/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #134B61;
      --secondary: #0F766E;
      --secondary-dark: #0C5E57;
      --bg: #FAFBFD;
      --surface: #FFFFFF;
      --text: #1E293B;
      --text-soft: #475569;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --border-light: #CBD5E1;
      --gray-bg: #F1F5F9;
      --shadow-sm: 0 4px 20px rgba(26, 95, 122, 0.08);
      --shadow-hover: 0 12px 32px rgba(26, 95, 122, 0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-dock: 40px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", "Roboto", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      padding-top: 100px;
      font-size: 16px;
    }

    h1, h2, h3, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      color: #0F172A;
      line-height: 1.2;
    }

    h2 {
      font-size: 32px;
      font-weight: 600;
      color: #0F172A;
      margin-bottom: 24px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: #1E293B;
    }

    .section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      body {
        padding-top: 80px;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
      .section {
        padding: 60px 0;
      }
    }

    /* 浮动导航 Dock */
    .navbar-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 1140px;
      z-index: 1050;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      box-shadow: 0 8px 32px rgba(26, 95, 122, 0.12);
      border: 1px solid rgba(226, 232, 240, 0.6);
      padding: 8px 20px;
    }

    .dock-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-text {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      font-size: 24px;
      color: var(--secondary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: #475569;
      text-decoration: none;
      position: relative;
      transition: color 0.2s;
    }

    .nav-link:hover {
      color: var(--primary);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 60%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.2s;
    }

    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }

    .btn-dock-cta {
      background: var(--secondary);
      color: white;
      border-radius: 24px;
      padding: 8px 20px;
      font-weight: 600;
      font-size: 14px;
      text-decoration: none;
      transition: 0.2s;
    }

    .btn-dock-cta:hover {
      background: var(--secondary-dark);
      color: white;
    }

    .navbar-toggler {
      border: none;
      color: var(--primary);
    }

    @media (max-width: 991px) {
      .navbar-dock {
        width: 95%;
        top: 8px;
        border-radius: 28px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }

    @media (min-width: 992px) {
      .mobile-menu {
        display: none;
      }
    }

    /* 按钮 */
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(26, 95, 122, 0.2);
    }

    .btn-primary-custom:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(26, 95, 122, 0.3);
      color: white;
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }

    .btn-outline-custom:hover {
      background: rgba(26, 95, 122, 0.1);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }

    .btn-secondary-custom {
      background: var(--secondary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }

    .btn-secondary-custom:hover {
      background: var(--secondary-dark);
      color: white;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #FAFBFD 0%, #EFF6FC 100%);
      padding: 60px 0;
    }

    .hero-illustration {
      width: 100%;
      max-width: 500px;
      animation: float 4s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }

    /* 数据看板 */
    .counter-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
    }

    .counter-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }

    /* 服务卡片 */
    .service-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: var(--transition);
    }

    .service-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .service-icon {
      font-size: 48px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    /* 对比区块 */
    .compare-bad {
      background: #FEF2F2;
      border: 1px solid #FECACA;
      border-radius: var(--radius-card);
      padding: 32px;
    }

    .compare-good {
      background: #F0FDF4;
      border: 1px solid #BBF7D0;
      border-radius: var(--radius-card);
      padding: 32px;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      color: #1E293B;
      background: white;
      box-shadow: none;
    }

    .accordion-button:not(.collapsed) {
      background: #F8FAFC;
      color: var(--primary);
    }

    .accordion-item {
      border-bottom: 1px solid var(--border);
    }

    /* 表单 */
    .cta-section {
      background: var(--primary);
      position: relative;
      overflow: hidden;
    }

    .cta-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(255,255,255,0.03) 2px, rgba(255,255,255,0.03) 4px);
    }

    .form-control-custom {
      border-radius: var(--radius-input);
      border: 1px solid transparent;
      background: white;
      padding: 12px 16px;
    }

    .form-control-custom:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 0.2rem rgba(15, 118, 110, 0.25);
    }

    footer {
      background: #0F172A;
      color: #CBD5E1;
    }

    footer a {
      color: #CBD5E1;
      text-decoration: none;
    }

    footer a:hover {
      color: white;
    }