/* roulang page: index */
:root {
      --primary-deep: #0F172A;
      --accent-amber: #F59E0B;
      --accent-dark: #D97706;
      --bg-page: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-secondary: #334155;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 12px 32px rgba(15, 23, 42, 0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "SF Mono", "Inter", monospace;
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-secondary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text-main);
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 琥珀渐变按钮 */
    .btn-amber {
      background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 12px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }

    .btn-amber:hover {
      background: linear-gradient(135deg, #D97706 0%, #B45309 100%);
      transform: scale(1.03);
      color: white;
      box-shadow: 0 8px 18px rgba(245, 158, 11, 0.4);
    }

    .btn-outline-amber {
      background: transparent;
      border: 1.5px solid var(--accent-amber);
      color: var(--accent-amber);
      font-weight: 600;
      padding: 13px 32px;
      border-radius: 12px;
      transition: var(--transition-smooth);
    }

    .btn-outline-amber:hover {
      background: rgba(245, 158, 11, 0.05);
      border-color: var(--accent-dark);
      color: var(--accent-dark);
      transform: translateY(-2px);
    }

    .text-link-amber {
      color: var(--accent-amber);
      font-weight: 600;
      text-decoration: underline;
      text-underline-offset: 2px;
    }
    .text-link-amber:hover {
      text-decoration: none;
      color: var(--accent-dark);
    }

    /* 导航卡片面板 */
    .navbar-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 10px 24px;
      margin: 16px auto 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      position: sticky;
      top: 16px;
      z-index: 1020;
      backdrop-filter: blur(2px);
    }

    .brand-logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .brand-dot {
      color: var(--accent-amber);
      font-size: 32px;
      line-height: 1;
    }

    .nav-pills-custom .nav-link {
      background: transparent;
      color: var(--text-secondary);
      border-radius: var(--radius-sm);
      padding: 8px 16px;
      font-weight: 500;
      margin: 0 4px;
      transition: var(--transition-smooth);
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }

    .nav-pills-custom .nav-link i {
      font-size: 16px;
      color: var(--accent-amber);
    }

    .nav-pills-custom .nav-link:hover {
      background: #F1F5F9;
      color: var(--primary-deep);
    }

    .navbar-toggler {
      border: none;
      color: var(--primary-deep);
      font-size: 24px;
      padding: 0;
    }

    @media (max-width: 991px) {
      .navbar-card {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-pills-custom {
        flex-direction: column;
        width: 100%;
        margin-top: 12px;
      }
      .nav-pills-custom .nav-link {
        justify-content: flex-start;
        margin: 4px 0;
      }
      .navbar-card .btn-amber {
        margin-top: 12px;
        width: 100%;
        justify-content: center;
      }
    }

    /* Hero 深色看板 */
    .hero-section {
      background: var(--primary-deep);
      border-radius: 0 0 40px 40px;
      padding: 70px 0 80px;
      margin-top: 20px;
      color: white;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
      line-height: 1.3;
    }
    .hero-accent-line {
      width: 60px;
      height: 4px;
      background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
      border-radius: 4px;
      margin: 20px 0 24px;
    }
    .hero-dashboard {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 24px;
      border: 1px solid rgba(245,158,11,0.2);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-blend-mode: overlay;
    }
    .metric-badge {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-amber);
      text-shadow: 0 0 8px rgba(245,158,11,0.5);
    }

    /* 卡片通用 */
    .card-custom {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 28px;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: var(--accent-amber);
    }
    .icon-circle-amber {
      width: 56px;
      height: 56px;
      background: rgba(245,158,11,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-amber);
      font-size: 24px;
      margin-bottom: 16px;
    }
    .data-highlight {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-amber);
    }

    /* 对比区 */
    .compare-card-left {
      background: #F1F5F9;
      border-radius: var(--radius-lg);
      padding: 28px;
      filter: grayscale(20%);
    }
    .compare-card-right {
      background: #FFF7ED;
      border: 2px solid var(--accent-amber);
      border-radius: var(--radius-lg);
      padding: 28px;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #F8FAFC;
      color: var(--primary-deep);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--accent-amber);
    }

    .footer-deep {
      background: var(--primary-deep);
      color: #CBD5E1;
      border-top: 2px solid var(--accent-amber);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .metric-badge {
        font-size: 24px;
      }
    }