/* roulang page: index */
:root {
      --primary: #00C2FF;
      --accent: #00E5A1;
      --secondary: #7B61FF;
      --bg-deep: #0A0E1A;
      --bg-card: rgba(255, 255, 255, 0.04);
      --border-card: rgba(255, 255, 255, 0.08);
      --text-white: #FFFFFF;
      --text-light: #B0C4DE;
      --text-muted: #6B7B8D;
      --radius-lg: 16px;
      --radius-pill: 30px;
      --shadow-glow: 0 8px 32px rgba(0,0,0,0.4);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: 0.3s ease;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-light);
      font-family: var(--font-sans);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .grid-container {
      max-width: 1200px;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition-smooth);
    }
    a:hover {
      color: var(--accent);
    }

    h1, h2, h3, h4 {
      color: var(--text-white);
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: clamp(2.2rem, 5vw, 3rem);
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 1rem;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.2rem);
      margin-bottom: 2.5rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 3px;
      background: var(--accent);
      border-radius: 3px;
    }
    h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    .section-padding {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 3.5rem 0;
      }
    }

    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-glow);
      transition: all var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: var(--primary);
      box-shadow: 0 12px 40px rgba(0,194,255,0.2);
      transform: translateY(-4px);
    }

    .btn-primary {
      background: var(--accent);
      color: var(--bg-deep);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-pill);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-smooth);
      box-shadow: 0 0 12px rgba(0,229,161,0.3);
      letter-spacing: 0.3px;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #00f0b5;
      box-shadow: 0 0 24px rgba(0,229,161,0.7);
      transform: scale(1.03);
      color: var(--bg-deep);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-pill);
      font-weight: 500;
      transition: all var(--transition-smooth);
      backdrop-filter: blur(4px);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: rgba(255,255,255,0.08);
      color: white;
    }

    /* 导航 */
    .wm-nav {
      background: rgba(10,14,26,0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 0.75rem 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 99;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    .nav-link {
      color: var(--text-light);
      margin: 0 0.8rem;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 50%;
      background: var(--primary);
      transition: 0.3s ease;
      transform: translateX(-50%);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-link:hover {
      color: white;
    }
    .cta-badge {
      background: rgba(0,229,161,0.15);
      color: var(--accent);
      padding: 0.2rem 0.7rem;
      border-radius: 20px;
      font-size: 0.75rem;
      margin-left: 6px;
      font-weight: 600;
    }

    .mobile-menu-icon {
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 30%, #1a2340, #0A0E1A);
      position: relative;
      overflow: hidden;
      padding-top: 70px;
    }
    .hero-bg-effect {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      pointer-events: none;
    }
    .metric-card {
      background: rgba(10,14,26,0.6);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 1rem 1.2rem;
      text-align: center;
      min-width: 140px;
    }
    .metric-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 0.75rem;
      color: var(--text-muted);
      text-transform: uppercase;
    }

    /* 服务卡片 */
    .service-card {
      padding: 2rem 1.5rem;
      height: 100%;
    }
    .icon-glow {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }

    /* 对比表 */
    .compare-table {
      background: var(--bg-card);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .compare-row {
      display: flex;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .compare-cell {
      flex: 1;
      padding: 1rem 1.5rem;
      font-size: 0.95rem;
    }
    .compare-header {
      background: rgba(0,194,255,0.08);
      font-weight: 700;
      color: white;
    }
    .highlight {
      color: var(--accent);
      font-weight: 600;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      padding: 1.2rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-light);
      line-height: 1.7;
    }
    .accordion-content.open {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }

    footer {
      background: #060912;
      padding: 2.5rem 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .mobile-nav-links {
        display: none;
        flex-direction: column;
        background: rgba(10,14,26,0.95);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 1rem 2rem;
      }
      .mobile-nav-links.show {
        display: flex;
      }
    }