight: 800; }
.footer-desc { font-size: 14px; line-height: 1.9; max-width: 320px; }
.footer-social { display: flex; gap: 10px; margin-top: 22px; }
.footer-social a {
  width: 38px; height: 38px; border-radius: 10px;
  background: rgba(255, 255, 255, 0.08); color: rgba(255, 255, 255, 0.7);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; transition: all var(--transition);
}
.footer-social a:hover { background: var(--primary); color: var(--white); transform: translateY(-3px); }
.footer-title { color: var(--white); font-size: 16px; margin-bottom: 20px; font-weight: 600; }
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 14px; transition: all var(--transition); }
.footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-contact { display: flex; flex-direction: column; gap: 14px; }
.contact-item { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.contact-item i { color: var(--primary-light); width: 18px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 14px;
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a:hover { color: var(--primary-light); }

/* ===== back to top ===== */
.back-top {
  position: fixed; bottom: 40px; right: 40px; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--primary); color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: all var(--transition);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ===== responsive ===== */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .process-wrap { grid-template-columns: repeat(3, 1fr); row-gap: 40px; }
  .process-wrap::before { display: none; }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
  .split-layout { grid-template-columns: 1fr; gap: 32px; }
  .panel-image img { max-height: 340px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .nav-toggle { display: flex; }
  .header-inner { height: 64px; }
  .main-nav {
    position: fixed; top: 64px; left: 0; right: 0;
    background: var(--white); flex-direction: column; align-items: stretch;
    padding: 16px 6vw 24px; border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.1);
    transform: translateY(-110%); opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    margin-left: 0; gap: 4px;
  }
  .main-nav.open { transform: translateY(0); opacity: 1; }
  .nav-link { padding: 14px 16px; font-size: 16px; border-radius: 12px; }
  .nav-right { display: none; }
  .page-hero { padding: 72px 0 60px; }
  .hero-metrics { gap: 24px; }
  .metric-item .metric-num { font-size: 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .back-top { bottom: 24px; right: 24px; }
}

@media (max-width: 520px) {
  .feature-grid { grid-template-columns: 1fr; }
  .process-wrap { grid-template-columns: 1fr 1fr; gap: 24px; }
  .article-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .page-hero h1 { font-size: 28px; }
  .hero-breadcrumb { font-size: 13px; flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* roulang page: category3 */
:root {
  --primary: #1e5eff;
  --primary-dark: #0f3ec2;
  --primary-light: #eaf0ff;
  --accent: #00b578;
  --accent-dark: #008d5e;
  --bg: #f7f9fc;
  --bg-white: #ffffff;
  --bg-soft: #f0f4fa;
  --text: #1a2333;
  --text-body: #3f4b5e;
  --text-weak: #7b8799;
  --border: #e3e9f2;
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 2px 8px rgba(26, 35, 51, 0.06);
  --shadow: 0 8px 28px rgba(26, 35, 51, 0.08);
  --shadow-lg: 0 16px 48px rgba(26, 35, 51, 0.12);
  --spacing-section: 90px;
  --spacing-section-sm: 56px;
  --header-h: 72px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul, ol { list-style: none; }
button, input, select { font-family: inherit; font-size: inherit; }
a:focus-visible, button:focus-visible {
  outline: 3px solid rgba(30, 94, 255, 0.35);
  outline-offset: 2px;
}
.container {
  width: min(1200px, 92%);
  margin-inline: auto;
}
.section {
  padding: var(--spacing-section) 0;
}
.section-alt { background: var(--bg-white); }
.section-soft { background: var(--bg-soft); border-block: 1px solid var(--border); }

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: 100px;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}
.section-tag i { font-size: 15px; }
.section-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.section-title em {
  font-style: normal;
  color: var(--primary);
}
.section-sub {
  margin-top: 14px;
  font-size: 16px;
  color: var(--text-weak);
  line-height: 1.8;
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(227, 233, 242, 0.9);
  height: var(--header-h);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #6c9bff);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(30, 94, 255, 0.3);
}
.brand-name { font-size: 20px; font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-body);
}
.nav-link i { font-size: 14px; opacity: 0.8; }
.nav-link:hover { background: var(--primary-light); color: var(--primary); }
.nav-link.active { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(30, 94, 255, 0.28); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 9px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(0, 181, 120, 0.28);
}
.nav-cta:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0, 181, 120, 0.35); }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  background: var(--bg-white);
  border-radius: 10px;
  font-size: 16px;
  color: var(--text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-dropdown {
  position: relative;
}
.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 20px;
  width: 360px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 999;
}
.nav-dropdown:hover .nav-dropdown-panel,
.nav-dropdown:focus-within .nav-dropdown-panel {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 10px;
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  transition: var(--transition);
}
.dropdown-item:hover { background: var(--primary-light); color: var(--primary); transform: translateY(-1px); }
.dropdown-item i { font-size: 18px; color: var(--primary); }

/* ===== Hero / Page Banner ===== */
.page-hero {
  position: relative;
  padding: 100px 0 110px;
  background: url('/assets/images/backpic/back-2.png') center / cover no-repeat;
  background-attachment: fixed;
  isolation: isolate;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(14, 27, 51, 0.94), rgba(19, 43, 84, 0.82), rgba(30, 94, 255, 0.65));
  z-index: -1;
}
.hero-inner { max-width: 780px; color: #fff; }
.hero-crumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 13px;
  margin-bottom: 22px;
  backdrop-filter: blur(6px);
}
.hero-crumb a:hover { color: #ffd77a; }
.hero-crumb .sep { opacity: 0.6; font-size: 11px; }
.hero-title {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  letter-spacing: -0.01em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}
.hero-title span { color: #ffd77a; }
.hero-desc {
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.88);
  max-width: 640px;
}
.hero-features {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}
.hero-feature {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 100px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 500;
  backdrop-filter: blur(6px);
}
.hero-feature i { color: #ffd77a; font-size: 13px; }
.hero-actions { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 12px;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 20px rgba(30, 94, 255, 0.3); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(30, 94, 255, 0.35); }
.btn-light { background: #fff; color: var(--text); box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(0, 0, 0, 0.16); }
.btn-outline-light { background: transparent; color: #fff; border: 1.5px solid rgba(255, 255, 255, 0.45); }
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.1); border-color: #fff; transform: translateY(-2px); }

/* ===== Download Platforms ===== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.platform-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 26px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.platform-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}
.platform-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.platform-card:hover::after { opacity: 1; }
.platform-icon {
  width: 68px;
  height: 68px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 18px;
  color: #fff;
}
.p-icon-android { background: linear-gradient(135deg, #3ddc84, #148e52); }
.p-icon-apple { background: linear-gradient(135deg, #333, #111); }
.p-icon-windows { background: linear-gradient(135deg, #00a2ff, #0058b5); }
.p-icon-web { background: linear-gradient(135deg, #ff8c38, #f0631c); }
.platform-card h3 { font-size: 18px; color: var(--text); font-weight: 700; }
.platform-card p { font-size: 13px; color: var(--text-weak); margin-top: 8px; line-height: 1.6; }
.platform-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 9px 22px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
}
.platform-card:hover .platform-btn { background: var(--primary); color: #fff; }
.platform-tag {
  position: absolute;
  top: 14px;
  right: -30px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 36px;
  transform: rotate(45deg);
}

/* ===== Feature Download Steps ===== */
.steps-wrapper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step-counter;
}
.step-item {
  position: relative;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px 24px;
  transition: var(--transition);
}
.step-item:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.step-num {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #6c9bff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 10px;
}
.step-item h3 { font-size: 16px; color: var(--text); font-weight: 700; margin-bottom: 8px; }
.step-item p { font-size: 13px; color: var(--text-weak); line-height: 1.7; }

/* ===== Version Log ===== */
.version-list {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.version-item {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-start;
  padding: 28px 32px;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.version-item:last-child { border-bottom: none; }
.version-item:hover { background: var(--bg-soft); }
.version-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 5px 14px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 700;
}
.version-badge.new { background: #f0fff7; color: var(--accent); }
.version-content { flex: 1; min-width: 260px; }
.version-content h3 { font-size: 16px; color: var(--text); font-weight: 600; }
.version-content ul { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.version-content li { font-size: 13px; color: var(--text-body); display: flex; align-items: center; gap: 6px; }
.version-content li i { color: var(--accent); font-size: 11px; }
.version-date {
  font-size: 13px;
  color: var(--text-weak);
  white-space: nowrap;
  padding-top: 4px;
}

/* ===== Security Download Note ===== */
.security-wrap {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  background: linear-gradient(135deg, #101c36 0%, #16294d 50%, #0f3ec2 100%);
  border-radius: var(--radius-lg);
  padding: 56px 56px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.security-wrap::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -60px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(108, 155, 255, 0.25), transparent 70%);
  border-radius: 50%;
}
.security-copy h2 { font-size: 28px; font-weight: 700; line-height: 1.4; }
.security-copy h2 span { color: #ffd77a; }
.security-copy p { margin-top: 14px; font-size: 14px; color: rgba(255, 255, 255, 0.75); line-height: 1.8; }
.security-list { margin-top: 24px; display: grid; gap: 12px; }
.security-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 10px 16px;
  border-radius: 10px;
}
.security-list li i { color: #ffd77a; font-size: 15px; }
.security-visual {
  display: grid;
  gap: 16px;
}
.security-stat {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.security-stat .stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.12);
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffd77a;
}
.security-stat strong { display: block; font-size: 24px; font-weight: 800; }
.security-stat span { font-size: 13px; color: rgba(255, 255, 255, 0.65); }

/* ===== Device Support ===== */
.device-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.device-card {
  display: flex;
  gap: 18px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: var(--transition);
}
.device-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: #c7d6f5; }
.device-icon { flex-shrink: 0; }
.device-icon i {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.device-card h3 { font-size: 16px; color: var(--text); font-weight: 700; }
.device-card p { font-size: 13px; color: var(--text-weak); margin-top: 6px; line-height: 1.7; }
.device-card .sys { display: inline-block; margin-top: 10px; background: var(--bg-soft); color: var(--text-body); padding: 3px 10px; border-radius: 6px; font-size: 12px; font-weight: 500; }

/* ===== FAQ ===== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}
.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: #c7d6f5; box-shadow: var(--shadow-sm); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.faq-question i { font-size: 14px; color: var(--text-weak); transition: transform 0.3s; flex-shrink: 0; margin-left: 12px; }
.faq-item.active .faq-question i { transform: rotate(45deg); color: var(--primary); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-answer p { padding: 0 24px 22px; font-size: 14px; color: var(--text-body); line-height: 1.9; }

/* ===== CTA / Contact ===== */
.cta-block {
  background: linear-gradient(120deg, #f7f9fc, #eaf0ff, #dce6ff);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-block::before {
  content: "";
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(30, 94, 255, 0.16), transparent 70%);
  border-radius: 50%;
}
.cta-block h2 { font-size: 30px; font-weight: 800; color: var(--text); }
.cta-block h2 span { color: var(--primary); }
.cta-block p { margin-top: 12px; font-size: 15px; color: var(--text-weak); }
.cta-actions { display: flex; justify-content: center; gap: 14px; margin-top: 30px; flex-wrap: wrap; position: relative; }
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 34px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}
.cta-btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 20px rgba(30, 94, 255, 0.3); }
.cta-btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 30px rgba(30, 94, 255, 0.4); }
.cta-btn-ghost { background: #fff; color: var(--text); border: 1.5px solid var(--border); }
.cta-btn-ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }

/* ===== Footer ===== */
.site-footer {
  background: #101c36;
  color: #9db2d0;
  padding: 64px 0 24px;
  margin-top: 0;
}
.site-footer .container { max-width: 1200px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 44px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #6c9bff);
  color: #fff;
  font-size: 17px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.footer-brand-name { font-size: 18px; font-weight: 700; color: #fff; }
.footer-desc { font-size: 14px; line-height: 1.9; margin-top: 16px; max-width: 280px; color: #7e91ad; }
.footer-social { display: flex; gap: 10px; margin-top: 18px; }
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.07);
  color: #9db2d0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
}
.footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}
.footer-links { display: grid; gap: 10px; }
.footer-links a { font-size: 14px; color: #7e91ad; position: relative; padding-left: 14px; }
.footer-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #42587a;
  transition: var(--transition);
}
.footer-links a:hover { color: #fff; padding-left: 18px; }
.footer-links a:hover::before { background: var(--primary); }
.footer-contact { display: grid; gap: 12px; }
.contact-item { font-size: 14px; color: #7e91ad; display: flex; align-items: center; gap: 8px; }
.contact-item i { color: #546b8c; font-size: 13px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: #546b8c;
}
.footer-bottom-links { display: flex; gap: 18px; }
.footer-bottom-links a { color: #546b8c; }
.footer-bottom-links a:hover { color: #fff; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root { --spacing-section: 70px; }
  .section-title { font-size: 30px; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-wrapper { grid-template-columns: repeat(2, 1fr); }
  .security-wrap { grid-template-columns: 1fr; padding: 40px; }
  .device-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .page-hero { padding: 80px 0 90px; }
  .hero-title { font-size: 38px; }
}

@media (max-width: 768px) {
  :root { --spacing-section: 56px; --header-h: 62px; }
  .header-inner { gap: 12px; }
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 12px 16px;
    gap: 6px;
    display: none;
    z-index: 999;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .nav-toggle { display: flex; }
  .nav-cta { display: inline-flex; width: 100%; justify-content: center; }
  .nav-dropdown-panel { position: static; transform: none; width: 100%; opacity: 1; visibility: visible; box-shadow: none; border: none; padding: 8px 0 4px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .nav-dropdown:hover .nav-dropdown-panel,
  .nav-dropdown:focus-within .nav-dropdown-panel { transform: none; }
  .page-hero { padding: 60px 0 72px; }
  .hero-title { font-size: 30px; }
  .hero-desc { font-size: 15px; }
  .hero-features { gap: 10px; }
  .section-title { font-size: 26px; }
  .platform-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .entity-card { padding: 22px; }
  .steps-wrapper { grid-template-columns: 1fr; }
  .device-grid { grid-template-columns: 1fr; }
  .security-wrap { padding: 28px; }
  .version-item { padding: 20px; }
  .cta-block { padding: 40px 24px; }
}

@media (max-width: 520px) {
  :root { --spacing-section: 48px; }
  .container { width: 90%; }
  .platform-grid { grid-template-columns: 1fr; }
  .platform-card { padding: 28px 20px; }
  .hero-title { font-size: 26px; }
  .hero-actions .btn { width: 100%; }
  .section-title { font-size: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-bottom-links { justify-content: center; flex-wrap: wrap; gap: 12px; }
  .version-item { flex-direction: column; gap: 8px; }
  .version-date { white-space: normal; }
  .cta-actions { flex-direction: column; }
  .cta-actions .cta-btn { width: 100%; justify-content: center; }
  .security-list li { flex-wrap: wrap; }
}