/* 主题：暗色赛博安全风，霓虹高光与玻璃拟态 */
:root {
  --bg: #f7fbff;
  --panel: rgba(255, 255, 255, 0.85);
  --border: #e6eef5;
  --text: #14202b;
  --muted: #5b6d7a;
  --primary: #0d8aff;
  --primary-2: #6c5ce7;
  --accent: #1f9e8f;
  --shadow: 0 10px 30px rgba(13, 138, 255, 0.18);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "PingFang SC", "Microsoft Yahei", "Noto Sans", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 1200px at 10% 10%, rgba(13, 138, 255, 0.08), transparent 60%),
              radial-gradient(800px 800px at 90% 20%, rgba(108, 92, 231, 0.10), transparent 60%),
              var(--bg);
}

.container { width: min(1120px, 92vw); margin: 0 auto; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 100; backdrop-filter: saturate(1.4) blur(10px); background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.6)); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 600; letter-spacing: 0.2px; }
.brand img { width: 28px; height: 28px; filter: drop-shadow(0 2px 12px rgba(13, 138, 255, 0.25)); }
.nav { display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: 10px; transition: 200ms ease; }
.nav a:hover { color: var(--text); background: rgba(0, 0, 0, 0.06); }

/* Buttons */
.btn { display: inline-block; text-decoration: none; border-radius: 12px; padding: 12px 18px; font-weight: 600; letter-spacing: 0.3px; transition: 200ms ease; }
.btn-primary { color: #ffffff; background: linear-gradient(90deg, var(--primary), #2dd4ff); box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.06); }
.btn-outline { border: 1px solid var(--border); color: var(--text); background: rgba(255, 255, 255, 0.8); }
.btn-outline:hover { border-color: rgba(0, 0, 0, 0.15); background: rgba(0, 0, 0, 0.04); }
.btn-ghost { color: var(--primary); border: 1px dashed rgba(13, 138, 255, 0.35); background: rgba(13, 138, 255, 0.06); }
.btn-lg { padding: 14px 24px; font-size: 18px; }

/* Hero */
.hero { position: relative; padding: 110px 0 80px; overflow: hidden; }
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(transparent 95%, rgba(13, 138, 255, 0.08) 95%), linear-gradient(90deg, transparent 95%, rgba(108, 92, 231, 0.08) 95%); background-size: 30px 30px; opacity: 0.25; animation: gridMove 14s linear infinite; }
@keyframes gridMove { from { transform: translateY(0); } to { transform: translateY(-30px); } }
.hero-inner { position: relative; }
.hero h1 { font-size: clamp(30px, 6vw, 54px); margin: 0 0 10px; letter-spacing: 0.6px; }
.subtitle { color: var(--muted); font-size: clamp(16px, 2.8vw, 20px); margin: 0 0 14px; }
.lead { color: var(--muted); max-width: 860px; line-height: 1.8; margin: 0 0 20px; }
.hero-actions { display: flex; gap: 12px; margin: 28px 0 36px; }

.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 18px; box-shadow: 0 6px 18px rgba(0,0,0,0.25); }
.stat-value { font-size: 28px; font-weight: 700; color: var(--primary); text-shadow: 0 2px 18px rgba(13, 138, 255, 0.2); }
.stat-label { color: var(--muted); font-size: 14px; margin-top: 6px; }

/* Sections */
.section { padding: 72px 0; }
.section-alt { padding: 72px 0; background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: clamp(22px, 4vw, 32px); margin: 0 0 26px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 20px; transition: 200ms ease; }
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.feature-card h3 { margin: 0 0 8px; font-size: 18px; }
.feature-card p { margin: 0; color: var(--muted); line-height: 1.8; }

.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.adv-card { background: linear-gradient(180deg, rgba(13, 138, 255, 0.06), rgba(108, 92, 231, 0.06)); border: 1px solid var(--border); border-radius: 16px; padding: 20px; position: relative; }
.adv-card::after { content: ""; position: absolute; inset: 0; border-radius: 16px; pointer-events: none; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05), 0 20px 60px rgba(14, 231, 255, 0.08); }
.adv-card h3 { margin: 0 0 8px; font-size: 18px; color: var(--accent); }
.adv-card p { margin: 0; color: var(--muted); line-height: 1.8; }

.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.platform-card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 18px; text-align: center; }
.platform-icon { font-size: 26px; margin-bottom: 8px; }

/* CTA */
.cta { padding: 80px 0; background: radial-gradient(500px 500px at 50% 0%, rgba(13, 138, 255, 0.12), transparent 60%); border-top: 1px solid var(--border); }
.cta-inner { text-align: center; }
.cta h2 { margin: 0 0 12px; }
.cta p { color: var(--muted); margin: 0 0 18px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(10px); }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 14px; padding: 18px 0; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; }
.footer-brand img { width: 24px; height: 24px; }
.footer-links a { color: var(--muted); text-decoration: none; margin-right: 12px; }
.footer-links a:hover { color: var(--text); }
.footer-copy { color: var(--muted); }

/* Reveal Animations */
[data-reveal] { opacity: 0; transform: translateY(10px); transition: 600ms ease; }
[data-reveal].in-view { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 960px) {
  .feature-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .header-inner { padding: 10px 0; }
  .nav { gap: 8px; }
  .hero { padding: 90px 0 64px; }
  .stats { grid-template-columns: 1fr; }
  .feature-grid, .adv-grid, .platform-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
}