/* phunction.sh — the design system.
   One rule generates everything: COLOR IS PHASE. The site is a domain-colored
   complex plane; accents are the cube roots of unity on the OKLCH hue wheel
   (ω⁰ amber, ω¹ cyan, ω² magenta), gradients are arcs of that wheel, and the
   typography stages the project's central tension: the paper (Computer
   Modern — mathematics) against the shell (Iosevka — the terminal).
   Canon: docs/aesthetic.md. Everything legible on a 1080p screenshare. */

/* ---- faces ---- */
@font-face {
  font-family: "Paper";
  src: url("/fonts/KaTeX_Main-Regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Paper";
  src: url("/fonts/KaTeX_Main-Bold.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Paper";
  src: url("/fonts/KaTeX_Main-Italic.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "PaperMath";
  src: url("/fonts/KaTeX_Math-Italic.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "Iosevka";
  src: url("/fonts/iosevka-latin-400-normal.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Iosevka";
  src: url("/fonts/iosevka-latin-400-italic.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "Iosevka";
  src: url("/fonts/iosevka-latin-700-normal.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}

/* ---- tokens ---- */
:root {
  /* the plane */
  --plane: #0a0812;                       /* violet-black: |z| → ∞ */
  --surface: #131020;
  --gridline: oklch(85% 0.03 300 / 0.07);
  --line: oklch(85% 0.03 300 / 0.18);
  /* ink */
  --ink: #ece5d8;                          /* chalk-warm paper white */
  --annot: #8f8878;                        /* marginalia */
  /* phase wheel — color = arg(z); accents are the cube roots of unity */
  --w0: oklch(80% 0.15 85);                /* ω⁰ amber   */
  --w1: oklch(78% 0.12 215);               /* ω¹ cyan    */
  --w2: oklch(72% 0.19 345);               /* ω² magenta */
  --w0-dim: oklch(80% 0.15 85 / 0.35);
  --w1-dim: oklch(78% 0.12 215 / 0.35);
  --w2-dim: oklch(72% 0.19 345 / 0.35);
  /* type roles */
  --paper: "Paper", "STIX Two Text", Georgia, serif;
  --math: "PaperMath", "Paper", Georgia, serif;
  --term: "Iosevka", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    linear-gradient(var(--gridline) 1px, transparent 1px) 0 0 / 100% 2.4rem,
    linear-gradient(90deg, var(--gridline) 1px, transparent 1px) 0 0 / 2.4rem 100%,
    var(--plane);
  color: var(--ink);
  font-family: var(--term);
  font-size: 15px;
  line-height: 1.55;
}

a { color: var(--w1); text-decoration: none; }
a:hover { color: var(--w2); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* ---- chrome ---- */
.topbar {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 0.8rem 1.4rem;
  border-bottom: 1px solid var(--line);
}
.brand { color: var(--ink); font-weight: 700; }
.brand::before { content: "~/"; color: var(--annot); font-weight: 400; }
.brand:hover { color: var(--w0); }
.links { display: flex; gap: 1.4rem; }

/* ---- landing ---- */
.hero {
  max-width: 64rem; margin: 0 auto; padding: 2.5rem 1.5rem 4rem;
}
.wordmark {
  font-family: var(--paper); font-style: italic; font-weight: 400;
  font-size: clamp(3rem, 9vw, 5.5rem);
  letter-spacing: 0.01em;
  margin: 1.2rem 0 0.4rem;
  color: var(--ink);
}
.theorem {
  font-family: var(--paper);
  font-size: 1.2rem;
  max-width: 42rem;
  margin: 0 0 3rem;
}
.theorem .thm-label { font-weight: 700; }
.theorem em { font-style: italic; }
.theorem .qed { color: var(--w0); }

/* the signature: a live phasor tracing its projection */
.phasor-fig { margin: 1.5rem 0 0; }
.phasor-fig svg { width: 100%; height: auto; display: block; }
.phasor-fig .axis { stroke: var(--line); stroke-width: 1; }
.phasor-fig .unit { fill: none; stroke: var(--line); stroke-width: 1.5; }
.phasor-fig .radius {
  stroke: oklch(78% 0.16 var(--phase, 85)); stroke-width: 2.5;
  stroke-linecap: round;
}
.phasor-fig .tip { fill: oklch(82% 0.17 var(--phase, 85)); }
.phasor-fig .projection {
  stroke: var(--line); stroke-width: 1; stroke-dasharray: 3 5;
}
.phasor-fig .trace {
  fill: none; stroke: oklch(76% 0.15 var(--phase, 85));
  stroke-width: 2; stroke-linecap: round;
}
.figcaption, .phasor-fig figcaption {
  font-family: var(--term); font-size: 0.8rem; color: var(--annot);
  margin-top: 0.4rem;
}

/* exhibits */
.figs {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1.2rem; margin: 0 0 3rem;
}
.fig {
  --w: var(--w1); --w-dim: var(--w1-dim);
  display: block;
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  padding: 1.1rem 1.2rem 1.3rem;
  color: var(--ink);
  transition: border-color 0.15s, transform 0.15s;
}
.fig:hover { border-color: var(--w); transform: translateY(-2px); color: var(--ink); }
.fig.hot { --w: var(--w2); --w-dim: var(--w2-dim); }
.fig.warm { --w: var(--w0); --w-dim: var(--w0-dim); }
.fig .fig-label { font-size: 0.8rem; color: var(--annot); display: block; }
.fig .fig-name {
  font-family: var(--paper); font-style: italic; font-size: 1.5rem;
  color: var(--w); display: block; margin: 0.15rem 0 0.35rem;
}
.fig .fig-glyph { float: right; font-size: 1.6rem; color: var(--w-dim); }
.fig .fig-desc { color: var(--annot); font-size: 0.9rem; display: block; }

.colophon {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  color: var(--annot); font-size: 0.8rem;
}

/* ---- phazor panel ---- */
.panel { max-width: 62rem; margin: 0 auto; padding: 2rem 1.5rem; }
.panel-head h1 {
  font-family: var(--paper); font-style: italic; font-weight: 400;
  font-size: 2.6rem; margin: 0;
}
.panel-head .sub { color: var(--annot); font-size: 0.85rem; }

.power {
  display: block; margin: 4rem auto;
  padding: 1.1rem 2.4rem;
  font-family: var(--term); font-size: 1.2rem;
  color: var(--plane); background: var(--w0);
  border: none; cursor: pointer;
}
.power:hover { background: var(--w2); }

.transport { display: flex; gap: 0.8rem; align-items: center; margin: 1.6rem 0; flex-wrap: wrap; }
.xport {
  font-family: var(--term); font-size: inherit;
  padding: 0.45rem 1.1rem; cursor: pointer;
  color: var(--ink); background: var(--surface);
  border: 1px solid var(--line);
}
.xport:hover { border-color: var(--ink); }
.xport.lit { color: var(--plane); background: var(--w0); border-color: var(--w0); }
.xport.panic { border-color: var(--w2-dim); color: var(--w2); }
.tempo { margin-left: auto; display: flex; gap: 0.6rem; align-items: center; color: var(--annot); }
.tempo .val { color: var(--w0); min-width: 3ch; }

/* the step row is the unit circle unrolled: step i sounds at phase
   2πi/16, and wears that hue when armed. --i is set inline per button. */
.steps {
  display: grid; grid-template-columns: repeat(16, 1fr); gap: 0.35rem;
  margin: 1.4rem 0;
}
.step {
  aspect-ratio: 1 / 1.4; cursor: pointer; position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  color: transparent;
  font-family: var(--term);
}
.step:nth-child(4n + 1) { border-color: color-mix(in oklab, var(--line) 40%, var(--ink)); }
.step:hover { border-color: var(--ink); }
.step.on {
  background: oklch(74% 0.15 calc(85deg + var(--i) * 22.5deg));
  border-color: transparent;
  color: var(--plane);
}
.step.on .note { font-size: 0.7rem; }
.step.now { outline: 2px solid var(--ink); outline-offset: 1px; }

.knobs { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 1rem; margin: 1.6rem 0; }
.param { display: grid; grid-template-columns: 6.5rem 1fr 5.5rem; gap: 0.6rem; align-items: center; }
.param .name { color: var(--annot); }
.param .val { color: var(--w0); font-size: 0.85rem; text-align: right; font-variant-numeric: tabular-nums; }

input[type="range"] { accent-color: var(--w2); width: 100%; }

.readout { display: flex; gap: 1.4rem; align-items: center; margin-top: 1.8rem; flex-wrap: wrap; }
.meter { display: flex; gap: 0.5rem; align-items: center; flex: 1; min-width: 14rem; }
.meter .ch { color: var(--annot); }
.meter .bar {
  position: relative; flex: 1; height: 0.7rem;
  background: var(--surface); border: 1px solid var(--line);
  overflow: hidden;
}
.meter .rms {
  position: absolute; inset: 0 auto 0 0;
  background: linear-gradient(90deg in oklch longer hue, var(--w1), var(--w0));
}
.meter .peak { position: absolute; top: 0; bottom: 0; width: 2px; background: var(--w2); }
.stats { display: flex; gap: 1.2rem; color: var(--annot); font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.stats .warn { color: var(--w2); }

/* ---- lab ---- */
.lab-head {
  max-width: 64rem; margin: 0 auto; padding: 2.5rem 1.5rem 0;
}
.lab-head h1 {
  font-family: var(--paper); font-style: italic; font-weight: 400;
  font-size: 2.6rem; margin: 0 0 0.2rem;
}
.lab-head .tagline { color: var(--annot); margin: 0 0 2rem; }
.lab-figs { max-width: 64rem; margin: 0 auto; padding: 0 1.5rem 4rem; }

.labview { position: fixed; inset: 0; background: #000; }
.labcanvas { width: 100%; height: 100%; display: block; touch-action: none; }
.labhud {
  position: absolute; left: 0.9rem; bottom: 0.7rem;
  display: flex; gap: 1.2rem; align-items: baseline;
  color: var(--annot); font-size: 0.8rem;
  text-shadow: 0 0 6px #000;
}
.labhud .hint { opacity: 0.7; }
.gfx-error {
  position: absolute; top: 40%; width: 100%; text-align: center;
  color: var(--w2); z-index: 2;
}

/* ---- 404 ---- */
.nothing { text-align: center; padding: 6rem 1.5rem; }
.nothing h1 { font-family: var(--math); font-size: 5rem; margin: 0; color: var(--w2); }
.nothing p { color: var(--annot); }

/* ---- debug HUD (ships to production, on purpose) ---- */
.hud {
  position: fixed; right: 0.8rem; bottom: 0.8rem; z-index: 99;
  width: min(38rem, calc(100vw - 2rem)); max-height: 45vh;
  display: flex; flex-direction: column;
  background: color-mix(in oklab, var(--plane) 94%, transparent);
  border: 1px solid var(--w1-dim);
  font-size: 0.75rem;
}
.hud header { display: flex; justify-content: space-between; padding: 0.4rem 0.7rem; border-bottom: 1px solid var(--line); color: var(--w1); }
.hud .hud-build { color: var(--w0); }
.hud .hud-log { flex: 1; overflow: auto; margin: 0; padding: 0.5rem 0.7rem; color: var(--ink); white-space: pre-wrap; }
.hud footer { padding: 0.3rem 0.7rem; color: var(--annot); border-top: 1px solid var(--line); }

@media (prefers-reduced-motion: reduce) {
  .fig, .fig:hover { transition: none; transform: none; }
}