/* play.css — the catalog grid, the feature-page skeleton, and the ONE shared knob panel.
 * The knob panel is the affordability trick: 31 features, one editor chrome, rendered from the registry.
 */

/* ============================ CATALOG ============================ */
.hero { padding: 62px 0 30px; }
.hero h1 { max-width: 15ch; }
.hero .lede { max-width: 62ch; margin-top: 18px; }
.hero-stats { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 26px; }
.hero-stats div { font-size: 0.83rem; color: var(--ink-3); }
.hero-stats b { display: block; font-size: 1.5rem; color: var(--ink); font-weight: 660; letter-spacing: -0.02em; line-height: 1.2; }

.filters {
  position: sticky; top: 58px; z-index: 50; margin: 26px 0 8px; padding: 12px 0;
  background: linear-gradient(rgba(238,241,251,.86), rgba(238,241,251,.62) 70%, rgba(238,241,251,0));
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.filter-row { display: flex; gap: 7px; flex-wrap: wrap; align-items: center; }
.chip {
  font-family: var(--sans); font-size: 0.8rem; font-weight: 560; cursor: pointer;
  border: 1px solid var(--line); background: rgba(255,255,255,.72); color: var(--ink-2);
  padding: 6px 12px; border-radius: 999px; display: inline-flex; align-items: center; gap: 6px;
}
.chip:hover { border-color: rgba(22,24,31,.26); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.chip .n { font-family: var(--mono); font-size: 0.72em; opacity: .6; }
.chip[aria-pressed="true"] .n { opacity: .78; }
html:not(.js) .filters { display: none; }  /* filters are a JS affordance; without JS every card is shown */

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 12px; align-items: start; }

/* the pointer-lit grid IS feature 8.1, used on its own catalog. one listener on the container. */
.grid { --gx: 50%; --gy: -300px; }
.fcard {
  position: relative; display: flex; flex-direction: column; text-decoration: none; color: inherit;
  background: var(--card); border: 1px solid var(--line-2); border-radius: var(--radius);
  backdrop-filter: blur(10px) saturate(130%); -webkit-backdrop-filter: blur(10px) saturate(130%);
  box-shadow: var(--shadow); overflow: hidden; isolation: isolate;
  transition: transform .22s cubic-bezier(.2,.7,.3,1), box-shadow .22s;
}
.fcard::before {   /* the torch: a radial mask lighting the border near the pointer */
  content: ''; position: absolute; inset: -1px; border-radius: inherit; z-index: 2; pointer-events: none;
  padding: 1px; opacity: 0; transition: opacity .3s;
  background: radial-gradient(240px circle at var(--gx) var(--gy), rgba(63,79,216,.85), rgba(180,64,138,.5) 40%, transparent 68%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
}
.grid:hover .fcard::before { opacity: 1; }
.fcard:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
html:not(.anim) .fcard { transition: none; }
html:not(.anim) .fcard:hover { transform: none; }

.fcard-top { padding: 16px 17px 0; display: flex; align-items: center; gap: 8px; }
.fcard-num { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); }
.fcard-body { padding: 9px 17px 17px; flex: 1; display: flex; flex-direction: column; }
.fcard h3 { font-size: 1.03rem; letter-spacing: -0.022em; margin-bottom: 5px; }
/* the naming trick, made structural: .is is what it IS, .like is what it's LIKE */
.fcard .like { font-size: 0.88rem; color: var(--ink-2); line-height: 1.5; flex: 1; }
.fcard-foot { display: flex; gap: 6px; align-items: center; margin-top: 13px; flex-wrap: wrap; }
.fcard .knobcount { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-3); margin-left: auto; }

/* preview tile: LIVE on the few cards that declare it (gradientlab runs 4-6, never all 19);
 * STATIC (a real screenshot of the feature's own stage, taken by thumbs.cjs) on every other card,
 * so the catalog SHOWS each feature instead of describing it. Images work without JS — the static
 * tiles are part of the floor, not gated behind it. */
.fcard-prev { position: relative; height: 132px; min-height: 0; margin: 13px 0 0; border-top: 1px solid var(--line-2); background: #f4f5fa; overflow: hidden; }
.fcard-prev canvas, .fcard-prev .prev-dom { position: absolute; inset: 0; width: 100%; height: 100%; }
.fcard-prev.static img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 32%; }
.fcard-prev .prev-badge {
  position: absolute; right: 7px; bottom: 6px; z-index: 3; font-family: var(--mono); font-size: 0.6rem;
  letter-spacing: .06em; text-transform: uppercase; color: rgba(255,255,255,.9); background: rgba(22,24,31,.4);
  padding: 2px 6px; border-radius: 4px; backdrop-filter: blur(4px);
}
html:not(.js) .fcard-prev:not(.static) { display: none; }  /* live tiles need JS; static screenshots do not */

.cat-head { margin: 42px 0 4px; display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.cat-head h2 { letter-spacing: -0.028em; }
.cat-head .blurb { color: var(--ink-3); font-size: 0.9rem; }
.cat-sec[hidden] { display: none; }

/* ============================ FEATURE PAGE ============================ */
.feat-nav {
  position: sticky; top: 58px; z-index: 50; padding: 9px 0;
  background: linear-gradient(rgba(238,241,251,.88), rgba(238,241,251,.55) 72%, rgba(238,241,251,0));
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
}
.feat-nav .wrap { display: flex; gap: 3px; align-items: center; overflow-x: auto; scrollbar-width: none; }
.feat-nav .wrap::-webkit-scrollbar { display: none; }
.feat-nav a {
  font-size: 0.78rem; color: var(--ink-3); text-decoration: none; padding: 5px 11px; border-radius: 7px;
  white-space: nowrap; font-weight: 540;
}
.feat-nav a:hover { background: rgba(22,24,31,.06); color: var(--ink); }
.feat-nav a.on { background: rgba(63,79,216,.1); color: var(--accent); }

.feat-hero { padding: 44px 0 6px; }
.feat-hero h1 { max-width: 17ch; }
.feat-like { font-size: 1.2rem; color: var(--ink-2); max-width: 56ch; margin-top: 16px; font-style: italic; }
.feat-sub { font-size: 1rem; color: var(--ink-3); max-width: 62ch; margin-top: 12px; }

section.fs { padding: 46px 0 0; scroll-margin-top: 108px; }
section.fs > .wrap > h2 { margin-bottom: 14px; }
.prose { max-width: 68ch; }
.prose p { color: var(--ink-2); }

/* ---- THE ONE SHARED EDITOR: stage + knob rail ------------------------------------------------------ */
.editor {
  display: grid; grid-template-columns: 1fr 296px; gap: 0; margin-top: 8px;
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: var(--card-solid); box-shadow: var(--shadow-lg);
}
.stage {
  position: relative; min-height: clamp(440px, 60vh, 660px); background: #f4f5fa; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
/* the no-WebGL / no-JS poster. A real field, never a blank rectangle. */
.stage .poster {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(900px 760px at 22% 18%, rgba(122,178,235,.75), transparent 72%),
    radial-gradient(820px 700px at 78% 30%, rgba(126,124,220,.7), transparent 72%),
    radial-gradient(760px 660px at 38% 74%, rgba(178,120,206,.62), transparent 72%),
    radial-gradient(700px 620px at 84% 82%, rgba(226,140,110,.5), transparent 72%),
    linear-gradient(160deg, #cfe0f4, #d6d3f0 46%, #f0dbe4);
}
html.js .stage.has-live .poster { display: none; }
.stage-scroll { position: absolute; inset: 0; overflow-y: auto; overscroll-behavior: contain; z-index: 2; }
.stage-note {
  position: absolute; left: 12px; bottom: 11px; z-index: 8; font-family: var(--mono); font-size: 0.66rem;
  color: rgba(255,255,255,.92); background: rgba(22,24,31,.44); padding: 3px 8px; border-radius: 5px;
  backdrop-filter: blur(4px); pointer-events: none; max-width: calc(100% - 24px);
}
.stage-note.warn { background: rgba(156,68,21,.9); }

/* the expand control + the knob HUD: both live ON the stage so your eyes never leave the picture */
.stage-expand {
  position: absolute; right: 10px; top: 10px; z-index: 9; cursor: pointer;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: .05em; text-transform: uppercase;
  color: rgba(255,255,255,.92); background: rgba(22,24,31,.44); border: 1px solid rgba(255,255,255,.18);
  padding: 4px 9px; border-radius: 6px; backdrop-filter: blur(4px);
}
.stage-expand:hover { background: rgba(22,24,31,.66); }
html:not(.js) .stage-expand { display: none; }
.stage-hud {
  position: absolute; left: 12px; top: 11px; z-index: 8; pointer-events: none;
  font-family: var(--mono); font-size: 0.78rem; font-weight: 600; font-variant-numeric: tabular-nums;
  color: #fff; background: rgba(22,24,31,.55); padding: 5px 10px; border-radius: 7px;
  backdrop-filter: blur(4px); opacity: 0; transition: opacity .25s;
}
/* appears INSTANTLY (transition:none), fades only on the way out. A HUD that needs an animation
   frame to become visible never shows up on a struggling renderer — feedback must not be deferrable. */
.stage-hud.on { opacity: 1; transition: none; }
html:not(.anim) .stage-hud { transition: none; }

/* fullscreen: the WHOLE editor goes up (stage grows huge, the knob rail comes along and keeps working) */
.editor:fullscreen { border-radius: 0; border: 0; }
.editor:fullscreen .stage { min-height: 100%; }
.editor.theater { position: fixed; inset: 0; z-index: 200; border-radius: 0; margin: 0; }
.editor.theater .stage { min-height: 100%; }

.knobs { border-left: 1px solid var(--line); background: #fbfbfd; display: flex; flex-direction: column; }
.knobs-head {
  display: flex; align-items: center; gap: 8px; padding: 12px 14px; border-bottom: 1px solid var(--line-2);
}
.knobs-head h3 { font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-3); font-weight: 680; }
.btn-reset {
  margin-left: auto; font-family: var(--sans); font-size: 0.73rem; font-weight: 580; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--ink-2); padding: 4px 10px; border-radius: 7px;
}
.btn-reset:hover { border-color: var(--ink-3); color: var(--ink); }
.knobs-body { padding: 6px 14px 14px; overflow-y: auto; flex: 1; }
html:not(.js) .knobs { display: none; }        /* knobs are JS. Without JS the stage shows the static poster. */
html:not(.js) .editor { grid-template-columns: 1fr; }

.knob { padding: 13px 0; border-bottom: 1px solid var(--line-2); }
.knob:last-child { border-bottom: 0; }
.knob-top { display: flex; align-items: baseline; gap: 8px; margin-bottom: 7px; }
.knob-label { font-size: 0.82rem; font-weight: 600; color: var(--ink); font-family: var(--mono); letter-spacing: -0.01em; }
.knob-val {
  margin-left: auto; font-family: var(--mono); font-size: 0.76rem; color: var(--accent);
  background: rgba(63,79,216,.09); padding: 1px 6px; border-radius: 5px; font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.knob-src { font-family: var(--mono); font-size: 0.58rem; letter-spacing: .05em; text-transform: uppercase; padding: 1px 5px; border-radius: 4px; }
.knob-src.sourced { background: rgba(31,122,77,.13); color: #14603a; }
.knob-src.ours { background: rgba(63,79,216,.1); color: #2f3aa8; }
.knob-teach { font-size: 0.74rem; color: var(--ink-3); line-height: 1.45; margin-top: 7px; }

input[type=range] {
  width: 100%; -webkit-appearance: none; appearance: none; background: transparent; cursor: pointer; height: 18px; margin: 0;
}
input[type=range]::-webkit-slider-runnable-track { height: 4px; border-radius: 3px; background: rgba(22,24,31,.14); }
input[type=range]::-moz-range-track { height: 4px; border-radius: 3px; background: rgba(22,24,31,.14); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 15px; height: 15px; border-radius: 50%; background: var(--accent);
  border: 2.5px solid #fff; box-shadow: 0 1px 4px rgba(22,24,31,.3); margin-top: -5.5px;
}
input[type=range]::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%; background: var(--accent); border: 2.5px solid #fff;
  box-shadow: 0 1px 4px rgba(22,24,31,.3);
}
select, input[type=text] {
  width: 100%; font-family: var(--mono); font-size: 0.8rem; padding: 6px 9px; border-radius: 7px;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
}
select:hover, input[type=text]:hover { border-color: var(--ink-3); }
.knob-toggle { display: flex; align-items: center; gap: 9px; cursor: pointer; }
.knob-toggle input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

/* ---- evidence + spec blocks ------------------------------------------------------------------------ */
.spec { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1px; background: var(--line-2); border: 1px solid var(--line-2); border-radius: var(--radius); overflow: hidden; }
.spec > div { background: rgba(255,255,255,.8); padding: 15px 17px; }
.spec > div.wide { grid-column: 1 / -1; }
.spec dt { font-size: 0.68rem; font-weight: 680; letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.spec dd { margin: 0; font-size: 0.87rem; color: var(--ink-2); line-height: 1.5; }
.ev-detail { font-size: 0.84rem; color: var(--ink-2); line-height: 1.55; margin-top: 10px; }
.caveat {
  border-left: 3px solid var(--warm); background: rgba(255,247,242,.75); padding: 13px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: 0.87rem; color: #7d3a13; margin-top: 16px;
}
.caveat b { color: #5f2c0e; }
.builder {
  border-left: 3px solid var(--accent); background: rgba(247,248,255,.8); padding: 15px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: 0.94rem; color: var(--ink-2); max-width: 68ch;
}

.prevnext { display: flex; gap: 12px; margin-top: 54px; }
.prevnext a {
  flex: 1; text-decoration: none; color: inherit; padding: 14px 17px; border-radius: var(--radius);
  border: 1px solid var(--line-2); background: rgba(255,255,255,.7);
}
.prevnext a:hover { border-color: rgba(22,24,31,.24); background: #fff; }
.prevnext .dir { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-3); font-weight: 680; }
.prevnext .nm { font-weight: 620; letter-spacing: -0.02em; margin-top: 3px; }
.prevnext .r { text-align: right; }

@media (max-width: 900px) {
  .editor { grid-template-columns: 1fr; }
  .knobs { border-left: 0; border-top: 1px solid var(--line); }
  .knobs-body { max-height: 340px; }
  .stage { min-height: 340px; }
  .filters, .feat-nav { top: 54px; }
}
@media (max-width: 620px) {
  .hero { padding: 36px 0 18px; }
  .filters { padding: 8px 0; }
  .filter-row {
    flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none;
    scroll-snap-type: x proximity; padding-bottom: 2px;
  }
  .filter-row::-webkit-scrollbar { display: none; }
  .chip { flex: none; scroll-snap-align: start; }
  .grid { grid-template-columns: 1fr; }
  .prevnext { flex-direction: column; }
  .stage { min-height: 300px; }
  .feat-like { font-size: 1.06rem; }
}