/* roulang page: index */
:root {
      --primary: #0B3B2F;
      --primary-light: #124D3E;
      --accent: #00E5A1;
      --accent-soft: rgba(0,229,161,0.1);
      --bg: #F7F6F2;
      --white: #FFFFFF;
      --text: #1E1E1E;
      --text-secondary: #5C5C5C;
      --border: #D9DFD8;
      --success: #00C48C;
      --alert: #FF6B5B;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Mono", "Menlo", monospace;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --shadow-card: 0 2px 12px rgba(11,59,47,0.06);
      --shadow-hover: 0 8px 28px rgba(11,59,47,0.10);
      --nav-height: 64px;
      --nav-height-mobile: 56px;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, border-color 0.2s ease;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--white);
      border-bottom: 1px solid var(--border);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: box-shadow 0.25s ease;
    }
    .site-header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.05);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><polygon points="12,2 22,8 18,20 6,20 2,8"/></svg>') center/contain no-repeat;
      background: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text);
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: all 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }
    .hamburger span {
      display: block;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: var(--primary);
      box-shadow: -4px 0 20px rgba(0,0,0,0.15);
      z-index: 200;
      display: flex;
      flex-direction: column;
      padding: 2rem;
      transition: right 0.3s ease;
    }
    .mobile-drawer.open {
      right: 0;
    }
    .drawer-close {
      align-self: flex-end;
      background: transparent;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }
    .drawer-links {
      list-style: none;
      margin-top: 2rem;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    .drawer-links a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .site-header { height: var(--nav-height-mobile); }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-subtitle {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3rem auto;
      font-size: 1.1rem;
    }
    /* Hero */
    .hero {
      padding-top: calc(var(--nav-height) + 40px);
      display: flex;
      align-items: center;
      background: var(--bg);
    }
    .hero-grid {
      display: flex;
      gap: 3rem;
      align-items: center;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text);
      margin-bottom: 1.2rem;
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.25s;
    }
    .btn-primary:hover {
      background: var(--primary-light);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.25s;
    }
    .btn-outline:hover {
      background: var(--accent-soft);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 2rem;
      }
    }
    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-left: 4px solid var(--accent);
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 4px;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.25s ease;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }
    .service-card h3 {
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比案例 */
    .compare-row {
      display: flex;
      gap: 2rem;
    }
    .compare-col {
      flex: 1;
      background: var(--white);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .compare-col.recommend {
      border: 1px solid var(--accent);
      position: relative;
    }
    .badge {
      position: absolute;
      top: -12px;
      right: 16px;
      background: var(--alert);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      margin-bottom: 4px;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      padding: 18px 0;
      font-weight: 600;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-left: 12px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .cta-form {
      display: flex;
      gap: 1rem;
      max-width: 700px;
      margin: 2rem auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input, .cta-form textarea {
      padding: 12px 16px;
      border-radius: var(--radius-btn);
      border: 1px solid transparent;
      background: white;
      flex: 1 1 200px;
    }
    .trust-badges {
      display: flex;
      gap: 2rem;
      justify-content: center;
      margin-top: 1.5rem;
      color: rgba(255,255,255,0.8);
    }
    /* 页脚 */
    .footer {
      background: #072E25;
      color: #ccc;
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }
    .footer-bottom {
      margin-top: 2rem;
      text-align: center;
      font-size: 0.85rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }