@charset "UTF-8";

:root {
  --bg: #060b15;
  --surface: rgba(13, 27, 48, .72);
  --text: #eaf6ff;
  --muted: #9cb5c9;
  --line: rgba(136, 199, 222, .18);
  --accent: #62e9ff;
  --max-width: 1120px;
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 4%, rgba(24, 110, 160, .28), transparent 30rem),
    radial-gradient(circle at 15% 40%, rgba(45, 117, 154, .12), transparent 26rem),
    var(--bg);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
h1, p { margin-top: 0; }
h1 { line-height: 1.2; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }

.site-header, .hero, .site-footer { width: min(calc(100% - 3rem), var(--max-width)); margin-inline: auto; }
.site-header { display: flex; align-items: center; min-height: 76px; }
.brand { font-size: 1.1rem; font-weight: 850; letter-spacing: .12em; }
.brand span { color: var(--accent); }
main { display: flex; flex: 1; align-items: center; padding-block: clamp(.75rem, 3vh, 2rem); }
.hero { display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: clamp(2rem, 6vw, 5rem); padding-block: 3rem; }
.eyebrow { margin-bottom: 1rem; color: var(--accent); font-size: .72rem; font-weight: 750; letter-spacing: .16em; }
h1 { max-width: none; margin-bottom: 1.4rem; font-size: clamp(1rem, 2.25vw, 2rem); letter-spacing: -.055em; white-space: nowrap; }
h1 em { color: var(--accent); font-style: normal; }
.hero-copy > p:not(.eyebrow) { max-width: 58ch; color: var(--muted); }
.network-visual { display: grid; min-height: 320px; place-items: center; color: var(--accent); border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(145deg, rgba(18, 45, 72, .56), rgba(7, 17, 31, .45)); box-shadow: inset 0 1px rgba(255, 255, 255, .04), 0 20px 60px rgba(0, 0, 0, .24); }
.network-visual svg { width: 92%; overflow: visible; }
.network-visual path { stroke-dasharray: 12 8; animation: dash 12s linear infinite; }
.network-visual circle { fill: var(--bg); stroke: var(--accent); stroke-width: 3; animation: pulse 3s ease-in-out infinite; transform-origin: center; }
.network-visual circle:nth-of-type(2n) { animation-delay: -1.3s; }
.site-footer { padding-block: 1.5rem 2rem; color: var(--muted); border-top: 1px solid var(--line); font-size: .86rem; text-align: center; }
.site-footer a { color: var(--accent); }

@keyframes dash { to { stroke-dashoffset: -180; } }
@keyframes pulse { 50% { filter: drop-shadow(0 0 8px var(--accent)); transform: scale(1.16); } }

@media (max-width: 760px) {
  .site-header, .hero, .site-footer { width: min(calc(100% - 2rem), var(--max-width)); }
  .site-header { min-height: 68px; }
  .hero { grid-template-columns: 1fr; padding-block: 2rem; }
  .network-visual { min-height: 250px; }
  .site-footer { padding-block: 1.25rem 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}