css/style.css

:root {
  --paper: #FCFCF7;
  --ink: #0B0A08;
  --red: #F4291F;
  --mute: #6B6862;
  --hair: 1.5px solid var(--ink);
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --head: "Inter Tight", "Inter", system-ui, sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--paper); color: var(--ink); }
body { font: 16px/1.5 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--red); }

.page { max-width: 1080px; margin: 0 auto; padding: 28px 24px 40px; }
.rule { border: 0; border-top: var(--hair); margin: 22px 0; }

.label { font: 500 11.5px/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; display: inline-flex; align-items: center; gap: 8px; }
.label.dim { color: var(--mute); }
.label b { font-weight: 600; color: var(--red); letter-spacing: .06em; }
.sq { display: inline-block; width: 8px; height: 8px; background: var(--ink); flex: none; }
.sq.red { background: var(--red); }

.mast { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; }
.mast-left { display: flex; align-items: flex-end; gap: 22px; }
.lockup { height: 96px; width: auto; display: block; }
.mast-meta { display: flex; flex-direction: column; gap: 6px; padding-bottom: 6px; }
.imprint { display: flex; align-items: center; gap: 10px; text-decoration: none; padding-bottom: 6px; }

.intro h1 { font: 800 clamp(34px, 5.4vw, 58px)/1.02 var(--head); letter-spacing: -.02em; margin: 6px 0 12px; }
.intro p { max-width: 62ch; margin: 0; color: #2a2824; }

.notice { border: var(--hair); padding: 16px 18px; margin: 22px 0 0; background: #fff; }
.notice p { margin: 8px 0; }
.notice.ok { border-color: var(--ink); }

.grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; margin-top: 26px; }
@media (max-width: 820px) { .grid { grid-template-columns: 1fr; } .lockup { height: 72px; } }

.panel { border-top: var(--hair); padding-top: 14px; }
textarea, input[type=number] {
  width: 100%; font: 16px/1.45 var(--sans); color: var(--ink); background: #fff;
  border: var(--hair); border-radius: 0; padding: 10px 12px; margin-top: 8px; resize: vertical;
}
textarea:focus, input:focus { outline: 2px solid var(--red); outline-offset: 1px; }

.examples { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 10px 0 18px; }
.chip { font: 13px/1.2 var(--sans); background: transparent; border: 1px solid var(--ink); padding: 5px 9px; cursor: pointer; color: var(--ink); text-align: left; }
.chip:hover { background: var(--ink); color: var(--paper); }

.row { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 16px; margin-bottom: 20px; }
@media (max-width: 480px) { .row { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; }
.seed-row { display: flex; gap: 6px; align-items: stretch; }
.seed-row input { margin-top: 8px; }
input[type=range] { width: 100%; margin-top: 16px; accent-color: var(--red); }

.btn { font: 600 13px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; border: var(--hair); background: var(--paper); color: var(--ink); padding: 14px 18px; cursor: pointer; border-radius: 0; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.btn.primary { width: 100%; background: var(--ink); color: var(--paper); }
.btn.primary:hover:not(:disabled) { background: var(--red); border-color: var(--red); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.icon { margin-top: 8px; padding: 0 12px; font-size: 18px; letter-spacing: 0; }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }
.btn.small { padding: 9px 12px; font-size: 11px; }

.progress { margin-top: 16px; }
.bar { height: 8px; border: var(--hair); background: #fff; }
#bar-fill { height: 100%; width: 0; background: var(--red); transition: width .12s linear; }
.progress-text { display: flex; justify-content: space-between; margin-top: 8px; gap: 12px; }

.out-head, .out-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.out-foot { align-items: flex-start; margin-top: 12px; }
.toggle { cursor: pointer; }
.toggle input { accent-color: var(--red); margin: 0; }
.frame { position: relative; margin-top: 10px; border: var(--hair); background: #fff; aspect-ratio: 1 / 1; width: 100%; }
#canvas { width: 100%; height: 100%; display: block; image-rendering: auto; }
.frame.crisp #canvas { image-rendering: pixelated; }
.placeholder { position: absolute; inset: 0; display: grid; place-items: center; background: var(--paper); }
.placeholder img { width: 28%; opacity: .14; }
.frame.busy .placeholder img { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .32; } }

.timings { display: grid; grid-template-columns: auto auto; gap: 2px 14px; margin: 0; font: 12px/1.5 var(--mono); }
.timings dt { color: var(--mute); text-transform: uppercase; letter-spacing: .1em; font-size: 11px; }
.timings dd { margin: 0; }

.foot p { margin: 0 0 8px; }
.foot .strong { font: 700 18px/1.3 var(--head); }
.foot .label { display: flex; flex-wrap: wrap; gap: 4px 8px; }
@media (max-width: 520px) {
  .page { padding: 20px 16px 32px; }
  .mast-meta .label.dim { display: none; }
  .progress-text { flex-wrap: wrap; }
}