/* roulang page: index */
:root {
      --brand-primary: #1E40AF;
      --brand-secondary: #0284C7;
      --brand-accent: #06B6D4;
      --brand-dark: #0B1120;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --bg-light: #F8FAFC;
      --bg-alt: #F0F4F8;
      --card-border: rgba(226, 232, 240, 0.9);
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --card-shadow-hover: 0 14px 30px -4px rgba(30, 64, 175, 0.12);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-muted);
      background-color: #FFFFFF;
      line-height: 1.65;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    /* 顶部导航 */
    .site-nav {
      background-color: #FFFFFF;
      border-bottom: 1px solid #E2E8F0;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
      position: sticky;
      top: 0;
      z-index: 1030;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.25rem;
      color: var(--brand-primary);
    }
    .brand-logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.1rem;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main) !important;
      padding: 0.5rem 0.9rem !important;
      transition: color 0.2s ease;
    }
    .nav-link:hover {
      color: var(--brand-secondary) !important;
    }
    .nav-search-bar {
      border-radius: 20px;
      background: var(--bg-light);
      border: 1px solid #E2E8F0;
      padding: 5px 14px;
      font-size: 0.85rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-light);
    }
    .nav-search-bar input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.85rem;
      width: 130px;
    }

    /* 按钮规范 */
    .btn-brand-primary {
      background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
      color: #FFFFFF;
      font-weight: 600;
      border-radius: 8px;
      border: none;
      padding: 0.65rem 1.4rem;
      transition: all 0.25s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-brand-primary:hover {
      background: linear-gradient(135deg, #1d3999, #0274b0);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
      transform: translateY(-1px);
    }
    .btn-brand-outline {
      border: 1px solid #CBD5E1;
      background-color: #FFFFFF;
      color: var(--text-main);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.65rem 1.4rem;
      transition: all 0.25s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-brand-outline:hover {
      border-color: var(--brand-primary);
      color: var(--brand-primary);
      background-color: var(--bg-light);
    }

    /* 通用板块与卡片系统 */
    .section-wrap {
      padding: 5rem 0;
    }
    .section-bg-light {
      background-color: var(--bg-light);
    }
    .section-bg-alt {
      background-color: var(--bg-alt);
    }
    .section-bg-dark {
      background-color: var(--brand-dark);
      color: #F8FAFC;
    }
    .section-title {
      color: var(--text-main);
      font-weight: 800;
      font-size: 2.1rem;
      letter-spacing: -0.02em;
      margin-bottom: 0.75rem;
    }
    .section-desc {
      color: var(--text-light);
      font-size: 1.05rem;
      max-width: 820px;
      margin: 0 auto 2.5rem;
    }

    .custom-card {
      background: #FFFFFF;
      border: 1px solid var(--card-border);
      border-radius: 14px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(2, 132, 199, 0.4);
    }

    /* 首屏特制：选型推荐前置 */
    .hero-banner {
      background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-light) 100%);
      padding: 4.5rem 0 3.5rem;
      border-bottom: 1px solid #E2E8F0;
    }
    .plan-card {
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      border-radius: 16px;
      padding: 1.8rem;
      position: relative;
    }
    .plan-card.highlight {
      border: 2px solid var(--brand-secondary);
      box-shadow: 0 10px 30px rgba(2, 132, 199, 0.15);
      background: linear-gradient(180deg, #FFFFFF 0%, #F0F9FF 100%);
    }
    .badge-pop {
      position: absolute;
      top: -12px;
      right: 20px;
      background: linear-gradient(90deg, #0284C7, #06B6D4);
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* 战术与人格声线卡 */
    .persona-badge {
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 600;
    }
    .sound-wave-box {
      background: #F1F5F9;
      border-radius: 8px;
      padding: 10px 14px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .sound-wave-bars {
      display: flex;
      align-items: center;
      gap: 3px;
      height: 20px;
    }
    .sound-wave-bars span {
      width: 3px;
      background-color: var(--brand-secondary);
      border-radius: 2px;
      animation: wave 1.2s infinite ease-in-out;
    }
    .sound-wave-bars span:nth-child(2) { animation-delay: 0.2s; height: 16px; }
    .sound-wave-bars span:nth-child(3) { animation-delay: 0.4s; height: 10px; }
    .sound-wave-bars span:nth-child(4) { animation-delay: 0.1s; height: 18px; }
    .sound-wave-bars span:nth-child(5) { animation-delay: 0.3s; height: 12px; }
    @keyframes wave {
      0%, 100% { transform: scaleY(0.4); }
      50% { transform: scaleY(1); }
    }

    /* 运行指标条 */
    .metric-item {
      border-right: 1px solid rgba(255, 255, 255, 0.15);
      text-align: center;
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-number {
      font-size: 2.3rem;
      font-weight: 800;
      letter-spacing: -0.03em;
      color: #38BDF8;
    }

    /* 时间轴 */
    .timeline-step {
      position: relative;
      padding-left: 28px;
    }
    .timeline-step::before {
      content: '';
      position: absolute;
      left: 6px;
      top: 10px;
      bottom: -30px;
      width: 2px;
      background: #CBD5E1;
    }
    .timeline-step:last-child::before {
      display: none;
    }
    .timeline-dot {
      position: absolute;
      left: 0;
      top: 4px;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--brand-primary);
      border: 3px solid #DBEAFE;
    }

    /* 对比表格 */
    .table-compare th, .table-compare td {
      padding: 1.1rem 1rem;
      vertical-align: middle;
    }
    .table-compare thead th {
      background-color: #F8FAFC;
      border-bottom: 2px solid #E2E8F0;
      color: var(--text-main);
    }

    /* FAQ 手风琴美化 */
    .accordion-button:not(.collapsed) {
      color: var(--brand-primary);
      background-color: #EFF6FF;
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: #BFDBFE;
    }
    .accordion-item {
      border: 1px solid #E2E8F0;
      border-radius: 10px !important;
      margin-bottom: 12px;
      overflow: hidden;
    }

    /* 页脚 */
    .site-footer {
      background-color: #0F172A;
      color: #94A3B8;
      padding: 4.5rem 0 2.5rem;
      font-size: 0.9rem;
    }
    .site-footer a {
      color: #94A3B8;
      transition: color 0.2s ease;
    }
    .site-footer a:hover {
      color: #FFFFFF;
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      margin: 2.5rem 0 1.5rem;
    }

    @media (max-width: 991px) {
      .metric-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
        padding-bottom: 1rem;
        margin-bottom: 1rem;
      }
      .metric-item:last-child {
        border-bottom: none;
      }
      .section-title {
        font-size: 1.75rem;
      }
    }