/* roulang page: index */
:root {
      --deep-purple: #1A0A2E;
      --electric-purple: #9D4EDD;
      --neon-cyan: #00F5D4;
      --card-bg: rgba(255, 255, 255, 0.05);
      --card-border: rgba(255, 255, 255, 0.12);
      --text-primary: rgba(255, 255, 255, 0.88);
      --text-secondary: rgba(255, 255, 255, 0.62);
      --dark-bg: #120720;
      --footer-bg: #0A0412;
      --gradient-btn: linear-gradient(135deg, #9D4EDD 0%, #00F5D4 100%);
      --glow-purple: 0 0 20px rgba(157, 78, 221, 0.5);
      --glow-cyan: 0 0 40px rgba(0, 245, 212, 0.25);
      --radius-card: 20px;
      --radius-btn: 14px;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-purple);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 玻璃拟态基础 */
    .glass-card {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-card);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
      transition: var(--transition);
    }

    .glass-card:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(255, 255, 255, 0.2);
      transform: translateY(-6px);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(157, 78, 221, 0.3);
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 10, 46, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.75rem 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 1.7rem;
      font-weight: 700;
      color: white;
      text-decoration: none;
      letter-spacing: 1px;
    }

    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--gradient-btn);
      width: 40px;
      height: 40px;
      border-radius: 12px;
      font-size: 1.5rem;
      color: #1A0A2E;
      box-shadow: var(--glow-purple);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      color: rgba(255, 255, 255, 0.78);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover {
      color: var(--neon-cyan);
    }

    .btn-cta-nav {
      background: var(--gradient-btn);
      border: none;
      color: #0A0412;
      font-weight: 700;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      box-shadow: var(--glow-purple), var(--glow-cyan);
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      cursor: pointer;
    }

    .btn-cta-nav:hover {
      filter: brightness(1.2);
      transform: scale(1.02);
      color: #0A0412;
    }

    .hamburger {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }

    /* Hero 区域 */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(circle at 20% 30%, #2a1240 0%, #0f051c 90%);
      position: relative;
      overflow: hidden;
      padding: 6rem 2rem 4rem;
    }

    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      max-width: 1200px;
      width: 100%;
      gap: 2.5rem;
    }

    .hero-text {
      flex: 1 1 400px;
    }

    .hero-text h1 {
      font-size: clamp(2.8rem, 7vw, 4.4rem);
      font-weight: 700;
      background: linear-gradient(to right, #9D4EDD, #00F5D4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.2rem;
      line-height: 1.2;
    }

    .hero-text .subtitle {
      font-size: 1.3rem;
      color: rgba(255, 255, 255, 0.72);
      margin-bottom: 2.5rem;
      max-width: 550px;
    }

    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--gradient-btn);
      border: none;
      color: #0A0412;
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      box-shadow: var(--glow-purple), var(--glow-cyan);
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      cursor: pointer;
    }

    .btn-primary:hover {
      filter: brightness(1.2);
      transform: translateY(-2px);
      color: #0A0412;
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--neon-cyan);
      color: var(--neon-cyan);
      font-weight: 600;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      transition: var(--transition);
      text-decoration: none;
    }

    .btn-secondary:hover {
      background: rgba(0, 245, 212, 0.12);
      border-color: white;
      color: white;
    }

    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 28px;
      box-shadow: 0 25px 50px rgba(0, 0, 0, 0.7);
      filter: drop-shadow(0 0 25px rgba(157, 78, 221, 0.4));
    }

    /* 通用区块 */
    .section {
      padding: 5rem 2rem;
      max-width: 1200px;
      margin: 0 auto;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      text-align: center;
      margin-bottom: 3rem;
      color: white;
    }

    /* 功能卡片网格 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }

    .feature-item {
      padding: 2rem;
      text-align: left;
    }

    .feature-icon {
      font-size: 2.8rem;
      color: var(--neon-cyan);
      margin-bottom: 1.3rem;
      filter: drop-shadow(0 0 12px #00f5d4aa);
    }

    .feature-item h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }

    /* 产品分组 左右交错 */
    .product-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

    .product-img {
      flex: 1 1 280px;
    }

    .product-img img {
      width: 100%;
      border-radius: 24px;
    }

    .product-desc {
      flex: 1 1 300px;
    }

    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }

    .scenario-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 18px 18px 0 0;
    }

    .scenario-card .card-content {
      padding: 1.6rem;
    }

    /* 案例数据 */
    .cases-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 2.5rem;
      align-items: center;
    }

    .stats {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--neon-cyan);
    }

    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 2rem;
      align-items: start;
    }

    .pricing-card {
      padding: 2.2rem;
      position: relative;
    }

    .pricing-card.recommended {
      border: 2px solid var(--neon-cyan);
      box-shadow: 0 0 30px #00f5d440;
      transform: scale(1.02);
    }

    .badge {
      background: var(--electric-purple);
      color: white;
      padding: 0.3rem 1.2rem;
      border-radius: 30px;
      font-size: 0.8rem;
      position: absolute;
      top: -14px;
      right: 20px;
    }

    .price {
      font-size: 3rem;
      font-weight: 700;
      color: var(--neon-cyan);
    }

    /* FAQ */
    .accordion-title {
      background: transparent;
      color: white;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .accordion-content {
      background: rgba(255,255,255,0.03);
      color: rgba(255,255,255,0.8);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #0D0618;
      padding: 5rem 2rem;
      text-align: center;
    }

    /* 页脚 */
    .site-footer {
      background: var(--footer-bg);
      padding: 3rem 2rem;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        background: #1A0A2E;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 1.5rem;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
    }