/* ── CELL: silicon cathedral — black-chrome HUD ─────────────────────────── */
:root {
  --bg: #05070a;
  --panel: rgba(13, 17, 23, 0.86);
  --panel-edge: rgba(140, 170, 200, 0.16);
  --ink: #dfe7ee;
  --ink-dim: #8ba0b4;
  --acc: #6ef2c8;
  --amber: #ffb35c;
  --mono: "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: "SF Pro Display", "Segoe UI", Inter, system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); overflow: hidden; overscroll-behavior: none; }
#app { position: fixed; inset: 0; }
#gl { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; }
#gl:active { cursor: grabbing; }
.fallback-on #gl { display: none; }
button { font: inherit; color: inherit; }

/* ── top chrome ── */
.chrome { position: absolute; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; pointer-events: none;
  background: linear-gradient(180deg, rgba(5,7,10,.85), transparent); }
.chrome > * { pointer-events: auto; }
.brand { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.brand-mark { font: 800 22px/1 var(--sans); letter-spacing: .34em; color: #fff;
  text-shadow: 0 0 18px rgba(110,242,200,.6); }
.brand-sub { font: 400 11.5px/1.3 var(--sans); color: var(--ink-dim); letter-spacing: .04em;
  max-width: 46vw; }
.chrome-nav { display: flex; gap: 8px; align-items: center; }
.chipbtn { border: 1px solid var(--panel-edge); background: var(--panel);
  color: var(--ink); border-radius: 999px; padding: 7px 14px; font-size: 12.5px;
  letter-spacing: .06em; cursor: pointer; backdrop-filter: blur(10px);
  transition: border-color .2s, box-shadow .2s, background .2s; }
.chipbtn:hover { border-color: rgba(140,190,220,.5); box-shadow: 0 0 14px rgba(110,242,200,.18); }
.chipbtn.on { border-color: var(--acc); box-shadow: 0 0 16px rgba(110,242,200,.3); }
.view-toggle { position: relative; display: inline-flex; gap: 10px; padding: 7px 14px; }
.view-toggle i { position: absolute; top: 3px; bottom: 3px; left: 3px; width: calc(50% - 3px);
  border-radius: 999px; background: rgba(110,242,200,.18); border: 1px solid rgba(110,242,200,.5);
  transition: transform .28s cubic-bezier(.6,0,.2,1); content: ""; }
.view-toggle.story i { transform: translateX(100%); }
.view-toggle .vt-a, .view-toggle .vt-b { position: relative; z-index: 1; opacity: .55; }
.view-toggle:not(.story) .vt-a, .view-toggle.story .vt-b { opacity: 1; color: #bff5e2; }

/* ── floating 3D labels ── */
.labels { position: absolute; inset: 0; z-index: 10; pointer-events: none; overflow: hidden; }
.label { position: absolute; left: 0; top: 0; display: flex; align-items: center; gap: 6px;
  background: rgba(10,14,19,.72); border: 1px solid rgba(140,170,200,.22); color: var(--ink);
  border-radius: 999px; padding: 4px 10px 4px 7px; font: 600 11px/1 var(--mono);
  letter-spacing: .05em; cursor: pointer; pointer-events: auto; white-space: nowrap;
  backdrop-filter: blur(6px); transition: opacity .3s, border-color .2s, box-shadow .2s;
  will-change: transform; }
.label i { width: 6px; height: 6px; border-radius: 50%; background: var(--acc);
  box-shadow: 0 0 8px var(--acc); }
.label.off { opacity: 0; pointer-events: none; }
.label.active, .label:hover { border-color: var(--acc); box-shadow: 0 0 16px rgba(110,242,200,.25);
  background: rgba(16,22,28,.9); }
.label.die-label { font-size: 10px; border-color: rgba(255,179,92,.4); }
.label.die-label i { background: var(--amber); box-shadow: 0 0 8px var(--amber); }

/* ── info panel ── */
.panel { position: absolute; z-index: 25; top: 76px; right: 18px; width: min(360px, 88vw);
  max-height: calc(100% - 150px); overflow-y: auto;
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 16px;
  padding: 18px 18px 14px; backdrop-filter: blur(16px);
  transform: translateX(calc(100% + 30px)); transition: transform .38s cubic-bezier(.5,0,.15,1);
  box-shadow: 0 18px 50px rgba(0,0,0,.5); }
.panel.open { transform: translateX(0); }
.panel-x { position: absolute; top: 8px; right: 10px; border: 0; background: none;
  font-size: 20px; color: var(--ink-dim); cursor: pointer; padding: 4px 8px; }
.panel-x:hover { color: #fff; }
.panel-tag { font: 700 10px/1 var(--mono); letter-spacing: .18em; text-transform: uppercase;
  color: var(--acc, var(--acc)); color: var(--acc); }
.panel-tag[style] { color: var(--acc); }
.panel h2 { margin: 8px 0 8px; font-size: 19px; font-weight: 700; letter-spacing: .01em; }
.panel-text { font-size: 13.5px; line-height: 1.62; color: #c4d2de; margin: 0 0 12px; }
.specgrid { display: grid; gap: 5px; margin: 4px 0 10px; }
.specrow { display: flex; justify-content: space-between; gap: 12px; font-size: 11.5px;
  border-bottom: 1px solid rgba(140,170,200,.1); padding-bottom: 5px; }
.specrow span { color: var(--ink-dim); font-family: var(--mono); font-size: 10.5px;
  letter-spacing: .06em; text-transform: uppercase; padding-top: 1px; }
.specrow b { font-weight: 600; text-align: right; color: #e8f1f8; }
.panel-hint { font-size: 10.5px; color: var(--ink-dim); font-family: var(--mono); }
.story-mode .specgrid { opacity: .55; }

/* ── tour card ── */
.tourcard { position: absolute; z-index: 24; left: 18px; bottom: 18px; width: min(430px, 92vw);
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 16px;
  padding: 14px 16px; backdrop-filter: blur(16px);
  transform: translateY(calc(100% + 30px)); transition: transform .38s cubic-bezier(.5,0,.15,1);
  box-shadow: 0 18px 50px rgba(0,0,0,.5); }
.tourcard.open { transform: translateY(0); }
.tc-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.tc-step { font: 700 10px/1 var(--mono); color: var(--amber); letter-spacing: .15em; }
.tc-dots { display: flex; gap: 4px; flex: 1; }
.tc-dots i { width: 12px; height: 3px; border-radius: 2px; background: rgba(140,170,200,.25); }
.tc-dots i.on { background: var(--amber); box-shadow: 0 0 8px rgba(255,179,92,.6); }
.tc-x { border: 0; background: none; color: var(--ink-dim); font-size: 18px; cursor: pointer; padding: 2px 6px; }
.tc-x:hover { color: #fff; }
.tourcard h3 { margin: 8px 0 6px; font-size: 17px; }
.tourcard p { margin: 0 0 12px; font-size: 13px; line-height: 1.6; color: #c4d2de; }
.tc-nav { display: flex; gap: 8px; }
.tc-btn { flex: 1; border: 1px solid var(--panel-edge); background: rgba(20,26,34,.6);
  border-radius: 9px; padding: 8px 6px; font-size: 12px; cursor: pointer; color: var(--ink); }
.tc-btn:hover { border-color: var(--amber); }
.tc-auto { color: var(--amber); }

/* ── compare overlay ── */
.compare, .helpov { position: absolute; inset: 0; z-index: 40; display: flex;
  align-items: center; justify-content: center; padding: 20px;
  background: rgba(4,6,9,.72); backdrop-filter: blur(10px);
  opacity: 0; pointer-events: none; transition: opacity .3s; overflow-y: auto; }
.compare.open, .helpov.open { opacity: 1; pointer-events: auto; }
.cmp-card, .help-card { width: min(1060px, 96vw); max-height: 92vh; overflow-y: auto;
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 20px;
  padding: 22px 24px; box-shadow: 0 30px 80px rgba(0,0,0,.6); }
.cmp-card h2, .help-card h2 { margin: 0; font-size: 20px; }
.cmp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 18px 0; }
.cmp-col { border: 1px solid rgba(140,170,200,.14); border-radius: 14px; padding: 14px;
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent); }
.cmp-col h3 { margin: 0 0 2px; font-size: 16px; color: var(--c); }
.cmp-year { font: 400 10.5px/1.5 var(--mono); color: var(--ink-dim); margin-bottom: 10px; }
.cmp-row { margin-bottom: 10px; }
.cmp-row span { display: block; font: 700 9.5px/1 var(--mono); letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-dim); margin-bottom: 3px; }
.cmp-row b { display: block; font-size: 12px; font-weight: 600; margin-bottom: 5px; }
.cmp-row em { display: block; font: 400 10px/1.4 var(--mono); color: var(--ink-dim); font-style: normal; }
.bar { height: 5px; border-radius: 3px; background: rgba(140,170,200,.12); margin: 4px 0 3px; overflow: hidden; }
.bar i { display: block; height: 100%; border-radius: 3px; background: var(--c);
  box-shadow: 0 0 10px var(--c); }
.cmp-verdict { font-size: 12px; line-height: 1.55; color: #c4d2de; margin: 10px 0 0;
  border-top: 1px solid rgba(140,170,200,.12); padding-top: 10px; }
.cmp-notes { margin: 0; padding-left: 18px; font-size: 11.5px; line-height: 1.7; color: var(--ink-dim); }

/* ── help ── */
.help-card { width: min(520px, 94vw); }
.help-grid { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; margin-top: 16px; font-size: 12.5px; }
.help-k { font: 700 11px/1.6 var(--mono); color: var(--acc); white-space: nowrap;
  background: rgba(110,242,200,.08); border: 1px solid rgba(110,242,200,.25);
  border-radius: 6px; padding: 2px 8px; text-align: center; align-self: start; }
.help-foot { margin: 16px 0 0; font-size: 11px; color: var(--ink-dim); }

/* ── boot splash ── */
.boot { position: absolute; inset: 0; z-index: 60; display: flex; align-items: center;
  justify-content: center; background: radial-gradient(ellipse at 50% 40%, #0b1017 0%, #05070a 70%);
  transition: opacity .7s, visibility .7s; }
.boot.gone { opacity: 0; visibility: hidden; pointer-events: none; }
.boot-inner { text-align: center; padding: 20px; }
.boot-mark { font: 800 clamp(56px, 12vw, 120px)/1 var(--sans); letter-spacing: .3em;
  margin-left: .15em; color: #fff;
  text-shadow: 0 0 60px rgba(110,242,200,.55), 0 0 140px rgba(110,242,200,.25); }
.boot-sub { max-width: 480px; margin: 18px auto 30px; font-size: 14px; line-height: 1.65; color: var(--ink-dim); }
.boot-btn { border: 1px solid rgba(110,242,200,.5); background: rgba(110,242,200,.1);
  color: #d8fff0; border-radius: 999px; padding: 13px 34px; font-size: 14px; letter-spacing: .1em;
  cursor: pointer; transition: box-shadow .25s, background .25s; }
.boot-btn:hover { box-shadow: 0 0 30px rgba(110,242,200,.4); background: rgba(110,242,200,.18); }
.boot-foot { margin-top: 26px; font: 400 10px/1 var(--mono); color: #44566a; letter-spacing: .12em; }

/* ── hint toast ── */
.hint { position: absolute; z-index: 22; left: 50%; bottom: 20px; transform: translateX(-50%);
  font: 500 11.5px/1.5 var(--mono); color: var(--ink-dim); background: rgba(10,14,19,.75);
  border: 1px solid var(--panel-edge); border-radius: 999px; padding: 8px 18px;
  opacity: 0; transition: opacity .4s; pointer-events: none; white-space: nowrap;
  max-width: 92vw; overflow: hidden; text-overflow: ellipsis; }
.hint.show, .hint:first-of-type { opacity: 1; }

/* ── fallback 2D mode ── */
.fb-wrap { position: absolute; inset: 56px 0 0; z-index: 5; overflow-y: auto; padding: 12px 18px 30px; }
.fb-note { font: 500 11px/1.5 var(--mono); color: var(--amber); background: rgba(255,179,92,.08);
  border: 1px solid rgba(255,179,92,.3); border-radius: 10px; padding: 9px 14px; margin-bottom: 14px; }
.fb-board { display: grid; grid-template-columns: 1.5fr 1fr; gap: 16px; align-items: start; }
.fb-pcb { position: relative; aspect-ratio: 34/24; border-radius: 14px;
  background: linear-gradient(145deg, #0a0e13, #101720);
  border: 1px solid rgba(140,170,200,.18); box-shadow: inset 0 0 60px rgba(0,0,0,.6); }
.fb-wires { position: absolute; inset: 0; width: 100%; height: 100%; }
.fb-wires path { fill: none; stroke: rgba(110,242,200,.4); stroke-width: .5;
  stroke-dasharray: 2 1.4; animation: wireflow 2.4s linear infinite; }
@keyframes wireflow { to { stroke-dashoffset: -6.8; } }
.fb-chip { position: absolute; border: 1px solid var(--acc, #6ef2c8); border-radius: 7px;
  background: linear-gradient(160deg, rgba(30,38,48,.9), rgba(14,18,24,.95));
  color: var(--ink); font: 700 clamp(8px, 1.4vw, 11px)/1 var(--mono); letter-spacing: .04em;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 rgba(110,242,200,0); transition: box-shadow .2s, transform .15s; }
.fb-chip:hover, .fb-chip:focus-visible { box-shadow: 0 0 18px rgba(110,242,200,.35);
  transform: translateY(-1px); outline: none; }
.fb-chip span { background: rgba(6,9,12,.7); padding: 3px 6px; border-radius: 4px; }
.fb-die { border: 1px solid rgba(255,179,92,.3); border-radius: 14px; padding: 14px;
  background: linear-gradient(160deg, #141009, #0c0a06); }
.fb-die-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; margin-bottom: 8px; }
.fb-die-grid i { font: 600 9px/2.6 var(--mono); font-style: normal; text-align: center;
  background: rgba(255,179,92,.12); border: 1px solid rgba(255,179,92,.4); border-radius: 5px; color: var(--amber); }
.fb-die-row { display: flex; gap: 6px; margin-bottom: 8px; }
.fb-die-row b { flex: 1; font: 600 9px/2.6 var(--mono); text-align: center; border-radius: 5px; }
.fb-die-row .p { background: rgba(143,216,255,.12); border: 1px solid rgba(143,216,255,.45); color: #8fd8ff; }
.fb-die-row .m { background: rgba(201,159,255,.1); border: 1px solid rgba(201,159,255,.4); color: #c99fff; }
.fb-die-ring { font: 600 9px/1.8 var(--mono); text-align: center; color: #6ef2c8;
  border: 1px dashed rgba(110,242,200,.45); border-radius: 999px; }
.fb-tour-hint { margin-top: 14px; font: 500 11px/1.5 var(--mono); color: var(--ink-dim); }
.fallback-on .hint { display: none; }

/* ── small screens ── */
@media (max-width: 760px) {
  .chrome { padding: 10px 12px; }
  .brand { display: none; }
  .chrome { justify-content: flex-end; }
  .brand-mark { font-size: 17px; }
  .chipbtn { padding: 8px 11px; font-size: 11.5px; }
  .view-toggle { padding: 8px 10px; gap: 7px; }
  .panel { top: auto; bottom: 0; right: 0; left: 0; width: 100%; max-height: 52vh;
    border-radius: 18px 18px 0 0; transform: translateY(105%); padding: 16px 16px 20px; }
  .panel.open { transform: translateY(0); }
  .tourcard { left: 0; right: 0; bottom: 0; width: 100%; border-radius: 18px 18px 0 0; }
  .label { font-size: 10px; padding: 4px 8px 4px 6px; }
  .hint { bottom: auto; top: 54px; font-size: 10px; }
  .cmp-grid { grid-template-columns: 1fr; }
  .cmp-card, .help-card { padding: 16px; max-height: 88vh; }
  .fb-board { grid-template-columns: 1fr; }
  .boot-sub { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  .fb-wires path { animation: none; }
  .panel, .tourcard, .boot, .view-toggle i { transition-duration: .01s; }
}