:root {
  --bg: #070b14;
  --panel: rgba(255, 255, 255, 0.04);
  --line: rgba(255, 255, 255, 0.12);
  --text: #e6edf7;
  --muted: #9cabbe;
  --accent: #69b4ff;
  --accent-2: #4ce5c0;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --max-width: 1200px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 10% -10%, #16253f 0%, transparent 36%), radial-gradient(circle at 90% 0%, #102c3d 0%, transparent 28%), var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}
.bg-glow { position: fixed; inset: auto auto -180px -180px; width: 460px; height: 460px; background: radial-gradient(circle, rgba(105,180,255,.22), transparent 70%); filter: blur(6px); z-index: -2; }
.bg-grid { position: fixed; inset: 0; background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px); background-size: 42px 42px; mask-image: radial-gradient(circle at 50% 30%, black 35%, transparent 78%); z-index: -3; pointer-events: none; }
.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 12px; top: 12px; background: #fff; color: #000; padding: 8px 12px; border-radius: 10px; z-index: 999; }
.container { width: min(100% - 40px, var(--max-width)); margin: 0 auto; }
.section { padding: 96px 0; }
.site-header { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(10px); background: rgba(7,11,20,.64); border-bottom: 1px solid rgba(255,255,255,.06); }
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { font-size: 1.1rem; letter-spacing: .08em; font-weight: 700; color: var(--text); text-decoration: none; }
.site-nav { display: flex; gap: 24px; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: .96rem; transition: color .25s ease; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--text); }
.menu-toggle { display: none; background: transparent; border: 1px solid var(--line); border-radius: 10px; width: 42px; height: 42px; padding: 0; }
.menu-toggle span { display: block; width: 18px; height: 2px; border-radius: 10px; margin: 4px auto; background: var(--text); }
.hero { min-height: calc(100vh - 72px); display: flex; align-items: center; padding-top: 56px; }
.hero-content { max-width: 840px; }
.eyebrow { margin: 0; color: var(--accent-2); letter-spacing: .12em; text-transform: uppercase; font-size: .82rem; }
h1, h2, h3 { line-height: 1.2; margin-top: 0; }
h1 { font-size: clamp(2rem, 4.4vw, 4rem); margin: 16px 0 18px; }
.subtitle { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--muted); max-width: 760px; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { text-decoration: none; border-radius: 999px; padding: 12px 22px; font-weight: 600; font-size: .95rem; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease, background-color .25s ease; }
.btn-primary { color: #071019; background: linear-gradient(90deg, var(--accent), #8cc3ff); box-shadow: 0 12px 28px rgba(105,180,255,.34); }
.btn-primary:hover, .btn-primary:focus-visible { transform: translateY(-1px); box-shadow: 0 16px 30px rgba(105,180,255,.42); }
.btn-secondary { color: var(--text); background: rgba(255,255,255,.02); border: 1px solid var(--line); }
.btn-secondary:hover, .btn-secondary:focus-visible { transform: translateY(-1px); border-color: rgba(255,255,255,.28); }
.section-label { color: var(--accent); font-size: .9rem; margin-top: 0; margin-bottom: 8px; }
.split { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.split p { margin: 0; color: var(--muted); }
.cards { margin-top: 28px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); transition: transform .25s ease, border-color .25s ease, background-color .25s ease; }
.card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card:hover { transform: translateY(-4px); border-color: rgba(105,180,255,.45); background: rgba(255,255,255,.065); }
.site-footer { border-top: 1px solid rgba(255,255,255,.08); padding-top: 48px; padding-bottom: 56px; }
.footer-content { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-content p { margin: 6px 0; color: var(--muted); }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (max-width: 920px) {
  .section { padding: 76px 0; }
  .split { grid-template-columns: 1fr; gap: 20px; }
  .cards { grid-template-columns: 1fr; }
  .menu-toggle { display: inline-block; }
  .site-nav { position: absolute; top: 72px; right: 20px; left: 20px; display: grid; gap: 10px; padding: 16px; border-radius: 14px; background: rgba(10,15,25,.97); border: 1px solid var(--line); transform-origin: top; transform: scaleY(.92); opacity: 0; pointer-events: none; transition: opacity .22s ease, transform .22s ease; }
  .site-nav.open { opacity: 1; transform: scaleY(1); pointer-events: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .btn, .card, .site-nav { transition: none; }
}