/* roulang page: index */
:root {
      --primary: #0B3D2E;
      --primary-deep: #0A2E24;
      --accent: #F5A623;
      --accent-light: #FEE9C2;
      --bg: #F7F9F8;
      --white: #FFFFFF;
      --gray-100: #F1F4F3;
      --gray-200: #E2E8E5;
      --gray-600: #5C6B66;
      --gray-800: #1F2E28;
      --text: #1F2E28;
      --text-light: #5C6B66;
      --radius-card: 20px;
      --radius-btn: 40px;
      --radius-tag: 30px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
      --transition: 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .top-nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: box-shadow 0.3s;
    }
    .top-nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1.1rem;
    }
    .desktop-links {
      display: flex;
      gap: 2.5rem;
      font-weight: 500;
      color: var(--text-light);
    }
    .desktop-links a {
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .desktop-links a:hover,
    .desktop-links a.active {
      color: var(--primary);
    }
    .desktop-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent);
      border-radius: 3px;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0B3D2E 0%, #0A2E24 100%);
      padding: 80px 0 100px;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-content {
      flex: 1;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.85rem;
      color: var(--accent-light);
      margin-bottom: 24px;
      border: 1px solid rgba(255,255,255,0.15);
    }
    h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.5rem;
      max-width: 540px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: 0.25s ease;
      box-shadow: 0 8px 18px rgba(245,166,35,0.25);
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      filter: brightness(1.08);
      box-shadow: 0 12px 26px rgba(245,166,35,0.35);
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      height: 340px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      position: relative;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,61,46,0.2), transparent);
      border-radius: 28px;
    }

    /* 区块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-light);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 指标看板 */
    #metrics {
      background: var(--primary-deep);
      color: white;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .metric-card {
      background: rgba(255,255,255,0.07);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .metric-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .metric-label {
      font-size: 0.9rem;
      opacity: 0.8;
      margin-top: 12px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 68px;
      height: 68px;
      background: #E9F3EF;
      border-radius: 24px;
      margin: 0 auto 24px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .tags {
      display: flex;
      gap: 10px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 18px;
    }
    .tag {
      border: 1px solid var(--accent);
      color: var(--primary);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }

    /* 对比区 */
    .comparison-wrapper {
      display: flex;
      gap: 24px;
      align-items: stretch;
    }
    .compare-col {
      flex:1;
      border-radius: 28px;
      padding: 36px 28px;
    }
    .compare-left {
      background: #F2F5F4;
      border: 1px solid #E0E6E3;
    }
    .compare-right {
      background: var(--white);
      border: 2px solid var(--primary);
      box-shadow: 0 10px 30px rgba(11,61,46,0.08);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 20px 0;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 14px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 5px solid var(--primary);
    }
    .faq-answer {
      padding: 0 28px 24px;
      color: var(--text-light);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-card {
      background: white;
      border-radius: 32px;
      padding: 48px;
      box-shadow: var(--shadow-card);
      max-width: 700px;
      margin: 0 auto;
    }
    .input-field {
      width: 100%;
      padding: 16px;
      border: 1px solid #D0D9D5;
      border-radius: 16px;
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .trust-line {
      margin-top: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-light);
    }

    /* Footer */
    footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .comparison-wrapper { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .desktop-links { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.92);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px 16px;
        border-top: 1px solid #e0e6e3;
        z-index: 100;
      }
      .mobile-bottom-nav a {
        font-size: 0.7rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--text-light);
      }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 2.2rem; }
      .services-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr; }
      .cta-card { padding: 28px; }
    }