/* roulang page: index */
:root {
      --primary: #0F172A;
      --primary-light: #1E293B;
      --accent: #10B981;
      --accent-hover: #059669;
      --accent-blue: #0EA5E9;
      --bg-neutral: #F8FAFC;
      --bg-card: #FFFFFF;
      --dark-section: #020617;
      --text-main: #334155;
      --text-muted: #64748B;
      --text-heading: #0F172A;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-pill: 9999px;
      --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 12px 24px -4px rgba(15, 23, 42, 0.08);
      --transition-base: cubic-bezier(0.16, 1, 0.3, 1) 250ms;
    }

    /* 基础 Reset 与字体 */
    * { box-sizing: border-box; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-neutral);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    a { text-decoration: none; color: inherit; transition: all var(--transition-base); }
    img { max-width: 100%; height: auto; display: block; }

    /* 顶部双行状态条与主导航 */
    .top-status-bar {
      height: 38px;
      background-color: #F1F5F9;
      font-size: 0.785rem;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border-color);
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      display: inline-block;
      margin-right: 6px;
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
    }
    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1020;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
    }
    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo i {
      color: var(--accent);
      font-size: 1.5rem;
    }
    
    /* 分段标签导航 Chip / Tab */
    .nav-segment-container {
      background: #F1F5F9;
      padding: 4px;
      border-radius: var(--radius-pill);
      display: inline-flex;
      overflow-x: auto;
      max-width: 100%;
      white-space: nowrap;
      scrollbar-width: none;
    }
    .nav-segment-container::-webkit-scrollbar { display: none; }
    .nav-segment-item {
      padding: 6px 16px;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: var(--radius-pill);
      transition: all var(--transition-base);
    }
    .nav-segment-item:hover, .nav-segment-item.active {
      color: var(--primary);
      background-color: #FFFFFF;
      box-shadow: 0 2px 6px rgba(15, 23, 42, 0.06);
    }

    /* 按钮重塑 */
    .btn-brand-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.92rem;
      border: 1px solid var(--primary);
      transition: all var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-brand-primary:hover {
      background-color: var(--primary-light);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .btn-brand-accent {
      background-color: var(--accent);
      color: #FFFFFF;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.92rem;
      border: 1px solid var(--accent);
      transition: all var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-brand-accent:hover {
      background-color: var(--accent-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(16, 185, 129, 0.25);
    }
    .btn-brand-outline {
      background-color: transparent;
      color: var(--primary);
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      transition: all var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-brand-outline:hover {
      background-color: #F1F5F9;
      color: var(--primary);
      border-color: #CBD5E1;
      transform: translateY(-2px);
    }

    /* 卡片与通用板块 */
    .site-section {
      padding: 85px 0;
      position: relative;
    }
    .site-section-alt {
      background-color: #FFFFFF;
    }
    .site-section-dark {
      background-color: var(--dark-section);
      color: #F8FAFC;
    }
    .site-section-dark h2, .site-section-dark h3, .site-section-dark h4 {
      color: #FFFFFF;
    }
    .site-section-dark .text-muted {
      color: #94A3B8 !important;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent);
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      margin-bottom: 16px;
      border: 1px solid rgba(16, 185, 129, 0.2);
    }
    .section-title {
      font-size: 2.25rem;
      margin-bottom: 18px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 50px auto;
    }
    .standard-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      height: 100%;
      position: relative;
    }
    .standard-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
      border-color: #CBD5E1;
    }

    /* 首屏 Hero */
    .hero-section {
      position: relative;
      background-color: #FFFFFF;
      padding: 90px 0 80px 0;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-h1 {
      font-size: 3.25rem;
      line-height: 1.18;
      margin-bottom: 24px;
      letter-spacing: -0.03em;
    }
    .hero-lead {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.8;
    }
    .checklist-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 36px;
      font-size: 0.9rem;
      color: var(--text-main);
      font-weight: 500;
    }
    .checklist-bar span {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .checklist-bar i {
      color: var(--accent);
    }
    .hero-img-box {
      position: relative;
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
      border: 1px solid var(--border-color);
    }

    /* 倒计时保障横幅 */
    .timer-strip {
      background: #0B1120;
      color: #FFFFFF;
      padding: 24px 0;
      border-bottom: 1px solid #1E293B;
    }
    .timer-unit {
      background: #1E293B;
      padding: 8px 14px;
      border-radius: 6px;
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--accent);
      border: 1px solid #334155;
    }

    /* 数据统计条 */
    .metrics-bar {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 50px 0;
    }
    .metric-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
      font-feature-settings: "tnum";
    }

    /* 对比表格重塑 */
    .comparison-table {
      width: 100%;
      background: #FFFFFF;
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }
    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }
    .comparison-table th {
      background: #F8FAFC;
      font-weight: 700;
      color: var(--primary);
    }

    /* 手风琴改造 */
    .custom-accordion .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 14px;
      overflow: hidden;
      background: #FFFFFF;
    }
    .custom-accordion .accordion-button {
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--primary);
      background-color: #FFFFFF;
      padding: 18px 24px;
      box-shadow: none;
    }
    .custom-accordion .accordion-button:not(.collapsed) {
      color: var(--accent-hover);
      background-color: #F8FAFC;
    }
    .custom-accordion .accordion-body {
      padding: 18px 24px;
      color: var(--text-main);
      font-size: 0.95rem;
      line-height: 1.8;
      border-top: 1px solid var(--border-color);
    }

    /* 底部浮动转化条 */
    .fixed-conversion-strip {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(15, 23, 42, 0.94);
      backdrop-filter: blur(10px);
      padding: 14px 0;
      color: #FFFFFF;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
    }

    /* 页脚 */
    .site-footer {
      background: #020617;
      color: #94A3B8;
      padding: 70px 0 110px 0;
      font-size: 0.875rem;
      border-top: 1px solid #1E293B;
    }
    .footer-title {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }

    @media (max-width: 991px) {
      .hero-h1 { font-size: 2.3rem; }
      .section-title { font-size: 1.85rem; }
      .metric-number { font-size: 2rem; }
    }
    @media (max-width: 767px) {
      .hero-h1 { font-size: 1.95rem; }
      .site-section { padding: 60px 0; }
      .fixed-conversion-strip .lead-text { display: none; }
    }