css/style.css

/* Neutral and borderless, after the Pi Web / Trace tokens: surfaces one step off the canvas, a grey accent, and
   hue only for what the model sees (context in violet, targets and generated motion in teal, as in the 3D scene). */
:root {
  --canvas: #0a0a0a;
  --glass: rgba(18, 18, 18, 0.8);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --selected: rgba(255, 255, 255, 0.14);
  --elevated: #212121;
  --subtle: rgba(255, 255, 255, 0.05);
  --line: #2e2e2e;
  --ink: #ededed;
  --ink-body: #d4d4d4;
  --ink-muted: #a3a3a3;
  --ink-faint: #8a8a8a;
  --accent: #e5e5e5;
  --on-accent: #0a0a0a;
  --bad: #ff6467;
  --scrim: rgba(0, 0, 0, 0.6);
  --shadow-pop: 0 12px 36px rgba(0, 0, 0, 0.6), 0 2px 8px rgba(0, 0, 0, 0.4);
  --ctx: #a78bfa;
  --tgt: #5eead4;
  --sans: Geist, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --gutter: 12px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: var(--canvas); color: var(--ink-body); font: 13px/20px var(--sans); -webkit-font-smoothing: antialiased; }
#stage, #stage canvas { position: fixed; inset: 0; display: block; touch-action: none; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.glass { background: var(--glass); border-radius: 10px; backdrop-filter: blur(16px) saturate(1.1); -webkit-backdrop-filter: blur(16px) saturate(1.1); }
kbd { font: 500 11px/16px var(--mono); padding: 0 4px; border-radius: 4px; background: var(--subtle); color: var(--ink-muted); }
.icon { display: block; flex: none; }
[data-icon] { display: inline-flex; }
.icon-btn { width: 28px; height: 28px; display: inline-grid; place-items: center; border: 0; border-radius: 6px; background: var(--glass); color: var(--ink-muted); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); transition: background 0.12s, color 0.12s; }
.icon-btn:hover { background: var(--elevated); color: var(--ink); }
.btn { height: 32px; padding: 0 12px; border: 0; border-radius: 6px; background: var(--subtle); color: var(--ink); font-weight: 500; transition: background 0.12s; }
.btn:hover { background: var(--surface-hover); }

/* ------------------------------------------------------------------------------------------- header */
#title { position: fixed; top: var(--gutter); left: var(--gutter); display: flex; align-items: center; gap: 10px; }
#title .brand { display: flex; align-items: center; gap: 8px; font-size: 15px; line-height: 22px; font-weight: 600; color: var(--ink); letter-spacing: -0.01em; }
#title .brand small { font-size: 15px; font-weight: 400; color: var(--ink-muted); }
#title .mark { fill: var(--ink); }
#title .sub { font-size: 12px; line-height: 16px; color: var(--ink-faint); }
#about-open { width: 24px; height: 24px; margin-left: -2px; background: none; color: var(--ink-faint); backdrop-filter: none; -webkit-backdrop-filter: none; }
#about-open:hover { background: var(--subtle); color: var(--ink); }
#title .brand, #title .sub { text-shadow: 0 1px 8px rgba(0, 0, 0, 0.6); }

/* ------------------------------------------------------------------------------------------- stats */
#stats { position: fixed; top: var(--gutter); right: var(--gutter); display: flex; gap: 20px; padding: 7px 14px; }
#stats > div { display: flex; flex-direction: column; }
#stats label { font-size: 11px; line-height: 16px; color: var(--ink-faint); }
#stats > div > span { display: flex; align-items: center; gap: 6px; font: 500 13px/20px var(--mono); font-variant-numeric: tabular-nums; color: var(--ink); white-space: nowrap; }
#stats .wide { min-width: 168px; }
#stats #state { font-family: var(--sans); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--line); transition: background 0.1s, box-shadow 0.1s; }
.dot.on { background: var(--ink); box-shadow: 0 0 8px rgba(255, 255, 255, 0.7); }

/* ------------------------------------------------------------------------------------------- panel */
#panel { position: fixed; left: var(--gutter); top: 64px; width: 252px; max-height: calc(100% - 64px - 96px); overflow: auto; overscroll-behavior: contain; scrollbar-width: none; padding: 4px 12px 10px; transition: transform 0.22s cubic-bezier(0.2, 0, 0, 1), opacity 0.22s; }
#panel::-webkit-scrollbar { display: none; }
body.panel-collapsed #panel { transform: translateX(calc(-100% - 2 * var(--gutter))); opacity: 0; pointer-events: none; }
#panel h3 { margin: 14px 0 6px; font-size: 11px; line-height: 16px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-faint); }
#panel > h3:first-child { margin-top: 10px; }

.segmented { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; padding: 2px; border-radius: 8px; background: var(--subtle); }
.segmented button { height: 26px; border: 0; border-radius: 6px; background: none; color: var(--ink-muted); font-weight: 500; transition: background 0.12s, color 0.12s; }
.segmented button:hover { color: var(--ink); }
.segmented button.on { background: var(--selected); color: var(--ink); }

.styles { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.styles button { height: 30px; display: flex; align-items: center; justify-content: space-between; gap: 6px; padding: 0 8px 0 10px; border: 0; border-radius: 6px; background: var(--subtle); color: var(--ink-body); white-space: nowrap; transition: background 0.12s, color 0.12s; }
.styles button:hover { background: var(--surface-hover); }
.styles button kbd { background: none; padding: 0; color: var(--ink-faint); }
.styles button.on { background: var(--selected); color: var(--ink); font-weight: 500; }
.styles button.on kbd { color: var(--ink-muted); }

.switches label { display: flex; align-items: center; justify-content: space-between; height: 28px; color: var(--ink-body); cursor: pointer; }
.switches input { appearance: none; -webkit-appearance: none; position: relative; flex: none; width: 26px; height: 16px; margin: 0; border-radius: 999px; background: var(--line); cursor: pointer; transition: background 0.15s; }
.switches input::before { content: ''; position: absolute; left: 2px; top: 2px; width: 12px; height: 12px; border-radius: 50%; background: var(--ink-muted); transition: transform 0.15s, background 0.15s; }
.switches input:checked { background: var(--accent); }
.switches input:checked::before { transform: translateX(10px); background: var(--on-accent); }

#help summary { display: flex; align-items: center; justify-content: space-between; list-style: none; cursor: pointer; color: var(--ink-faint); }
#help summary::-webkit-details-marker { display: none; }
#help summary [data-icon] { transition: transform 0.15s; }
#help:not([open]) summary [data-icon] { transform: rotate(-90deg); }

/* Trace lines: an icon, what happened, and the details beside it in a quieter voice. */
.trace .line { display: grid; grid-template-columns: 16px auto minmax(0, 1fr); align-items: center; column-gap: 8px; min-height: 24px; }
.trace .line > [data-icon], .trace .line > .icon { color: var(--ink-faint); }
.trace .t { color: var(--ink-body); white-space: nowrap; }
.trace .d { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; color: var(--ink-faint); }
#help .line { grid-template-columns: 16px minmax(0, 1fr); grid-template-areas: 'i t' '. d'; align-items: start; padding: 3px 0; }
#help .line > [data-icon] { grid-area: i; margin-top: 2px; }
#help .t { grid-area: t; }
#help .d { grid-area: d; white-space: normal; line-height: 18px; }
#help kbd { font-size: 10.5px; }

/* ------------------------------------------------------------------------------------------- generation log */
#log { position: fixed; right: var(--gutter); top: 72px; width: 300px; padding: 0 4px; pointer-events: none; text-shadow: 0 1px 6px rgba(0, 0, 0, 0.7); }
#log .line { transition: opacity 0.3s; }
#log .t { font-weight: 500; color: var(--ink-muted); }
#log .line:first-child .t { color: var(--ink); }
#log .line:first-child > .icon { color: var(--ink-muted); }
#log .d { font: 11px/16px var(--mono); font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------------------------------- timeline */
#timeline-wrap { position: fixed; left: 50%; bottom: var(--gutter); transform: translateX(-50%); width: min(500px, calc(100% - 2 * var(--gutter))); padding: 9px 14px 13px; }
.tl-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
#tl-label { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font: 11px/16px var(--mono); color: var(--ink-muted); }
.legend { display: flex; gap: 12px; font-size: 11px; line-height: 16px; color: var(--ink-faint); white-space: nowrap; }
.legend span::before { content: ''; display: inline-block; width: 6px; height: 6px; border-radius: 50%; margin-right: 5px; vertical-align: 1px; }
.legend .l-ctx::before { background: var(--ctx); }
.legend .l-tgt::before { background: var(--tgt); }
.legend .l-plan::before { width: 10px; height: 2px; border-radius: 1px; background: var(--tgt); vertical-align: 3px; }
.legend .l-tr::before { width: 4px; height: 4px; border: 1.5px solid var(--tgt); background: none; }
#timeline { position: relative; height: 4px; margin: 9px 0 0 8px; border-radius: 2px; background: var(--line); }
#timeline .ctx { position: absolute; left: -8px; top: 0; width: 5px; height: 4px; border-radius: 2px; background: var(--ctx); }
#timeline .done { position: absolute; left: 0; top: 0; height: 4px; width: var(--play, 0%); border-radius: 2px; background: var(--tgt); opacity: 0.6; }
#timeline .play { position: absolute; top: -4px; left: var(--play, 0%); width: 2px; height: 12px; border-radius: 1px; background: var(--ink); transform: translateX(-1px); }
#timeline .trans { position: absolute; top: -3px; left: var(--trans, 100%); width: 10px; height: 10px; border-radius: 50%; border: 2px solid var(--tgt); background: var(--canvas); transform: translateX(-5px); }
#timeline.idle i { display: none; }

/* ------------------------------------------------------------------------------------------- dialogs */
.dialog { background: var(--elevated); color: var(--ink-body); border: 0; border-radius: 12px; box-shadow: var(--shadow-pop); }
.dialog p { margin: 0 0 12px; font-size: 14px; line-height: 22px; }
.small, .dialog p.small { font-size: 12px; line-height: 18px; color: var(--ink-faint); }
.err { color: var(--bad); }

#loading { position: fixed; left: 50%; top: 50%; transform: translate(-50%, -50%); width: min(480px, calc(100% - 32px)); padding: 24px; z-index: 10; transition: opacity 0.4s, transform 0.4s; }
#loading h1 { margin: 0 0 8px; font-size: 22px; line-height: 28px; font-weight: 500; letter-spacing: -0.01em; color: var(--ink); }
#loading h1 span { color: var(--ink-muted); }
#loading > p:first-of-type { margin-bottom: 18px; }
.loadrow { display: grid; grid-template-columns: 112px 1fr 136px; align-items: center; gap: 12px; margin: 10px 0; }
.loadrow b { height: 4px; border-radius: 2px; overflow: hidden; background: var(--line); }
.loadrow i { display: block; height: 100%; width: 0; background: var(--ink); transition: width 0.2s; }
.loadrow em { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-align: right; font: 11px/16px var(--mono); font-style: normal; color: var(--ink-faint); }
.loadrow.err em { color: var(--bad); }
#loading .small { margin: 18px 0 16px; }
#load-error:empty { display: none; }
body:not(.world-ready) #start { visibility: hidden; }
body.model-ready #loading, body.dismissed #loading { opacity: 0; transform: translate(-50%, -47%); pointer-events: none; }

#about { width: min(460px, calc(100% - 32px)); padding: 20px 20px 8px; }
#about::backdrop { background: var(--scrim); }
#about h2 { margin: 0 0 10px; font-size: 15px; line-height: 22px; font-weight: 600; color: var(--ink); }
#about a { color: var(--accent); text-decoration: underline; text-decoration-color: rgba(229, 229, 229, 0.4); text-underline-offset: 2px; }
#about a:hover { color: #fff; text-decoration-color: currentColor; }
#about-close { position: absolute; top: 14px; right: 14px; background: none; }
#about-close:hover { background: var(--subtle); }

/* ------------------------------------------------------------------------------------------- touch */
#touch { display: none; }
@media (pointer: coarse) {
  #touch { display: block; }
  #joystick { position: fixed; left: 16px; bottom: 104px; width: 112px; height: 112px; border-radius: 50%; background: var(--glass); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); touch-action: none; }
  #knob { position: absolute; left: 34px; top: 34px; width: 44px; height: 44px; border-radius: 50%; background: rgba(255, 255, 255, 0.28); }
  .touch-buttons { position: fixed; right: 16px; bottom: 104px; display: flex; flex-direction: column; gap: 8px; }
  .touch-buttons button { width: 88px; height: 44px; border: 0; border-radius: 10px; background: var(--glass); color: var(--ink); font-weight: 500; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
  .touch-buttons button:active { background: var(--accent); color: var(--on-accent); }
}

/* ------------------------------------------------------------------------------------------- small screens */
@media (max-width: 760px) {
  :root { --gutter: 8px; }
  #title .sub, #stats, #log { display: none; }
  #panel { z-index: 15; top: auto; bottom: var(--gutter); left: var(--gutter); right: var(--gutter); width: auto; max-height: 62%; background: rgba(24, 24, 24, 0.94); box-shadow: var(--shadow-pop); }
  body.panel-collapsed #panel { transform: translateY(calc(100% + 2 * var(--gutter))); }
  .styles { grid-template-columns: 1fr 1fr 1fr; }
  .styles button kbd { display: none; }
  .switches { display: grid; grid-template-columns: 1fr 1fr; column-gap: 16px; }
  .tl-head { flex-wrap: wrap; row-gap: 2px; }
  .loadrow { grid-template-columns: 88px 1fr 104px; }
}
@media (pointer: coarse) { #help .kb { display: none; } }

/* ------------------------------------------------------------------------------------------- capture */
/* Capture mode: clean frame for video recording. */
body.capture #panel, body.capture #panel-toggle, body.capture #about-open, body.capture #touch, body.capture #loading { display: none !important; }
body.promo #touch, body.promo #loading { display: none !important; }

#caption, #card { display: none; }
body.capture #caption { display: block; position: fixed; z-index: 20; left: 50%; bottom: 112px; transform: translateX(-50%); text-align: center; opacity: 0; transition: opacity 0.4s; pointer-events: none; }
body.capture #caption.on { opacity: 1; }
#caption b { display: inline-block; font-size: 30px; line-height: 40px; font-weight: 600; letter-spacing: -0.02em; color: var(--ink); padding: 6px 18px; border-radius: 12px; background: rgba(10, 10, 10, 0.66); }
#caption span { display: block; margin-top: 8px; font-size: 18px; line-height: 26px; color: var(--ink-body); text-shadow: 0 2px 10px rgba(0, 0, 0, 0.9); }
body.capture #card { display: flex; position: fixed; inset: 0; z-index: 30; align-items: center; justify-content: center; flex-direction: column; text-align: center; background: radial-gradient(ellipse at center, rgba(10, 10, 10, 0.55), rgba(10, 10, 10, 0.92)); opacity: 0; transition: opacity 0.5s; pointer-events: none; }
body.capture #card.on { opacity: 1; }
#card h1 { font-size: 76px; line-height: 1.1; font-weight: 600; margin: 0; letter-spacing: -0.03em; color: var(--ink); }
#card p { font-size: 28px; line-height: 1.3; color: var(--ink-body); margin: 14px 0 18px; }
#card small { font-size: 16px; color: var(--ink-faint); line-height: 1.6; }