/* roulang page: index */
:root {
      --primary: #ff3366;
      --primary-dark: #d81b4d;
      --primary-light: #fff0f3;
      --accent: #7928ca;
      --dark: #0f111a;
      --dark-card: #161926;
      --text-main: #1f2430;
      --text-muted: #5e6678;
      --bg-light: #f7f9fc;
      --bg-white: #ffffff;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 36px rgba(255,51,102,0.14);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.68;
      -webkit-font-smoothing: antialiased;
    }

    /* 滚动收缩双层导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1040;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .nav-top-row {
      padding: 12px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      transition: var(--transition);
    }
    .nav-bottom-row {
      padding: 10px 0;
      transition: var(--transition);
    }
    .site-header.scrolled .nav-top-row {
      display: none;
    }
    .site-header.scrolled .nav-bottom-row {
      padding: 12px 0;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    }
    .brand-logo {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: -0.5px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo:hover { color: var(--primary-dark); }
    .nav-badge-tag {
      font-size: 11px;
      background: var(--primary-light);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 600;
      vertical-align: middle;
    }
    .nav-search-bar {
      max-width: 440px;
      position: relative;
    }
    .nav-search-bar input {
      border-radius: 30px;
      padding: 8px 20px 8px 42px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      background: var(--bg-light);
      transition: var(--transition);
    }
    .nav-search-bar input:focus {
      background: #fff;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255,51,102,0.15);
      outline: none;
    }
    .nav-search-bar i {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
    }
    .nav-links-list {
      display: flex;
      list-style: none;
      gap: 24px;
      margin: 0;
      padding: 0;
      align-items: center;
    }
    .nav-links-list a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 600;
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .nav-links-list a:hover, .nav-links-list a.active {
      color: var(--primary);
      background-color: var(--primary-light);
    }

    /* 按钮规范 */
    .btn-main {
      background: linear-gradient(135deg, var(--primary) 0%, #ff527b 100%);
      color: #fff;
      font-weight: 600;
      border: none;
      border-radius: 30px;
      padding: 10px 24px;
      transition: var(--transition);
      box-shadow: 0 6px 16px rgba(255,51,102,0.25);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .btn-main:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, #e02454 100%);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(255,51,102,0.35);
    }
    .btn-sub {
      background: #fff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      font-weight: 600;
      border-radius: 30px;
      padding: 10px 24px;
      transition: var(--transition);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-sub:hover {
      background: var(--bg-light);
      color: var(--primary);
      border-color: var(--primary);
    }

    /* 极简高端斜切 Hero */
    .hero-skew-wrap {
      background: linear-gradient(145deg, #0b0d14 0%, #171b29 100%);
      color: #fff;
      padding: 90px 0 140px;
      position: relative;
      clip-path: polygon(0 0, 100% 0, 100% 93%, 0 100%);
      overflow: hidden;
    }
    .hero-skew-wrap::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(255,51,102,0.18) 0%, rgba(121,40,202,0.05) 70%, transparent 100%);
      filter: blur(80px);
      pointer-events: none;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 51, 102, 0.15);
      border: 1px solid rgba(255, 51, 102, 0.3);
      color: #ff6b8b;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.22;
      letter-spacing: -1px;
      margin-bottom: 22px;
    }
    .hero-desc {
      font-size: 1.08rem;
      color: #a0aec0;
      line-height: 1.75;
      margin-bottom: 34px;
      max-width: 620px;
    }
    .hero-countdown-box {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .countdown-timer-group {
      display: flex;
      gap: 14px;
      margin-top: 14px;
    }
    .countdown-item {
      flex: 1;
      text-align: center;
      background: rgba(0, 0, 0, 0.4);
      padding: 12px 6px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255,255,255,0.06);
    }
    .countdown-val {
      font-size: 26px;
      font-weight: 800;
      color: #ff4d79;
      display: block;
      line-height: 1;
      font-feature-settings: "tnum";
    }
    .countdown-lbl {
      font-size: 12px;
      color: #718096;
      margin-top: 6px;
      display: block;
    }

    /* GEO 结构化结论框 */
    .geo-answer-block {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      border-left: 6px solid var(--primary);
      padding: 26px 30px;
      margin-top: -60px;
      position: relative;
      z-index: 10;
      box-shadow: var(--shadow-md);
    }
    .geo-tag {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 0.8px;
    }

    /* 通用板块与交替背景 */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-light);
    }
    .section-title-wrap {
      margin-bottom: 48px;
    }
    .section-subhead {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1.2px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .section-lead {
      color: var(--text-muted);
      font-size: 1.02rem;
      line-height: 1.7;
      max-width: 720px;
      margin: 0 auto;
    }

    /* 卡片通用体系 */
    .app-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .app-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(255, 51, 102, 0.3);
    }
    .app-card-img-top {
      position: relative;
      border-radius: calc(var(--radius-md) - 4px);
      overflow: hidden;
      margin-bottom: 18px;
      background: #e2e8f0;
      aspect-ratio: 16/9;
    }
    .app-card-img-top img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .app-card:hover .app-card-img-top img {
      transform: scale(1.05);
    }
    .card-meta-tag {
      position: absolute;
      top: 10px;
      left: 10px;
      background: rgba(15, 17, 26, 0.85);
      backdrop-filter: blur(4px);
      color: #fff;
      font-size: 11px;
      padding: 3px 10px;
      border-radius: 4px;
      font-weight: 600;
    }

    /* 指标看板与对比条 */
    .metric-card {
      border: 1px solid var(--border-color);
      background: #fff;
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition);
    }
    .metric-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    .metric-num {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-lbl {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 排行榜单 UI */
    .ranking-item-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 14px;
      transition: var(--transition);
    }
    .ranking-item-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .ranking-num {
      font-size: 20px;
      font-weight: 800;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      background: var(--bg-light);
      color: var(--text-main);
      flex-shrink: 0;
    }
    .ranking-num.gold { background: #fff5e6; color: #d97706; }
    .ranking-num.silver { background: #f1f5f9; color: #475569; }
    .ranking-num.bronze { background: #fef2f2; color: #b91c1c; }

    /* 标签云与索引 */
    .tag-bubble {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 18px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      color: var(--text-main);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      transition: var(--transition);
    }
    .tag-bubble:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    /* 口碑墙引用卡 */
    .review-bubble-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .review-bubble-card:hover {
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 51, 102, 0.4);
    }
    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
    }
    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 转化收口区 */
    .cta-final-band {
      background: linear-gradient(135deg, #0f111a 0%, #1e122b 100%);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 56px 40px;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
    }

    /* 统一页脚 */
    .site-footer {
      background-color: #0b0c10;
      color: #8c96a8;
      padding: 68px 0 28px;
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }
    .site-footer h5 {
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .site-footer ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .site-footer ul li {
      margin-bottom: 10px;
    }
    .site-footer ul li a {
      color: #8c96a8;
      text-decoration: none;
      transition: var(--transition);
    }
    .site-footer ul li a:hover {
      color: var(--primary);
    }
    .footer-bottom-copy {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      margin-top: 50px;
      font-size: 13px;
      color: #64748b;
    }

    @media (max-width: 991px) {
      .hero-h1 { font-size: 2.2rem; }
      .section-wrap { padding: 60px 0; }
      .nav-top-row { display: none; }
    }
    @media (max-width: 576px) {
      .hero-h1 { font-size: 1.85rem; }
      .hero-skew-wrap { clip-path: none; padding-bottom: 70px; }
      .geo-answer-block { margin-top: 20px; padding: 20px; }
      .countdown-timer-group { gap: 6px; }
      .countdown-val { font-size: 20px; }
    }