/* roulang page: index */
:root {
      --deep-green: #0B3D2E;
      --mid-green: #1A5B3A;
      --accent-orange: #F5A623;
      --accent-orange-hover: #E09515;
      --bg-light: #F8F9F5;
      --white: #FFFFFF;
      --text-dark: #2C3E2E;
      --text-muted: #5A6B5E;
      --border-light: rgba(11, 61, 46, 0.12);
      --shadow-card: 0 4px 12px rgba(11, 61, 46, 0.06);
      --shadow-hover: 0 8px 24px rgba(11, 61, 46, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-mono: 'JetBrains Mono', 'Roboto Mono', monospace;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --spacing-section: 80px;
      --max-width: 1280px;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--deep-green);
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 16px;
      text-align: center;
    }

    .section {
      padding: var(--spacing-section) 0;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      cursor: pointer;
      text-decoration: none;
      border: none;
      padding: 14px 32px;
      font-size: 1rem;
      gap: 8px;
      letter-spacing: 0.3px;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: #0B2A1A;
      box-shadow: 0 4px 10px rgba(245, 166, 35, 0.3);
    }

    .btn-primary:hover {
      background: var(--accent-orange-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(245, 166, 35, 0.4);
      color: #0B2A1A;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-green);
      color: var(--deep-green);
    }

    .btn-outline:hover {
      background: rgba(11, 61, 46, 0.05);
      border-color: var(--mid-green);
    }

    /* 导航 */
    .header {
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(8px);
      background: rgba(255, 255, 255, 0.92);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 16px 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--deep-green);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .logo span {
      color: var(--accent-orange);
      font-weight: 700;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--text-dark);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--accent-orange);
    }

    .nav-cta {
      background: var(--deep-green);
      color: white !important;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
    }

    .nav-cta:hover {
      background: var(--mid-green) !important;
      color: white !important;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-green);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B3D2E 0%, #0A2F20 100%);
      color: white;
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: repeating-linear-gradient(0deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 20px), repeating-linear-gradient(90deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 20px);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }

    .data-badge {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: inline-block;
      margin-bottom: 32px;
      border: 1px solid rgba(255,255,255,0.15);
    }

    .live-indicator {
      display: flex;
      align-items: center;
      gap: 8px;
      color: #F5A623;
      font-weight: 600;
    }

    .hero-cards {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .float-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px solid rgba(245,166,35,0.3);
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .mono-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-orange);
      animation: pulse-opacity 1.8s infinite;
    }

    @keyframes pulse-opacity {
      0% { opacity: 0.9; }
      50% { opacity: 1; }
      100% { opacity: 0.9; }
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 32px;
    }

    .stat-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      border-top: 4px solid var(--deep-green);
      transition: all 0.3s;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .stat-value {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      color: var(--accent-orange);
      font-weight: 700;
    }

    /* 服务卡片 不对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1.2fr;
      gap: 28px;
      margin-top: 32px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
      border-bottom: 4px solid var(--accent-orange);
    }

    .service-icon {
      font-size: 2rem;
      color: var(--accent-orange);
      margin-bottom: 16px;
    }

    /* 对比表格 */
    .comparison-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .col-left {
      background: #f0f2ec;
      padding: 32px;
    }

    .col-right {
      background: var(--deep-green);
      color: white;
      padding: 32px;
    }

    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 16px 0;
      border-bottom: 1px solid rgba(0,0,0,0.08);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--accent-orange);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* 表单 */
    .contact-form {
      background: white;
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }

    .input-field {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid #dce1db;
      border-radius: 6px;
      margin-bottom: 16px;
      font-family: inherit;
    }

    .input-field:focus {
      outline: none;
      border-color: var(--deep-green);
      box-shadow: 0 0 0 3px rgba(11,61,46,0.1);
    }

    .footer {
      background: var(--deep-green);
      color: rgba(255,255,255,0.9);
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .services-grid {
        grid-template-columns: 1fr 1fr;
      }
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--deep-green);
        padding: 24px;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .comparison-table {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.5rem;
      }
    }