/* MechanicalAI shared style — dark theme per the site owner's HTML preferences.
   Layout: centred column; card grid that drops to one column on phones. */
:root {
  --bg: #080e18;
  --panel: #131f2e;
  --panel-hover: #182a3e;
  --deep: #07111e;
  --fg: #e2e8f0;
  --muted: #94a3b8;
  --line: #2d3f55;
  --blue: #3b82f6;
  --blue-soft: #93c5fd;
  --orange: #fb923c;
  --callout-bg: #0f2040;
  --callout-line: rgba(59, 130, 246, 0.3);
  --font: system-ui, -apple-system, "Segoe UI", "Microsoft JhengHei", "PingFang TC", "Noto Sans TC", sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "SFMono-Regular", monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg); font-family: var(--font);
  font-size: 16px; line-height: 1.7;
}
.wrap {
  max-width: 1040px; margin: 0 auto;
  padding-block: 32px 48px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  display: grid; gap: 28px;
}
.crumbs { font-size: 0.85rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs a { color: var(--blue-soft); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.hero { display: grid; gap: 6px; }
.eyebrow { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--orange); }
h1 { margin: 0; font-size: clamp(1.7rem, 4vw, 2.4rem); line-height: 1.25; text-wrap: balance; }
.lead { margin: 0; color: var(--muted); max-width: 62ch; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.card {
  display: grid; grid-template-rows: auto 1fr; min-width: 0;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  color: inherit; text-decoration: none; transition: border-color 0.15s, background 0.15s, transform 0.15s;
}
a.card:hover { border-color: var(--blue); background: var(--panel-hover); transform: translateY(-2px); }
a.card:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }
.card .media { aspect-ratio: 16 / 10; max-width: 100%; background: var(--deep); display: grid; place-items: center; border-bottom: 1px solid var(--line); }
.card .media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card .media svg { width: 42%; height: auto; }
.card .body { padding: 16px 18px 18px; display: grid; gap: 8px; align-content: start; }
.card h2 { margin: 0; font-size: 1.2rem; }
.card h2 .en { font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-left: 6px; }
.card ul { margin: 0; padding-left: 1.15em; color: var(--fg); font-size: 0.92rem; }
.card li::marker { color: var(--blue); }
.meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.tag { font-size: 0.75rem; color: var(--blue-soft); background: var(--callout-bg); border: 1px solid var(--callout-line); border-radius: 999px; padding: 1px 10px; }
.go { font-size: 0.88rem; color: var(--blue-soft); font-weight: 600; }
.card.soon { opacity: 0.6; }
.card.soon .go { color: var(--muted); font-weight: 400; }
/* category pages */
.cat-hero { display: grid; grid-template-columns: 96px 1fr; gap: 20px; align-items: center; }
.cat-icon { background: var(--deep); border: 1px solid var(--line); border-radius: 16px; padding: 10px; aspect-ratio: 1; }
.cat-icon svg { width: 100%; height: 100%; display: block; }
@media (max-width: 520px) { .cat-hero { grid-template-columns: 64px 1fr; gap: 14px; } }
.sec { margin: 0 0 12px; font-size: 1.15rem; }
.kinds { margin: 0; padding: 14px 18px 14px 2.3em; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; display: grid; gap: 8px; font-size: 0.95rem; }
.kinds li::marker { color: var(--orange); }
.kinds .en { color: var(--muted); font-size: 0.85em; }
.callout { margin: 0; background: var(--callout-bg); border: 1px solid var(--callout-line); color: var(--blue-soft); border-radius: 12px; padding: 12px 16px; font-size: 0.95rem; }
.callout strong { color: var(--fg); }
footer { color: var(--muted); font-size: 0.8rem; border-top: 1px solid var(--line); padding-top: 16px; }
@media (prefers-reduced-motion: reduce) { .card { transition: none; } a.card:hover { transform: none; } }