/* roulang page: index */
:root {
      --primary: #0f4c81;
      --primary-dark: #0a3a62;
      --accent: #00b4d8;
      --bg: #f8fafd;
      --card-bg: #ffffff;
      --text-dark: #1a1a2e;
      --text-mid: #5a5a7a;
      --text-light: #8a8a9a;
      --success: #10b981;
      --warning-gray: #9ca3af;
      --border-light: #eef0f5;
      --radius-lg: 40px;
      --radius-card: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: all 0.25s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Menlo", "SF Mono", "Courier New", monospace;
    }
    *, *::before, *::after {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 浮动导航 Dock */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 960px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      padding: 0.5rem 1.8rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 10px 25px rgba(0,0,0,0.06);
      z-index: 999;
      transition: var(--transition);
      border: 1px solid rgba(255,255,255,0.5);
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.8rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-mid);
      padding: 0.3rem 0;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: #fff;
      border-radius: 30px;
      padding: 0.5rem 1.8rem;
      font-weight: 600;
      font-size: 0.9rem;
      white-space: nowrap;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(15,76,129,0.25);
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      color: #fff;
      transform: scale(1.02);
      box-shadow: 0 6px 14px rgba(15,76,129,0.35);
    }
    .hamburger {
      display: none;
      font-size: 1.5rem;
      color: var(--text-dark);
      cursor: pointer;
      background: none;
      border: none;
    }
    @media (max-width: 768px) {
      .nav-dock {
        width: calc(100% - 32px);
        padding: 0.6rem 1.2rem;
        left: 16px;
        transform: none;
        border-radius: 28px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 1rem;
        right: 1rem;
        background: white;
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem;
        border-radius: 24px;
        box-shadow: var(--shadow-hover);
        backdrop-filter: blur(20px);
        background: rgba(255,255,255,0.96);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-cta.desktop-cta {
        display: none;
      }
    }
    @media (min-width: 769px) {
      .mobile-cta {
        display: none;
      }
    }
    /* Hero */
    #hero {
      padding: 140px 0 100px;
      position: relative;
      background: linear-gradient(180deg, #f0f5fc 0%, var(--bg) 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: clamp(2.8rem, 6vw, 4rem);
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-text h2 {
      font-size: 1.25rem;
      font-weight: 400;
      color: var(--text-mid);
      margin-bottom: 2rem;
      line-height: 1.7;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-radius: 30px;
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      border: none;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(15,76,129,0.3);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(15,76,129,0.4);
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: 30px;
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(15,76,129,0.06);
      color: var(--primary-dark);
      border-color: var(--primary-dark);
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 0.75rem;
    }
    .section-sub {
      color: var(--text-mid);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 1.8rem 1.5rem;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
      position: relative;
    }
    .stat-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .stat-value {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.3rem;
    }
    .stat-label {
      color: var(--text-mid);
      font-weight: 500;
    }
    .live-dot {
      position: absolute;
      top: 15px;
      right: 18px;
      background: var(--success);
      width: 10px;
      height: 10px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      gap: 4px;
      font-size: 0.7rem;
      color: var(--success);
      font-weight: 600;
    }
    .micro-chart {
      margin-top: 1rem;
      height: 40px;
      background: linear-gradient(90deg, var(--accent) 20%, #e0f2fe 90%);
      border-radius: 6px;
      opacity: 0.7;
    }
    @media (max-width: 1024px) {
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 2rem;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .service-card h3 {
      font-weight: 600;
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    .service-desc {
      color: var(--text-mid);
      flex: 1;
    }
    .trust-badge {
      margin-top: 1rem;
      font-weight: 600;
      color: var(--primary);
      font-size: 0.9rem;
    }
    .service-link {
      margin-top: 1.5rem;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .service-link i {
      transition: transform 0.2s;
    }
    .service-link:hover i {
      transform: translateX(4px);
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .comparison-wrapper {
      display: flex;
      align-items: center;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .vs-badge {
      background: white;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      box-shadow: var(--shadow-md);
      color: var(--text-dark);
    }
    .compare-col {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 1.4rem;
    }
    .progress-bg {
      background: #e9ecef;
      height: 8px;
      border-radius: 10px;
      width: 100%;
      margin-top: 0.3rem;
    }
    .progress-fill {
      background: var(--primary);
      height: 8px;
      border-radius: 10px;
      width: 0%;
    }
    .before .progress-fill {
      background: var(--warning-gray);
    }
    @media (max-width: 768px) {
      .comparison-wrapper {
        flex-direction: column;
      }
      .vs-badge {
        margin: 0.5rem 0;
      }
    }
    /* FAQ */
    .accordion-item {
      background: #f9fafc;
      border-radius: var(--radius-xs);
      margin-bottom: 0.8rem;
      padding: 1.2rem 1.5rem;
      cursor: pointer;
      transition: background 0.2s;
    }
    .accordion-header {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      margin-top: 1rem;
      color: var(--text-mid);
      border-left: 3px solid transparent;
      padding-left: 0;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      border-left: 3px solid var(--primary);
      padding-left: 1rem;
      background: #fff;
    }
    /* 表单 */
    .input-field {
      border: none;
      border-bottom: 2px solid #d1d5db;
      border-radius: 0;
      padding: 0.7rem 0.2rem;
      width: 100%;
      background: transparent;
      transition: border 0.2s;
      font-size: 1rem;
    }
    .input-field:focus {
      outline: none;
      border-bottom: 2px solid var(--primary);
      box-shadow: 0 4px 8px -6px var(--primary);
    }
    .submit-btn {
      background: var(--primary);
      color: white;
      border-radius: 30px;
      padding: 0.9rem;
      font-weight: 600;
      border: none;
      width: 100%;
      transition: var(--transition);
    }
    .submit-btn:hover {
      background: var(--primary-dark);
      transform: scale(1.01);
    }
    footer {
      background: #1a1a2e;
      color: #ddd;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }