/* roulang page: index */
:root {
      --deep-green: #0A1A2F;
      --fluor-green: #00E676;
      --alert-red: #FF3D00;
      --soft-bg: #F5F7FA;
      --dark-section: #13293D;
      --white-glass: rgba(255, 255, 255, 0.1);
      --border-light: rgba(255, 255, 255, 0.2);
      --shadow-card: 0 8px 20px rgba(0,0,0,0.05);
      --shadow-hover: 0 20px 30px rgba(0,0,0,0.08);
      --radius-xl: 1.5rem;
      --radius-2xl: 2rem;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--soft-bg);
      margin: 0;
      line-height: 1.5;
      color: #1f2937;
      -webkit-font-smoothing: antialiased;
    }
    .glass-nav {
      background: rgba(10, 26, 47, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.2);
      transition: all 0.3s ease;
    }
    .nav-scrolled {
      background: rgba(10, 26, 47, 0.96);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 10px 25px -8px rgba(0,0,0,0.4);
    }
    .hero-grid-bg {
      background-image: 
        linear-gradient(rgba(10,26,47,0.88), rgba(19,41,61,0.92)),
        url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-grid-bg::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: 
        linear-gradient(90deg, rgba(0,230,118,0.08) 1px, transparent 1px),
        linear-gradient(0deg, rgba(0,230,118,0.08) 1px, transparent 1px);
      background-size: 48px 48px;
      pointer-events: none;
      mask-image: radial-gradient(circle at 30% 40%, black 20%, transparent 80%);
    }
    .data-particle {
      position: absolute;
      width: 6px;
      height: 6px;
      background: var(--fluor-green);
      border-radius: 50%;
      filter: blur(1px);
      opacity: 0.7;
      animation: floatParticle 8s infinite alternate ease-in-out;
    }
    @keyframes floatParticle {
      0% { transform: translate(0, 0) scale(1); opacity: 0.4; }
      100% { transform: translate(30px, -50px) scale(1.8); opacity: 0.9; }
    }
    .btn-primary {
      background-color: var(--fluor-green);
      color: var(--deep-green);
      font-weight: 700;
      padding: 0.85rem 2.2rem;
      border-radius: 9999px;
      box-shadow: 0 8px 18px rgba(0,230,118,0.3);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background-color: #00c853;
      box-shadow: 0 12px 24px rgba(0,230,118,0.5);
      transform: translateY(-2px);
    }
    .btn-outline-light {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.75);
      color: white;
      font-weight: 600;
      padding: 0.85rem 2.2rem;
      border-radius: 9999px;
      transition: all 0.3s ease;
      backdrop-filter: blur(4px);
    }
    .btn-outline-light:hover {
      background: white;
      color: var(--deep-green);
      border-color: white;
      transform: translateY(-2px);
    }
    .card-advantage {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(6px);
      border: 1px solid #edf2f7;
      border-radius: var(--radius-xl);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .card-advantage:hover {
      border-color: var(--fluor-green);
      box-shadow: 0 0 0 3px rgba(0,230,118,0.2), var(--shadow-hover);
      transform: translateY(-4px);
    }
    .data-badge {
      background: rgba(0,230,118,0.12);
      color: var(--deep-green);
      font-weight: 700;
      padding: 0.25rem 0.9rem;
      border-radius: 40px;
      font-size: 0.8rem;
      display: inline-block;
    }
    .accent-number {
      font-weight: 900;
      color: var(--fluor-green);
      font-size: 2.8rem;
      line-height: 1.1;
    }
    .faq-question h4 {
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      color: #4b5563;
      line-height: 1.7;
    }
    .footer-link:hover {
      color: var(--fluor-green);
    }
    @media (max-width: 768px) {
      .hero-grid-bg {
        background-position: 45% center;
      }
      .accent-number {
        font-size: 2.2rem;
      }
    }