/* roulang page: index */
:root {
      --brand-primary: #10B981;
      --brand-primary-hover: #059669;
      --brand-accent: #6366F1;
      --brand-accent-hover: #4F46E5;
      --surface-dark: #0F172A;
      --surface-dark-card: #1E293B;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --card-radius: 8px;
      --btn-radius: 6px;
      --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 10px 25px -4px rgba(15, 23, 42, 0.1);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.75;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      line-height: 1.25;
      font-weight: 700;
    }

    p {
      margin-bottom: 1rem;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    .container {
      max-width: 1200px;
    }

    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }

    .section-title {
      font-size: 2.15rem;
      margin-bottom: 0.75rem;
      position: relative;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.05rem;
      margin-bottom: 2.5rem;
    }

    /* 顶部微型栏与主导航 */
    .header-wrapper {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .top-sub-bar {
      background: #0B1120;
      color: #94A3B8;
      font-size: 0.82rem;
      padding: 0.35rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .top-sub-bar a {
      color: #CBD5E1;
      margin-left: 1.25rem;
    }

    .top-sub-bar a:hover {
      color: var(--brand-primary);
    }

    .main-navbar {
      padding: 0.85rem 0;
    }

    .brand-logo {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .brand-logo i {
      color: var(--brand-primary);
      font-size: 1.6rem;
    }

    .nav-link-custom {
      font-weight: 600;
      font-size: 0.95rem;
      color: #334155;
      padding: 0.5rem 0.85rem !important;
      border-radius: var(--btn-radius);
    }

    .nav-link-custom:hover {
      color: var(--brand-primary);
      background-color: rgba(16, 185, 129, 0.06);
    }

    .btn-action-primary {
      background-color: var(--brand-primary);
      color: #ffffff !important;
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 0.6rem 1.4rem;
      border: 1px solid var(--brand-primary);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.25);
      transition: all 0.25s ease;
    }

    .btn-action-primary:hover {
      background-color: var(--brand-primary-hover);
      border-color: var(--brand-primary-hover);
      box-shadow: 0 6px 18px rgba(16, 185, 129, 0.35);
      transform: translateY(-1px);
    }

    .btn-action-outline {
      background-color: transparent;
      color: #ffffff !important;
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 0.6rem 1.4rem;
      border: 1px solid rgba(255, 255, 255, 0.6);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .btn-action-outline:hover {
      background-color: rgba(255, 255, 255, 0.12);
      border-color: #ffffff;
    }

    .btn-action-secondary {
      background-color: #ffffff;
      color: var(--text-main) !important;
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 0.6rem 1.4rem;
      border: 1px solid var(--border-color);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .btn-action-secondary:hover {
      border-color: var(--brand-accent);
      color: var(--brand-accent) !important;
      background-color: #F8FAFC;
    }

    /* 卡片与组件统一 */
    .card-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-soft);
      transition: all 0.25s ease;
      height: 100%;
      padding: 1.75rem;
    }

    .card-panel:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--brand-primary);
    }

    .card-dark {
      background-color: var(--surface-dark-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      color: #E2E8F0;
    }

    .card-dark:hover {
      border-color: var(--brand-accent);
    }

    .badge-metric {
      background-color: rgba(16, 185, 129, 0.12);
      color: var(--brand-primary);
      padding: 0.35rem 0.75rem;
      border-radius: 4px;
      font-size: 0.85rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.75rem;
    }

    /* 英雄轮播区 */
    .hero-carousel-item {
      min-height: 560px;
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.82) 50%, rgba(15, 23, 42, 0.65) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      color: #ffffff;
      padding: 3.5rem 0;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #ffffff;
      margin-bottom: 1.25rem;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: #CBD5E1;
      max-width: 680px;
      margin-bottom: 2rem;
      line-height: 1.8;
    }

    /* 数据指标条 */
    .metrics-bar {
      background: #0B1120;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding: 2.5rem 0;
      color: #ffffff;
    }

    .metric-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--brand-primary);
      line-height: 1;
      margin-bottom: 0.5rem;
      font-family: monospace, sans-serif;
    }

    .metric-label {
      color: #94A3B8;
      font-size: 0.9rem;
      font-weight: 500;
    }

    /* 常见问题手风琴 */
    .accordion-button:not(.collapsed) {
      color: var(--brand-primary);
      background-color: rgba(16, 185, 129, 0.05);
      box-shadow: none;
    }

    .accordion-button:focus {
      border-color: var(--brand-primary);
      box-shadow: 0 0 0 0.25rem rgba(16, 185, 129, 0.15);
    }

    .accordion-item {
      border-color: var(--border-color);
      border-radius: var(--card-radius) !important;
      overflow: hidden;
      margin-bottom: 0.85rem;
    }

    /* 底部固定条 */
    .sticky-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(15, 23, 42, 0.96);
      backdrop-filter: blur(8px);
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding: 0.75rem 1rem;
      z-index: 1020;
      color: #ffffff;
      box-shadow: 0 -4px 16px rgba(0,0,0,0.2);
    }

    /* 响应式修正 */
    @media (max-width: 991.98px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .section-padding {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
      }
    }