/* roulang page: index */
:root {
    --primary: #1E3C57;
    --primary-dark: #14293E;
    --accent-green: #2E9E63;
    --accent-gold: #E8A33D;
    --bg: #F7F8FA;
    --surface: #FFFFFF;
    --border: #E4EAF0;
    --text-main: #152C3F;
    --text-secondary: #5B6B7C;
    --text-light: #9AA8B5;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 2px 8px rgba(30, 60, 87, 0.06);
    --shadow-md: 0 8px 24px rgba(30, 60, 87, 0.12);
    --header-height: 68px;
    --container: 1200px;
    --section-space: 96px;
    --section-space-mobile: 56px;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    color: var(--text-main);
    background: var(--bg);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
  }

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

  a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
  }

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

  input,
  textarea {
    font-family: inherit;
    font-size: 15px;
    outline: none;
  }

  .container {
    max-width: var(--container);
    margin: 0 auto;
    padding-left: 16px;
    padding-right: 16px;
  }

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

  @media (max-width: 768px) {
    .section {
      padding: var(--section-space-mobile) 0;
    }
  }

  /* Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: #fff;
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: box-shadow 0.3s ease;
  }

  .site-header.scrolled {
    box-shadow: 0 4px 20px rgba(15, 34, 51, 0.08);
  }

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

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

  .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-green);
    color: #fff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 20px;
    letter-spacing: -0.5px;
    box-shadow: 0 2px 8px rgba(46, 158, 99, 0.3);
  }

  .logo-text {
    font-size: 19px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
    white-space: nowrap;
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .nav-link {
    padding: 10px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-main);
    border-radius: 8px;
    position: relative;
    transition: color 0.2s, background 0.2s;
  }

  .nav-link:hover {
    color: var(--primary);
    background: #F0F4F8;
  }

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

  .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--accent-gold);
    border-radius: 2px 2px 0 0;
  }

  .btn-cta {
    background: var(--accent-gold);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 14px;
    padding: 10px 22px;
    border-radius: 8px;
    white-space: nowrap;
    transition: background 0.2s, transform 0.15s;
    box-shadow: 0 2px 8px rgba(232, 163, 61, 0.3);
  }

  .btn-cta:hover {
    background: #D4902C;
    transform: translateY(-1px);
  }

  .btn-cta:active {
    transform: translateY(0);
  }

  .hamburger {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 8px;
    border: 1px solid var(--border);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background: #fff;
    transition: background 0.2s;
  }

  .hamburger:hover {
    background: #F0F4F8;
  }

  .hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
  }

  .hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .hamburger.open span:nth-child(2) {
    opacity: 0;
  }
  .hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Mobile menu */
  .mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(15, 34, 51, 0.1);
    padding: 12px 16px 20px;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }

  .mobile-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .mobile-menu .mobile-nav-link {
    display: block;
    min-height: 48px;
    line-height: 48px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-main);
    border-bottom: 1px solid #F0F3F6;
    padding: 0 12px;
  }

  .mobile-menu .mobile-nav-link:last-child {
    border-bottom: none;
  }

  .mobile-menu .mobile-nav-link.active {
    color: var(--primary);
    font-weight: 700;
  }

  /* Hero */
  .hero {
    background: linear-gradient(120deg, #14293E 0%, #1E3C57 100%);
    position: relative;
    padding: calc(var(--header-height) + 72px) 0 0;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 28px 28px;
    pointer-events: none;
  }

  .hero::after {
    content: '';
    position: absolute;
    right: -80px;
    top: 20%;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    border: 1px solid rgba(232, 163, 61, 0.2);
    pointer-events: none;
  }

  .hero-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
    padding-bottom: 56px;
  }

  .hero-pill {
    display: inline-block;
    background: rgba(46, 158, 99, 0.2);
    color: #7ED6A5;
    font-size: 13px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 999px;
    letter-spacing: 0.3px;
    margin-bottom: 20px;
    border: 1px solid rgba(46, 158, 99, 0.3);
  }

  .hero h1 {
    font-size: 42px;
    font-weight: 800;
    color: #fff;
    line-height: 1.25;
    letter-spacing: 1px;
    margin-bottom: 16px;
  }

  .hero-sub {
    color: #B8C9D8;
    font-size: 16px;
    line-height: 1.7;
    max-width: 480px;
    margin-bottom: 32px;
  }

  .hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.2s ease;
  }

  .btn-gold {
    background: var(--accent-gold);
    color: var(--primary-dark);
    box-shadow: 0 4px 16px rgba(232, 163, 61, 0.35);
  }

  .btn-gold:hover {
    background: #D4902C;
    transform: translateY(-1px);
  }

  .btn-gold:active {
    transform: translateY(0);
  }

  .btn-outline {
    background: transparent;
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.5);
  }

  .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
  }

  .hero-media {
    position: relative;
  }

  .hero-img {
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    height: 320px;
    object-fit: cover;
  }

  .hero-card-float {
    position: absolute;
    right: -16px;
    bottom: -20px;
    background: var(--accent-green);
    color: #fff;
    border-radius: 14px;
    padding: 16px 22px;
    box-shadow: 0 8px 24px rgba(46, 158, 99, 0.4);
    text-align: center;
    min-width: 120px;
  }

  .hero-card-num {
    display: block;
    font-size: 32px;
    font-weight: 800;
    line-height: 1.2;
  }

  .hero-card-label {
    font-size: 13px;
    opacity: 0.9;
  }

  .hero-stats {
    position: relative;
    z-index: 2;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px);
    border-radius: 16px 16px 0 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    padding: 28px 24px;
    gap: 16px;
  }

  .stat-item {
    text-align: center;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0 12px;
  }
  .stat-item:last-child {
    border-right: none;
  }

  .stat-num {
    display: block;
    font-size: 30px;
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    font-variant-numeric: tabular-nums;
  }

  .stat-label {
    font-size: 13px;
    color: #9FB6C9;
    margin-top: 2px;
  }

  @media (max-width: 768px) {
    .hero-inner {
      grid-template-columns: 1fr;
      gap: 40px;
      padding-bottom: 40px;
    }
    .hero h1 {
      font-size: 32px;
    }
    .hero-sub {
      font-size: 15px;
    }
    .hero-stats {
      grid-template-columns: repeat(2, 1fr);
      padding: 20px 16px;
      border-radius: 16px;
    }
    .stat-item {
      border-right: none;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding-bottom: 12px;
    }
    .stat-item:nth-child(odd) {
      border-right: 1px solid rgba(255, 255, 255, 0.08);
    }
    .stat-item:nth-child(3),
    .stat-item:nth-child(4) {
      border-bottom: none;
      padding-bottom: 0;
    }
    .stat-num {
      font-size: 26px;
    }
    .hero-card-float {
      right: 8px;
      bottom: -16px;
      padding: 12px 16px;
      min-width: 90px;
    }
    .hero-card-num {
      font-size: 24px;
    }
  }

  /* Section head */
  .section-head {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 44px;
    flex-wrap: wrap;
  }

  .section-pill {
    display: inline-flex;
    align-items: center;
    background: rgba(46, 158, 99, 0.1);
    color: var(--accent-green);
    font-size: 13px;
    font-weight: 700;
    padding: 5px 14px;
    border-radius: 999px;
    letter-spacing: 0.4px;
  }

  .section-head h2 {
    font-size: 30px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.3;
    letter-spacing: 0.3px;
    margin-right: auto;
  }

  .section-more {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
  }

  .section-more:hover {
    border-color: var(--primary);
  }

  @media (max-width: 768px) {
    .section-head {
      margin-bottom: 28px;
      gap: 10px;
    }
    .section-head h2 {
      font-size: 24px;
      flex-basis: 100%;
      order: 3;
      margin-right: 0;
    }
  }

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

  .service-card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 32px;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
  }

  .service-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .service-card-lg {
    grid-column: span 2;
    background: linear-gradient(135deg, #F5F9FC 0%, #EDF5F1 100%);
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow: hidden;
  }

  .service-card-lg .service-img {
    width: 100%;
    height: 100%;
    min-height: 240px;
    object-fit: cover;
  }

  .service-lg-content {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .service-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: rgba(46, 158, 99, 0.1);
    margin-bottom: 16px;
  }

  .service-card:nth-child(3) .service-icon {
    background: rgba(30, 60, 87, 0.1);
  }

  .service-card h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-main);
    line-height: 1.4;
  }

  .service-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 16px;
    flex-grow: 1;
  }

  .service-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-green);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s, color 0.2s;
  }

  .service-link:hover {
    gap: 8px;
    color: #238C52;
  }

  @media (max-width: 1024px) {
    .services-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .service-card-lg {
      grid-column: span 2;
    }
  }

  @media (max-width: 768px) {
    .services-grid {
      grid-template-columns: 1fr;
    }
    .service-card-lg {
      grid-column: span 1;
      grid-template-columns: 1fr;
    }
    .service-card-lg .service-img {
      height: 200px;
      min-height: 0;
    }
  }

  /* Stats section */
  .section-stats {
    background: linear-gradient(180deg, var(--bg) 0%, #EEF2F5 100%);
  }

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

  .stats-col {
    text-align: center;
    padding: 32px 16px;
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
  }

  .stats-col:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .stats-circle {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(46, 158, 99, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 16px;
  }

  .stats-number {
    display: block;
    font-size: 42px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
    letter-spacing: -1px;
  }

  .stats-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
    display: block;
  }

  @media (max-width: 1024px) {
    .stats-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (max-width: 768px) {
    .stats-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .stats-col {
      padding: 24px 12px;
    }
    .stats-number {
      font-size: 32px;
    }
  }

  /* Cases */
  .cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .case-card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
  }

  .case-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .case-img {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
  }

  .case-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
  }

  .case-card:hover .case-img img {
    transform: scale(1.05);
  }

  .case-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(20, 41, 62, 0);
    transition: background 0.3s ease;
  }

  .case-card:hover .case-img::after {
    background: rgba(20, 41, 62, 0.2);
  }

  .case-body {
    padding: 28px;
  }

  .case-tag {
    display: inline-block;
    background: rgba(46, 158, 99, 0.1);
    color: var(--accent-green);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 12px;
  }

  .case-body h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 10px;
    line-height: 1.4;
  }

  .case-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 16px;
  }

  .case-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
  }

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

  @media (max-width: 768px) {
    .cases-grid {
      grid-template-columns: 1fr;
      gap: 20px;
    }
    .case-body {
      padding: 20px;
    }
  }

  /* Solutions */
  .solution-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    margin-bottom: 72px;
  }

  .solution-row:last-child {
    margin-bottom: 0;
  }

  .solution-row.reverse {
    direction: rtl;
  }
  .solution-row.reverse > * {
    direction: ltr;
  }

  .solution-tag {
    display: inline-block;
    background: rgba(30, 60, 87, 0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 999px;
    margin-bottom: 14px;
  }

  .solution-text h3 {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.35;
    margin-bottom: 20px;
  }

  .solution-text ul {
    list-style: none;
  }

  .solution-text ul li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 12px;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
  }

  .solution-text ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(46, 158, 99, 0.15);
  }

  .solution-text ul li::after {
    content: '✓';
    position: absolute;
    left: 0;
    top: 4px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: var(--accent-green);
    font-weight: 700;
  }

  .solution-img {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
  }

  .solution-img img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: var(--radius);
  }

  @media (max-width: 768px) {
    .solution-row {
      grid-template-columns: 1fr;
      gap: 28px;
      margin-bottom: 48px;
    }
    .solution-row.reverse {
      direction: ltr;
    }
    .solution-text h3 {
      font-size: 24px;
    }
    .solution-img img {
      height: 220px;
    }
  }

  /* FAQ */
  .faq-list {
    max-width: 768px;
    margin: 0 auto;
  }

  .faq-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 12px;
    transition: background 0.25s, border-color 0.25s;
    overflow: hidden;
  }

  .faq-item.active {
    background: #F2F6F9;
    border-left: 3px solid var(--accent-green);
  }

  .faq-question {
    width: 100%;
    text-align: left;
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: transparent;
    transition: color 0.2s;
  }

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

  .faq-icon {
    font-size: 22px;
    font-weight: 300;
    color: var(--accent-green);
    flex-shrink: 0;
    transition: transform 0.3s ease;
    line-height: 1;
  }

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

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    background: transparent;
  }

  .faq-item.active .faq-answer {
    max-height: 300px;
  }

  .faq-answer p {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
  }

  /* CTA */
  .cta-section {
    position: relative;
    background: linear-gradient(120deg, #14293E 0%, #1E3C57 100%);
    padding: 72px 0;
    text-align: center;
    overflow: hidden;
  }

  .cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
  }

  .cta-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--accent-green);
  }

  .cta-content {
    position: relative;
    z-index: 2;
  }

  .cta-content h2 {
    font-size: 30px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 28px;
    letter-spacing: 0.5px;
  }

  .cta-content .btn-gold {
    font-size: 16px;
    padding: 14px 36px;
  }

  .cta-phone {
    margin-top: 20px;
    font-size: 14px;
    color: #9FB6C9;
  }

  @media (max-width: 768px) {
    .cta-section {
      padding: 48px 0;
    }
    .cta-content h2 {
      font-size: 24px;
    }
  }

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

  .news-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform 0.2s, box-shadow 0.2s;
  }

  .news-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .news-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
  }

  .news-date {
    font-size: 13px;
    color: var(--text-light);
  }

  .news-tag {
    display: inline-block;
    background: rgba(46, 158, 99, 0.1);
    color: var(--accent-green);
    font-size: 11px;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 999px;
  }

  .news-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.45;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 52px;
  }

  .news-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
    flex-grow: 1;
  }

  .news-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-green);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s;
  }

  .news-link:hover {
    gap: 8px;
    color: #238C52;
  }

  .empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 24px;
    border: 2px dashed var(--border);
    border-radius: 16px;
    background: #FBFCFD;
  }

  .empty-icon {
    font-size: 40px;
    display: block;
    margin-bottom: 12px;
  }

  .empty-state p {
    color: var(--text-light);
    font-size: 15px;
  }

  @media (max-width: 1024px) {
    .news-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (max-width: 768px) {
    .news-grid {
      grid-template-columns: 1fr;
      gap: 16px;
    }
    .news-card {
      padding: 20px;
    }
  }

  /* Contact */
  .contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 48px;
    box-shadow: var(--shadow-sm);
  }

  .contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
  }

  .contact-item:last-child {
    margin-bottom: 0;
  }

  .contact-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(46, 158, 99, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
  }

  .contact-item strong {
    display: block;
    font-size: 15px;
    color: var(--text-main);
    margin-bottom: 2px;
  }

  .contact-item p {
    font-size: 14px;
    color: var(--text-secondary);
  }

  .contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .form-input,
  .form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    color: var(--text-main);
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .form-input:focus,
  .form-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 60, 87, 0.1);
  }

  .form-textarea {
    min-height: 120px;
    resize: vertical;
  }

  .btn-submit {
    align-self: flex-start;
    padding: 13px 36px;
    font-weight: 600;
  }

  @media (max-width: 768px) {
    .contact-grid {
      grid-template-columns: 1fr;
      padding: 24px;
      gap: 32px;
    }
    .form-row {
      grid-template-columns: 1fr;
    }
  }

  /* Footer */
  .site-footer {
    background: #0F2233;
    color: #B8C9D8;
    padding-top: 56px;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
  }

  .footer-logo {
    display: block;
    font-size: 20px;
    font-weight: 800;
    color: #fff;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
  }

  .footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: #8CA3B8;
    max-width: 320px;
    margin-bottom: 20px;
  }

  .social-icons {
    display: flex;
    gap: 12px;
  }

  .social-icons span {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #B8C9D8;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
  }

  .social-icons span:hover {
    background: var(--accent-green);
    color: #fff;
  }

  .footer-links h4,
  .footer-contact h4 {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
  }

  .footer-links a {
    display: block;
    font-size: 14px;
    color: #8CA3B8;
    padding: 5px 0;
    transition: color 0.2s;
  }

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

  .footer-contact p {
    font-size: 14px;
    color: #8CA3B8;
    padding: 4px 0;
  }

  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px 16px;
    text-align: center;
    font-size: 13px;
    color: #6D879C;
  }

  @media (max-width: 768px) {
    .footer-grid {
      grid-template-columns: 1fr;
      gap: 32px;
      padding-bottom: 24px;
    }
  }

  /* Responsive header */
  @media (max-width: 1024px) {
    .main-nav {
      display: none;
    }
    .hamburger {
      display: flex;
    }
    .btn-cta {
      margin-left: auto;
    }
    .logo-text {
      font-size: 17px;
    }
  }

  @media (max-width: 480px) {
    .logo-text {
      font-size: 16px;
    }
    .btn-cta {
      display: none;
    }
    .header-inner {
      gap: 8px;
    }
  }

/* roulang page: category1 */
:root {
            --primary: #1E3C57;
            --primary-dark: #14293E;
            --accent-green: #2E9E63;
            --accent-gold: #E8A33D;
            --bg: #F7F8FA;
            --surface: #FFFFFF;
            --border: #E4EAF0;
            --text-main: #152C3F;
            --text-secondary: #5B6B7C;
            --text-light: #9AA8B5;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            font-family: inherit;
            border: none;
            cursor: pointer;
            background: none;
        }
        input,
        textarea {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 16px;
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 68px;
            background: #fff;
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: box-shadow .3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 8px 28px rgba(30, 60, 87, .1);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 16px;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--accent-green);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 17px;
            letter-spacing: 0;
        }
        .brand-text {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: .3px;
            white-space: nowrap;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            margin: 0 auto;
        }
        .nav-link {
            padding: 8px 15px;
            font-size: 15px;
            color: var(--text-main);
            font-weight: 500;
            border-radius: 6px;
            position: relative;
            transition: color .2s ease, background .2s ease;
        }
        .nav-link:hover {
            color: var(--accent-green);
            background: rgba(46, 158, 99, .05);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 15px;
            right: 15px;
            height: 2px;
            background: var(--accent-gold);
            border-radius: 2px;
        }
        .btn-cta {
            background: var(--accent-gold);
            color: var(--primary-dark);
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 14px;
            transition: background .2s ease, transform .2s ease;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .btn-cta:hover {
            background: #D4902C;
        }
        .btn-cta:active {
            transform: translateY(1px);
        }
        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 8px;
            border: 1px solid var(--border);
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--text-main);
            line-height: 1;
            flex-shrink: 0;
        }

        /* ===== Buttons ===== */
        .btn-gold {
            display: inline-block;
            background: var(--accent-gold);
            color: var(--primary-dark);
            padding: 13px 34px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            transition: background .2s ease, transform .2s ease;
            text-align: center;
        }
        .btn-gold:hover {
            background: #D4902C;
        }
        .btn-gold:active {
            transform: translateY(1px);
        }
        .btn-outline-light {
            display: inline-block;
            border: 1px solid rgba(255, 255, 255, .55);
            color: #fff;
            padding: 13px 34px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            transition: background .2s ease, border-color .2s ease;
            text-align: center;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, .1);
            border-color: #fff;
        }

        /* ===== Pills / Tags ===== */
        .pill {
            display: inline-block;
            background: rgba(46, 158, 99, .12);
            color: var(--accent-green);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 16px;
            border-radius: 999px;
            letter-spacing: .5px;
        }
        .pill-light {
            display: inline-block;
            background: rgba(46, 158, 99, .18);
            color: #8FE0B3;
            font-size: 13px;
            font-weight: 600;
            padding: 5px 16px;
            border-radius: 999px;
            letter-spacing: .5px;
        }
        .tag {
            display: inline-block;
            background: rgba(46, 158, 99, .1);
            color: var(--accent-green);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 13px;
            border-radius: 999px;
            letter-spacing: .3px;
        }

        /* ===== Sections ===== */
        .section {
            padding: 96px 0;
        }
        .section-head {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-head .pill {
            margin-bottom: 12px;
        }
        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            letter-spacing: .3px;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .section-head p {
            color: var(--text-secondary);
            font-size: 15px;
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ===== Category Hero ===== */
        .cat-hero {
            background: linear-gradient(120deg, #14293E 0%, #1E3C57 100%);
            padding: 148px 0 84px;
            position: relative;
            overflow: hidden;
        }
        .cat-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 520px;
            height: 520px;
            background: radial-gradient(circle, rgba(46, 158, 99, .13) 0%, transparent 70%);
            border-radius: 50%;
        }
        .cat-hero::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: -80px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(232, 163, 61, .08) 0%, transparent 70%);
            border-radius: 50%;
        }
        .cat-hero-inner {
            display: flex;
            align-items: center;
            gap: 60px;
            position: relative;
            z-index: 2;
        }
        .cat-hero-text {
            flex: 1;
        }
        .cat-hero-text h1 {
            font-size: 40px;
            color: #fff;
            font-weight: 700;
            margin: 16px 0 10px;
            letter-spacing: .5px;
        }
        .cat-hero-text p {
            color: rgba(255, 255, 255, .75);
            font-size: 16px;
            max-width: 480px;
            line-height: 1.75;
            margin-bottom: 30px;
        }
        .cat-hero-btns {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cat-hero-img {
            flex: 0 0 400px;
            height: 290px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 20px 50px rgba(0, 0, 0, .35);
            border: 1px solid rgba(255, 255, 255, .08);
        }
        .cat-hero-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Stats strip */
        .stat-strip {
            background: rgba(0, 0, 0, .25);
            backdrop-filter: blur(2px);
            border-radius: 16px;
            margin-top: 64px;
            padding: 32px 40px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
            position: relative;
            z-index: 2;
            border: 1px solid rgba(255, 255, 255, .06);
        }
        .stat-item .stat-num {
            font-size: 42px;
            font-weight: 700;
            color: #fff;
            font-variant-numeric: tabular-nums;
            line-height: 1.1;
        }
        .stat-item .stat-label {
            color: rgba(255, 255, 255, .55);
            font-size: 14px;
            margin-top: 4px;
        }

        /* ===== Content Cards (2 col) ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .content-card {
            background: var(--surface);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: 0 2px 8px rgba(30, 60, 87, .06);
            transition: box-shadow .3s ease, transform .3s ease;
            display: flex;
            flex-direction: column;
        }
        .content-card:hover {
            box-shadow: 0 8px 24px rgba(30, 60, 87, .12);
            transform: translateY(-2px);
        }
        .card-img {
            height: 220px;
            overflow: hidden;
            position: relative;
        }
        .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .content-card:hover .card-img img {
            transform: scale(1.05);
        }
        .card-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .card-body .tag {
            margin-bottom: 12px;
            align-self: flex-start;
        }
        .card-body h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .card-body p {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent-green);
            font-weight: 600;
            font-size: 14px;
            transition: gap .25s ease, color .2s ease;
        }
        .card-link:hover {
            gap: 11px;
            color: var(--primary);
        }

        /* ===== Features 4 col ===== */
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 36px 24px 28px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(30, 60, 87, .04);
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .feature-item:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(30, 60, 87, .1);
        }
        .feature-icon {
            width: 54px;
            height: 54px;
            border-radius: 14px;
            background: rgba(46, 158, 99, .1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 24px;
        }
        .feature-item:nth-child(2) .feature-icon {
            background: rgba(30, 60, 87, .08);
        }
        .feature-item:nth-child(3) .feature-icon {
            background: rgba(232, 163, 61, .12);
        }
        .feature-item:nth-child(4) .feature-icon {
            background: rgba(46, 158, 99, .08);
        }
        .feature-item h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .feature-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ===== Scenarios ===== */
        .scenario-section {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .grid-4-sm {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .scenario-card {
            background: var(--bg);
            border-radius: 12px;
            padding: 30px 24px;
            border: 1px solid var(--border);
            transition: border-color .3s ease, background .3s ease, transform .3s ease;
        }
        .scenario-card:hover {
            border-color: var(--accent-green);
            background: rgba(46, 158, 99, .04);
            transform: translateY(-2px);
        }
        .scenario-card .icon-circle {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--accent-green);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            margin-bottom: 16px;
            box-shadow: 0 4px 12px rgba(46, 158, 99, .25);
        }
        .scenario-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-main);
        }
        .scenario-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Process ===== */
        .process-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: stepCounter;
        }
        .process-step {
            background: var(--surface);
            border-radius: 12px;
            border: 1px solid var(--border);
            padding: 32px 24px 26px;
            box-shadow: 0 2px 6px rgba(30, 60, 87, .04);
            position: relative;
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .process-step:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 24px rgba(30, 60, 87, .1);
        }
        .process-step::before {
            counter-increment: stepCounter;
            content: "0" counter(stepCounter);
            font-size: 38px;
            font-weight: 800;
            color: rgba(30, 60, 87, .1);
            line-height: 1;
            display: block;
            margin-bottom: 14px;
            letter-spacing: 1px;
        }
        .process-step h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .process-step p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg);
        }
        .faq-list {
            max-width: 768px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 12px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: box-shadow .3s ease, border-color .3s ease;
        }
        .faq-item.active {
            background: #F2F6F9;
            border-left: 3px solid var(--accent-green);
            box-shadow: 0 4px 16px rgba(30, 60, 87, .06);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            width: 100%;
            text-align: left;
            gap: 16px;
        }
        .faq-icon {
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: rgba(46, 158, 99, .12);
            color: var(--accent-green);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
            transition: transform .35s ease, background .3s ease;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: rgba(46, 158, 99, .2);
        }
        .faq-answer {
            padding: 0 24px 22px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
            animation: fadeIn .3s ease;
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(-4px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(120deg, #14293E 0%, #1E3C57 100%);
            padding: 84px 0;
            text-align: center;
            position: relative;
        }
        .cta-section::after {
            content: '';
            display: block;
            height: 6px;
            background: var(--accent-green);
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
        }
        .cta-section h2 {
            font-size: 28px;
            color: #fff;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: .3px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, .7);
            font-size: 15px;
            margin-bottom: 30px;
        }
        .cta-section .btn-gold {
            font-size: 16px;
            padding: 15px 44px;
            box-shadow: 0 8px 24px rgba(232, 163, 61, .3);
        }
        .cta-contact {
            margin-top: 20px;
            color: rgba(255, 255, 255, .45);
            font-size: 13px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0F2233;
            color: rgba(255, 255, 255, .7);
            padding-top: 64px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.4fr;
            gap: 48px;
            padding-bottom: 48px;
        }
        .footer-logo {
            display: inline-block;
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: .3px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, .5);
            margin-bottom: 20px;
            max-width: 320px;
        }
        .social-icons {
            display: flex;
            gap: 12px;
        }
        .social-icons span {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, .2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: rgba(255, 255, 255, .6);
            transition: background .3s ease, color .3s ease;
            cursor: pointer;
        }
        .social-icons span:hover {
            background: var(--accent-green);
            color: #fff;
        }
        .footer-links h4,
        .footer-contact h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
        }
        .footer-links a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, .5);
            padding: 6px 0;
            transition: color .2s ease, padding-left .2s ease;
        }
        .footer-links a:hover {
            color: var(--accent-gold);
            padding-left: 4px;
        }
        .footer-contact p {
            font-size: 14px;
            color: rgba(255, 255, 255, .5);
            padding: 6px 0;
            line-height: 1.6;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            padding: 20px 0;
        }
        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, .35);
            text-align: center;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .cat-hero-img {
                flex-basis: 320px;
                height: 250px;
            }
            .grid-4,
            .grid-4-sm {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-list {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .btn-cta {
                display: none;
            }
            .main-nav.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--border);
                padding: 16px 20px;
                box-shadow: 0 16px 32px rgba(30, 60, 87, .12);
                gap: 4px;
                margin: 0;
            }
            .main-nav.open .nav-link {
                min-height: 48px;
                display: flex;
                align-items: center;
                font-size: 16px;
                border-radius: 8px;
                padding: 0 16px;
                width: 100%;
            }
            .main-nav.open .nav-link.active {
                background: rgba(46, 158, 99, .06);
            }
            .main-nav.open .nav-link.active::after {
                bottom: auto;
                left: 0;
                top: 50%;
                transform: translateY(-50%);
                height: 20px;
                width: 3px;
                right: auto;
                border-radius: 3px;
            }
            .section {
                padding: 56px 0;
            }
            .cat-hero {
                padding: 110px 0 56px;
            }
            .cat-hero-inner {
                flex-direction: column;
                gap: 32px;
            }
            .cat-hero-img {
                flex: none;
                width: 100%;
                height: 200px;
            }
            .cat-hero-text h1 {
                font-size: 32px;
            }
            .stat-strip {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
                margin-top: 40px;
                padding: 24px 20px;
            }
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .section-head h2 {
                font-size: 24px;
            }
            .section-head {
                margin-bottom: 40px;
            }
        }

        @media (max-width: 520px) {
            .grid-4,
            .grid-4-sm {
                grid-template-columns: 1fr;
            }
            .process-list {
                grid-template-columns: 1fr;
            }
            .stat-strip {
                grid-template-columns: repeat(2, 1fr);
            }
            .cat-hero-btns {
                flex-direction: column;
            }
            .cat-hero-btns .btn-gold,
            .cat-hero-btns .btn-outline-light {
                width: 100%;
            }
            .brand-text {
                font-size: 15px;
            }
            .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }
            .cat-hero-text h1 {
                font-size: 28px;
            }
            .cta-section h2 {
                font-size: 22px;
            }
        }

/* roulang page: article */
:root {
      --primary: #1E3C57;
      --primary-dark: #14293E;
      --accent-green: #2E9E63;
      --green-light: rgba(46, 158, 99, 0.12);
      --accent-gold: #E8A33D;
      --gold-dark: #D4902C;
      --bg: #F7F8FA;
      --surface: #FFFFFF;
      --border: #E4EAF0;
      --text-main: #152C3F;
      --text-secondary: #5B6B7C;
      --text-light: #9AA8B5;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 2px 8px rgba(30, 60, 87, 0.06);
      --shadow-md: 0 8px 24px rgba(30, 60, 87, 0.12);
      --header-h: 68px;
      --space-section: 96px;
      --space-section-mobile: 56px;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      color: var(--text-main);
      background: var(--bg);
      font-size: 16px;
      line-height: 1.7;
      padding-top: var(--header-h);
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: color 0.3s ease; }
    img { max-width: 100%; display: block; }
    button { font-family: inherit; cursor: pointer; border: none; background: none; }
    input, select, textarea { font-family: inherit; }
    h1, h2, h3, h4, h5, h6 { font-weight: 700; letter-spacing: 0.3px; line-height: 1.3; }
    ul, ol { list-style-position: outside; }
    ::selection { background: rgba(46, 158, 99, 0.2); }
    a:focus-visible, button:focus-visible {
      outline: 2px solid var(--accent-gold);
      outline-offset: 2px;
      border-radius: 4px;
    }

    .container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      font-size: 15px; font-weight: 600; padding: 12px 24px;
      border-radius: var(--radius-btn); border: 1px solid transparent;
      transition: all 0.3s ease; line-height: 1.5;
    }
    .btn-gold { background: var(--accent-gold); color: var(--primary-dark); }
    .btn-gold:hover { background: var(--gold-dark); }
    .btn-gold:active { transform: translateY(1px); }
    .btn-outline { border-color: rgba(255, 255, 255, 0.6); color: #fff; }
    .btn-outline:hover { background: rgba(255, 255, 255, 0.12); border-color: #fff; }
    .btn-primary { background: var(--primary); color: #fff; }
    .btn-primary:hover { background: var(--primary-dark); }

    .pill {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 6px 16px; background: var(--green-light); color: var(--accent-green);
      font-size: 13px; font-weight: 600; border-radius: 999px;
    }
    .badge {
      display: inline-block; padding: 4px 12px; background: rgba(232, 163, 61, 0.2);
      color: var(--accent-gold); font-size: 13px; font-weight: 600; border-radius: 999px;
    }

    .site-header {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      height: var(--header-h); background: var(--surface);
      border-bottom: 1px solid var(--border);
      transition: box-shadow 0.3s ease;
    }
    .site-header.scrolled { box-shadow: 0 8px 24px rgba(30, 60, 87, 0.08); }
    .header-inner {
      display: flex; align-items: center; justify-content: space-between;
      height: 100%;
    }
    .brand-logo {
      display: flex; align-items: center; gap: 10px;
      font-size: 20px; font-weight: 700; color: var(--primary);
      white-space: nowrap;
    }
    .brand-logo:hover { opacity: 0.85; }
    .logo-mark {
      width: 34px; height: 34px; background: var(--accent-green);
      border-radius: 8px; display: flex; align-items: center; justify-content: center;
      color: #fff; font-size: 16px; font-weight: 800;
      box-shadow: 0 2px 6px rgba(46, 158, 99, 0.3);
    }
    .main-nav { display: flex; align-items: center; gap: 4px; }
    .main-nav .nav-link {
      display: inline-flex; align-items: center; padding: 8px 14px;
      font-size: 15px; color: var(--text-secondary); border-radius: 8px;
      position: relative; transition: all 0.3s ease;
    }
    .main-nav .nav-link:hover { color: var(--primary); background: rgba(30, 60, 87, 0.04); }
    .main-nav .nav-link.active { color: var(--primary); font-weight: 600; }
    .main-nav .nav-link.active::after {
      content: ''; position: absolute; left: 14px; right: 14px; bottom: 2px;
      height: 2px; background: var(--accent-gold); border-radius: 2px;
    }
    .header-actions { display: flex; align-items: center; gap: 12px; }
    .header-cta { padding: 9px 20px; font-size: 14px; }
    .menu-toggle {
      display: none; width: 40px; height: 40px; align-items: center; justify-content: center;
      border-radius: 8px; border: 1px solid var(--border); background: #fff;
      color: var(--primary); font-size: 18px;
    }

    .article-header-band {
      background: linear-gradient(120deg, var(--primary-dark), var(--primary));
      padding: 72px 0 88px; color: #fff; position: relative; overflow: hidden;
    }
    .article-header-band::before {
      content: ''; position: absolute; inset: 0;
      background-image: radial-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px);
      background-size: 26px 26px;
    }
    .breadcrumb {
      display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
      font-size: 14px; color: rgba(255, 255, 255, 0.65);
      margin-bottom: 24px; position: relative; z-index: 1;
    }
    .breadcrumb a { color: rgba(255, 255, 255, 0.85); }
    .breadcrumb a:hover { color: var(--accent-gold); }
    .breadcrumb .sep { color: rgba(255, 255, 255, 0.4); }
    .breadcrumb .current { color: #fff; font-weight: 500; }
    .article-title {
      font-size: 32px; font-weight: 700; line-height: 1.35; margin-bottom: 18px;
      position: relative; z-index: 1; max-width: 900px;
    }
    .article-meta {
      display: flex; flex-wrap: wrap; align-items: center; gap: 18px;
      font-size: 14px; color: rgba(255, 255, 255, 0.72); position: relative; z-index: 1;
    }
    .article-meta i { margin-right: 6px; color: var(--accent-gold); }

    .article-cover { margin-top: -48px; position: relative; z-index: 5; }
    .article-cover .cover-inner {
      background: var(--surface); border-radius: var(--radius-card);
      overflow: hidden; box-shadow: var(--shadow-md);
    }
    .article-cover .cover-inner img { width: 100%; height: 360px; object-fit: cover; }

    .article-main { padding: 48px 0 80px; background: var(--bg); }
    .article-body {
      max-width: 768px; margin: 0 auto; background: var(--surface);
      border-radius: var(--radius-card); padding: 48px 56px;
      box-shadow: var(--shadow-sm);
    }
    .article-body h2 {
      font-size: 24px; margin: 40px 0 16px; padding-bottom: 12px;
      border-bottom: 2px solid var(--border); color: var(--primary);
    }
    .article-body h3 { font-size: 19px; margin: 32px 0 12px; color: var(--primary); }
    .article-body p { margin-bottom: 20px; font-size: 16px; color: var(--text-secondary); line-height: 1.8; }
    .article-body img { border-radius: 12px; margin: 24px 0; box-shadow: var(--shadow-sm); }
    .article-body blockquote {
      margin: 24px 0; padding: 16px 20px; background: #F4F7F9;
      border-left: 4px solid var(--accent-green); border-radius: 0 8px 8px 0;
      color: var(--text-secondary);
    }
    .article-body ul,
    .article-body ol { margin: 20px 0 20px 8px; padding-left: 24px; color: var(--text-secondary); }
    .article-body li { margin-bottom: 10px; }
    .article-body li::marker { color: var(--accent-green); }
    .article-body strong { color: var(--primary); font-weight: 600; }
    .article-body a { color: var(--accent-green); text-decoration: underline; text-underline-offset: 3px; }
    .article-body a:hover { color: var(--primary); }
    .article-body pre {
      background: #F4F7F9; padding: 16px 20px; border-radius: 8px;
      overflow-x: auto; margin-bottom: 20px; font-size: 14px;
      font-family: 'SFMono-Regular', Consolas, monospace;
    }
    .article-body code { font-family: 'SFMono-Regular', Consolas, monospace; font-size: 14px; }

    .not-found { text-align: center; padding: 60px 24px; }
    .not-found h2 { font-size: 24px; color: var(--primary); margin-bottom: 16px; }
    .not-found p { color: var(--text-secondary); margin-bottom: 24px; }

    .related-section { padding: 80px 0 96px; background: var(--surface); }
    .back-bar { margin-bottom: 40px; }
    .back-link {
      display: inline-flex; align-items: center; gap: 8px; font-size: 15px;
      color: var(--text-secondary); font-weight: 500; transition: color 0.3s ease;
    }
    .back-link:hover { color: var(--accent-green); }
    .section-head { display: flex; align-items: center; gap: 12px; margin-bottom: 40px; }
    .section-head h2 { font-size: 28px; color: var(--primary); }
    .related-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .related-card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: var(--radius-card); overflow: hidden;
      box-shadow: var(--shadow-sm); transition: all 0.35s ease;
    }
    .related-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
    .related-card img { width: 100%; height: 180px; object-fit: cover; transition: transform 0.4s ease; }
    .related-card:hover img { transform: scale(1.03); }
    .related-body { padding: 20px; }
    .related-body h3 {
      font-size: 17px; margin-bottom: 10px; color: var(--text-main);
      display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
      overflow: hidden; transition: color 0.3s ease;
    }
    .related-card:hover .related-body h3 { color: var(--primary); }
    .related-date { font-size: 13px; color: var(--text-light); }
    .related-date i { margin-right: 4px; }

    .cta-banner {
      background: var(--primary-dark); padding: 80px 0; position: relative;
      color: #fff; text-align: center;
    }
    .cta-banner::after {
      content: ''; position: absolute; left: 0; right: 0; bottom: 0;
      height: 6px; background: var(--accent-green);
    }
    .cta-banner h2 { font-size: 28px; margin-bottom: 12px; }
    .cta-banner p { color: rgba(255, 255, 255, 0.7); margin-bottom: 32px; }
    .cta-contact { display: block; margin-top: 24px; font-size: 13px; color: rgba(255, 255, 255, 0.55); }

    .site-footer { background: #0F2233; color: rgba(255, 255, 255, 0.75); }
    .footer-grid {
      display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px;
      padding: 64px 0 40px;
    }
    .footer-brand .footer-logo { font-size: 20px; font-weight: 700; color: #fff; }
    .footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 16px; max-width: 360px; }
    .social-icons { display: flex; gap: 10px; margin-top: 20px; }
    .social-icons span {
      width: 36px; height: 36px; border-radius: 8px; background: rgba(255, 255, 255, 0.1);
      display: flex; align-items: center; justify-content: center; font-size: 14px;
      color: rgba(255, 255, 255, 0.8); transition: background 0.3s ease;
    }
    .social-icons span:hover { background: var(--accent-green); }
    .footer-links h4, .footer-contact h4 { color: #fff; font-size: 16px; margin-bottom: 20px; }
    .footer-links a {
      display: block; font-size: 14px; color: rgba(255, 255, 255, 0.6);
      margin-bottom: 12px; transition: color 0.3s ease;
    }
    .footer-links a:hover { color: var(--accent-gold); }
    .footer-contact p { font-size: 14px; color: rgba(255, 255, 255, 0.6); margin-bottom: 12px; }
    .footer-contact i { margin-right: 8px; color: var(--accent-gold); }
    .footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 20px 0; }
    .footer-bottom .container { display: flex; justify-content: space-between; align-items: center; }
    .footer-bottom p { font-size: 13px; color: rgba(255, 255, 255, 0.4); }

    .sr-only {
      position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
      overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
    }

    @media (max-width: 1024px) {
      .related-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    }
    @media (max-width: 768px) {
      .menu-toggle { display: flex; }
      .header-cta { display: none; }
      .main-nav {
        display: none; position: absolute; top: var(--header-h); left: 0; right: 0;
        background: #fff; border-bottom: 1px solid var(--border);
        box-shadow: 0 12px 24px rgba(30, 60, 87, 0.1);
        flex-direction: column; align-items: stretch; padding: 16px; gap: 4px;
      }
      .main-nav.open { display: flex; }
      .main-nav .nav-link { padding: 14px 16px; font-size: 16px; border-radius: 8px; }
      .main-nav .nav-link.active::after { display: none; }
      .main-nav .nav-link.active { background: rgba(30, 60, 87, 0.05); color: var(--primary); }
      .article-header-band { padding: 56px 0 88px; }
      .article-title { font-size: 26px; }
      .article-meta { gap: 12px; font-size: 13px; }
      .article-cover .cover-inner img { height: 220px; }
      .article-main { padding: 32px 0 56px; }
      .article-body { padding: 28px 20px; }
      .related-section { padding: 56px 0 64px; }
      .section-head h2 { font-size: 24px; }
      .related-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 48px 0 32px; }
      .footer-bottom .container { flex-direction: column; gap: 8px; text-align: center; }
    }
    @media (max-width: 520px) {
      .brand-logo { font-size: 17px; }
      .logo-mark { width: 30px; height: 30px; font-size: 14px; }
      .article-title { font-size: 23px; }
      .cta-banner h2 { font-size: 22px; }
      .btn { padding: 10px 18px; font-size: 14px; }
    }