/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-hover: #69F0AE;
      --accent-red: #FF1744;
      --bg-deep: #0B0E14;
      --bg-card: #1E2532;
      --bg-light: #F5F6FA;
      --text-white: #FFFFFF;
      --text-body: #E0E4EB;
      --text-muted: #9AA0B0;
      --text-dark: #0B0E14;
      --border-light: rgba(255,255,255,0.06);
      --border-card: 1px solid rgba(255,255,255,0.08);
      --border-input: #2A3140;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.2s ease;
      --max-width: 1200px;
      --section-gap: 100px;
      --card-padding: 24px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11,14,20,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo img {
      width: 32px;
      height: 32px;
      border-radius: 6px;
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      color: #B0B8C5;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 6px 0;
      letter-spacing: 0.3px;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--bg-deep);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-size: 15px;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-size: 15px;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.08);
    }
    .mobile-menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 8px;
    }
    .mobile-menu-toggle span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 70px;
      background: radial-gradient(circle at 30% 40%, #0f2818 0%, var(--bg-deep) 80%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-content p {
      font-size: 18px;
      color: #B0B8C5;
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      position: relative;
      background: rgba(30,37,50,0.7);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 380px;
      backdrop-filter: blur(4px);
    }
    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
      opacity: 0.9;
    }
    .live-dot {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--accent-red);
      color: white;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; }
      50% { opacity: 0.6; }
      100% { opacity: 1; }
    }
    /* 板块通用 */
    .section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: white;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }
    /* 核心优势 非对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .feature-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: var(--card-padding);
      border: var(--border-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition);
    }
    .feature-item:hover {
      border-color: var(--primary);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--primary);
    }
    .feature-text h3 {
      font-size: 20px;
      font-weight: 600;
      color: white;
      margin-bottom: 8px;
    }
    .feature-text p {
      color: var(--text-muted);
      font-size: 15px;
    }
    /* 功能分组 左右交替 */
    .detail-block {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .detail-block.reverse {
      flex-direction: row-reverse;
    }
    .detail-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      background: #1A1F2A;
    }
    .detail-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .detail-content {
      flex: 1;
    }
    .detail-content h3 {
      font-size: 28px;
      font-weight: 600;
      color: white;
      margin-bottom: 16px;
    }
    .detail-content p {
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      color: #E0E4EB;
      margin-bottom: 10px;
      font-size: 15px;
    }
    .feature-list li::before {
      content: '●';
      color: var(--primary);
      font-size: 18px;
    }
    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      border: var(--border-card);
      transition: var(--transition);
    }
    .scenario-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
    }
    .scenario-img {
      width: 100%;
      height: 120px;
      background: #2A3140;
      border-radius: var(--radius-sm);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scenario-card h3 {
      font-size: 18px;
      font-weight: 600;
      color: white;
    }
    /* 数据案例 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin-bottom: 50px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      font-feature-settings: "tnum";
      letter-spacing: 1px;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 14px;
    }
    .partner-wall {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      opacity: 0.6;
    }
    .partner-placeholder {
      width: 100px;
      height: 40px;
      background: #2A3140;
      border-radius: 4px;
    }
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      border: 1px solid #E8ECF1;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.02);
      background: white;
      position: relative;
    }
    .pricing-badge {
      background: var(--accent-red);
      color: white;
      font-size: 12px;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      font-weight: 600;
    }
    .price {
      font-size: 36px;
      font-weight: 700;
      color: var(--bg-deep);
      margin: 16px 0;
    }
    .pricing-features {
      list-style: none;
      text-align: left;
      margin: 20px 0;
      color: #5A6270;
    }
    .pricing-features li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      border: 1px solid #E8ECF1;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--bg-deep);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: #5A6270;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 20px;
      transition: var(--transition);
    }
    /* CTA */
    .cta-band {
      background: var(--bg-deep);
      text-align: center;
      padding: 80px 20px;
      border-top: 1px solid var(--border-light);
    }
    .cta-band h2 {
      font-size: 40px;
      color: white;
      margin-bottom: 16px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
      border-top: 1px solid var(--border-light);
    }
    .footer-col p {
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 8px;
      font-size: 14px;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .copyright {
      text-align: center;
      color: #5A6270;
      font-size: 12px;
      padding: 24px 0;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(11,14,20,0.98);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
      }
      .mobile-menu.open {
        display: flex;
      }
      .features-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .detail-block, .detail-block.reverse {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 28px;
      }
    }