/* roulang page: index */
:root {
      --primary: #C45A3C;
      --primary-dark: #A84A32;
      --secondary-dark: #3E2C1F;
      --accent: #E8A94E;
      --bg-warm: #FBF7F2;
      --white: #FFFFFF;
      --border-soft: #E8DDD0;
      --text-body: #2C241E;
      --text-muted: #7A6E63;
      --shadow-card: 0 2px 12px rgba(62,44,31,0.06);
      --shadow-hover: 0 8px 28px rgba(196,90,60,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-data: 'Inter', 'SF Mono', 'monospace', sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-heading);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    
    h1, h2, h3 {
      font-family: var(--font-heading);
      font-weight: 700;
    }
    
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    
    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
      margin-bottom: 20px;
    }
    
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    
    button, .btn {
      cursor: pointer;
      border: none;
      outline: none;
      font-family: var(--font-heading);
      transition: all 0.25s ease;
    }
    
    .btn-primary {
      background-color: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: 2px solid var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    
    .btn-primary:hover {
      background-color: var(--primary-dark);
      border-color: var(--primary-dark);
      box-shadow: var(--shadow-hover);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: 2px solid var(--primary);
    }
    
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }
    
    .text-link {
      color: var(--accent);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: color 0.25s, text-decoration 0.25s;
    }
    
    .text-link:hover {
      color: var(--primary);
      text-decoration: underline;
      text-decoration-color: var(--primary);
    }
    
    section {
      padding: 100px 0;
    }
    
    /* HEADER */
    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: white;
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      height: 72px;
    }
    
    .nav-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }
    
    .logo {
      font-weight: 800;
      font-size: 24px;
      letter-spacing: 2px;
      color: var(--primary);
      white-space: nowrap;
    }
    
    .desktop-nav {
      display: flex;
      gap: 36px;
      align-items: center;
      font-weight: 500;
      color: var(--text-body);
    }
    
    .desktop-nav a:hover {
      color: var(--primary);
    }
    
    .hamburger {
      display: none;
      background: none;
      font-size: 28px;
      color: var(--secondary-dark);
    }
    
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--primary);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      z-index: 200;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.35s ease;
    }
    
    .mobile-menu.active {
      opacity: 1;
      pointer-events: auto;
      display: flex;
    }
    
    .mobile-menu a {
      color: white;
      font-size: 24px;
      font-weight: 600;
    }
    
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      color: white;
      font-size: 36px;
    }
    
    /* HERO */
    #hero {
      background-color: var(--bg-warm);
      background-image: radial-gradient(circle at 90% 80%, rgba(196,90,60,0.04), transparent 50%);
      position: relative;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      align-items: center;
      gap: 48px;
    }
    
    .hero-text h1 {
      color: var(--secondary-dark);
      margin-bottom: 18px;
    }
    
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 28px;
      max-width: 480px;
    }
    
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    
    .hero-image {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: linear-gradient(135deg, rgba(196,90,60,0.1) 0%, rgba(232,169,78,0.15) 100%);
    }
    
    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    
    /* METRICS */
    #metrics {
      background: rgba(196,90,60,0.04);
      text-align: center;
      border-radius: 24px;
      margin: 0 40px;
    }
    
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .metric-item {
      padding: 32px 20px;
    }
    
    .metric-number {
      font-family: var(--font-data);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }
    
    .metric-label {
      color: var(--text-muted);
      margin-top: 8px;
      font-size: 16px;
      border-top: 1px solid var(--border-soft);
      padding-top: 16px;
      max-width: 200px;
      margin-left: auto;
      margin-right: auto;
    }
    
    /* SERVICES */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 36px;
    }
    
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 28px;
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    
    .service-icon {
      color: var(--accent);
      font-size: 40px;
      margin-bottom: 24px;
    }
    
    .service-card h3 {
      margin-bottom: 12px;
    }
    
    .service-card p {
      color: var(--text-muted);
      margin-bottom: 20px;
      flex: 1;
    }
    
    .card-image {
      width: 100%;
      border-radius: var(--radius-card);
      margin-bottom: 20px;
      height: 140px;
      object-fit: cover;
    }
    
    /* COMPARE TABLE */
    .table-wrapper {
      overflow-x: auto;
      border-radius: 16px;
      box-shadow: var(--shadow-card);
    }
    
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      background: white;
      min-width: 600px;
    }
    
    .comparison-table th {
      background-color: var(--primary);
      color: white;
      padding: 18px;
      font-weight: 600;
      text-align: left;
    }
    
    .comparison-table td {
      padding: 16px 18px;
      border-bottom: 1px solid var(--border-soft);
      color: var(--text-body);
    }
    
    .comparison-table tr:nth-child(even) td {
      background: rgba(251,247,242,0.6);
    }
    
    .highlight {
      color: var(--accent);
      font-weight: 700;
    }
    
    .check-mark {
      color: var(--accent);
      margin-right: 8px;
      font-weight: bold;
    }
    
    .table-cta {
      text-align: center;
      margin-top: 24px;
    }
    
    /* FAQ */
    #faq {
      background: var(--bg-warm);
    }
    
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-soft);
      overflow: hidden;
    }
    
    .faq-question {
      background: none;
      border: none;
      padding: 20px 28px;
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      color: var(--secondary-dark);
      text-align: left;
      cursor: pointer;
    }
    
    .faq-icon {
      color: var(--accent);
      font-size: 24px;
      transition: transform 0.2s;
    }
    
    .faq-answer {
      padding: 0 28px 20px;
      color: var(--text-muted);
      display: none;
    }
    
    .faq-item.open .faq-answer {
      display: block;
    }
    
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    
    /* CONTACT */
    .contact-grid {
      display: grid;
      grid-template-columns: 6fr 6fr;
      gap: 40px;
      background: white;
      border-radius: 24px;
      padding: 48px;
      box-shadow: var(--shadow-card);
    }
    
    .contact-form input,
    .contact-form textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-soft);
      border-radius: 8px;
      margin-bottom: 18px;
      font-family: inherit;
      background: var(--bg-warm);
    }
    
    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: var(--primary);
      outline: none;
    }
    
    .info-card {
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 24px;
      color: var(--text-muted);
    }
    
    .info-item {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    
    .info-item i {
      color: var(--primary);
      font-size: 24px;
    }
    
    /* FOOTER */
    footer {
      background: var(--secondary-dark);
      color: rgba(255,255,255,0.75);
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
    }
    
    .footer-col h4 {
      color: white;
      margin-bottom: 18px;
    }
    
    .footer-col a, .footer-col p {
      color: rgba(255,255,255,0.65);
      margin-bottom: 8px;
      display: block;
    }
    
    .copyright {
      border-top: 1px solid #5C4A3A;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: rgba(255,255,255,0.5);
    }
    
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .contact-grid { grid-template-columns: 1fr; }
    }
    
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .desktop-nav { display: none; }
      .hamburger { display: block; }
      h1 { font-size: 36px; }
      h2 { font-size: 30px; }
      .metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 70px 0; }
    }