/* ==========================================================================
   AMOS LEE — LAB / 001
   assets/style.css — design system, shared chrome, page-level layout.
   Hand-written. No frameworks, no external requests, system fonts only.
   ========================================================================== */

/* ---------- 1. Tokens --------------------------------------------------- */

:root {
  --ink: #05070a;        /* page background, near-black with a blue cast */
  --ink-2: #0a0e14;      /* raised surfaces / cards */
  --ink-3: #111823;      /* hairlines-on-dark, input wells */
  --paper: #eef2f6;      /* primary text */
  --dim: #8b95a7;        /* secondary text, labels */
  --faint: #5a6474;      /* tertiary, disabled */
  --cyan: #4fe3d0;       /* primary accent (interactive, active nav) */
  --violet: #8b7cff;     /* secondary accent (links, chapter 2) */
  --amber: #ffb45a;      /* tertiary accent (warnings, chapter 3) */
  --line: rgba(238, 242, 246, .10);
  --line-2: rgba(238, 242, 246, .22);
  --glow: rgba(79, 227, 208, .18);

  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Songti TC", "Noto Serif TC", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang HK", "Microsoft JhengHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --head-h: 64px;
}

/* ---------- 2. Reset / base --------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--paper);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, canvas, svg, video {
  display: block;
  max-width: 100%;
}

a {
  color: var(--violet);
  text-decoration: none;
}

a:hover { text-decoration: underline; text-underline-offset: 3px; }

p { margin: 0 0 1.1em; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

::selection {
  background: var(--cyan);
  color: #04120f;
}

:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}

/* Custom scrollbar (webkit) */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--ink); }
::-webkit-scrollbar-thumb { background: var(--ink-3); border-radius: 0; }
::-webkit-scrollbar-thumb:hover { background: var(--faint); }

/* ---------- 3. Typography ------------------------------------------------ */

h1, h2, .display {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: .98;
  letter-spacing: -.02em;
  margin: 0 0 .6em;
  color: var(--paper);
}

h1 { font-size: clamp(2.6rem, 7vw, 5.4rem); }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.8rem); }

h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 .5em;
}

h4 {
  font-family: var(--font-mono);
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--dim);
  font-weight: 400;
  margin: 0 0 .8em;
}

.mono {
  font-family: var(--font-mono);
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

.mono.cyan { color: var(--cyan); }
.dim { color: var(--dim); }
.faint { color: var(--faint); }

.kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-bottom: 1.4rem;
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--dim);
  max-width: 56ch;
  line-height: 1.6;
}

.zh {
  display: block;
  font-family: var(--font-sans);
  font-size: clamp(.8rem, 1.4vw, 1rem);
  letter-spacing: .34em;
  color: var(--faint);
  margin-top: .9rem;
  font-weight: 400;
}

.prose {
  max-width: 62ch;
}

.prose p {
  color: var(--paper);
  opacity: .92;
}

.prose p + p { margin-top: 1.15em; }

blockquote.pull {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -.015em;
  color: var(--paper);
  margin: clamp(40px, 6vw, 72px) 0;
  padding-left: clamp(16px, 3vw, 32px);
  border-left: 1px solid var(--cyan);
  max-width: 22em;
}

blockquote.pull p { margin: 0; }

/* ---------- 4. Layout ---------------------------------------------------- */

.wrap {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 56px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(16px, 2vw, 28px);
}

section {
  padding-block: clamp(56px, 9vw, 120px);
  position: relative;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.hairline { border-top: 1px solid var(--line); }

/* Faint 1px grid overlay for section backgrounds (~4% opacity) */
.grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .04;
  background-image:
    linear-gradient(to right, var(--paper) 1px, transparent 1px),
    linear-gradient(to bottom, var(--paper) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 0;
}

.grid-overlay > *,
section > .wrap { position: relative; z-index: 1; }

/* ---------- 5. Fixed overlays -------------------------------------------- */

.noise {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  opacity: .03;
  mix-blend-mode: overlay;
  background-image: radial-gradient(circle at 1px 1px, var(--paper) .5px, transparent .5px);
  background-size: 3px 3px;
}

/* ---------- 6. Skip link --------------------------------------------------- */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04120f;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.skip:focus {
  left: 12px;
  top: 12px;
}

/* ---------- 7. Header ------------------------------------------------------ */

.site-head {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(5, 7, 10, .55);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: background .3s ease, border-color .3s ease;
}

.site-head.is-scrolled {
  background: rgba(5, 7, 10, .92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line-2);
}

.head-inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  min-height: var(--head-h);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--paper);
  text-decoration: none;
  flex: none;
}

.brand:hover { text-decoration: none; }

.brand-name {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .26em;
  text-transform: uppercase;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid var(--line-2);
  padding: 2px 6px;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  margin-left: auto;
  flex-wrap: wrap;
}

.nav a {
  position: relative;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  text-decoration: none;
  padding-block: 6px;
  transition: color .16s ease;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .25s cubic-bezier(.2, .7, .2, 1);
}

.nav a:hover { color: var(--paper); text-decoration: none; }
.nav a:hover::after { transform: scaleX(1); }

.nav a.is-active { color: var(--cyan); }
.nav a.is-active::after { transform: scaleX(1); }

.head-meta {
  flex: none;
  margin-left: clamp(8px, 2vw, 20px);
}

.head-meta #clock { white-space: nowrap; }

/* ---------- 8. Footer ------------------------------------------------------ */

.site-foot {
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  padding-block: clamp(40px, 6vw, 72px);
  margin-top: clamp(40px, 6vw, 80px);
}

.foot-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.foot-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.foot-col > a {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  text-decoration: none;
}

.foot-col > a:hover { color: var(--cyan); text-decoration: none; }

.foot-note {
  margin: 4px 0 0;
  color: var(--dim);
  font-size: .95rem;
  max-width: 30ch;
}

/* ---------- 9. Cards -------------------------------------------------------- */

.card {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.card:hover {
  border-color: var(--line-2);
  box-shadow: 0 0 0 1px var(--glow), 0 18px 48px -24px rgba(0, 0, 0, .8);
}

/* Chapter cards (index page) */

.chapters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 28px);
}

.chapter {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--paper);
  text-decoration: none;
  transition: border-color .2s ease, box-shadow .2s ease;
  min-height: 260px;
}

.chapter:hover {
  border-color: var(--line-2);
  box-shadow: 0 0 0 1px var(--glow), 0 18px 48px -24px rgba(0, 0, 0, .8);
  text-decoration: none;
}

.chapter .idx {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faint);
}

.chapter:nth-child(1) .idx { color: var(--cyan); }
.chapter:nth-child(2) .idx { color: var(--violet); }
.chapter:nth-child(3) .idx { color: var(--amber); }

.chapter .meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.chapter .arrow {
  font-family: var(--font-mono);
  color: var(--cyan);
  display: inline-block;
  transition: transform .22s cubic-bezier(.2, .7, .2, 1);
}

.chapter:hover .arrow { transform: translateX(8px); }

/* ---------- 10. Hero --------------------------------------------------------- */

.hero {
  padding-block: 0;
  min-height: 88vh;
  display: flex;
  align-items: center;
}

.hero-frame {
  position: relative;
  width: 100%;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink);
}

.hero-frame #field {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-frame .grid-overlay { z-index: 1; }

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-block: clamp(80px, 12vh, 140px);
}

.hero .lede { margin-top: 1.4rem; }

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(28px, 6vw, 80px);
  margin-top: clamp(36px, 6vw, 64px);
}

.stat { min-width: 140px; }

.stat .num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  line-height: 1;
  color: var(--paper);
  display: block;
  margin-block: 6px 2px;
  font-variant-numeric: tabular-nums;
}

.stat .unit {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faint);
}

.scroll-cue {
  position: absolute;
  right: clamp(16px, 4vw, 48px);
  bottom: clamp(16px, 4vh, 40px);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.scroll-cue .line {
  width: 1px;
  height: 56px;
  background: var(--line-2);
  position: relative;
  overflow: hidden;
}

.scroll-cue .line::after {
  content: "";
  position: absolute;
  left: 0;
  top: -40%;
  width: 100%;
  height: 40%;
  background: var(--cyan);
  animation: cue-drop 2.2s cubic-bezier(.4, 0, .4, 1) infinite;
}

@keyframes cue-drop {
  0%   { top: -40%; }
  70%  { top: 100%; }
  100% { top: 100%; }
}

/* ---------- 11. Corner brackets ---------------------------------------------- */

.brackets { position: relative; }

.brackets::before,
.brackets::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 0 solid var(--cyan);
  opacity: .45;
  pointer-events: none;
  z-index: 4;
}

.brackets::before {
  top: -1px;
  left: -1px;
  border-top-width: 1px;
  border-left-width: 1px;
}

.brackets::after {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 1px;
  border-right-width: 1px;
}

/* ---------- 12. Current strip -------------------------------------------------- */

.current-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 28px);
}

.current-cell {
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.current-cell p { margin: 0; color: var(--paper); opacity: .9; }

.current-cell a { color: var(--violet); }

.closing-line {
  padding-block: clamp(48px, 8vw, 96px);
}

.closing-line p {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  line-height: 1.25;
  letter-spacing: -.015em;
  color: var(--dim);
  max-width: 34ch;
  margin: 0;
}

/* ---------- 13. About page ------------------------------------------------------ */

.spec-sheet {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0 clamp(24px, 4vw, 56px);
  border-top: 1px solid var(--line);
  margin: clamp(32px, 5vw, 56px) 0;
  max-width: 62ch;
}

.spec-sheet dt {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  padding-block: 14px;
  border-bottom: 1px solid var(--line);
}

.spec-sheet dd {
  margin: 0;
  padding-block: 14px;
  border-bottom: 1px solid var(--line);
  color: var(--paper);
}

.read-list {
  list-style: none;
  counter-reset: steps;
  margin: 0;
  padding: 0;
  max-width: 62ch;
}

.read-list li {
  counter-increment: steps;
  position: relative;
  padding: 18px 0 18px 56px;
  border-top: 1px solid var(--line);
  color: var(--paper);
  opacity: .92;
}

.read-list li:last-child { border-bottom: 1px solid var(--line); }

.read-list li::before {
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--cyan);
}

/* ---------- 14. Interactive panels (JOB B contract) ------------------------------ */

.panel {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: clamp(20px, 3vw, 36px);
  margin-block: clamp(28px, 4vw, 48px);
}

.panel:hover {
  border-color: var(--line-2);
  box-shadow: 0 0 0 1px var(--glow), 0 18px 48px -24px rgba(0, 0, 0, .8);
}

.panel-grid {
  display: grid;
  grid-template-columns: minmax(260px, 5fr) minmax(300px, 7fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.panel canvas {
  width: 100%;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.panel canvas + canvas { margin-top: 14px; }

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 7px;
}

.control-row label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  flex: none;
}

.control-row .val {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--cyan);
  min-width: 4ch;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.readout {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  display: block;
  margin-block: 6px;
}

.readout strong,
.readout b {
  color: var(--paper);
  font-weight: 400;
}

.readout.warn { color: var(--amber); }

/* Range inputs */

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
  cursor: pointer;
  margin: 0;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--ink-3);
  border-radius: 0;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -5px;
  background: var(--cyan);
  border: 0;
  border-radius: 0;
  transition: box-shadow .16s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px var(--glow);
}

input[type="range"]::-moz-range-track {
  height: 2px;
  background: var(--ink-3);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--cyan);
  border: 0;
  border-radius: 0;
}

input[type="range"]:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}

/* Buttons */

button,
.btn {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line-2);
  border-radius: 2px;
  padding: 10px 18px;
  cursor: pointer;
  transition: background .16s ease, border-color .16s ease, color .16s ease;
}

button:hover,
.btn:hover {
  background: rgba(79, 227, 208, .12);
  border-color: var(--cyan);
}

button:disabled {
  color: var(--faint);
  border-color: var(--line);
  cursor: default;
  background: transparent;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block: 16px;
}

/* Chips (facts strip + note filters) */

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-block: clamp(24px, 4vw, 40px);
}

.chip {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  background: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 7px 12px;
  cursor: pointer;
  transition: color .16s ease, border-color .16s ease, background .16s ease;
}

button.chip:hover { color: var(--paper); border-color: var(--line-2); background: rgba(79, 227, 208, .12); }

.chip.is-active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(79, 227, 208, .12);
}

/* Swatch (spectra page) */

#swatch {
  min-height: 200px;
  border: 1px solid var(--line);
  border-radius: 2px;
  display: flex;
  align-items: flex-end;
  padding: 14px;
  margin-block: 14px;
}

#swatch .mono { color: rgba(5, 7, 10, .75); }

/* Notes */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-block: clamp(20px, 3vw, 32px);
}

.notes-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2vw, 28px);
}

.note {
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.note h2 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -.01em;
}

.note p { margin: 0; color: var(--paper); opacity: .9; }

.note .tags { margin-top: auto; }

.note .tags span {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faint);
  margin-right: 12px;
}

/* ---------- 15. Crosshair cursor ------------------------------------------------ */

.crosshair-dot,
.crosshair-ring {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 150;
  pointer-events: none;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  will-change: transform;
}

.crosshair-dot {
  width: 2px;
  height: 2px;
  background: var(--cyan);
}

.crosshair-ring {
  width: 24px;
  height: 24px;
  border: 1px solid rgba(79, 227, 208, .5);
}

.hero-frame { cursor: auto; }

/* Hide the native cursor over the hero only on precise pointers */
@media (pointer: fine) {
  .hero-frame { cursor: none; }
}

/* ---------- 16. Motion ----------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity .7s cubic-bezier(.2, .7, .2, 1),
    transform .7s cubic-bezier(.2, .7, .2, 1);
  transition-delay: calc(var(--i, 0) * 70ms);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 17. Reduced motion ---------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
  .crosshair-dot, .crosshair-ring { display: none; }
  .hero-frame { cursor: auto; }
}

/* ---------- 18. Responsive --------------------------------------------------------- */

@media (max-width: 980px) {
  .panel-grid { grid-template-columns: 1fr; }
  .chapters { grid-template-columns: 1fr 1fr; }
  .notes-list { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
  .chapters { grid-template-columns: 1fr; }
  .current-grid { grid-template-columns: 1fr; }
  .foot-inner { grid-template-columns: 1fr; }
  .head-inner { flex-wrap: wrap; padding-block: 10px; }
  .nav { order: 3; width: 100%; margin-left: 0; padding-bottom: 8px; }
  .head-meta { margin-left: auto; }
  .hero-stats { gap: 28px; }
  .spec-sheet { grid-template-columns: 1fr; }
  .spec-sheet dt { padding-bottom: 0; border-bottom: 0; }
  .spec-sheet dd { padding-top: 4px; }
}

/* ---------- 19. JOB B page support (appended) --------------------------------
   Added for acoustics / spectra / signals / notes. Append-only block; uses
   only the existing colour tokens. ------------------------------------------------ */

.plate {
  position: relative;
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.plate img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 2px;
}

.plate figcaption {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
}

.slider-row {
  display: grid;
  grid-template-columns: 7ch 1fr 5ch;
  align-items: center;
  gap: 12px;
  padding-block: 5px;
}

.slider-row > label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  white-space: nowrap;
}

.slider-row .val,
.control-row .val {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.chip.is-on {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(79, 227, 208, .12);
}

.fact {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  background: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 7px 12px;
}

.panel .canvas-stack canvas { height: auto; }

.note[hidden] { display: none; }

.standfirst {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--dim);
  max-width: 56ch;
  line-height: 1.6;
  margin-block: 0 clamp(8px, 2vw, 20px);
}

.page-head { padding-top: calc(var(--head-h) + clamp(40px, 8vw, 96px)); }

/* ============================================================================
   INTEGRATION PASS — orchestrator (ka309), appended after the JOB B block.
   Additive only: nothing above this line is modified.
   Contents: legibility step-up, display spacing, prose measure, instrument
   panel bezel + aligned faders, button hierarchy, image plates, portrait.
   ========================================================================== */

:root {
  --dim: #98a3b4;
  --faint: #6e7a8c;
}

/* 1. microtype one step up ------------------------------------------------- */
.mono,
.kicker,
.brand-tag,
.nav a,
.stat .unit,
.chapter .meta .mono,
.plate figcaption {
  font-size: .72rem;
  letter-spacing: .16em;
}

/* 2. display spacing & ragged-edge control --------------------------------- */
.hero .kicker { display: block; margin-bottom: clamp(16px, 2.2vw, 28px); }
.display .zh { margin-top: 1.1rem; }
h1, h2, h3, .display, .lede, .pull p, .closing-line p { text-wrap: balance; }
p { text-wrap: pretty; }

/* 3. prose measure — use the column --------------------------------------- */
.prose { max-width: 68ch; font-size: 1.02rem; line-height: 1.72; }
.prose p + p { margin-top: 1.1em; }
.readout { color: var(--dim); }

/* 4. instrument panel ----------------------------------------------------- */
.panel {
  background: linear-gradient(180deg, rgba(17, 24, 35, .88), rgba(10, 14, 20, .92));
}
.panel-grid { gap: clamp(24px, 3vw, 44px); }

.slider-row,
.control-row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 86px;
  align-items: center;
  gap: 14px;
}
.slider-row label,
.control-row label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--dim);
}
.slider-row .val,
.control-row .val {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--cyan);
  text-align: right;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.control-row {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* faders: hairline track, 3px cap — reads as a real control */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--line-2);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 3px;
  height: 15px;
  margin-top: -7px;
  background: var(--cyan);
  border-radius: 0;
  box-shadow: 0 0 10px var(--glow);
}
input[type="range"]::-moz-range-track { height: 1px; background: var(--line-2); }
input[type="range"]::-moz-range-thumb {
  width: 3px; height: 15px; border: 0; background: var(--cyan); border-radius: 0;
}

/* 5. button hierarchy: primary is the loud one ---------------------------- */
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
#playBtn {
  background: var(--cyan);
  color: #04120f;
  border: 1px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  padding: 11px 20px;
  cursor: pointer;
  transition: box-shadow .16s ease, background .16s ease;
}
#playBtn:hover { box-shadow: 0 0 0 1px var(--glow), 0 0 26px -6px var(--glow); }
#stopBtn {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  padding: 11px 20px;
  cursor: pointer;
}
#stopBtn:hover { border-color: var(--faint); }

/* 6. canvases sit in a bezel ---------------------------------------------- */
.canvas-stack canvas {
  width: 100%;
  background: rgba(5, 7, 10, .65);
  border: 1px solid var(--line);
}
#nyqOut { color: var(--cyan); letter-spacing: .1em; }

/* 7. image plates --------------------------------------------------------- */
.plate {
  margin: clamp(28px, 4vw, 52px) 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}
.plate img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.92) contrast(1.02);
}
.plate figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  color: var(--dim);
}

/* wide cinematic interlude band on the index */
.interlude { margin: clamp(40px, 6vw, 96px) 0 0; }
.interlude img {
  display: block;
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-block: 1px solid var(--line);
  opacity: .92;
}
.interlude figcaption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px clamp(20px, 5vw, 56px) 0;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

/* 8. about: real portrait, two columns on desktop ------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(220px, 320px) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}
.about-grid figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}
.about-grid figure img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.9) contrast(1.03);
}
.about-grid figure figcaption {
  padding: 9px 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--faint);
}

/* 9. crosshair must not paint before the first pointer move --------------- */
.crosshair-dot,
.crosshair-ring { opacity: 0; transition: opacity .25s ease; }

/* 10. small screens ------------------------------------------------------- */
@media (max-width: 760px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-grid figure { max-width: 320px; }
  .slider-row, .control-row { grid-template-columns: 54px minmax(0, 1fr) 74px; gap: 10px; }
  .interlude img { aspect-ratio: 16 / 9; }
  .prose { font-size: 1rem; }
}