/* roulang page: index */
:root {
      --td-primary: #ff5722;
      --td-primary-dark: #e64a19;
      --td-primary-light: #ff8a50;
      --td-accent: #ff9800;
      --td-bg-dark: #121418;
      --td-bg-surface: #1e2229;
      --td-bg-card: #272d36;
      --td-text-main: #f5f6f8;
      --td-text-muted: #9ba3af;
      --td-border: #363d4a;
      --td-radius-sm: 8px;
      --td-radius-md: 14px;
      --td-radius-lg: 20px;
      --td-shadow: 0 10px 30px rgba(0,0,0,0.35);
      --td-glow: 0 0 25px rgba(255, 87, 34, 0.3);
    }

    body {
      background-color: var(--td-bg-dark);
      color: var(--td-text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    a:hover {
      color: var(--td-primary-light);
    }

    /* Navbar Custom */
    .td-navbar {
      background-color: rgba(18, 20, 24, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--td-border);
      padding: 0.85rem 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .td-brand {
      font-size: 1.6rem;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .td-brand-badge {
      background: linear-gradient(135deg, var(--td-primary), var(--td-accent));
      color: #fff;
      font-size: 0.75rem;
      padding: 0.2rem 0.6rem;
      border-radius: 20px;
      font-weight: 700;
    }
    .nav-link.active-custom {
      color: var(--td-primary-light) !important;
      font-weight: 600;
    }

    /* Hero Section (白皮书获客 / 资料封面+目录摘要+留资) */
    .hero-section {
      background: linear-gradient(rgba(18, 20, 24, 0.82), rgba(18, 20, 24, 0.95)),
                  url('/assets/images/40019ab015b6fd10.webp') center/cover no-repeat;
      padding: 4.5rem 0 5rem;
      border-bottom: 1px solid var(--td-border);
    }
    .hero-h1 {
      font-size: 2.35rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 1.25rem;
      background: linear-gradient(45deg, #ffffff, #ffb399);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.05rem;
      color: var(--td-text-muted);
      margin-bottom: 1.75rem;
    }
    .whitepaper-cover-box {
      background: var(--td-bg-surface);
      border: 1px solid var(--td-border);
      border-radius: var(--td-radius-md);
      padding: 1.5rem;
      box-shadow: var(--td-shadow);
      position: relative;
    }
    .report-badge {
      position: absolute;
      top: 1rem;
      right: 1rem;
      background: var(--td-primary);
      color: #fff;
      font-size: 0.75rem;
      padding: 0.35rem 0.75rem;
      border-radius: var(--td-radius-sm);
      font-weight: bold;
    }

    /* Common Card & Section */
    .section-padding {
      padding: 4.5rem 0;
      border-bottom: 1px solid var(--td-border);
    }
    .section-title {
      font-size: 1.85rem;
      font-weight: 800;
      margin-bottom: 0.65rem;
      color: #fff;
    }
    .section-desc {
      color: var(--td-text-muted);
      font-size: 0.95rem;
      margin-bottom: 2.5rem;
    }
    .td-card {
      background: var(--td-bg-surface);
      border: 1px solid var(--td-border);
      border-radius: var(--td-radius-md);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      height: 100%;
      overflow: hidden;
    }
    .td-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--td-shadow);
      border-color: var(--td-primary);
    }
    .td-card-img {
      width: 100%;
      height: 190px;
      object-fit: cover;
    }
    .td-card-body {
      padding: 1.35rem;
    }
    .td-btn-primary {
      background: linear-gradient(135deg, var(--td-primary), var(--td-primary-dark));
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 0.65rem 1.4rem;
      border-radius: var(--td-radius-sm);
      box-shadow: 0 4px 15px rgba(255, 87, 34, 0.4);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }
    .td-btn-primary:hover {
      background: linear-gradient(135deg, var(--td-primary-light), var(--td-primary));
      color: #fff;
      transform: translateY(-1px);
    }
    .td-btn-outline {
      border: 1px solid var(--td-border);
      color: var(--td-text-main);
      font-weight: 600;
      padding: 0.65rem 1.4rem;
      border-radius: var(--td-radius-sm);
      background: rgba(255, 255, 255, 0.05);
    }
    .td-btn-outline:hover {
      border-color: var(--td-primary-light);
      background: rgba(255, 87, 34, 0.1);
      color: #fff;
    }

    /* Chips & Tags */
    .filter-chip {
      background: var(--td-bg-surface);
      border: 1px solid var(--td-border);
      color: var(--td-text-muted);
      padding: 0.4rem 1rem;
      border-radius: 30px;
      font-size: 0.85rem;
      cursor: pointer;
      display: inline-block;
      margin: 0.25rem;
      transition: all 0.2s;
    }
    .filter-chip.active, .filter-chip:hover {
      border-color: var(--td-primary);
      color: #fff;
      background: rgba(255, 87, 34, 0.15);
    }

    /* Table / Row KPI */
    .kpi-row {
      background: var(--td-bg-surface);
      border: 1px solid var(--td-border);
      border-radius: var(--td-radius-sm);
      padding: 1rem 1.25rem;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: border-color 0.2s;
    }
    .kpi-row:hover {
      border-color: var(--td-primary-light);
    }

    /* Progress & Roadmap */
    .route-card {
      background: var(--td-bg-surface);
      border-left: 4px solid var(--td-primary);
      border-radius: 0 var(--td-radius-sm) var(--td-radius-sm) 0;
      padding: 1.25rem;
      margin-bottom: 1rem;
    }

    /* Floating Bar */
    .floating-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(20, 23, 29, 0.95);
      border-top: 1px solid var(--td-primary);
      padding: 0.85rem 1rem;
      z-index: 1000;
      backdrop-filter: blur(10px);
      box-shadow: 0 -5px 25px rgba(0, 0, 0, 0.5);
    }

    /* Footer */
    .td-footer {
      background: #0d0f12;
      border-top: 1px solid var(--td-border);
      padding: 4rem 0 5.5rem;
      font-size: 0.9rem;
      color: var(--td-text-muted);
    }