/* roulang page: index */
:root {
      --thcz-bg-light: #F8F9FA;
      --thcz-bg-card: #FFFFFF;
      --thcz-primary: #111827;
      --thcz-accent: #00E599;
      --thcz-accent-sub: #06B6D4;
      --thcz-dark-bg: #0B0F17;
      --thcz-dark-surface: #151C28;
      --thcz-text-main: #1F2937;
      --thcz-text-muted: #6B7280;
      --thcz-border: rgba(0, 0, 0, 0.08);
      --thcz-dark-border: rgba(255, 255, 255, 0.1);
      --thcz-radius: 6px;
      --thcz-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--thcz-bg-light);
      color: var(--thcz-text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* 顶行微型信息条 */
    .top-bar {
      background: #0f172a;
      color: #94a3b8;
      font-size: 0.8rem;
      padding: 0.35rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .top-bar a {
      color: #cbd5e1;
      text-decoration: none;
      transition: color 0.2s;
    }
    .top-bar a:hover {
      color: var(--thcz-accent);
    }

    /* 导航栏玻璃沉浸效果 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--thcz-border);
      transition: all 0.3s ease;
    }
    .header-nav.scrolled {
      background: #FFFFFF;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }
    .navbar-brand {
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--thcz-primary) !important;
      font-size: 1.25rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .navbar-brand .dot-indicator {
      width: 8px;
      height: 8px;
      background: var(--thcz-accent);
      border-radius: 50%;
      display: inline-block;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.92rem;
      color: var(--thcz-text-main) !important;
      padding: 0.5rem 0.85rem !important;
      transition: color 0.2s ease;
    }
    .nav-link:hover {
      color: var(--thcz-accent-sub) !important;
    }

    /* 基础通用类重塑 */
    .btn-main {
      background: var(--thcz-primary);
      color: #ffffff;
      border-radius: var(--thcz-radius);
      padding: 0.65rem 1.4rem;
      font-weight: 600;
      font-size: 0.92rem;
      border: 1px solid var(--thcz-primary);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
    }
    .btn-main:hover {
      background: #000000;
      color: #ffffff;
      box-shadow: 0 0 15px rgba(0, 229, 153, 0.2);
    }
    .btn-outline-custom {
      background: transparent;
      color: var(--thcz-primary);
      border: 1px solid rgba(17, 24, 39, 0.3);
      border-radius: var(--thcz-radius);
      padding: 0.65rem 1.4rem;
      font-weight: 600;
      font-size: 0.92rem;
      transition: all 0.25s ease;
      text-decoration: none;
    }
    .btn-outline-custom:hover {
      border-color: var(--thcz-primary);
      background: rgba(0, 0, 0, 0.03);
      color: var(--thcz-primary);
    }
    .section-wrap {
      padding: 5.5rem 0;
      border-bottom: 1px solid var(--thcz-border);
    }
    .section-title {
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--thcz-primary);
      margin-bottom: 0.75rem;
    }
    .section-desc {
      color: var(--thcz-text-muted);
      font-size: 0.98rem;
      max-width: 760px;
      margin-bottom: 3rem;
    }
    .tabular-val {
      font-variant-numeric: tabular-nums;
      font-weight: 800;
      letter-spacing: -0.03em;
    }

    /* 卡片体系 */
    .custom-card {
      background: var(--thcz-bg-card);
      border: 1px solid var(--thcz-border);
      border-radius: var(--thcz-radius);
      padding: 1.8rem;
      height: 100%;
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .custom-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--thcz-shadow);
      border-color: rgba(0, 229, 153, 0.3);
    }

    /* 板块 1: 首屏 Hero */
    .hero-panel {
      position: relative;
      background: url('/assets/images/de82f705aa14de4d.jpg') center/cover no-repeat;
      padding: 7rem 0 6rem 0;
      border-bottom: 1px solid var(--thcz-border);
    }
    .hero-panel::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(248, 249, 250, 0.96) 30%, rgba(248, 249, 250, 0.88) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.82rem;
      font-weight: 600;
      padding: 0.3rem 0.8rem;
      border-radius: 4px;
      background: rgba(0, 0, 0, 0.05);
      border: 1px solid rgba(0,0,0,0.08);
      color: var(--thcz-primary);
      margin-bottom: 1.25rem;
    }
    .hero-floating-card {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(0, 0, 0, 0.1);
      border-radius: var(--thcz-radius);
      padding: 1.5rem;
      box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    }

    /* 板块 6: 深色理念区 */
    .dark-section {
      background: var(--thcz-dark-bg);
      color: #E2E8F0;
      border-top: 1px solid var(--thcz-dark-border);
      border-bottom: 1px solid var(--thcz-dark-border);
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-desc {
      color: #94A3B8;
    }
    .dark-card {
      background: var(--thcz-dark-surface);
      border: 1px solid var(--thcz-dark-border);
      border-radius: var(--thcz-radius);
      padding: 1.8rem;
    }

    /* 手风琴 FAQ 覆写 */
    .accordion-button {
      font-weight: 700;
      color: var(--thcz-primary);
      background-color: var(--thcz-bg-card);
      border-radius: var(--thcz-radius) !important;
      box-shadow: none !important;
      padding: 1.25rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      color: var(--thcz-primary);
      background-color: #f1f5f9;
    }
    .accordion-item {
      border: 1px solid var(--thcz-border);
      margin-bottom: 0.75rem;
      border-radius: var(--thcz-radius) !important;
      overflow: hidden;
    }
    .accordion-body {
      background-color: #f8fafc;
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.7;
    }

    /* 页脚 */
    footer {
      background: #0B0F17;
      color: #94A3B8;
      border-top: 1px solid var(--thcz-dark-border);
      padding: 4.5rem 0 2rem 0;
      font-size: 0.88rem;
    }
    footer h5 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    footer a {
      color: #94A3B8;
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--thcz-accent);
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin: 3rem 0 1.5rem 0;
    }