:root{
  --bg:#07090f;--bg2:#0b0e15;--panel:#0e121b;--text:#eaecf2;--muted:#8b93a7;--dim:#7a849a;
  --acc:#6ef2c0;--acc2:#9a7cff;--acc2-light:#c3b1ff;
  --line:rgba(255,255,255,.08);--line2:rgba(255,255,255,.16);
  --face:#131927;--side:#0c1019;--side2:#10151f;
  --sans:'Space Grotesk',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans)}
body{min-height:100vh}
.wrap{max-width:1240px;margin:0 auto;padding:28px 16px 40px}
header h1{font-size:clamp(26px,4vw,40px);font-weight:600;letter-spacing:-.02em;margin:0 0 6px}
header p{color:var(--muted);margin:0;max-width:62ch;line-height:1.5}
.tag{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--acc);margin-bottom:10px}

.grid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;margin-top:22px}
@media (max-width:900px){.grid{grid-template-columns:minmax(0,1fr)}}

/* ---------- 3D stage ---------- */
.stage-card{position:relative;background:radial-gradient(120% 90% at 50% 40%,#0f1422 0%,var(--bg) 70%);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.stage{position:relative;height:clamp(420px,62vh,600px);perspective:1900px;perspective-origin:50% 35%;touch-action:none;cursor:grab;outline:none;user-select:none;-webkit-user-select:none}
.stage:active{cursor:grabbing}
.stage:focus-visible{box-shadow:inset 0 0 0 2px var(--acc)}
.world{position:absolute;left:50%;top:47%;width:0;height:0;transform-style:preserve-3d}
.smooth .world,.smooth .slab{transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.stack{position:absolute;transform-style:preserve-3d}
.slab{position:absolute;left:0;top:0;transform-style:preserve-3d}
.face{position:absolute;backface-visibility:visible}
.top{left:0;top:0;background:var(--face);border:1px solid var(--line2);border-radius:3px;overflow:hidden}
.bottom{left:0;top:0;background:var(--side)}
.side-y{left:0;transform-origin:0 0;background:var(--side2);border:1px solid var(--line)}
.side-x{top:0;transform-origin:0 0;background:var(--side);border:1px solid var(--line)}
.slab.hl .top{border-color:var(--acc);box-shadow:0 0 0 1px var(--acc),0 0 40px rgba(110,242,192,.25)}
.slab.hl .side-y,.slab.hl .side-x{background:#123329}
.slab .top{cursor:pointer}

.badge{position:absolute;left:10px;bottom:34px;width:24px;height:24px;border-radius:50%;background:var(--bg);border:1px solid var(--line2);font:600 12px/22px var(--mono);text-align:center;color:var(--text)}
.slab.hl .badge{background:var(--acc);color:#05110c;border-color:var(--acc)}
.lname{position:absolute;left:42px;bottom:38px;font:500 12px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}

/* layer contents */
.ticks{position:absolute;left:0;right:0;bottom:8px;height:18px}
.ticks span{position:absolute;bottom:0;font:10px var(--mono);color:var(--dim);transform:translateX(-50%)}
.ticks span::before{content:"";position:absolute;left:50%;bottom:14px;width:1px;height:6px;background:var(--line2)}
.file-main{position:absolute;left:24px;top:40px;display:flex;align-items:center;gap:16px}
.play{width:54px;height:54px;border-radius:12px;border:1px solid var(--line2);display:grid;place-items:center;background:#0b0f18}
.play::after{content:"";border-left:16px solid var(--acc);border-top:10px solid transparent;border-bottom:10px solid transparent;margin-left:4px}
.fname{font:600 20px var(--mono);letter-spacing:-.01em}
.fmeta{font:12px var(--mono);color:var(--muted);margin-top:4px}
.wave{position:absolute;left:0;top:20px;width:100%;height:160px}
.frames{position:absolute;left:0;top:30px;width:100%;height:120px}
.thumb{position:absolute;top:0;width:58px;height:40px;border-radius:4px;border:1px solid var(--line2);background:linear-gradient(160deg,#1c2436,#0d121c);transform:translateX(-50%)}
.thumb i{position:absolute;left:5px;right:5px;height:3px;border-radius:2px;background:rgba(195,177,255,.5)}
.thumb i:nth-child(1){top:7px;right:18px;background:var(--acc2-light)}
.thumb i:nth-child(2){top:16px;opacity:.5}
.thumb i:nth-child(3){top:23px;right:24px;opacity:.5}
.thumb b{position:absolute;top:44px;left:50%;transform:translateX(-50%);font:500 9px var(--mono);color:var(--dim);white-space:nowrap}
.thumb.on{border-color:var(--acc2);box-shadow:0 0 0 2px var(--acc2),0 0 24px rgba(154,124,255,.5)}
.thumb.on b{color:var(--acc2-light)}
.chips{position:absolute;left:0;top:28px;width:100%;height:150px}
.chip{position:absolute;padding:7px 9px;border-radius:6px;border:1px solid var(--line2);background:#0b0f18;font:500 11px var(--sans);color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chip.on{color:#05110c;background:var(--acc);border-color:var(--acc);font-weight:600}

/* time slice */
.slice{position:absolute;left:0;top:0;transform-origin:0 0;pointer-events:none;
  background:linear-gradient(90deg,rgba(110,242,192,.05),rgba(110,242,192,.18) 50%,rgba(110,242,192,.05));
  border-left:1px solid rgba(110,242,192,.6);border-right:1px solid rgba(110,242,192,.6)}
.guide{position:absolute;left:0;top:0;width:0;transform-origin:0 0;border-left:1px dashed rgba(255,255,255,.14);pointer-events:none}

/* overlay controls */
.hud{position:absolute;left:12px;right:12px;top:12px;display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;pointer-events:none}
.hud .grp{display:flex;gap:6px;pointer-events:auto;flex-wrap:wrap}
button{font:500 12px var(--sans);color:var(--text);background:rgba(14,18,27,.85);border:1px solid var(--line2);border-radius:999px;padding:7px 12px;cursor:pointer;backdrop-filter:blur(6px)}
button:hover{border-color:var(--acc)}
button[aria-pressed="true"]{background:var(--acc);color:#05110c;border-color:var(--acc)}
button:focus-visible,input:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
.hint{position:absolute;left:0;right:0;bottom:8px;padding:0 12px;text-align:center;font:11px var(--mono);color:var(--dim);pointer-events:none}

.controls{display:grid;grid-template-columns:auto 1fr auto;gap:10px 14px;align-items:center;padding:14px 16px;border-top:1px solid var(--line);background:rgba(11,14,21,.6)}
.controls label{font:11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.controls output{font:600 13px var(--mono);color:var(--acc);min-width:52px;text-align:right}
input[type=range]{width:100%;accent-color:var(--acc)}

/* side panel */
aside{display:flex;flex-direction:column;gap:14px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px}
.card h2{font:11px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;font-weight:500}
.legend{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.legend li button{all:unset;box-sizing:border-box;display:grid;grid-template-columns:28px 1fr;gap:10px;width:100%;padding:10px;border-radius:10px;cursor:pointer;border:1px solid transparent}
.legend li button:hover,.legend li button.active{background:#121827;border-color:var(--line2)}
.legend li button.active{border-color:var(--acc)}
.legend li button:focus-visible{outline:2px solid var(--acc)}
.legend .n{width:24px;height:24px;border-radius:50%;border:1px solid var(--line2);font:600 12px/22px var(--mono);text-align:center}
.legend button.active .n{background:var(--acc);color:#05110c;border-color:var(--acc)}
.legend strong{display:block;font-size:14px;font-weight:600}
.legend span.d{display:block;font-size:13px;color:var(--muted);line-height:1.45;margin-top:2px}
.readout dl{margin:0;display:grid;grid-template-columns:90px 1fr;gap:8px 10px;font-size:13px}
.readout dt{font:11px var(--mono);color:var(--dim);text-transform:uppercase;letter-spacing:.06em;padding-top:2px}
.readout dd{margin:0;color:var(--text);line-height:1.4}
.readout .t{font:600 22px var(--mono);color:var(--acc);margin-bottom:10px}
.fact{border-color:rgba(110,242,192,.35)}
.fact q{display:block;font-size:16px;font-weight:600}
.fact .src{font:12px var(--mono);color:var(--muted);margin:8px 0 12px}
.fact .src b{color:var(--acc);font-weight:600}
.note{font-size:12px;color:var(--dim);margin-top:18px}
.thumb,.chip{cursor:pointer}
/* focus mode: layers above the selected one fade out and let clicks through (opacity on the faces, not the slab, keeps 3D intact) */
.slab .face{transition:opacity .35s}
.slab.ghost .face{opacity:.12;pointer-events:none}
.slab.hover:not(.hl) .top{border-color:rgba(110,242,192,.45)}
.anchor{position:absolute;width:2px;height:2px;pointer-events:none}
.floor{position:absolute;pointer-events:none;border-radius:50%;
  background:radial-gradient(closest-side,rgba(110,242,192,.09),rgba(110,242,192,0) 75%),radial-gradient(closest-side,rgba(0,0,0,.6),rgba(0,0,0,0))}

/* anatomy callouts */
.callouts{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.callouts path{fill:none;stroke:rgba(234,236,242,.32);stroke-width:1}
.callouts path.on{stroke:var(--acc)}
.callouts circle{fill:var(--text)}
.callouts circle.on{fill:var(--acc)}
.clabel{position:absolute;left:14px;top:0;transform:translateY(-50%);display:flex;align-items:center;gap:8px;padding:4px 11px 4px 4px;border-radius:999px;background:rgba(10,13,20,.88);border:1px solid var(--line2);font:500 12px var(--sans);white-space:nowrap}
.clabel .n{width:20px;height:20px;border-radius:50%;border:1px solid var(--line2);font:600 11px/18px var(--mono);text-align:center}
.clabel.on{border-color:var(--acc)}
.clabel.on .n{background:var(--acc);color:#05110c;border-color:var(--acc)}
.stage.no-labels .callouts,.stage.no-labels .clabel{display:none}
@media (max-width:640px){.callouts,.clabel,#labels{display:none}}

/* hover tooltip */
.tip{position:absolute;left:0;top:0;pointer-events:none;padding:6px 9px;border-radius:8px;background:#0b0f18;border:1px solid var(--line2);font:12px var(--mono);color:var(--text);white-space:nowrap;opacity:0;transition:opacity .12s;z-index:5}
.tip.show{opacity:1}
.tip em{font-style:normal;color:var(--acc)}

/* threads from the traced fact to its evidence */
#threads{position:fixed;left:0;top:0;width:100vw;height:100vh;pointer-events:none;z-index:50;opacity:0;transition:opacity .5s}
#threads.show{opacity:1}
#threads path{fill:none;stroke:var(--acc);stroke-width:1.5;stroke-dasharray:5 5;animation:flow 1s linear infinite}
#threads circle{fill:var(--acc)}
@keyframes flow{to{stroke-dashoffset:-20}}
kbd{font:11px var(--mono);border:1px solid var(--line2);border-radius:4px;padding:0 4px}
@media (hover:none){.hint kbd{display:none}}
@media (prefers-reduced-motion:reduce){.smooth .world,.smooth .slab{transition:none}#threads path{animation:none}}

/* lanes: who spoke when */
.lanes{position:absolute;left:0;top:30px;width:100%;height:150px}
.lane{position:absolute;left:0;right:0;height:46px;border-top:1px dashed var(--line2)}
.lane>span{position:absolute;left:8px;top:-9px;padding:0 6px;background:var(--face);font:500 10px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--dim)}
.turn{position:absolute;top:10px;height:28px;border-radius:6px;cursor:pointer;border:1px solid transparent}
.turn.s0{background:rgba(154,124,255,.28)}
.turn.s1{background:rgba(110,242,192,.22)}
.turn.on.s0{background:var(--acc2);box-shadow:0 0 22px rgba(154,124,255,.6)}
.turn.on.s1{background:var(--acc);box-shadow:0 0 22px rgba(110,242,192,.5)}
.gapmark{position:absolute;top:118px;height:22px;border:1px dashed var(--line2);border-radius:6px;font:500 10px var(--mono);color:var(--dim);display:grid;place-items:center;letter-spacing:.06em;text-transform:uppercase}
.gapmark.on{border-color:var(--acc);color:var(--acc)}
.phone{width:54px;height:54px;border-radius:12px;border:1px solid var(--line2);display:grid;place-items:center;background:#0b0f18}
.phone svg{width:24px;height:24px;stroke:var(--acc);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* index of plates */
.plates{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:26px}
.plate{display:block;text-decoration:none;color:var(--text);background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;transition:border-color .2s,transform .2s}
.plate:hover,.plate:focus-visible{border-color:var(--acc);transform:translateY(-2px);outline:none}
.plate .tag{margin-bottom:8px}
.plate h2{font-size:22px;margin:0 0 6px;font-weight:600}
.plate p{color:var(--muted);margin:0;line-height:1.5;font-size:14px}
.back{display:inline-block;margin-bottom:14px;font:12px var(--mono);color:var(--muted);text-decoration:none}
.back:hover{color:var(--acc)}