/* roulang page: index */
:root {
      --app-primary: #00E575;
      --app-primary-hover: #00c966;
      --app-accent: #0066FF;
      --app-dark: #0B0E14;
      --app-dark-card: #141923;
      --app-surface: #FFFFFF;
      --app-bg-muted: #F8F9FA;
      --app-border: rgba(15, 23, 42, 0.08);
      --app-text-main: #0F172A;
      --app-text-muted: #64748B;
      --app-radius: 10px;
      --app-shadow: 0 8px 30px -4px rgba(15, 23, 42, 0.05);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
      color: var(--app-text-main);
      background-color: #FFFFFF;
      line-height: 1.65;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }

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

    /* 顶通双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1020;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--app-border);
    }
    .top-meta-bar {
      background: var(--app-dark);
      color: #94A3B8;
      font-size: 12px;
      padding: 6px 0;
    }
    .top-meta-bar a {
      color: #CBD5E1;
    }
    .main-navbar {
      padding: 14px 0;
    }
    .brand-logo-txt {
      font-weight: 800;
      font-size: 20px;
      letter-spacing: -0.5px;
      color: var(--app-dark);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo-badge {
      background: var(--app-primary);
      color: var(--app-dark);
      font-size: 11px;
      font-weight: 800;
      padding: 2px 7px;
      border-radius: 4px;
      text-transform: uppercase;
    }
    .nav-link-custom {
      font-weight: 600;
      color: #334155;
      margin: 0 10px;
      font-size: 14.5px;
      transition: color 0.2s;
    }
    .nav-link-custom:hover {
      color: var(--app-accent);
    }

    /* 按钮与通用组件 */
    .btn-speed {
      background: var(--app-primary);
      color: #052410;
      font-weight: 700;
      padding: 11px 26px;
      border-radius: 8px;
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(0, 229, 117, 0.3);
    }
    .btn-speed:hover {
      background: var(--app-primary-hover);
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 229, 117, 0.4);
    }
    .btn-outline-speed {
      background: transparent;
      color: var(--app-dark);
      border: 1.5px solid var(--app-dark);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 8px;
      transition: all 0.2s;
    }
    .btn-outline-speed:hover {
      background: var(--app-dark);
      color: #fff;
    }
    .section-head {
      margin-bottom: 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: 6px;
      background: rgba(0, 102, 255, 0.08);
      color: var(--app-accent);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 14px;
      color: var(--app-dark);
    }
    .section-desc {
      color: var(--app-text-muted);
      font-size: 15.5px;
      max-width: 680px;
      margin: 0 auto;
    }

    /* 板块容器与背景 */
    .section-py {
      padding: 92px 0;
    }
    .bg-light-tone {
      background-color: var(--app-bg-muted);
      border-top: 1px solid var(--app-border);
      border-bottom: 1px solid var(--app-border);
    }
    .bg-dark-pitch {
      background-color: var(--app-dark);
      color: #FFFFFF;
    }

    /* 样式卡片通用 */
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--app-border);
      border-radius: var(--app-radius);
      padding: 30px;
      height: 100%;
      box-shadow: var(--app-shadow);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
      border-color: rgba(0, 102, 255, 0.2);
    }
    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: #EDF5FF;
      color: var(--app-accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
    }

    /* Bento 首屏 */
    .hero-bento-section {
      padding: 70px 0 80px 0;
      background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
    }
    .bento-hero-main {
      background: var(--app-dark);
      color: #fff;
      border-radius: 16px;
      padding: 48px;
      position: relative;
      overflow: hidden;
      min-height: 440px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .bento-hero-main::before {
      content: "";
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      background-image: url('/assets/images/03c11a4e6edc139e.jpg');
      background-size: cover;
      background-position: center;
      opacity: 0.22;
      pointer-events: none;
    }
    .bento-subcard {
      background: #FFFFFF;
      border: 1px solid var(--app-border);
      border-radius: 14px;
      padding: 28px;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--app-shadow);
    }
    .bento-cta-bar {
      margin-top: 24px;
      background: #F1F5F9;
      border-radius: 12px;
      padding: 18px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border: 1px dashed #CBD5E1;
    }

    /* 指标横幅 */
    .metric-value {
      font-size: 38px;
      font-weight: 800;
      color: var(--app-dark);
      line-height: 1;
      font-feature-settings: "tnum";
    }
    .metric-label {
      font-size: 13.5px;
      color: var(--app-text-muted);
      margin-top: 6px;
    }

    /* 对比表格/卡片 */
    .matrix-box-old {
      background: #FFF5F5;
      border: 1px solid #FFE3E3;
      border-radius: 12px;
      padding: 32px;
    }
    .matrix-box-new {
      background: #F0FDF4;
      border: 2px solid var(--app-primary);
      border-radius: 12px;
      padding: 32px;
    }

    /* 时间轴 */
    .timeline-item {
      position: relative;
      padding-left: 28px;
      border-left: 2px solid #E2E8F0;
      margin-bottom: 30px;
    }
    .timeline-item::after {
      content: "";
      position: absolute;
      left: -7px;
      top: 6px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--app-accent);
      border: 2px solid #fff;
    }

    /* 手风琴精简定制 */
    .accordion-button:not(.collapsed) {
      color: var(--app-accent);
      background-color: #F8FAFC;
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(0, 102, 255, 0.2);
    }

    /* 页脚 */
    .site-footer {
      background: #07090D;
      color: #94A3B8;
      padding: 72px 0 28px;
      font-size: 13.5px;
      border-top: 1px solid #1E293B;
    }
    .footer-heading {
      color: #F8FAFC;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-link {
      color: #94A3B8;
      display: block;
      margin-bottom: 10px;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--app-primary);
    }

    @media (max-width: 991px) {
      .section-py { padding: 60px 0; }
      .bento-hero-main { min-height: auto; padding: 32px 20px; }
      .bento-cta-bar { flex-direction: column; gap: 14px; text-align: center; }
      .section-title { font-size: 26px; }
    }