:root {
  color-scheme: light dark;
  --radius: 12px;
  --container: 1040px;
  --shadow: 0 6px 20px rgba(0,0,0,.06);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans CJK SC', 'PingFang SC', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: Canvas;
  color: CanvasText;
}

.container { max-width: var(--container); margin: 0 auto; padding: 24px; }

.site-header { position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(1.2) blur(8px); background: color-mix(in oklab, Canvas 92%, CanvasText 0%); border-bottom: 1px solid color-mix(in oklab, CanvasText 12%, Canvas); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.site-title { margin: 0; font-size: 28px; letter-spacing: .2px; }
.site-subtitle { margin: 6px 0 0; color: color-mix(in oklab, CanvasText 35%, Canvas); }

.lang-switch { display: inline-flex; align-items: center; gap: 8px; }
.lang-select { appearance: none; padding: 10px 14px; border-radius: var(--radius); border: 1px solid color-mix(in oklab, CanvasText 16%, Canvas); background: color-mix(in oklab, Canvas 96%, CanvasText 0%); color: CanvasText; box-shadow: var(--shadow); }
.lang-select:focus { outline: 2px solid color-mix(in oklab, LinkText 40%, Canvas); outline-offset: 2px; }

.hero { display: grid; grid-template-columns: 1.4fr .9fr; gap: 24px; align-items: center; margin-top: 8px; }
.hero-illus { aspect-ratio: 16/10; border-radius: calc(var(--radius) + 4px); background: radial-gradient(120% 120% at 10% 10%, color-mix(in oklab, LinkText 18%, Canvas) 0%, transparent 60%),
              radial-gradient(120% 120% at 90% 30%, color-mix(in oklab, CanvasText 14%, Canvas) 0%, transparent 60%), color-mix(in oklab, Canvas 96%, CanvasText 0%); border: 1px solid color-mix(in oklab, CanvasText 10%, Canvas); box-shadow: var(--shadow); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.card { border: 1px solid color-mix(in oklab, CanvasText 16%, Canvas); border-radius: var(--radius); padding: 18px; background: color-mix(in oklab, Canvas 96%, CanvasText 0%); box-shadow: var(--shadow); }
.card h2, .card h3 { margin-top: 0; }

.site-footer { border-top: 1px solid color-mix(in oklab, CanvasText 12%, Canvas); padding: 12px 0; color: color-mix(in oklab, CanvasText 45%, Canvas); }

a { color: LinkText; }
a:visited { color: color-mix(in oklab, LinkText 70%, CanvasText); }

@media (prefers-color-scheme: dark) {
  .card { background: color-mix(in oklab, Canvas 90%, CanvasText 0%); }
}

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; }
}