/* γ Lab — dark scientific UI on the site's NeonFlux tokens.
   Rest energy is cyan, kinetic energy is magenta, γ and totals are lime, and
   warnings are amber. Nothing is ever encoded in colour alone. */

:root {
  --color-lime-300: #5cffa6;
  --color-lime-400: #1fff8f;
  --color-lime-500: #15d473;
  --color-magenta-300: #d98aff;
  --color-magenta-400: #c64fff;
  --color-cyan-300: #7ee8ff;
  --color-cyan-400: #35d6ff;
  --color-amber-300: #ffd27a;
  --color-amber-400: #ffb43d;

  --color-ink-0: #050505;
  --color-ink-900: #0a0a0a;
  --color-ink-800: #121212;
  --color-ink-700: #1c1c1c;
  --color-ink-600: #2a2a2a;
  --color-ink-500: #3d3d3d;
  --color-ink-300: #8a8a8a;
  --color-ink-200: #b6b6b6;
  --color-ink-50: #f5f5f5;

  --bg-canvas: var(--color-ink-0);
  --bg-surface: var(--color-ink-800);
  --bg-raised: var(--color-ink-700);
  --fg-default: var(--color-ink-50);
  --fg-muted: var(--color-ink-300);
  --accent-default: var(--color-lime-400);
  --border-default: var(--color-ink-700);
  --border-strong: var(--color-ink-500);

  --font-display: "Space Mono", ui-monospace, monospace;
  --font-body: "DM Sans", system-ui, sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, monospace;

  --radius-sm: 2px;
  --radius-md: 4px;

  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg-canvas);
  color: var(--fg-default);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 56px; /* room for the equation strip */
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.scanlines {
  position: fixed; inset: 0; pointer-events: none; z-index: 50;
  background: repeating-linear-gradient(to bottom, rgba(0,0,0,0.35) 0px, rgba(0,0,0,0.35) 1px, transparent 1px, transparent 3px);
  opacity: 0.3; mix-blend-mode: overlay;
}

.backdrop {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    radial-gradient(ellipse 900px 600px at 10% -10%, rgba(31,255,143,0.09), transparent 60%),
    radial-gradient(ellipse 800px 700px at 100% 110%, rgba(198,79,255,0.08), transparent 60%),
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: auto, auto, 42px 42px, 42px 42px;
  mask-image: radial-gradient(ellipse 1300px 900px at 50% 0%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 1300px 900px at 50% 0%, #000 0%, transparent 78%);
}

.wrap { position: relative; z-index: 1; max-width: 1240px; margin: 0 auto; padding: 0 18px 60px; }

:focus-visible { outline: 2px solid var(--accent-default); outline-offset: 2px; border-radius: var(--radius-sm); }

/* ---------- header ---------- */

.top { padding: 16px 0 6px; }

.back-link {
  display: inline-block; font-family: var(--font-data); font-size: 0.72rem;
  letter-spacing: 0.06em; color: var(--fg-muted); text-decoration: none; margin-bottom: 10px;
}
.back-link:hover { color: var(--accent-default); }

.eyebrow {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-data); font-size: 0.68rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--color-magenta-300); margin: 0 0 6px;
}
.eyebrow::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-magenta-400); box-shadow: 0 0 8px 1px rgba(198,79,255,0.8);
}

h1 {
  font-family: var(--font-display); text-transform: uppercase; letter-spacing: 0.02em;
  font-size: clamp(1.3rem, 5vw, 1.75rem); margin: 0 0 6px; color: var(--accent-default);
  text-shadow: 0 0 4px rgba(31,255,143,0.7), 0 0 18px rgba(31,255,143,0.35);
}
h1 .glyph { text-transform: none; }
.h1-sub {
  display: block; font-size: 0.62em; letter-spacing: 0.06em;
  color: var(--color-ink-200); text-shadow: none; margin-top: 4px;
}

.thesis {
  font-family: var(--font-display); font-size: clamp(0.95rem, 2.4vw, 1.1rem);
  color: var(--color-cyan-300); margin: 10px 0 8px; line-height: 1.4;
  border-left: 2px solid var(--color-cyan-400); padding-left: 12px;
}

.sub { color: var(--fg-muted); font-size: 0.88rem; margin: 0 0 14px; max-width: 78ch; }

.myth-pin {
  background: rgba(198,79,255,0.08); border: 1px solid rgba(198,79,255,0.35);
  border-radius: var(--radius-md); padding: 10px 14px; font-size: 0.84rem;
  color: var(--color-ink-200); margin: 0 0 18px;
}
.myth-pin strong { color: var(--color-magenta-300); }

/* ---------- layout ---------- */

.lab { display: grid; grid-template-columns: 306px minmax(0, 1fr); gap: 18px; align-items: start; }

.controls { position: sticky; top: 12px; display: grid; gap: 14px; }

.ctl-group {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-md); padding: 12px 13px 14px;
}
.ctl-group h2 {
  font-family: var(--font-data); font-size: 0.66rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--color-lime-300); margin: 0 0 10px;
}

.ctl-label {
  display: block; font-family: var(--font-data); font-size: 0.72rem;
  color: var(--fg-default); margin: 12px 0 6px; letter-spacing: 0.04em;
}
.ctl-group h2 + .ctl-label { margin-top: 0; }

.ctl-note { font-size: 0.72rem; color: var(--fg-muted); margin: 6px 0 0; line-height: 1.45; }
.ctl-note.warn { color: var(--color-amber-300); }

/* sliders */
.slider {
  -webkit-appearance: none; appearance: none; width: 100%; height: 26px;
  background: transparent; cursor: pointer; margin: 0;
}
.slider::-webkit-slider-runnable-track {
  height: 6px; border-radius: 3px;
  background: linear-gradient(90deg, var(--color-cyan-400), var(--color-magenta-400) 62%, var(--color-lime-400));
}
.slider::-moz-range-track {
  height: 6px; border-radius: 3px;
  background: linear-gradient(90deg, var(--color-cyan-400), var(--color-magenta-400) 62%, var(--color-lime-400));
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 18px; height: 18px; margin-top: -6px;
  border-radius: 50%; background: var(--color-ink-50); border: 2px solid var(--color-ink-0);
  box-shadow: 0 0 8px rgba(31,255,143,0.6);
}
.slider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--color-ink-50);
  border: 2px solid var(--color-ink-0); box-shadow: 0 0 8px rgba(31,255,143,0.6);
}

/* number inputs */
.beta-row, .unit-row { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
input[type="number"] {
  flex: 1 1 auto; min-width: 0; background: var(--color-ink-900); color: var(--fg-default);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  font-family: var(--font-data); font-size: 0.8rem; padding: 6px 8px;
}
.unit { font-family: var(--font-data); font-size: 0.75rem; color: var(--fg-muted); }
.beta-pct { font-family: var(--font-data); font-size: 0.7rem; color: var(--color-cyan-300); text-align: right; }

select {
  width: 100%; margin-top: 8px; background: var(--color-ink-900); color: var(--fg-default);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  font-family: var(--font-data); font-size: 0.75rem; padding: 6px 8px;
}

/* chip + segmented buttons */
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chip-row button, .seg button, .ghost-btn {
  font-family: var(--font-data); font-size: 0.72rem; letter-spacing: 0.03em;
  background: var(--bg-raised); color: var(--color-ink-200);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 6px 9px; cursor: pointer; transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.chip-row button:hover, .seg button:hover, .ghost-btn:hover { color: var(--fg-default); border-color: var(--accent-default); }
.chip-row button.wide { flex: 1 1 46%; }
.seg { display: flex; gap: 6px; margin-top: 8px; }
.seg button { flex: 1 1 0; }
.seg button.is-on, .chip-row button.is-on {
  background: rgba(31,255,143,0.16); color: var(--color-lime-300); border-color: var(--color-lime-500);
}

.preset-grid { display: grid; gap: 6px; }
.preset-btn {
  display: flex; justify-content: space-between; align-items: baseline; gap: 8px; text-align: left;
  background: var(--bg-raised); border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 7px 9px; cursor: pointer; color: var(--color-ink-200); font-family: var(--font-body); font-size: 0.8rem;
}
.preset-btn:hover { border-color: var(--color-magenta-400); color: var(--fg-default); }
.preset-btn.is-on { background: rgba(198,79,255,0.14); border-color: var(--color-magenta-400); color: var(--color-magenta-300); }
.preset-btn .p-chip { font-family: var(--font-data); font-size: 0.68rem; color: var(--fg-muted); white-space: nowrap; }

/* ---------- stage ---------- */

.stage-col { display: grid; gap: 14px; min-width: 0; }

.stage-panel {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-md); padding: 8px 8px 6px; overflow: hidden;
}
#stage-canvas { display: block; width: 100%; height: 300px; border-radius: var(--radius-sm); }
.stage-caption { font-size: 0.72rem; color: var(--fg-muted); margin: 6px 4px 2px; }

.preset-note {
  background: rgba(53,214,255,0.07); border: 1px solid rgba(53,214,255,0.3);
  border-left-width: 3px; border-radius: var(--radius-md);
  padding: 10px 13px; font-size: 0.82rem; color: var(--color-ink-200); margin: 0;
}

/* ---------- tabs ---------- */

.tabs { display: flex; flex-wrap: wrap; gap: 6px; }
.tabs button {
  font-family: var(--font-data); font-size: 0.74rem; letter-spacing: 0.04em;
  background: transparent; color: var(--fg-muted);
  border: 1px solid var(--border-default); border-bottom-width: 2px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0; padding: 8px 12px; cursor: pointer;
}
.tabs button:hover { color: var(--fg-default); }
.tabs button.is-on {
  color: var(--color-lime-300); border-color: var(--border-default);
  border-bottom-color: var(--accent-default); background: rgba(31,255,143,0.07);
}

/* ---------- panels ---------- */

.panel[hidden] { display: none; }
.panel-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 14px; }

.card {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-md); padding: 12px 14px 14px; min-width: 0;
}
.card h3 {
  font-family: var(--font-data); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-cyan-300); margin: 0 0 10px;
}

.card canvas { display: block; width: 100%; }
.c-bars, .c-clocks { height: 190px; }
.c-light { height: 340px; }
.c-muon { height: 360px; }
.c-limit { height: 400px; }
.c-twin { height: 260px; }

.row-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 10px; }
.row-controls .ctl-label { margin: 0; }
.ctl-inline { display: flex; align-items: center; gap: 10px; flex: 1 1 260px; }
.ctl-inline .slider { flex: 1 1 auto; }
.ctl-inline output { font-family: var(--font-data); font-size: 0.78rem; color: var(--color-lime-300); min-width: 52px; }

.mode-flag { font-family: var(--font-data); font-size: 0.7rem; padding: 3px 8px; border-radius: var(--radius-sm); }
.mode-flag.is-on { color: var(--color-lime-300); background: rgba(31,255,143,0.12); }
.mode-flag.is-off { color: var(--color-amber-300); background: rgba(255,180,61,0.12); }

.readout-list { display: grid; grid-template-columns: 1fr; gap: 2px; margin: 12px 0 0; }
.readout-list.wide { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 2px 18px; }
.readout-list > div {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  padding: 5px 0; border-bottom: 1px dashed var(--color-ink-700);
}
.readout-list dt { font-size: 0.78rem; color: var(--fg-muted); display: flex; align-items: center; gap: 6px; }
.readout-list dd { margin: 0; font-family: var(--font-data); font-size: 0.82rem; text-align: right; }

.swatch { width: 9px; height: 9px; border-radius: 2px; display: inline-block; }
.s-rest { background: var(--color-cyan-400); }
.s-kin { background: var(--color-magenta-400); }
.s-tot { background: transparent; border: 1.5px solid var(--color-lime-400); }

.caption {
  margin: 12px 0 0; font-size: 0.85rem; color: var(--color-ink-200);
  border-top: 1px solid var(--border-default); padding-top: 10px;
}
.caption strong { color: var(--color-lime-300); font-family: var(--font-data); }

.disclaimer { font-size: 0.74rem; color: var(--fg-muted); margin: 10px 0 0; }
.myth {
  font-size: 0.8rem; color: var(--color-ink-200); background: rgba(198,79,255,0.07);
  border: 1px solid rgba(198,79,255,0.3); border-radius: var(--radius-md); padding: 9px 12px; margin: 12px 0 0;
}
.myth strong { color: var(--color-magenta-300); }

/* inspector */
.inspector { width: 100%; border-collapse: collapse; font-size: 0.8rem; }
.inspector th, .inspector td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--color-ink-700); }
.inspector thead th {
  font-family: var(--font-data); font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--fg-muted);
}
.inspector tbody th { font-family: var(--font-data); color: var(--color-cyan-300); width: 4.5rem; }
.inspector td:last-child { font-family: var(--font-data); text-align: right; }
.inspector td.is-hero { color: var(--color-lime-300); font-weight: 700; }

.derivation { margin: 0; padding-left: 18px; font-size: 0.85rem; color: var(--color-ink-200); }
.derivation li { margin-bottom: 8px; }
.derivation strong { color: var(--fg-default); }

.formula-block { display: grid; gap: 6px; margin: 12px 0 0; }
.formula-block code {
  font-family: var(--font-data); font-size: 0.82rem; color: var(--color-lime-300);
  background: var(--color-ink-900); border: 1px solid var(--border-default);
  border-radius: var(--radius-sm); padding: 8px 10px; overflow-x: auto;
}

/* ---------- tooltips ---------- */

.hint {
  display: inline-flex; align-items: center; justify-content: center;
  width: 15px; height: 15px; border-radius: 50%; font-size: 0.62rem; cursor: help;
  border: 1px solid var(--border-strong); color: var(--fg-muted); position: relative;
  font-family: var(--font-data);
}
.hint:hover, .hint:focus-visible { color: var(--color-cyan-300); border-color: var(--color-cyan-400); }
.hint::after {
  content: attr(data-tip);
  position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%);
  width: 250px; padding: 8px 10px; font-family: var(--font-body); font-size: 0.74rem; line-height: 1.45;
  color: var(--fg-default); background: var(--color-ink-900);
  border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  opacity: 0; pointer-events: none; transition: opacity 0.12s; z-index: 20; text-align: left;
  box-shadow: 0 6px 20px rgba(0,0,0,0.6);
}
.hint:hover::after, .hint:focus-visible::after { opacity: 1; }

/* ---------- equation strip ---------- */

.eq-strip {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 26px;
  padding: 9px 18px; background: rgba(8,8,10,0.95);
  border-top: 1px solid var(--color-lime-500);
  font-family: var(--font-data); font-size: 0.78rem;
  backdrop-filter: blur(6px);
}
.eq { color: var(--fg-muted); white-space: nowrap; }
.eq b { color: var(--color-lime-300); font-weight: 700; }
.eq output { color: var(--fg-default); }
.eq-mode {
  margin-left: auto; font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-lime-300); border: 1px solid var(--color-lime-500);
  border-radius: var(--radius-sm); padding: 2px 8px;
}
.eq-mode.is-classic { color: var(--color-amber-300); border-color: var(--color-amber-400); }

.foot { font-size: 0.76rem; color: var(--fg-muted); margin: 22px 0 0; max-width: 80ch; }

/* ---------- responsive ---------- */

@media (max-width: 1000px) {
  .lab { grid-template-columns: 1fr; }
  /* Stacked, the ship and γ come first — they are the point of the page. */
  .stage-col { order: -1; }
  .controls { position: static; display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
}

@media (max-width: 620px) {
  body { font-size: 15px; padding-bottom: 76px; }
  .wrap { padding: 0 12px 40px; }
  #stage-canvas { height: 220px; }
  .c-light { height: 300px; }
  .c-muon { height: 320px; }
  .c-limit { height: 440px; }
  .tabs button { flex: 1 1 45%; }
  .readout-list dt { font-size: 0.74rem; }
  .hint::after { width: 200px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}