:root {
  --bg: #0b0e14; --surface: #151a23; --surface-2: #1d2430; --border: #2a3342;
  --text: #eef1f5; --muted: #9aa4b2; --accent: #6366f1; --accent-2: #22d3ee; --radius: 14px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { color-scheme: dark; }
body {
  margin: 0; font-family: Inter, system-ui, "Segoe UI", sans-serif; background: var(--bg); color: var(--text);
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
header { padding: 14px 20px; }
h1 {
  margin: 0; font-size: 1.15rem; font-weight: 700; letter-spacing: -.01em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent;
}
main { display: flex; flex-wrap: wrap; gap: 16px; padding: 0 16px 16px; max-width: 1200px; margin: 0 auto; }
.stage { position: relative; flex: 1 1 480px; background: #000; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); align-self: flex-start; }
canvas { width: 100%; height: auto; display: block; }
#status { position: absolute; left: 10px; right: 10px; bottom: 10px; padding: 8px 12px; background: rgba(11,14,20,.75); backdrop-filter: blur(8px); border-radius: 10px; font-size: .9rem; }
#status.error { background: rgba(139,30,30,.9); }
#fps { position: absolute; top: 10px; right: 10px; background: rgba(11,14,20,.75); backdrop-filter: blur(8px); padding: 3px 8px; border-radius: 999px; font-size: .75rem; }
.panel { flex: 0 0 320px; display: flex; flex-direction: column; gap: 14px; }
.row { display: flex; gap: 8px; }
.actions button { flex: 1; }
button {
  min-height: 44px; padding: 10px 16px; border: 0; border-radius: 12px; font: inherit; font-weight: 600;
  background: linear-gradient(135deg, var(--accent), #8b5cf6); color: #fff; cursor: pointer; touch-action: manipulation;
  transition: transform .1s, filter .15s;
}
button:active:not(:disabled) { transform: scale(.97); }
button:hover:not(:disabled) { filter: brightness(1.1); }
button.secondary { background: var(--surface-2); border: 1px solid var(--border); }
button:disabled { opacity: .4; cursor: not-allowed; }
button:focus-visible, select:focus-visible, input:focus-visible, label:has(input:focus-visible) { outline: 3px solid var(--accent-2); outline-offset: 2px; }
fieldset { border: 1px solid var(--border); background: var(--surface); border-radius: var(--radius); display: flex; flex-direction: column; gap: 12px; margin: 0; padding: 14px; }
legend { padding: 0 6px; color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; }
label { display: flex; flex-direction: column; gap: 6px; font-size: .9rem; }
label.check { flex-direction: row; align-items: center; gap: 10px; min-height: 36px; }
select { min-height: 44px; padding: 8px 10px; font: inherit; background: var(--surface-2); color: inherit; border: 1px solid var(--border); border-radius: 10px; }
input[type=checkbox] { width: 20px; height: 20px; accent-color: var(--accent); }
input[type=range] { width: 100%; height: 32px; accent-color: var(--accent); }
#effects { display: flex; flex-wrap: wrap; gap: 8px; }
#effects label { position: relative; flex-direction: row; padding: 9px 14px; min-height: 40px; align-items: center; background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; cursor: pointer; }
#effects input { position: absolute; opacity: 0; pointer-events: none; }
#effects label:has(input:checked) { background: var(--accent); border-color: var(--accent); color: #fff; }
.hint { font-size: .8rem; color: var(--muted); margin: 0; }
.hint.warn { color: #fbbf24; }
.disclaimer { margin: 0 16px 12px; padding: 10px 14px; background: rgba(251,191,36,.1); border: 1px solid rgba(251,191,36,.4); border-radius: 12px; color: #fde68a; font-size: .85rem; max-width: 1168px; }
@media (min-width: 1232px) { .disclaimer { margin-inline: auto; } }
.disclaimer-footer { max-width: 1200px; margin: 0 auto; padding: 8px 16px 24px; color: var(--muted); font-size: .75rem; }
.disclaimer-footer p { margin: 0; }
dialog { background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 18px; max-width: 460px; width: 94vw; max-height: 94dvh; overflow: auto; }
dialog::backdrop { background: rgba(0,0,0,.75); backdrop-filter: blur(4px); }
dialog canvas { width: 100%; max-width: 420px; height: auto; border-radius: 50%; display: block; margin: 0 auto 12px; }
dialog input[type=text] { min-height: 48px; padding: 8px 12px; font-size: 1.3rem; background: var(--bg); color: inherit; border: 1px solid var(--border); border-radius: 10px; }
dialog .row { flex-wrap: wrap; margin-top: 10px; }
dialog .row button { flex: 1 1 auto; }
#testResultText { white-space: pre-line; }

@media (max-width: 720px) {
  header { padding: 10px 16px; }
  main { padding: 0 10px 12px; gap: 12px; }
  .stage { flex: 1 1 100%; position: sticky; top: 0; z-index: 2; }
  .panel { flex: 1 1 100%; }
  .panel > .hint { display: none; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }