/* Gen-Zero demo shell: shared tokens, nav, HUD and control primitives for public/demos/*.html.
   Token values match public/cases/tetris.html so the demos read as one product. */
@font-face { font-family: 'Archivo X'; src: url('/fonts/Archivo-w1250-900.ttf') format('truetype'); font-weight: 900; font-display: block; }
@font-face { font-family: 'Archivo'; src: url('/fonts/Archivo-w1000-300.ttf') format('truetype'); font-weight: 300; font-display: swap; }
@font-face { font-family: 'Archivo'; src: url('/fonts/Archivo-w1000-700.ttf') format('truetype'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'Plex Mono'; src: url('/fonts/IBMPlexMono-Regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Plex Mono'; src: url('/fonts/IBMPlexMono-Medium.ttf') format('truetype'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'Plex Mono'; src: url('/fonts/IBMPlexMono-Bold.ttf') format('truetype'); font-weight: 700; font-display: swap; }

:root {
  color-scheme: dark;
  --ink: #08090B; --ink2: #12151A; --ink3: #0b0d11; --graphite: #4F555C; --ash: #8E949A; --bone: #ECE7DC;
  --amber: #FFA51F; --ember: #FFD27A; --cyan: #2FE3F0; --crimson: #E2261B; --emerald: #35E58A;
  --cjk: 'Noto Sans CJK SC', 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei';
  --sans: 'Archivo', var(--cjk), system-ui, sans-serif;
  --mono: 'Plex Mono', var(--cjk), ui-monospace, monospace;
  --display: 'Archivo X', 'Archivo', var(--cjk), sans-serif;
  --pad: clamp(16px, 4vw, 56px);
}
html[lang='ja'] { --cjk: 'Noto Sans CJK JP', 'Noto Sans JP', 'Source Han Sans JP', 'Hiragino Sans', 'Yu Gothic', 'Meiryo'; }
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--ink); color: var(--bone); }
body { font: 300 16px/1.7 var(--sans); -webkit-font-smoothing: antialiased; }
html:is([lang='zh-CN'], [lang='ja']) body { line-height: 1.8; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, canvas:focus-visible, input:focus-visible { outline: 1px solid var(--cyan); outline-offset: 3px; }

.top { position: sticky; top: 0; z-index: 20; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 22px; padding: 14px var(--pad);
  font: 500 12px/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; background: rgba(8, 9, 11, 0.95); border-bottom: 1px solid rgba(79, 85, 92, 0.6); backdrop-filter: blur(8px); }
.top .brand { color: var(--bone); text-decoration: none; font: 900 18px/1 var(--display); letter-spacing: 0.02em; }
.top .nav-link { color: var(--ash); text-decoration: none; }
.top .nav-link:hover { color: var(--bone); }
.top .nav-link.active { color: var(--cyan); }
.top-right { margin-left: auto; display: flex; align-items: center; gap: 16px; }
.lang { display: flex; align-items: center; gap: 6px; color: var(--ash); }
.lang button { background: none; border: 0; padding: 4px 2px; cursor: pointer; color: var(--ash); letter-spacing: 0.12em; font: 500 12px/1 var(--mono); }
.lang button[aria-pressed='true'] { color: var(--cyan); text-shadow: 0 0 10px rgba(47, 227, 240, 0.55); }

main { padding: 5vh var(--pad) 8vh; max-width: calc(1280px + 2 * var(--pad)); margin: 0 auto; }
.kicker { font: 500 13px/1.4 var(--mono); letter-spacing: 0.2em; color: var(--amber); text-transform: uppercase; margin: 0 0 14px; }
.kicker::before { content: '+ '; color: var(--ash); }
h1 { margin: 0 0 16px; font: 900 clamp(26px, 4vw, 52px)/1.1 var(--display); letter-spacing: -0.01em; color: var(--bone); }
.lead { font: 400 15px/1.7 var(--mono); color: var(--cyan); letter-spacing: 0.01em; max-width: 900px; margin: 0 0 28px; }
.section-title { font: 900 clamp(19px, 2.4vw, 28px)/1.2 var(--display); color: var(--bone); margin: 46px 0 16px; padding-bottom: 8px; border-bottom: 1px solid rgba(79, 85, 92, 0.4); }
.note { font: 400 13px/1.7 var(--mono); color: var(--ash); }
.note b { color: var(--bone); font-weight: 500; }

/* ---- stage layout: canvas + side panel ---- */
.stage-wrap { display: flex; flex-wrap: wrap; gap: 22px; align-items: flex-start; background: var(--ink3);
  border: 1px solid rgba(47, 227, 240, 0.35); border-radius: 6px; padding: 20px; box-shadow: 0 0 40px rgba(47, 227, 240, 0.06) inset; }
.stage-canvas-col { position: relative; flex: 0 0 auto; }
canvas.stage { display: block; max-width: 100%; height: auto; background: #05060a; border: 1px solid rgba(47, 227, 240, 0.5); border-radius: 4px; touch-action: none; }
.side-panel { flex: 1 1 280px; min-width: 260px; display: flex; flex-direction: column; gap: 14px; }

/* ---- HUD / telemetry ---- */
.hud-grid { display: grid; grid-template-columns: auto 1fr; gap: 7px 16px; font: 400 12.5px/1.4 var(--mono); }
.hud-grid dt { color: var(--ash); }
.hud-grid dd { margin: 0; color: var(--cyan); font-weight: 500; }
.hud-grid dd.warn { color: var(--amber); }
.hud-grid dd.bad { color: var(--crimson); }
.hud-grid dd.good { color: var(--emerald); }

.engine-badge { display: inline-flex; align-items: center; gap: 7px; font: 500 11px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  padding: 6px 10px; border: 1px solid var(--graphite); border-radius: 3px; color: var(--ash); }
.engine-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ash); }
.engine-badge[data-engine='wasm'] { border-color: var(--emerald); color: var(--emerald); }
.engine-badge[data-engine='wasm'] .dot { background: var(--emerald); box-shadow: 0 0 8px var(--emerald); }
.engine-badge[data-engine='js'] { border-color: var(--amber); color: var(--amber); }
.engine-badge[data-engine='js'] .dot { background: var(--amber); }
.engine-badge[data-engine='loading'] .dot { background: var(--cyan); animation: pulse-dot 1s ease-in-out infinite; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }

/* ---- controls ---- */
.ctrl-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font: 500 11.5px/1 var(--mono); color: var(--ash); letter-spacing: 0.06em; text-transform: uppercase; }
.btn { padding: 9px 15px; font: 500 12px/1 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; border: 1px solid var(--cyan); color: var(--cyan); background: transparent; cursor: pointer; border-radius: 3px; transition: background 0.12s, color 0.12s; }
.btn:hover { background: var(--cyan); color: var(--ink); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.amber { border-color: var(--amber); color: var(--amber); }
.btn.amber:hover { background: var(--amber); color: var(--ink); }
.chip { padding: 5px 11px; font: 500 11.5px/1 var(--mono); border: 1px solid var(--graphite); color: var(--ash); background: transparent; cursor: pointer; border-radius: 3px; }
.chip[aria-pressed='true'] { border-color: var(--amber); color: var(--amber); }
label.field { display: flex; align-items: center; gap: 8px; font: 500 11.5px/1 var(--mono); color: var(--ash); letter-spacing: 0.05em; text-transform: uppercase; }
input[type='range'] { accent-color: var(--cyan); width: 130px; }

/* ---- gate alert banner ---- */
.gate-alert { border: 1px solid rgba(226, 38, 27, 0.6); background: rgba(226, 38, 27, 0.08); color: var(--bone);
  padding: 12px 16px; border-radius: 4px; font: 500 13px/1.5 var(--mono); display: none; align-items: center; gap: 10px; }
.gate-alert.show { display: flex; animation: gate-flash 0.5s ease-in-out 2; }
.gate-alert b { color: var(--crimson); }
@keyframes gate-flash { 0%, 100% { border-color: rgba(226, 38, 27, 0.6); box-shadow: none; } 50% { border-color: var(--crimson); box-shadow: 0 0 24px rgba(226, 38, 27, 0.5); } }

/* ---- dpad (touch) ---- */
.dpad { display: grid; grid-template-columns: repeat(3, 44px); grid-template-rows: repeat(3, 44px); gap: 6px; }
.dpad button { border: 1px solid var(--graphite); background: var(--ink2); color: var(--cyan); border-radius: 4px; font: 700 16px/1 var(--mono); cursor: pointer; }
.dpad button:active { background: var(--cyan); color: var(--ink); }
.dpad .up { grid-column: 2; grid-row: 1; } .dpad .left { grid-column: 1; grid-row: 2; }
.dpad .down { grid-column: 2; grid-row: 3; } .dpad .right { grid-column: 3; grid-row: 2; }
@media (hover: hover) and (pointer: fine) { .dpad { display: none; } }

.loading-veil { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(5, 6, 10, 0.85);
  font: 500 12px/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--cyan); border-radius: 4px; }
.loading-veil::before { content: ''; width: 16px; height: 16px; margin-right: 10px; border: 2px solid rgba(47, 227, 240, 0.3); border-top-color: var(--cyan); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-veil[hidden] { display: none; }

footer { padding: 34px var(--pad); border-top: 1px solid rgba(79, 85, 92, 0.5); font: 400 12.5px/1.6 var(--mono); color: var(--ash);
  max-width: calc(1280px + 2 * var(--pad)); margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }

@media (max-width: 720px) {
  .stage-wrap { flex-direction: column; }
  canvas.stage { width: 100%; }
}