/* roulang page: index */
:root {
      --primary: #0A2540;
      --primary-light: #1A3A5C;
      --accent: #F6AE2D;
      --accent-glow: rgba(246, 174, 45, 0.35);
      --bg: #F8FAFC;
      --surface: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --border: #E2E8F0;
      --success: #059669;
      --alert: #DC2626;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 1px 3px rgba(10,37,64,0.08), 0 1px 2px rgba(10,37,64,0.06);
      --shadow-hover: 0 14px 28px rgba(10,37,64,0.14), 0 6px 12px rgba(10,37,64,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-number: "Inter", "SF Pro Text", system-ui, -apple-system, sans-serif;
      --transition-base: 0.25s cubic-bezier(0.2, 0.0, 0.0, 1.0);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 2px;
    }
    .logo-text span {
      color: var(--accent);
      font-weight: 800;
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition-base);
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition-base);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent);
      color: #0A2540 !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 4px 12px var(--accent-glow);
      transition: all var(--transition-base);
    }
    .nav-cta:hover {
      background: #e09c1a;
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      transform: translateY(-100%);
      transition: transform 0.35s ease;
      z-index: 40;
    }
    .mobile-menu.open {
      transform: translateY(0);
    }
    .mobile-menu a {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--primary);
      text-decoration: none;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 2rem;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }

    /* 板块间距 */
    section {
      padding: 80px 0;
      scroll-margin-top: 72px;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* 标题系统 */
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.25;
      color: #FFFFFF;
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
      color: var(--primary);
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* 卡片通用 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      border: 1px solid var(--border);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: transparent;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      border: none;
      transition: background var(--transition-base), box-shadow var(--transition-base);
      box-shadow: 0 2px 8px rgba(10,37,64,0.2);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: var(--primary-light);
      box-shadow: 0 8px 18px rgba(10,37,64,0.25);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      font-weight: 600;
      transition: all var(--transition-base);
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(10,37,64,0.06);
    }
    .btn-accent {
      background: var(--accent);
      color: #0A2540;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 30px;
      box-shadow: 0 0 16px var(--accent-glow);
      border: none;
      transition: 0.25s;
    }
    .btn-accent:hover {
      background: #e5a020;
      box-shadow: 0 0 24px rgba(246,174,45,0.5);
    }

    /* Hero 实时数据小样 */
    .live-badge {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border-radius: 30px;
      padding: 6px 16px;
      color: white;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
    }
    .live-dot {
      width: 10px;
      height: 10px;
      background: var(--alert);
      border-radius: 50%;
      animation: pulse 1.4s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.3); }
      100% { opacity: 1; transform: scale(1); }
    }

    /* 指标数字 */
    .metric-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      font-weight: 600;
      color: var(--primary);
      cursor: pointer;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #F1F5F9;
      border-radius: 8px;
      color: var(--text-secondary);
      margin-bottom: 4px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* 对比卡片 */
    .compare-badge {
      color: var(--success);
      font-weight: 700;
    }
    .compare-dim {
      color: var(--text-secondary);
    }
    .right-highlight {
      border-left: 4px solid var(--accent);
      padding-left: 16px;
    }

    footer {
      background: var(--primary);
      color: #CBD5E1;
      padding: 48px 0 24px;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      h1 { font-size: 2rem; }
      .metric-number { font-size: 2.2rem; }
    }
    .bg-hero {
      background: linear-gradient(135deg, rgba(10,37,64,0.78) 0%, rgba(10,37,64,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }