/* ==========================================================================
   Neon Laboratory — theme for the Odyssey OLED G8 (G85SD) field manual
   Light is the subject: near-black bench, emissive accents in the panel's
   own primaries (OLED blue, QD red, QD green) plus a cyan instrument glow.
   ========================================================================== */

@font-face { font-family: 'Space Grotesk'; src: url('../fonts/space-grotesk-latin.woff2') format('woff2'); font-weight: 300 700; font-display: swap; }
@font-face { font-family: 'JetBrains Mono'; src: url('../fonts/jetbrains-mono-latin.woff2') format('woff2'); font-weight: 400 700; font-display: swap; }

:root {
  --bg: #030409;
  --bg-2: #070913;
  --panel: rgba(12, 16, 30, 0.72);
  --panel-solid: #0b0f1d;
  --line: rgba(120, 170, 255, 0.14);
  --line-2: rgba(120, 170, 255, 0.28);
  --ink: #e7ecff;
  --ink-2: #aab3d6;
  --ink-3: #6f7899;
  --cyan: #3ef2ff;
  --blue: #3d6bff;
  --qd-red: #ff3b4e;
  --qd-green: #3bff8a;
  --magenta: #ff3ea5;
  --amber: #ffb03e;
  --glow-cyan: 0 0 18px rgba(62, 242, 255, 0.45);
  --radius: 14px;
  --radius-s: 9px;
  --font: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --gutter: clamp(16px, 4vw, 48px);
  --maxw: 1320px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
/* the hidden attribute always wins over component display rules */
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; } }
body {
  margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font);
  font-size: clamp(15px, 0.35vw + 14px, 17px); line-height: 1.6; overflow-x: hidden;
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(61, 107, 255, 0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(255, 62, 165, 0.07), transparent 60%);
  background-attachment: fixed;
}
body::before { /* scanline / dust veil */
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 100; opacity: 0.35;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.012) 0 1px, transparent 1px 3px);
  mix-blend-mode: overlay;
}
img, canvas, svg { display: block; max-width: 100%; }
a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-shadow: var(--glow-cyan); }
h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; margin: 0 0 0.5em; }
h2 { font-size: clamp(30px, 4.2vw, 58px); }
h3 { font-size: clamp(22px, 2.3vw, 32px); }
h4 { font-size: 19px; }
p { margin: 0 0 1em; color: var(--ink-2); }
strong { color: var(--ink); font-weight: 600; }
code, kbd, .mono { font-family: var(--mono); font-size: 0.88em; }
kbd { border: 1px solid var(--line-2); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; background: #0d1224; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 300; background: var(--cyan); color: #000; padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 8px; }

/* ---------- top bar ---------- */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 90; display: flex; align-items: center; gap: 14px;
  padding: 10px var(--gutter); background: linear-gradient(180deg, rgba(3, 4, 9, 0.92), rgba(3, 4, 9, 0.6));
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 600; white-space: nowrap; }
.brand-mark { width: 26px; height: 26px; border-radius: 7px; position: relative; background: #000; box-shadow: inset 0 0 0 1px var(--line-2); overflow: hidden; }
.brand-mark i { position: absolute; width: 8px; height: 8px; border-radius: 2px; }
.brand-mark i:nth-child(1) { background: var(--qd-green); left: 9px; top: 4px; box-shadow: 0 0 8px var(--qd-green); }
.brand-mark i:nth-child(2) { background: var(--qd-red); left: 4px; top: 14px; box-shadow: 0 0 8px var(--qd-red); }
.brand-mark i:nth-child(3) { background: var(--blue); left: 14px; top: 14px; box-shadow: 0 0 8px var(--blue); }
.brand small { color: var(--ink-3); font-weight: 400; font-family: var(--mono); font-size: 11px; }
.chapters { display: flex; gap: 2px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.chapters::-webkit-scrollbar { display: none; }
.chapters a {
  color: var(--ink-3); text-decoration: none; font-family: var(--mono); font-size: 12px; padding: 6px 10px; border-radius: 999px; white-space: nowrap; transition: color .2s, background .2s;
}
.chapters a:hover { color: var(--ink); text-shadow: none; }
.chapters a.is-active { color: #001015; background: var(--cyan); box-shadow: var(--glow-cyan); }
.audio-ctl { display: flex; gap: 6px; }
.icon-btn {
  display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line-2);
  background: rgba(10, 14, 28, 0.8); color: var(--ink-2); font: 500 12px var(--mono); cursor: pointer; white-space: nowrap;
}
.icon-btn:hover { color: var(--ink); border-color: var(--cyan); }
.icon-btn[aria-pressed='true'] { color: #001015; background: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow-cyan); }
.icon-btn svg { width: 15px; height: 15px; }
@media (max-width: 900px) {
  .topbar { backdrop-filter: none; -webkit-backdrop-filter: none; background: rgba(3, 4, 9, 0.94); }
  .chapters { position: fixed; left: 0; right: 0; bottom: 0; margin: 0; padding: 8px 10px calc(8px + env(safe-area-inset-bottom)); background: rgba(3, 4, 9, 0.94); border-top: 1px solid var(--line); backdrop-filter: blur(12px); }
  .brand small { display: none; }
  .icon-btn .lbl { display: none; }
  .icon-btn { padding: 0 10px; }
  .audio-ctl { margin-left: auto; }
}

/* ---------- layout ---------- */
main { position: relative; }
.chapter { position: relative; padding: clamp(80px, 12vh, 140px) var(--gutter) clamp(40px, 8vh, 90px); max-width: var(--maxw); margin: 0 auto; }
.chapter-head { max-width: 860px; margin-bottom: clamp(24px, 4vh, 48px); }
.kicker { display: inline-flex; align-items: center; gap: 10px; font: 500 12px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--cyan); margin-bottom: 14px; }
.kicker::before { content: ''; width: 26px; height: 1px; background: currentColor; box-shadow: var(--glow-cyan); }
.lede { font-size: clamp(17px, 1.3vw, 21px); color: var(--ink-2); max-width: 70ch; }
.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line-2), transparent); margin: 0 var(--gutter); }

/* ---------- hero ---------- */
.hero { min-height: 100svh; display: grid; align-items: center; padding-top: 90px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; }
.hero h1 { font-size: clamp(40px, 7.4vw, 108px); line-height: 0.95; letter-spacing: -0.045em; margin-bottom: 18px; }
.hero h1 .glow { color: transparent; background: linear-gradient(92deg, var(--qd-red), var(--magenta) 30%, var(--blue) 60%, var(--cyan) 80%, var(--qd-green)); -webkit-background-clip: text; background-clip: text; filter: drop-shadow(0 0 22px rgba(62, 242, 255, 0.28)); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 26px; }
.chip { font: 500 12px var(--mono); color: var(--ink-2); padding: 6px 10px; border: 1px solid var(--line-2); border-radius: 999px; background: rgba(10, 14, 28, 0.6); }
.chip b { color: var(--cyan); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-arc { position: relative; height: clamp(160px, 26vw, 330px); margin-top: 10px; }
.hero-arc svg { width: 100%; height: 100%; overflow: visible; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 40px; padding: 8px 16px; border-radius: 999px;
  border: 1px solid var(--line-2); background: rgba(12, 17, 33, 0.8); color: var(--ink); font: 500 14px var(--font); cursor: pointer; text-decoration: none;
  transition: border-color .2s, box-shadow .2s, background .2s, transform .1s;
}
.btn:hover { border-color: var(--cyan); box-shadow: var(--glow-cyan); text-shadow: none; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--cyan); color: #001317; border-color: var(--cyan); font-weight: 600; box-shadow: 0 0 26px rgba(62, 242, 255, 0.35); }
.btn.primary:hover { box-shadow: 0 0 40px rgba(62, 242, 255, 0.6); }
.btn.ghost { background: transparent; }
.btn.stop { font: 500 12px var(--mono); min-height: 34px; padding: 6px 12px; }
.btn.is-speaking, [data-narrate].is-speaking { border-color: var(--magenta); color: var(--ink); box-shadow: 0 0 20px rgba(255, 62, 165, 0.45); }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
.listen {
  display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line-2); background: rgba(12, 17, 33, 0.7); color: var(--ink-2);
  font: 500 12px var(--mono); padding: 6px 12px 6px 8px; border-radius: 999px; cursor: pointer;
}
.listen::before { content: ''; width: 18px; height: 18px; border-radius: 50%; background: var(--cyan) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M3 2l5 3-5 3z' fill='%23001317'/%3E%3C/svg%3E") center/10px no-repeat; box-shadow: var(--glow-cyan); }
.listen:hover { color: var(--ink); border-color: var(--cyan); }
.listen.is-speaking::before { background-color: var(--magenta); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 6px rgba(255, 62, 165, 0.15), 0 0 20px var(--magenta); } }

/* ---------- lab blocks ---------- */
.lab { position: relative; margin: 0 0 clamp(56px, 9vh, 110px); }
.lab-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 18px; margin-bottom: 16px; }
.lab-no { font: 600 12px var(--mono); color: var(--magenta); letter-spacing: .14em; }
.lab-head h3 { margin: 0; }
.lab-head .listen { margin-left: auto; }
.lab-intro { max-width: 76ch; }
.lab-grid { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(280px, 1fr); gap: 18px; align-items: start; }
.lab-grid.wide { grid-template-columns: minmax(0, 1fr); }
.lab-stage {
  position: relative; border-radius: var(--radius); overflow: hidden; background: #020308; border: 1px solid var(--line);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), 0 30px 80px -30px rgba(61, 107, 255, 0.35), inset 0 0 60px rgba(62, 242, 255, 0.04);
}
.lab-stage::after { /* instrument corner ticks */
  content: ''; position: absolute; inset: 8px; pointer-events: none; border-radius: 8px;
  background:
    linear-gradient(var(--cyan), var(--cyan)) top left / 14px 1px no-repeat, linear-gradient(var(--cyan), var(--cyan)) top left / 1px 14px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) top right / 14px 1px no-repeat, linear-gradient(var(--cyan), var(--cyan)) top right / 1px 14px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) bottom left / 14px 1px no-repeat, linear-gradient(var(--cyan), var(--cyan)) bottom left / 1px 14px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) bottom right / 14px 1px no-repeat, linear-gradient(var(--cyan), var(--cyan)) bottom right / 1px 14px no-repeat;
  opacity: 0.5;
}
.lab-canvas { width: 100%; aspect-ratio: 16 / 9; image-rendering: auto; touch-action: pan-y; cursor: default; }
.lab-canvas.interactive, .lab-canvas.topdown { touch-action: none; cursor: grab; }
.lab-canvas.interactive:active, .lab-canvas.topdown:active { cursor: grabbing; }
.lab-canvas.live { aspect-ratio: 1100 / 380; cursor: default; }
.lab-canvas.pursuit { aspect-ratio: 720 / 300; cursor: default; }
.lab-canvas.scope { aspect-ratio: 900 / 340; cursor: default; }
.lab-canvas.lanes { aspect-ratio: 720 / 220; cursor: default; }
.lab-canvas.topdown { aspect-ratio: 10 / 7; }
.lab-canvas.hdr { aspect-ratio: 16 / 9; cursor: default; }
.lab-canvas.curve { aspect-ratio: 800 / 300; cursor: default; }
.canvas-cap { font: 500 11px var(--mono); color: var(--ink-3); padding: 10px 14px 8px; letter-spacing: .04em; border-top: 1px solid var(--line); }
.canvas-cap:first-child { border-top: 0; }
.canvas-cap b { color: var(--cyan); font-weight: 600; margin-right: 4px; }
.lab-controls {
  display: grid; gap: 16px; padding: 18px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); position: sticky; top: 76px;
}
.lab-notes { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-top: 4px; }
.note { padding: 16px 18px; border-radius: var(--radius-s); border: 1px solid var(--line); background: rgba(8, 11, 22, 0.6); }
.note h4 { font-size: 15px; margin-bottom: 6px; color: var(--ink); }
.note p { font-size: 14.5px; margin: 0; }
.note .src { display: block; margin-top: 8px; font: 11px var(--mono); color: var(--ink-3); }
.note.warn { border-color: rgba(255, 176, 62, 0.35); }
.note.warn h4 { color: var(--amber); }
.fine { font-size: 12.5px; color: var(--ink-3); margin: 0; }
@media (max-width: 960px) {
  .lab-grid { grid-template-columns: minmax(0, 1fr); }
  .lab-controls { position: relative; top: 0; }
}

/* ---------- controls kit ---------- */
.ctl { display: grid; gap: 8px; }
.ctl-label { display: flex; justify-content: space-between; gap: 10px; font: 500 12px var(--mono); color: var(--ink-3); letter-spacing: .04em; text-transform: uppercase; }
.ctl-val { color: var(--cyan); text-transform: none; letter-spacing: 0; text-align: right; }
.seg { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; border-radius: 12px; background: rgba(0, 0, 0, 0.35); border: 1px solid var(--line); }
.seg-btn { flex: 1 1 auto; min-height: 36px; padding: 6px 10px; border: 0; border-radius: 9px; background: transparent; color: var(--ink-2); font: 500 13px var(--font); cursor: pointer; transition: background .2s, color .2s, box-shadow .2s; }
.seg-btn:hover { color: var(--ink); background: rgba(62, 242, 255, 0.06); }
.seg-btn.is-on { background: linear-gradient(180deg, rgba(62, 242, 255, 0.22), rgba(62, 242, 255, 0.1)); color: var(--ink); box-shadow: inset 0 0 0 1px rgba(62, 242, 255, 0.5), 0 0 18px rgba(62, 242, 255, 0.18); }
.range { -webkit-appearance: none; appearance: none; width: 100%; height: 28px; background: transparent; cursor: pointer; --p: 50%; }
.range::-webkit-slider-runnable-track { height: 4px; border-radius: 4px; background: linear-gradient(90deg, var(--cyan) var(--p), rgba(255, 255, 255, 0.1) var(--p)); box-shadow: 0 0 10px rgba(62, 242, 255, 0.25); }
.range::-moz-range-track { height: 4px; border-radius: 4px; background: rgba(255, 255, 255, 0.1); }
.range::-moz-range-progress { height: 4px; border-radius: 4px; background: var(--cyan); }
.range::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; margin-top: -8px; border-radius: 50%; background: #031014; border: 2px solid var(--cyan); box-shadow: 0 0 14px var(--cyan); }
.range::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: #031014; border: 2px solid var(--cyan); box-shadow: 0 0 14px var(--cyan); }
.sw { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: 14px; color: var(--ink-2); }
.sw-input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.sw-track { flex: none; width: 38px; height: 22px; border-radius: 22px; background: rgba(255, 255, 255, 0.08); border: 1px solid var(--line-2); position: relative; transition: background .2s, box-shadow .2s; }
.sw-dot { position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 50%; background: var(--ink-3); transition: transform .2s, background .2s; }
.sw-input:checked + .sw-track { background: rgba(62, 242, 255, 0.2); box-shadow: 0 0 14px rgba(62, 242, 255, 0.3); border-color: var(--cyan); }
.sw-input:checked + .sw-track .sw-dot { transform: translateX(16px); background: var(--cyan); }
.sw-input:focus-visible + .sw-track { outline: 2px solid var(--cyan); outline-offset: 2px; }
.readout { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 0; padding: 12px 14px; border-radius: 10px; background: rgba(0, 0, 0, 0.35); border: 1px solid var(--line); font-size: 13px; }
.readout dt { font: 500 11px var(--mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; padding-top: 2px; }
.readout dd { margin: 0; color: var(--ink); font-family: var(--mono); font-size: 12.5px; }
.stop-bar { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- subpixel scope ---------- */
.scope-hud { position: absolute; inset: 0; pointer-events: none; }
.scope-hud::before, .scope-hud::after { content: ''; position: absolute; left: 50%; top: 50%; background: rgba(62, 242, 255, 0.55); box-shadow: var(--glow-cyan); }
.scope-hud::before { width: 28px; height: 1px; transform: translate(-50%, -50%); }
.scope-hud::after { width: 1px; height: 28px; transform: translate(-50%, -50%); }
.scale-bar { position: absolute; left: 16px; bottom: 14px; display: grid; gap: 4px; pointer-events: none; font: 500 11px var(--mono); color: var(--ink); text-shadow: 0 0 6px #000; }
.scale-line { display: block; width: var(--len, 80px); height: 6px; border: 1px solid var(--cyan); border-top: 0; box-shadow: 0 2px 8px rgba(62, 242, 255, 0.35); transition: width .2s; }
.scope-note { position: absolute; right: 14px; bottom: 12px; max-width: min(360px, 60%); margin: 0; padding: 8px 12px; border-radius: 10px; font-size: 13px; color: var(--ink); background: rgba(3, 4, 9, 0.72); border: 1px solid var(--line-2); backdrop-filter: blur(6px); }
.scope-note.flash { animation: noteIn .5s ease-out; }
@keyframes noteIn { from { opacity: 0; transform: translateY(8px); } }
@media (max-width: 600px) { .scope-note { position: static; max-width: none; border-radius: 0; border-width: 1px 0 0; } }

/* ---------- blacks split ---------- */
.split-tag { position: absolute; top: 12px; font: 600 11px var(--mono); letter-spacing: .08em; padding: 5px 9px; border-radius: 999px; background: rgba(3, 4, 9, 0.7); border: 1px solid var(--line-2); }
.split-tag.left { left: 12px; color: var(--amber); }
.split-tag.right { right: 12px; color: var(--cyan); }
.split-line { position: absolute; top: 0; bottom: 0; left: 50%; width: 1px; background: linear-gradient(transparent, var(--cyan), transparent); box-shadow: var(--glow-cyan); }

/* ---------- HDR ---------- */
.false-legend { position: absolute; right: 12px; top: 12px; display: flex; align-items: center; gap: 6px; font: 500 10px var(--mono); padding: 5px 8px; border-radius: 8px; background: rgba(3, 4, 9, 0.8); }
.false-legend i { width: 110px; height: 8px; border-radius: 4px; background: linear-gradient(90deg, #0000ff, #00ffff, #00ff00, #ffff00, #ff0000, #fff); }

/* ---------- burn-in ---------- */
.burn-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 14px; }
.burn-fig { margin: 0; }
.burn-canvas { width: 100%; aspect-ratio: 344 / 144; image-rendering: pixelated; border-radius: 8px; border: 1px solid var(--line); background: #000; }
.burn-fig figcaption { font: 500 11px var(--mono); color: var(--ink-3); margin-top: 6px; }
.burn-fig:last-child figcaption { color: var(--cyan); }
.burn-fig.pulse .burn-canvas { animation: refreshPulse 1.1s ease-out; }
@keyframes refreshPulse { 0% { box-shadow: 0 0 0 0 rgba(62, 242, 255, 0.8); filter: brightness(1.8); } 100% { box-shadow: 0 0 0 16px rgba(62, 242, 255, 0); } }
.burn-clock { display: flex; align-items: baseline; gap: 10px; padding: 0 14px 14px; }
.burn-hours { font: 600 clamp(26px, 4vw, 44px) var(--mono); color: var(--ink); text-shadow: var(--glow-cyan); }
.burn-sub { font: 12px var(--mono); color: var(--ink-3); }
.care-toggles { display: grid; gap: 10px; }
@media (max-width: 560px) { .burn-pair { grid-template-columns: 1fr; } }

/* ---------- specimen ---------- */
.specimen { max-width: none; padding-left: 0; padding-right: 0; }
.specimen .chapter-head, .specimen .lab-grid { padding: 0 var(--gutter); max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.specimen .lab-stage { min-height: 0; }
.specimen-canvas { width: 100%; height: min(78vh, 760px); min-height: 420px; touch-action: none; cursor: grab; }
.specimen-canvas:active { cursor: grabbing; }
@media (max-width: 600px) { .specimen-canvas { height: 62vh; min-height: 360px; } }
.specimen-loading { transition: opacity .5s; position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 14px; font: 13px var(--mono); color: var(--ink-2); background: #030409; }
.spinner { width: 34px; height: 34px; border-radius: 50%; border: 2px solid rgba(62, 242, 255, 0.15); border-top-color: var(--cyan); animation: spin 0.9s linear infinite; box-shadow: var(--glow-cyan); }
@keyframes spin { to { transform: rotate(360deg); } }
.specimen-hint { position: absolute; left: 14px; bottom: 12px; font: 11px var(--mono); color: var(--ink-3); pointer-events: none; }
@media (max-width: 600px) { .specimen-hint { display: none; } }
.part-labels { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.part-tag {
  position: absolute; left: 0; top: 0; pointer-events: auto; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font: 500 11px var(--mono); color: var(--ink); padding: 4px 9px 4px 4px; border-radius: 999px; cursor: pointer;
  background: rgba(3, 4, 9, 0.78); border: 1px solid var(--line-2); transition: opacity .2s, border-color .2s, box-shadow .2s; margin: -12px 0 0 8px;
}
.part-tag::before { content: ''; position: absolute; left: -9px; top: 50%; width: 8px; height: 1px; background: var(--cyan); }
.part-tag i { font-style: normal; display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--cyan); color: #001317; font-weight: 700; font-size: 10px; }
.part-tag.g-ports i { background: var(--magenta); }
.part-tag:hover, .part-tag.is-on { border-color: var(--cyan); box-shadow: var(--glow-cyan); z-index: 2; }
@media (max-width: 600px) { .part-tag span { display: none; } .part-tag { padding: 3px; } }
.part-card {
  position: absolute; right: 14px; top: 14px; width: min(360px, calc(100% - 28px)); max-height: calc(100% - 28px); overflow: auto; padding: 18px 18px 16px;
  border-radius: 14px; background: rgba(6, 9, 19, 0.9); border: 1px solid var(--line-2); box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(62, 242, 255, 0.12);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); animation: noteIn .3s ease-out;
}
.part-card h4 { margin: 4px 0 8px; font-size: 20px; }
.part-card p { font-size: 14px; }
.card-kicker { font: 600 11px var(--mono); color: var(--magenta); letter-spacing: .12em; }
.card-spec { font: 12px var(--mono); color: var(--cyan) !important; }
.card-x { position: absolute; right: 10px; top: 8px; width: 30px; height: 30px; border: 0; border-radius: 50%; background: transparent; color: var(--ink-2); font-size: 20px; cursor: pointer; }
.card-x:hover { color: var(--ink); background: rgba(255, 255, 255, 0.06); }
@media (max-width: 600px) { .part-card { top: auto; bottom: 10px; right: 10px; max-height: 55%; } }

/* ---------- captions rail ---------- */
.caption-rail {
  position: fixed; left: 50%; bottom: 22px; z-index: 95; width: min(760px, calc(100% - 24px)); transform: translate(-50%, 140%);
  padding: 14px 18px 16px; border-radius: 16px; background: rgba(4, 6, 14, 0.9); border: 1px solid var(--line-2);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 30px rgba(255, 62, 165, 0.12); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: transform .45s cubic-bezier(.2, .8, .2, 1);
}
.caption-rail.is-open { transform: translate(-50%, 0); }
@media (max-width: 900px) { .caption-rail { bottom: calc(64px + env(safe-area-inset-bottom)); } }
.caption-top { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.caption-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--magenta); box-shadow: 0 0 10px var(--magenta); animation: pulse 1.2s infinite; }
.caption-title { font: 600 11px var(--mono); color: var(--magenta); letter-spacing: .12em; text-transform: uppercase; }
.caption-top .icon-btn { height: 28px; margin-left: auto; }
.caption-top .icon-btn + .icon-btn { margin-left: 0; }
.caption-text { margin: 0; color: var(--ink); font-size: clamp(15px, 1.2vw, 18px); line-height: 1.5; min-height: 1.5em; }
.caption-progress { position: absolute; left: 18px; right: 18px; bottom: 7px; height: 2px; background: var(--magenta); transform-origin: left; transform: scaleX(0); box-shadow: 0 0 8px var(--magenta); border-radius: 2px; }

/* ---------- unboxing ---------- */
.unbox { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 20px; align-items: stretch; }
.unbox-stage { position: relative; min-height: 440px; border-radius: var(--radius); border: 1px solid var(--line); background: radial-gradient(ellipse at 50% 80%, rgba(62, 242, 255, 0.08), transparent 60%), #030409; overflow: hidden; }
.unbox-stage svg { width: 100%; height: 100%; position: absolute; inset: 0; }
.unbox-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.unbox-item { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: rgba(8, 11, 22, 0.55); cursor: pointer; transition: border-color .2s, background .2s, transform .2s; }
.unbox-item:hover, .unbox-item.is-on { border-color: var(--cyan); background: rgba(62, 242, 255, 0.06); }
.unbox-item.is-out { transform: translateX(4px); }
.unbox-item .n { font: 600 12px var(--mono); color: var(--cyan); padding-top: 3px; }
.unbox-item h4 { margin: 0 0 2px; font-size: 16px; }
.unbox-item p { margin: 0; font-size: 13.5px; }
.unbox-item .tag { font: 10px var(--mono); color: var(--amber); }
@media (max-width: 900px) { .unbox { grid-template-columns: 1fr; } .unbox-stage { min-height: 320px; } }

/* ---------- steps (setup & calibration) ---------- */
.steps { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 20px; }
.step-nav { display: grid; gap: 6px; align-content: start; position: sticky; top: 80px; }
.step-nav button { display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: center; text-align: left; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); background: rgba(8, 11, 22, 0.55); color: var(--ink-2); font: 500 14px var(--font); cursor: pointer; }
.step-nav button i { font: 600 11px var(--mono); font-style: normal; color: var(--ink-3); width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; border: 1px solid var(--line-2); }
.step-nav button.is-on { color: var(--ink); border-color: var(--cyan); box-shadow: 0 0 18px rgba(62, 242, 255, 0.15); }
.step-nav button.is-on i { background: var(--cyan); color: #001317; border-color: var(--cyan); }
.step-nav button.is-done i { background: rgba(59, 255, 138, 0.2); color: var(--qd-green); border-color: var(--qd-green); }
.step-panel { padding: clamp(18px, 3vw, 30px); border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); min-height: 380px; }
.step-panel h4 { font-size: clamp(20px, 2vw, 26px); }
.step-panel ol, .step-panel ul { padding-left: 1.2em; color: var(--ink-2); }
.step-panel li { margin-bottom: 6px; }
.step-figure { margin: 16px 0; border-radius: 12px; border: 1px solid var(--line); background: #030409; padding: 12px; }
.step-figure svg { width: 100%; height: auto; max-height: 280px; }
.step-foot { display: flex; justify-content: space-between; gap: 10px; margin-top: 18px; }
.check { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; color: var(--ink-2); font-size: 15px; cursor: pointer; }
.check input { accent-color: var(--cyan); width: 18px; height: 18px; margin-top: 3px; }
.test-pattern { width: 100%; aspect-ratio: 21 / 9; border-radius: 10px; border: 1px solid var(--line); cursor: zoom-in; }
.test-full { position: fixed; inset: 0; z-index: 200; background: #000; display: grid; place-items: center; cursor: zoom-out; }
.test-full canvas { width: 100%; height: 100%; }
.test-full .test-hint { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); font: 12px var(--mono); color: #666; }
@media (max-width: 900px) { .steps { grid-template-columns: 1fr; } .step-nav { position: static; grid-auto-flow: column; grid-auto-columns: max-content; overflow-x: auto; } .step-nav button { grid-template-columns: 26px auto; } }

/* ---------- ports / connection guide ---------- */
.conn { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 20px; }
.port-strip { position: relative; padding: 24px 18px 18px; border-radius: var(--radius); border: 1px solid var(--line); background: linear-gradient(180deg, #0d1120, #05070e); }
.port-strip svg { width: 100%; height: auto; }
.port-hit { cursor: pointer; }
.port-hit rect.body { transition: stroke .2s, filter .2s; }
.port-hit:hover rect.body, .port-hit.is-on rect.body { stroke: var(--cyan); filter: drop-shadow(0 0 6px var(--cyan)); }
.port-hit.is-on text { fill: var(--cyan); }
.conn-matrix { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.conn-matrix th, .conn-matrix td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.conn-matrix th { font: 500 11px var(--mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; }
.conn-matrix tr.is-on td { background: rgba(62, 242, 255, 0.06); color: var(--ink); }
.conn-matrix td b { color: var(--cyan); }
.table-wrap { overflow-x: auto; border-radius: 12px; border: 1px solid var(--line); background: rgba(6, 9, 18, 0.6); }
.conn-result { padding: 18px; border-radius: var(--radius); border: 1px solid var(--line-2); background: var(--panel); }
.conn-result .big { font: 600 clamp(30px, 4vw, 48px) var(--mono); color: var(--ink); text-shadow: var(--glow-cyan); line-height: 1; margin: 6px 0 10px; }
.conn-result .big small { font-size: 0.4em; color: var(--ink-3); }
.pill { display: inline-block; font: 600 10px var(--mono); padding: 3px 7px; border-radius: 999px; border: 1px solid currentColor; letter-spacing: .06em; }
.pill.ok { color: var(--qd-green); } .pill.warn { color: var(--amber); } .pill.info { color: var(--cyan); }
@media (max-width: 900px) { .conn { grid-template-columns: 1fr; } }

/* ---------- OSD replica ---------- */
.osd-wrap { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr); gap: 20px; align-items: start; }
.osd-screen {
  position: relative; aspect-ratio: 21 / 9; border-radius: 16px; overflow: hidden; border: 1px solid var(--line-2);
  background: radial-gradient(ellipse at 70% 40%, rgba(255, 62, 165, 0.25), transparent 50%), radial-gradient(ellipse at 20% 80%, rgba(61, 107, 255, 0.3), transparent 50%), #04030a;
  box-shadow: 0 0 0 10px #0a0b10, 0 0 0 11px var(--line), 0 40px 90px -30px rgba(61, 107, 255, 0.4);
  container-type: inline-size;
}
.osd-panel {
  position: absolute; left: 4%; top: 8%; bottom: 8%; width: min(62%, 560px); display: grid; grid-template-columns: 38% 62%; border-radius: 12px; overflow: hidden;
  background: rgba(18, 20, 28, 0.92); border: 1px solid rgba(255, 255, 255, 0.08); font-size: clamp(9px, 1.45cqi, 14px); backdrop-filter: blur(8px);
}
.osd-col { overflow-y: auto; scrollbar-width: thin; padding: 6px 0; }
.osd-col + .osd-col { border-left: 1px solid rgba(255, 255, 255, 0.07); }
.osd-row { display: flex; justify-content: space-between; align-items: center; gap: 6px; width: 100%; padding: 0.55em 0.9em; border: 0; background: transparent; color: #d9dbe4; font: 500 1em var(--font); text-align: left; cursor: pointer; }
.osd-row .val { color: #8b90a5; font-size: 0.9em; }
.osd-row:hover { background: rgba(255, 255, 255, 0.05); }
.osd-row.is-on { background: #e9ecf5; color: #0b0d14; }
.osd-row.is-on .val { color: #3a4055; }
.osd-row.is-path { color: #fff; background: rgba(255, 255, 255, 0.08); }
.osd-row.is-disabled { opacity: 0.4; }
.osd-head { padding: 0.6em 0.9em 0.3em; font: 600 0.8em var(--mono); color: #7d8298; letter-spacing: .08em; text-transform: uppercase; }
.osd-opts { padding: 0.3em 0.6em; display: grid; gap: 2px; }
.osd-opt { display: flex; align-items: center; gap: 0.6em; padding: 0.5em 0.6em; border-radius: 6px; border: 0; background: transparent; color: #cfd2de; font: 500 1em var(--font); text-align: left; cursor: pointer; }
.osd-opt::before { content: ''; width: 0.8em; height: 0.8em; border-radius: 50%; border: 1.5px solid #6b7088; flex: none; }
.osd-opt.is-sel::before { background: var(--cyan); border-color: var(--cyan); box-shadow: 0 0 6px var(--cyan); }
.osd-opt:hover { background: rgba(255, 255, 255, 0.06); }
.osd-bar { width: 100%; height: 0.45em; border-radius: 1em; background: rgba(255, 255, 255, 0.12); overflow: hidden; margin-top: 0.5em; }
.osd-bar i { display: block; height: 100%; background: var(--cyan); }
.osd-stepper { display: flex; align-items: center; gap: 0.6em; padding: 0.4em 0.9em; }
.osd-stepper button { width: 2.2em; height: 2.2em; border-radius: 50%; border: 1px solid #4a4f63; background: transparent; color: #fff; cursor: pointer; font-size: 1em; }
.osd-stepper output { font: 600 1.4em var(--mono); color: #fff; min-width: 2.4em; text-align: center; }
.osd-preview { position: absolute; inset: 0; pointer-events: none; mix-blend-mode: normal; transition: filter .3s; }
.osd-toast { position: absolute; right: 3%; bottom: 6%; font: 500 clamp(9px, 1.3cqi, 13px) var(--mono); padding: 0.5em 0.8em; border-radius: 8px; background: rgba(0, 0, 0, 0.7); color: var(--cyan); opacity: 0; transition: opacity .3s; }
.osd-toast.is-on { opacity: 1; }
.osd-help { padding: 18px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); min-height: 300px; }
.osd-help .crumb { font: 500 11px var(--mono); color: var(--ink-3); margin-bottom: 8px; }
.osd-help h4 { font-size: 22px; }
.osd-help .tip { padding: 10px 12px; border-radius: 10px; border-left: 2px solid var(--qd-green); background: rgba(59, 255, 138, 0.05); font-size: 14px; color: var(--ink-2); }
.osd-help .caveat { padding: 10px 12px; border-radius: 10px; border-left: 2px solid var(--amber); background: rgba(255, 176, 62, 0.05); font-size: 13px; color: var(--ink-2); margin-top: 10px; }
.osd-pad { display: grid; grid-template-columns: repeat(3, 44px); grid-template-rows: repeat(3, 44px); gap: 4px; justify-content: center; margin: 16px auto 0; }
.osd-pad button { border-radius: 10px; border: 1px solid var(--line-2); background: rgba(10, 14, 28, 0.8); color: var(--ink); cursor: pointer; font-size: 16px; }
.osd-pad button:hover { border-color: var(--cyan); box-shadow: var(--glow-cyan); }
.osd-pad .c { grid-column: 2; grid-row: 2; border-radius: 50%; }
.osd-pad .u { grid-column: 2; grid-row: 1; } .osd-pad .d { grid-column: 2; grid-row: 3; } .osd-pad .l { grid-column: 1; grid-row: 2; } .osd-pad .r { grid-column: 3; grid-row: 2; }
.osd-search { width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line-2); background: rgba(0, 0, 0, 0.4); color: var(--ink); font: 14px var(--font); }
.osd-results { display: grid; gap: 4px; margin-top: 8px; max-height: 220px; overflow: auto; }
.osd-results button { text-align: left; padding: 8px 10px; border-radius: 8px; border: 1px solid transparent; background: rgba(255, 255, 255, 0.03); color: var(--ink-2); cursor: pointer; font: 13px var(--font); }
.osd-results button:hover { border-color: var(--cyan); color: var(--ink); }
.osd-results small { display: block; color: var(--ink-3); font: 11px var(--mono); }
@media (max-width: 1000px) { .osd-wrap { grid-template-columns: 1fr; } }
@media (max-width: 640px) {
  .osd-screen { aspect-ratio: auto; min-height: 460px; }
  .osd-panel { left: 3%; right: 3%; width: auto; top: 3%; bottom: 3%; font-size: 13px; }
}

/* ---------- cards / grids ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.card { padding: 18px 20px; border-radius: var(--radius); border: 1px solid var(--line); background: rgba(8, 11, 22, 0.6); position: relative; overflow: hidden; }
.card::before { content: ''; position: absolute; inset: 0 0 auto; height: 1px; background: linear-gradient(90deg, transparent, var(--cyan), transparent); opacity: .4; }
.card h4 { margin-bottom: 8px; }
.card p, .card li { font-size: 14.5px; color: var(--ink-2); }
.card ul { padding-left: 1.1em; margin: 0; }
.card .num { font: 600 clamp(26px, 3vw, 38px) var(--mono); color: var(--ink); text-shadow: var(--glow-cyan); line-height: 1.1; }
.card .num small { font-size: .45em; color: var(--ink-3); }
.card .src { display: block; margin-top: 10px; font: 11px var(--mono); color: var(--ink-3); }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.spec-table th { width: 38%; font: 500 12px var(--mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .04em; }
.spec-table td { color: var(--ink); }
.spec-table td .conf { margin-left: 6px; }
.conf { font: 600 9.5px var(--mono); padding: 2px 6px; border-radius: 999px; letter-spacing: .06em; vertical-align: 1px; white-space: nowrap; }
.conf.c-spec { color: var(--qd-green); border: 1px solid rgba(59, 255, 138, 0.4); }
.conf.c-meas { color: var(--cyan); border: 1px solid rgba(62, 242, 255, 0.4); }
.conf.c-unc { color: var(--amber); border: 1px solid rgba(255, 176, 62, 0.45); }

/* ---------- gaming presets ---------- */
.preset-tabs { margin-bottom: 14px; }
.preset-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
@media (max-width: 800px) { .preset-body { grid-template-columns: 1fr; } }
.lag-bars { display: grid; gap: 10px; }
.lag-bar { display: grid; grid-template-columns: 90px 1fr 76px; gap: 10px; align-items: center; font: 12px var(--mono); color: var(--ink-2); }
.lag-bar .track { height: 10px; border-radius: 6px; background: rgba(255, 255, 255, 0.06); overflow: hidden; }
.lag-bar .track i { display: block; height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--cyan), var(--magenta)); box-shadow: var(--glow-cyan); transition: width .8s cubic-bezier(.2, .8, .2, 1); }

/* ---------- sources ---------- */
.sources { columns: 2 320px; column-gap: 28px; font-size: 14px; }
.sources li { break-inside: avoid; margin-bottom: 10px; color: var(--ink-2); }
.sources .t { font: 10px var(--mono); color: var(--magenta); letter-spacing: .08em; text-transform: uppercase; margin-right: 6px; }
footer { padding: 40px var(--gutter) 120px; max-width: var(--maxw); margin: 0 auto; color: var(--ink-3); font-size: 13px; border-top: 1px solid var(--line); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .8, .2, 1); }
.reveal.is-in { opacity: 1; transform: none; }

/* light cone behind hero */
.beam { position: absolute; inset: -20% -10% auto; height: 120%; pointer-events: none; background: conic-gradient(from 180deg at 50% 0%, transparent 42%, rgba(62, 242, 255, 0.06) 48%, rgba(255, 62, 165, 0.05) 52%, transparent 58%); filter: blur(10px); z-index: -1; }

/* section cue ribbons */
.cue { display: inline-flex; align-items: center; gap: 8px; font: 500 12px var(--mono); color: var(--ink-3); margin-top: 8px; }
.cue kbd { font-size: 11px; }