/* roulang page: index */
:root {
      --primary: #1B3A5C;
      --primary-hover: #2D5A8C;
      --accent: #C9A96E;
      --accent-hover: #A8884A;
      --deep-green: #2D6A4F;
      --bg-warm: #F8F6F2;
      --white: #FFFFFF;
      --text-main: #1A202C;
      --text-secondary: #4A5568;
      --text-muted: #718096;
      --border-warm: #E2DCD3;
      --footer-bg: #1A202C;
      --footer-text: #CBD5E0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --shadow-sm: 0 2px 12px rgba(27, 58, 92, 0.06);
      --shadow-md: 0 8px 24px rgba(27, 58, 92, 0.12);
      --font-heading: 'Crimson Text', 'Noto Serif SC', serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary);
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      letter-spacing: -0.3px;
      color: var(--text-main);
      margin-bottom: 1.5rem;
    }
    h3 {
      font-size: 24px;
      line-height: 1.4;
      font-weight: 600;
    }
    h4 {
      font-size: 18px;
      line-height: 1.5;
      font-weight: 500;
    }
    p, .desc {
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-secondary);
      font-weight: 400;
    }
    .text-small {
      font-size: 14px;
      line-height: 1.6;
      color: var(--text-muted);
    }
    a {
      color: var(--accent);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent-hover);
      text-decoration: underline;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-family: var(--font-body);
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      text-decoration: none;
      font-size: 16px;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      border-color: var(--primary-hover);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--primary);
      border-color: var(--accent);
    }
    .btn-accent:hover {
      background-color: white;
      color: var(--primary);
    }
    .text-link {
      color: var(--accent);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border-bottom: 1px solid currentColor;
      transition: var(--transition);
    }
    .text-link:hover {
      color: var(--accent-hover);
      border-bottom-color: transparent;
      text-decoration: none;
    }
    .pill {
      padding: 4px 12px;
      background: #F8F6F2;
      color: var(--accent);
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      display: inline-block;
    }
    .card {
      background: var(--white);
      border: 1px solid var(--border-warm);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .divider {
      width: 40px;
      height: 4px;
      background-color: var(--accent);
      margin: 0 0 20px 0;
    }
    .decorative-line {
      width: 4px;
      height: 40px;
      background-color: var(--accent);
      display: inline-block;
      margin-right: 16px;
      vertical-align: middle;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid var(--border-warm);
    }
    .nav-row-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }
    .logo i {
      color: var(--accent);
      font-size: 28px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .phone-btn {
      background: var(--primary);
      color: white;
      padding: 8px 18px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .nav-row-bottom {
      border-top: 1px solid var(--border-warm);
      padding: 8px 0;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .nav-row-bottom::-webkit-scrollbar {
      display: none;
    }
    .nav-tabs {
      display: flex;
      gap: 8px;
      padding: 4px 0;
    }
    .nav-tab {
      padding: 8px 20px;
      border-radius: var(--radius-pill);
      color: var(--text-secondary);
      font-weight: 500;
      text-decoration: none;
      transition: var(--transition);
      background: transparent;
    }
    .nav-tab:hover {
      background: #F8F6F2;
      color: var(--primary);
    }
    .nav-tab.active {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
    }
    /* Hero */
    .hero {
      padding: 160px 0 80px;
      background: linear-gradient(180deg, #F8F6F2 0%, #FFFFFF 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.08);
      width: 100%;
      height: auto;
    }
    /* 区块 */
    section {
      padding: 80px 0;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2-1 {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      background: #F8F6F2;
      border-radius: var(--radius-card);
      padding: 40px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-heading);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      position: relative;
    }
    .step-item {
      text-align: center;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--accent);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      margin: 0 auto 16px;
      transition: var(--transition);
    }
    .step-circle:hover {
      background: var(--primary);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-warm);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 500;
      font-size: 18px;
    }
    .faq-answer {
      padding: 16px 0 0 32px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .cta-block {
      background: var(--primary);
      border-radius: 24px;
      padding: 60px;
      text-align: center;
      color: white;
    }
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .grid-4, .stats-row { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-2-1 { grid-template-columns: 1fr 1fr; }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-row-bottom { display: none; }
      .nav-row-bottom.mobile-open {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        border-top: 1px solid var(--border-warm);
      }
      .nav-tabs { flex-direction: column; padding: 16px; }
      .hero-grid { grid-template-columns: 1fr; }
      h1 { font-size: 36px; }
      h2 { font-size: 30px; }
      .grid-4, .grid-3, .grid-2-1, .stats-row, .steps-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .card { padding: 24px; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .btn { width: 100%; justify-content: center; }
      .stats-row { padding: 24px; }
    }