/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-card: rgba(15, 25, 50, 0.7);
      --primary-cyan: #00E5FF;
      --accent-orange: #FF6B35;
      --text-main: #F0F4FF;
      --text-muted: #A0B3D9;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 229, 255, 0.25);
      --shadow-card: 0 20px 35px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255,255,255,0.06);
      --radius-card: 16px;
      --radius-btn: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-main);
      line-height: 1.7;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: transparent;
    }
    /* 背景纹理：抽象足球场网格 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 229, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.02) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 14, 39, 0.92);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.3s, backdrop-filter 0.3s;
    }
    .header.scrolled {
      background: rgba(8, 12, 32, 0.85);
      backdrop-filter: blur(18px);
    }
    .nav-brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 56px;
      padding: 0 24px;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--primary-cyan);
      font-size: 26px;
    }
    .trend-tags {
      display: flex;
      gap: 10px;
      align-items: center;
    }
    .trend-tag {
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-light);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-muted);
      transition: var(--transition);
      white-space: nowrap;
    }
    .trend-tag:hover {
      border-color: var(--primary-cyan);
      color: var(--primary-cyan);
    }
    .search-icon {
      font-size: 18px;
      color: var(--text-muted);
      margin-left: 8px;
      cursor: pointer;
    }
    .channel-row {
      display: flex;
      justify-content: center;
      gap: 32px;
      padding: 8px 0 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      border-top: 1px solid rgba(255,255,255,0.04);
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .channel-row a {
      position: relative;
      padding-bottom: 4px;
    }
    .channel-row a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      transition: width 0.25s ease;
    }
    .channel-row a:hover::after,
    .channel-row a.active::after {
      width: 100%;
    }
    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      color: white;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      position: relative;
      z-index: 2;
      background: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-left .subtitle {
      font-size: 20px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-cyan);
      color: #0A0E27;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 20px rgba(0,229,255,0.5);
      transition: var(--transition);
      border: none;
      font-size: 16px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.8);
      background: #33f0ff;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      border-color: #fff;
      color: #fff;
    }
    .hero-right {
      flex: 1;
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: 24px;
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .live-stat {
      display: flex;
      justify-content: space-between;
    }
    .stat-digit {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary-cyan);
      text-shadow: 0 0 12px rgba(0,229,255,0.7);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .glass-card:hover {
      border-color: rgba(255,255,255,0.2);
      transform: translateY(-4px);
    }
    /* 痛点卡片 */
    .pain-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .pain-item {
      flex: 1;
      min-width: 250px;
    }
    /* 解决方案卡片特性列表 */
    .feature-list {
      list-style: none;
      margin-top: 16px;
    }
    .feature-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .feature-list li i {
      color: var(--primary-cyan);
      font-size: 12px;
    }
    .card-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--primary-cyan);
      font-weight: 600;
      margin-top: 20px;
    }
    .card-link i {
      transition: transform 0.2s;
    }
    .glass-card:hover .card-link i {
      transform: translateX(4px);
    }
    /* 数据看板 */
    .dashboard {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      background: rgba(0,0,0,0.3);
      backdrop-filter: blur(14px);
      border-radius: 24px;
      padding: 48px 24px;
      border:1px solid var(--border-light);
    }
    .db-item {
      text-align: center;
    }
    .db-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--primary-cyan);
      text-shadow: 0 0 18px #00e5ff;
    }
    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 24px;
    }
    .testimonial-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      border:1px solid var(--border-light);
      border-radius: 20px;
      padding: 28px;
      position: relative;
    }
    .quote-icon {
      font-size: 48px;
      color: rgba(0,229,255,0.2);
      position: absolute;
      top: 16px;
      left: 20px;
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border:1px solid var(--border-light);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      text-align: center;
      background: radial-gradient(circle at center, rgba(0,229,255,0.1) 0%, transparent 70%);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
    }
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 10px;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: var(--text-muted);
    }
    .copyright {
      text-align: center;
      font-size: 13px;
      color: #5a6a8c;
      border-top: 1px solid var(--border-light);
      padding: 20px 0;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .channel-row, .trend-tags { display: none; }
      .mobile-menu-btn { display: block; }
      .hero-left h1 { font-size: 32px; }
      .grid-3, .testimonial-grid, .footer-grid { grid-template-columns: 1fr; }
      .pain-grid { flex-direction: column; }
      .dashboard { gap: 24px; }
      .db-number { font-size: 40px; }
    }