/* roulang page: index */
:root {
      --primary: #0A1F14;
      --accent: #D4AF37;
      --bg-warm: #F7F5F0;
      --bg-white: #FFFFFF;
      --bg-light-green: #EDF2EF;
      --text-primary: #0A1F14;
      --text-body: #2D3A33;
      --text-muted: #6B7B72;
      --text-on-dark: #F7F5F0;
      --border-light: #D6DDD9;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 16px rgba(10, 31, 20, 0.06);
      --shadow-hover: 0 8px 32px rgba(10, 31, 20, 0.10);
      --transition: 0.3s ease;
      --container-max: 1200px;
      --header-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, .stats-number {
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.3;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: 48px;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
    }
    p {
      max-width: 680px;
      color: var(--text-body);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      border: none;
      outline: none;
    }
    .section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      h3 { font-size: 22px; }
      .section { padding: 70px 0; }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--bg-white);
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      z-index: 100;
      height: var(--header-height);
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo svg {
      height: 32px;
      width: auto;
    }
    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
    }
    .nav-link {
      padding: 6px 16px;
      border-radius: 30px;
      font-weight: 500;
      font-size: 15px;
      color: var(--text-muted);
      transition: var(--transition);
      background: transparent;
    }
    .nav-link:hover {
      color: var(--primary);
      background: rgba(10,31,20,0.04);
    }
    .nav-link.active {
      background: var(--accent);
      color: #0A1F14;
      font-weight: 600;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--primary);
      padding: 8px;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(10,31,20,0.95);
        backdrop-filter: blur(8px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 28px;
        z-index: 200;
        transform: translateX(100%);
        transition: transform 0.4s ease;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
      .mobile-link {
        font-size: 22px;
        color: white;
        font-weight: 600;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #EDF2EF 0%, #FFFFFF 100%);
      padding: 120px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      gap: 40px;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 520px;
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #0A1F14;
      padding: 14px 32px;
      font-size: 17px;
      box-shadow: 0 4px 10px rgba(212,175,55,0.3);
    }
    .btn-primary:hover {
      background: #e6c84b;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
    }
    .btn-outline:hover {
      background: rgba(10,31,20,0.05);
      transform: translateY(-2px);
    }
    .hero-right {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .data-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 18px 20px;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .data-label {
      font-size: 15px;
      color: var(--text-muted);
    }
    .data-value {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 28px;
      color: var(--accent);
    }
    .trust-bar {
      display: flex;
      gap: 30px;
      margin-top: 50px;
      flex-wrap: wrap;
      align-items: center;
    }
    .trust-item {
      background: #eef3f0;
      border-radius: 8px;
      padding: 8px 18px;
      color: var(--text-muted);
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-right {
        margin-top: 30px;
      }
    }
    /* 卡片通用 */
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    @media (max-width: 768px) {
      .grid-2, .grid-3 {
        grid-template-columns: 1fr;
      }
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: rgba(212,175,55,0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
      font-size: 24px;
    }
    /* 功能分组 */
    .feature-row {
      display: flex;
      gap: 50px;
      align-items: center;
      margin-bottom: 80px;
    }
    .feature-text {
      flex: 1;
    }
    .feature-img {
      flex: 1;
      background: #f0f3f1;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    .feature-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .reverse {
      flex-direction: row-reverse;
    }
    @media (max-width: 768px) {
      .feature-row, .reverse {
        flex-direction: column;
      }
    }
    /* 价格卡片 */
    .pricing-card {
      text-align: center;
      border: 2px solid transparent;
    }
    .pricing-card.recommended {
      border-color: var(--accent);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: #0A1F14;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .price {
      font-family: 'Inter', sans-serif;
      font-size: 44px;
      font-weight: 700;
      color: var(--primary);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }
    /* 深色区块 */
    .dark-band {
      background: var(--primary);
      color: var(--text-on-dark);
      text-align: center;
      padding: 80px 0;
    }
    .dark-band h2 {
      color: white;
    }
    .footer {
      background: var(--primary);
      color: #cfd8d3;
      padding: 60px 0 30px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a {
      color: #cfd8d3;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }