/* roulang page: index */
@layer base {
      :root {
        --primary: #00C2FF;
        --accent: #A855F7;
        --highlight: #22D3EE;
        --bg-deep: #060B1A;
        --bg-card: rgba(15,23,42,0.7);
        --text-primary: #FFFFFF;
        --text-secondary: #CBD5E1;
        --text-muted: #94A3B8;
        --border-glow: rgba(0,194,255,0.15);
        --border-strong: rgba(0,194,255,0.4);
        --radius-lg: 16px;
        --radius-md: 12px;
        --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      }
      * {
        box-sizing: border-box;
      }
      body {
        margin: 0;
        font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, sans-serif;
        background: linear-gradient(135deg, #060B1A 0%, #0F172A 100%);
        color: var(--text-primary);
        line-height: 1.7;
        -webkit-font-smoothing: antialiased;
      }
      .glass-card {
        background: rgba(15,23,42,0.7);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        border: 1px solid var(--border-glow);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-card);
      }
      .text-glow-blue {
        color: var(--primary);
        text-shadow: 0 0 12px rgba(0,194,255,0.7);
      }
      .text-glow-purple {
        color: var(--accent);
        text-shadow: 0 0 12px rgba(168,85,247,0.7);
      }
      .border-neon-bottom {
        border-bottom: 1px solid rgba(0,194,255,0.3);
      }
      .animate-float {
        animation: float 6s ease-in-out infinite;
      }
      @keyframes float {
        0% { transform: translateY(0px); }
        50% { transform: translateY(-10px); }
        100% { transform: translateY(0px); }
      }
      .counter {
        font-variant-numeric: tabular-nums;
        font-feature-settings: "tnum";
      }
      .btn-glow {
        background: linear-gradient(135deg, #00C2FF 0%, #A855F7 100%);
        border: none;
        border-radius: var(--radius-md);
        color: white;
        font-weight: 600;
        padding: 0.75rem 2rem;
        transition: all 0.3s ease;
        box-shadow: 0 4px 15px rgba(0,194,255,0.3);
        display: inline-block;
        text-align: center;
      }
      .btn-glow:hover {
        box-shadow: 0 0 25px rgba(0,194,255,0.7), 0 0 15px rgba(168,85,247,0.5);
        transform: scale(1.03);
      }
      .btn-outline-glow {
        background: transparent;
        border: 1px solid rgba(0,194,255,0.4);
        border-radius: var(--radius-md);
        color: white;
        font-weight: 500;
        padding: 0.65rem 1.75rem;
        transition: all 0.3s ease;
      }
      .btn-outline-glow:hover {
        border-color: var(--primary);
        box-shadow: 0 0 15px rgba(0,194,255,0.4);
        background: rgba(0,194,255,0.05);
      }
      .nav-active {
        color: var(--primary) !important;
        border-bottom: 3px solid var(--primary);
        box-shadow: 0 0 10px rgba(0,194,255,0.5);
      }
      input, textarea {
        background: rgba(15,23,42,0.8);
        border: 1px solid rgba(0,194,255,0.25);
        border-radius: 12px;
        padding: 0.75rem 1rem;
        color: white;
        transition: 0.2s;
        width: 100%;
      }
      input:focus, textarea:focus {
        outline: none;
        border-color: var(--primary);
        box-shadow: 0 0 15px rgba(0,194,255,0.5);
      }
      .faq-item {
        border-bottom: 1px solid rgba(255,255,255,0.08);
      }
      details summary {
        list-style: none;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1.2rem 0;
        font-weight: 600;
        color: white;
      }
      details summary::-webkit-details-marker {
        display: none;
      }
      .icon-plus {
        transition: transform 0.3s ease;
        font-size: 1.5rem;
        color: var(--primary);
      }
      details[open] .icon-plus {
        transform: rotate(45deg);
      }
      @media (max-width: 768px) {
        .mobile-menu {
          display: none;
        }
        .mobile-menu.open {
          display: flex;
          flex-direction: column;
          background: rgba(6,11,26,0.95);
          backdrop-filter: blur(20px);
          position: absolute;
          top: 64px;
          left: 0;
          width: 100%;
          padding: 1.5rem;
          border-bottom: 1px solid var(--border-glow);
        }
      }