/* roulang page: index */
:root {
      --primary-color: #ff3366;
      --primary-dark: #d61f50;
      --primary-light: #fff0f3;
      --secondary-color: #6366f1;
      --accent-gradient: linear-gradient(135deg, #ff3366 0%, #ff6b8b 50%, #7928ca 100%);
      --dark-surface: #0f172a;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-soft: #f8fafc;
      --card-radius: 20px;
      --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.65;
      padding-bottom: 72px; /* 移动端Tab预留空间 */
    }

    @media (min-width: 992px) {
      body {
        padding-bottom: 0;
      }
    }

    /* 顶部导航 */
    .site-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      position: sticky;
      top: 0;
      z-index: 1020;
    }

    .brand-logo {
      font-size: 1.45rem;
      font-weight: 800;
      background: var(--accent-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .brand-logo i {
      -webkit-text-fill-color: var(--primary-color);
    }

    .nav-link-custom {
      font-weight: 600;
      color: var(--text-main);
      padding: 0.5rem 1rem;
      border-radius: 999px;
      transition: var(--transition-smooth);
    }

    .nav-link-custom.active,
    .nav-link-custom:hover {
      color: var(--primary-color);
      background: var(--primary-light);
    }

    /* 全宽沉浸 Hero 视频/视觉遮罩 */
    .hero-immersive {
      position: relative;
      background: linear-gradient(180deg, #111827 0%, #1e1b4b 100%);
      color: #ffffff;
      padding: 85px 0 100px;
      overflow: hidden;
    }

    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 70% 30%, rgba(255, 51, 102, 0.25) 0%, transparent 60%),
                  radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.3) 0%, transparent 65%);
      pointer-events: none;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      color: #fed7aa;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-desc {
      font-size: 1.12rem;
      color: #cbd5e1;
      max-width: 780px;
      margin: 0 auto 36px;
    }

    .hero-video-stage {
      position: relative;
      background: #000;
      border-radius: 24px;
      border: 2px solid rgba(255, 255, 255, 0.15);
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
      overflow: hidden;
      aspect-ratio: 16 / 9;
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #1f2937, #111827);
    }

    .play-pulse-btn {
      width: 76px;
      height: 76px;
      background: var(--accent-gradient);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.8rem;
      box-shadow: 0 0 0 0 rgba(255, 51, 102, 0.7);
      animation: pulse 2s infinite;
      cursor: pointer;
      border: none;
      transition: var(--transition-smooth);
    }

    .play-pulse-btn:hover {
      transform: scale(1.1);
      color: #fff;
    }

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(255, 51, 102, 0.7);
      }
      70% {
        box-shadow: 0 0 0 22px rgba(255, 51, 102, 0);
      }
      100% {
        box-shadow: 0 0 0 0 rgba(255, 51, 102, 0);
      }
    }

    /* 通用组件 */
    .section-wrap {
      padding: 70px 0;
    }

    .section-wrap.bg-light-soft {
      background-color: var(--bg-soft);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 40px;
      font-size: 1.05rem;
    }

    .modern-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--card-radius);
      padding: 28px;
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.04);
      transition: var(--transition-smooth);
      height: 100%;
    }

    .modern-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
      border-color: #cbd5e1;
    }

    .badge-soft {
      background: var(--primary-light);
      color: var(--primary-color);
      font-weight: 600;
      padding: 6px 12px;
      border-radius: 8px;
      font-size: 0.85rem;
    }

    .btn-gradient {
      background: var(--accent-gradient);
      color: #ffffff;
      font-weight: 600;
      border: none;
      padding: 12px 28px;
      border-radius: 999px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 14px rgba(255, 51, 102, 0.35);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-gradient:hover {
      color: #ffffff;
      box-shadow: 0 6px 20px rgba(255, 51, 102, 0.5);
      transform: translateY(-1px);
    }

    .btn-outline-custom {
      border: 1px solid #cbd5e1;
      color: var(--text-main);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 999px;
      background: transparent;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-outline-custom:hover {
      background: #f1f5f9;
      color: var(--text-main);
      border-color: #94a3b8;
    }

    /* 对比表格卡片 */
    .compare-box {
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      overflow: hidden;
    }

    .compare-header {
      padding: 20px;
      font-weight: 700;
      font-size: 1.15rem;
    }

    .compare-header.old {
      background: #f8fafc;
      color: #64748b;
    }

    .compare-header.new {
      background: var(--primary-light);
      color: var(--primary-color);
    }

    .compare-body {
      padding: 24px;
    }

    .compare-list-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 0.96rem;
    }

    /* 移动优先底部 Tab 导航 */
    .mobile-tab-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 64px;
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(10px);
      border-top: 1px solid #e2e8f0;
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1040;
      box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.05);
    }

    @media (min-width: 992px) {
      .mobile-tab-bar {
        display: none !important;
      }
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: #64748b;
      text-decoration: none;
      font-size: 0.75rem;
      font-weight: 500;
      flex: 1;
    }

    .tab-item i {
      font-size: 1.35rem;
      margin-bottom: 2px;
    }

    .tab-item.active {
      color: var(--primary-color);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0b1120;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.95rem;
      border-top: 1px solid #1e293b;
    }

    .footer-logo {
      font-size: 1.4rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 14px;
      display: inline-block;
    }

    .footer-link-group {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .footer-link-group li {
      margin-bottom: 10px;
    }

    .footer-link-group a {
      color: #94a3b8;
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    .footer-link-group a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      margin-top: 45px;
      padding-top: 25px;
      border-top: 1px solid #1e293b;
      font-size: 0.88rem;
    }