/* roulang page: index */
:root {
      --primary: #0A1F2E;
      --secondary: #00C49A;
      --accent: #FF6B35;
      --bg: #F4F6F9;
      --white: #FFFFFF;
      --text: #1e293b;
      --text-light: #64748b;
      --border: #e2e8f0;
      --card-shadow: 0 2px 8px rgba(10,31,46,0.06);
      --card-shadow-hover: 0 8px 24px rgba(10,31,46,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.2s ease;
      --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      font-size: 1rem;
      scroll-behavior: smooth;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航卡片化控制面板 */
    .navbar-custom {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: var(--card-shadow);
      border-radius: 0 0 20px 20px;
      padding: 0.8rem 1.5rem;
      margin: 0 auto;
      max-width: 1140px;
      position: sticky;
      top: 15px;
      z-index: 1050;
      transition: var(--transition);
      border: 1px solid rgba(255,255,255,0.4);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .navbar-brand span {
      color: var(--secondary);
    }
    .nav-link-custom {
      font-weight: 500;
      color: var(--text);
      margin: 0 0.25rem;
      padding: 0.45rem 1rem;
      border-radius: 30px;
      transition: var(--transition);
      background: transparent;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-link-custom i {
      font-size: 1rem;
      color: var(--secondary);
    }
    .nav-link-custom:hover {
      background: rgba(0,196,154,0.08);
      color: var(--primary);
    }
    .nav-link-custom.active {
      background: rgba(0,196,154,0.12);
      color: var(--primary);
      font-weight: 600;
      border-bottom: 2px solid var(--secondary);
    }
    .btn-nav-cta {
      background: var(--accent);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.5rem 1.4rem;
      border-radius: 30px;
      transition: var(--transition);
      font-size: 0.9rem;
    }
    .btn-nav-cta:hover {
      background: #e55a2b;
      color: white;
    }
    .mobile-bottom-menu {
      display: none;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #0A1F2E 0%, #0b2b3d 100%);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
      margin-bottom: 40px;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      color: white;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      max-width: 600px;
    }
    .btn-primary-custom {
      background: var(--secondary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background: #00a882;
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }
    .hero .btn-outline-custom {
      border-color: white;
      color: white;
    }
    .hero .btn-outline-custom:hover {
      background: white;
      color: var(--primary);
    }
    /* 指标看板 */
    .stat-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      padding: 2rem 1.5rem;
      text-align: center;
      transition: var(--transition);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      font-family: var(--font-mono);
      color: var(--secondary);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-light);
      font-weight: 500;
      margin-top: 8px;
    }
    /* 服务矩阵卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      height: 100%;
    }
    .service-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--secondary);
      margin-bottom: 1.2rem;
    }
    /* 对比卡片 */
    .compare-card {
      border-radius: var(--radius-card);
      padding: 2rem;
      background: var(--white);
      box-shadow: var(--card-shadow);
    }
    .compare-old {
      background: #f1f5f9;
    }
    .compare-new {
      background: #e0f7f1;
      border-left: 4px solid var(--secondary);
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: rgba(0,196,154,0.08);
      color: var(--primary);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--secondary);
    }
    /* 表单 */
    .form-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--card-shadow);
    }
    .form-control, .form-select {
      border-radius: var(--radius-input);
      border: 1px solid var(--border);
      padding: 0.6rem 1rem;
    }
    .privacy-text {
      font-size: 0.8rem;
      color: var(--text-light);
    }
    /* 页脚 */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.85);
      padding: 3rem 0 1.5rem;
      margin-top: 3rem;
    }
    .footer a {
      color: rgba(255,255,255,0.9);
    }
    .footer a:hover {
      color: var(--secondary);
    }
    /* 响应式 */
    @media (max-width: 768px) {
      .navbar-custom {
        padding: 0.6rem 1rem;
        border-radius: 0 0 16px 16px;
      }
      .hero-section {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 2rem;
      }
      .container {
        padding: 0 16px;
      }
      .stat-number {
        font-size: 2.2rem;
      }
      .navbar-collapse {
        background: white;
        border-radius: 20px;
        padding: 1rem;
        box-shadow: var(--card-shadow);
      }
      .mobile-bottom-menu {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(10px);
        justify-content: space-around;
        padding: 0.8rem 0;
        border-top: 1px solid var(--border);
        z-index: 1050;
      }
      .mobile-bottom-menu a {
        color: var(--text);
        font-size: 0.8rem;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .desktop-nav {
        display: none;
      }
      .navbar-custom {
        top: 0;
      }
    }
    @media (min-width: 769px) {
      .mobile-bottom-menu {
        display: none;
      }
    }