/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #0B3B2F;
      --primary-soft: rgba(11, 59, 47, 0.08);
      --accent: #D97A2B;
      --accent-deep: #C46A1F;
      --bg: #E5E9EC;
      --text: #4A4A4A;
      --heading: #1A1A1A;
      --muted: #7A7A7A;
      --card-bg: #FFFFFF;
      --border: #E8ECF0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -6px rgba(0,0,0,0.05);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-heading: 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', sans-serif;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: var(--transition-smooth);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 767px) {
      .container {
        padding: 0 20px;
      }
    }
    h1, h2, h3 {
      font-family: var(--font-heading);
      color: var(--heading);
      font-weight: 700;
    }
    h1 { font-size: 48px; line-height: 1.2; letter-spacing: -0.5px; }
    h2 { font-size: 36px; line-height: 1.3; }
    h3 { font-size: 22px; line-height: 1.4; }
    @media (max-width: 767px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      h3 { font-size: 20px; }
    }
    .section {
      padding: 120px 0;
    }
    @media (max-width: 767px) {
      .section {
        padding: 80px 0;
      }
    }
    .text-accent { color: var(--accent); }
    .text-muted { color: var(--muted); }
    .bg-primary { background-color: var(--primary); }
    .bg-dark { background-color: #0A2A22; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      border: none;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #fff;
    }
    .btn-primary:hover {
      background-color: var(--accent-deep);
      box-shadow: 0 0 20px rgba(217,122,43,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-soft);
    }
    @media (max-width: 767px) {
      .btn {
        width: 100%;
        min-height: 48px;
      }
    }
    /* Header */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #fff;
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 1000;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo span {
      position: relative;
    }
    .logo span::before {
      content: '';
      display: inline-block;
      width: 18px;
      height: 2px;
      background: var(--accent);
      transform: rotate(-45deg);
      margin-right: 8px;
      position: relative;
      top: -4px;
    }
    nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    nav a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 4px 0;
    }
    nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 1.5px;
      background: var(--accent);
      transform: scaleX(0);
      transition: transform 0.25s ease;
    }
    nav a:hover {
      color: var(--accent);
    }
    nav a:hover::after {
      transform: scaleX(1);
    }
    .header-cta {
      display: inline-flex;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.25s;
    }
    .hamburger span.short {
      width: 16px;
    }
    @media (max-width: 1023px) {
      nav { display: none; }
      .header-cta { display: none; }
      .hamburger { display: flex; }
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      transform: translateY(-100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      color: #fff;
      font-size: 20px;
      font-weight: 500;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 32px;
      font-size: 28px;
      color: #fff;
      cursor: pointer;
    }
    /* Hero */
    #hero {
      height: 100vh;
      min-height: 700px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(11,59,47,0.6) 0%, rgba(0,0,0,0.85) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero-content h1 {
      color: #fff;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 20px;
      color: #E5E9EC;
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 40px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      color: #fff;
      opacity: 0.7;
    }
    .scroll-line {
      width: 1px;
      height: 32px;
      background: #fff;
    }
    .scroll-arrow {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0%, 100% { opacity: 0.5; }
      50% { opacity: 1; }
    }
    /* Features */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    @media (max-width: 1023px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 767px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border);
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-color: var(--accent);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      color: var(--accent);
      margin-bottom: 24px;
    }
    /* Services */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 1023px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 767px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border);
      transition: 0.3s ease;
    }
    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: var(--accent);
    }
    /* Stats */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 500;
      color: var(--accent);
    }
    @media (max-width: 767px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* Cases */
    .case-row {
      display: flex;
      align-items: center;
      gap: 64px;
      margin-bottom: 80px;
    }
    .case-row.reverse {
      flex-direction: row-reverse;
    }
    .case-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: 0.3s ease;
    }
    .case-img:hover {
      transform: scale(1.02);
    }
    .case-text {
      flex: 1;
    }
    @media (max-width: 767px) {
      .case-row, .case-row.reverse {
        flex-direction: column;
      }
    }
    /* Solutions */
    .steps {
      display: flex;
      flex-direction: column;
      gap: 40px;
    }
    .step-item {
      display: flex;
      gap: 24px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      border-left: 4px solid var(--accent);
    }
    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      border: 1px solid var(--border);
      overflow: hidden;
    }
    .faq-question {
      padding: 16px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #fff;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #F7F9FA;
    }
    .faq-answer p {
      padding: 16px 24px;
    }
    .faq-icon {
      transition: transform 0.35s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    /* CTA */
    #cta {
      background: linear-gradient(180deg, var(--primary) 0%, #000 100%);
    }
    /* Footer */
    footer {
      background: var(--primary);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 12px;
      color: #7A7A7A;
    }
    .reveal {
      opacity: 0;
      transform: translateY(20px);
      transition: 0.6s ease-out;
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }