/* roulang page: index */
/* reset & base */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: #0A0E14;
      color: #B0C4D9;
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; transition: color 0.2s ease; }
    ul { list-style: none; padding: 0; margin: 0; }

    :root {
      --bg-deep: #0A0E14;
      --accent-cyan: #00F0B4;
      --accent-orange: #FF6B2B;
      --live-red: #E53935;
      --card-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4D9;
      --text-muted: #6B7D8E;
      --divider: rgba(255,255,255,0.06);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 8px;
      --shadow-card: 0 10px 32px rgba(0,0,0,0.5);
      --transition-fast: 200ms ease-out;
    }

    body { background: radial-gradient(circle at 20% 20%, #0d1a26, #0A0E14 70%); }
    .texture-layer {
      position: fixed; top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:3;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.06"><line x1="10" y1="0" x2="10" y2="100" stroke="%23ffffff" stroke-width="0.3"/><line x1="30" y1="0" x2="30" y2="100" stroke="%23ffffff" stroke-width="0.3"/><line x1="50" y1="0" x2="50" y2="100" stroke="%23ffffff" stroke-width="0.3"/><line x1="70" y1="0" x2="70" y2="100" stroke="%23ffffff" stroke-width="0.3"/><line x1="90" y1="0" x2="90" y2="100" stroke="%23ffffff" stroke-width="0.3"/><line x1="0" y1="20" x2="100" y2="20" stroke="%23ffffff" stroke-width="0.3"/><line x1="0" y1="40" x2="100" y2="40" stroke="%23ffffff" stroke-width="0.3"/><line x1="0" y1="60" x2="100" y2="60" stroke="%23ffffff" stroke-width="0.3"/><line x1="0" y1="80" x2="100" y2="80" stroke="%23ffffff" stroke-width="0.3"/></svg>');
      background-size: 100px 100px;
    }

    .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 5; }
    @media (max-width: 768px) { .container { padding: 0 16px; } }

    /* 字体字体子体 */
    .nav-number, .digit-font { font-family: 'DIN Alternate', 'Bebas Neue', 'Oswald', sans-serif; letter-spacing: -0.02em; }

    /* 按钮 */
    .btn-primary {
      background: #00F0B4; color: #0A0E14; font-weight: 600; padding: 14px 36px;
      border-radius: 8px; border: none; display: inline-flex; align-items: center; justify-content: center;
      transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
      cursor: pointer; font-size: 16px; letter-spacing: 0.5px;
    }
    .btn-primary:hover { background: #00FFC8; box-shadow: 0 0 20px rgba(0,240,180,0.45); transform: scale(1.02); color: #0A0E14; }
    .btn-outline {
      background: transparent; border: 1px solid #00F0B4; color: #00F0B4; padding: 14px 36px;
      border-radius: 8px; font-weight: 600; transition: all var(--transition-fast);
    }
    .btn-outline:hover { background: rgba(0,240,180,0.08); border-color: #00FFC8; color: #00FFC8; }
    .btn-glow { animation: pulseGlow 1.8s infinite ease-in-out; }
    @keyframes pulseGlow {
      0%,100% { box-shadow: 0 0 12px rgba(0,240,180,0.3); }
      50% { box-shadow: 0 0 28px rgba(0,240,180,0.65); }
    }
    @media (prefers-reduced-motion: reduce) {
      .btn-glow { animation: none; box-shadow: 0 0 12px rgba(0,240,180,0.3); }
    }

    /* 导航 */
    .navbar {
      position: fixed; top:0; left:0; width:100%; z-index:100;
      background: transparent; backdrop-filter: blur(0); transition: all 0.25s ease;
      padding: 16px 0;
    }
    .navbar.scrolled { background: rgba(10,14,20,0.92); backdrop-filter: blur(20px); box-shadow: 0 4px 20px rgba(0,0,0,0.6); }
    .nav-container { display: flex; align-items: center; justify-content: space-between; }
    .logo { font-size: 28px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 6px; }
    .logo i { color: #00F0B4; font-size: 28px; }
    .nav-links { display: flex; gap: 36px; align-items: center; font-weight: 500; }
    .nav-links a { color: #B0C4D9; padding: 6px 0; position: relative; }
    .nav-links a:hover, .nav-links a.active { color: #fff; }
    .nav-links a::after { content:''; position: absolute; bottom:-2px; left:0; width:0%; height:2px; background:#00F0B4; transition:0.2s; }
    .nav-links a:hover::after { width:100%; }
    .hamburger { display: none; background: transparent; border: none; color: #fff; font-size: 28px; cursor: pointer; }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-links { position: fixed; top:0; right:-100%; width:70%; height:100vh; background: rgba(10,14,20,0.96); backdrop-filter: blur(30px);
        flex-direction: column; justify-content: center; gap: 36px; transition: right 0.3s ease; font-size: 20px; }
      .nav-links.open { right:0; }
      .nav-links a { font-size: 22px; }
    }

    /* hero */
    .hero-section { min-height: 85vh; display: flex; align-items: center; padding-top: 90px; position: relative; }
    .hero-grid { display: flex; align-items: center; gap: 60px; }
    .hero-text { flex:1.1; }
    .hero-badge { display: inline-block; background: rgba(255,107,43,0.15); color: #FF6B2B; padding: 6px 16px; border-radius: 20px; font-size: 14px; margin-bottom: 18px; }
    h1 { font-size: 48px; font-weight: 700; color: #fff; line-height: 1.2; margin-bottom: 16px; }
    .hero-subtitle { font-size: 18px; color: #B0C4D9; margin-bottom: 32px; max-width: 540px; }
    .hero-image { flex:0.9; position: relative; background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat; border-radius: 20px; overflow: hidden; filter: brightness(0.75); box-shadow: 0 0 40px rgba(0,240,180,0.25); aspect-ratio: 16/9; width:100%; }
    .hero-image img { visibility: hidden; width:100%; height: auto; aspect-ratio: 16/9; }
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; text-align: center; gap:40px; }
      .hero-text { order:1; display: flex; flex-direction: column; align-items: center; }
      h1 { font-size: 36px; }
      .hero-subtitle { margin-bottom: 30px; max-width: 500px; }
    }

    section { padding: 100px 0; position: relative; z-index: 10; }
    h2 { font-size: 36px; font-weight: 700; color:#fff; margin-bottom: 16px; letter-spacing: -0.3px; }
    .section-intro { color: #B0C4D9; max-width: 660px; margin-bottom: 48px; font-size: 18px; }

    .cards-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
    @media (max-width: 1024px) { .cards-grid { grid-template-columns: repeat(2,1fr); } }
    @media (max-width: 520px) { .cards-grid { grid-template-columns: 1fr; } }

    .glass-card { background: rgba(255,255,255,0.03); backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,0.08);
      border-radius: 16px; padding: 28px; transition: all 0.2s ease; color: #B0C4D9; }
    .glass-card:hover { background: rgba(255,255,255,0.07); border-color: rgba(255,255,255,0.14); transform: translateY(-4px); }
    .card-icon { color: #00F0B4; font-size: 38px; margin-bottom: 20px; }
    .card h3 { color: #fff; font-size: 22px; margin-bottom: 12px; }

    .img-card img { border-radius: 14px; aspect-ratio: 16/9; object-fit: cover; width:100%; height:auto; filter: brightness(0.75); transition: 0.3s; }
    .img-card:hover img { filter: brightness(0.9); }
    .stats-row { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; margin-top: 20px; }
    .stat-item .big-num { font-size: 56px; font-weight: 700; color: #00F0B4; }
    .testimonial-grid { display: grid; grid-template-columns: repeat(3,1fr); gap:32px; }
    @media (max-width: 768px) { .testimonial-grid { grid-template-columns: 1fr; } }

    .faq-item { border-bottom: 1px solid var(--divider); }
    .faq-question { width:100%; background: transparent; border: none; padding: 22px 0; font-size: 20px; color:#fff; display: flex; justify-content: space-between; align-items: center; cursor: pointer; text-align: left; }
    .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.25s ease; color:#B0C4D9; }
    .faq-answer.open { max-height: 200px; padding-bottom: 18px; }
    .cta-banner { background: rgba(255,255,255,0.02); backdrop-filter: blur(16px); border:1px solid rgba(255,255,255,0.1); border-radius: 32px; padding: 72px 32px; text-align: center; }
    footer { border-top:1px solid var(--divider); padding: 48px 0; color: var(--text-muted); }