/* Spin Clock — instruments on a bench. Layers: fonts, tokens, base, bar, band, instrument
   (controls + panel), worked steps, notes, shelf, charts, tables, footer, narrow. */

@font-face { font-family: "Space Grotesk"; src: url("fonts/space-grotesk.woff2") format("woff2"); font-weight: 300 700; font-display: swap; }
@font-face { font-family: "DM Mono"; src: url("fonts/dm-mono-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "DM Mono"; src: url("fonts/dm-mono-500.woff2") format("woff2"); font-weight: 500; font-display: swap; }

:root {
  --bench: #f2efe8;
  --card: #fbfaf6;
  --line: #d9d3c6;
  --ink: #23272b;
  --ink-soft: #565c62;
  --graphite: #23272b;
  --graphite-2: #2f3439;
  --amber: #f2a900;
  --amber-ink: #8a5a00;
  --dial: #cfc8b8;

  --grot: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --mono: "DM Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --gap: clamp(1rem, 0.6rem + 1.6vw, 2rem);
  --h1: clamp(2rem, 1.3rem + 3vw, 3.6rem);
  --h2: clamp(1.3rem, 1.1rem + 0.8vw, 1.7rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { overflow-wrap: break-word; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bench); color: var(--ink); font: 400 1.0625rem/1.6 var(--grot); }
h1, h2 { line-height: 1.12; margin: 0; letter-spacing: -0.015em; }
p, ul, ol, dl, figure { margin: 0; }
a { color: var(--amber-ink); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
@media (hover: hover) and (pointer: fine) { a:hover { color: var(--ink); text-decoration-thickness: 2px; } }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; box-shadow: 0 0 0 5px var(--graphite); border-radius: 3px; }
.skip { position: absolute; inset-inline-start: 1rem; inset-block-start: -3rem; background: var(--graphite); color: #fff; padding: 0.5rem 0.9rem; z-index: 5; }
.skip:focus { inset-block-start: 1rem; }
.kicker { font: 500 0.82rem/1.2 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--amber-ink); margin-block-end: 0.6rem; }

/* Bar */
.bar { background: var(--graphite); color: #f2efe8; }
.bar-inner { max-width: 78rem; margin-inline: auto; padding: 0.8rem var(--gap); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.6rem 2rem; }
.mark { display: flex; align-items: center; gap: 0.7rem; color: #f2efe8; text-decoration: none; }
.mark-icon { inline-size: 2.1rem; block-size: 2.1rem; flex: none; color: #f2efe8; }
.mark-name { display: block; font: 700 1.3rem/1.1 var(--grot); }
.mark-sub { display: block; font: 400 0.82rem/1.3 var(--mono); color: #c7c2b6; }
.tools ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.2rem 0.4rem; }
.tools a { display: inline-block; padding: 0.35rem 0.7rem; border-radius: 2rem; color: #f2efe8; text-decoration: none; font-weight: 500; font-size: 0.95rem; }
.tools a[aria-current="page"] { background: var(--amber); color: var(--graphite); }
@media (hover: hover) and (pointer: fine) { .tools a:not([aria-current]):hover { background: var(--graphite-2); color: #fff; } }
.menu { display: none; }
.menu summary { list-style: none; cursor: pointer; font: 500 0.9rem/1 var(--mono); padding: 0.65rem 0.9rem; border-radius: 2rem; background: var(--amber); color: var(--graphite); }
.menu summary::-webkit-details-marker { display: none; }
.menu summary::after { content: " +"; }
.menu[open] summary::after { content: " −"; }
.menu .tools ul { flex-direction: column; gap: 0.2rem; padding-block-start: 0.6rem; }
.menu .tools a { display: block; padding: 0.6rem 0.8rem; font-size: 1.05rem; }

/* Band */
.band-inner { max-width: 78rem; margin-inline: auto; padding: clamp(1.75rem, 1rem + 3vw, 3.25rem) var(--gap) 1.5rem; }
.band h1 { font-size: var(--h1); font-weight: 700; max-inline-size: 22ch; }
.lede { font-size: 1.15rem; color: var(--ink-soft); max-inline-size: 44rem; margin-block-start: 0.9rem; }
.sheet { max-width: 78rem; margin-inline: auto; padding: 0 var(--gap) 3rem; }

/* Instrument */
.instrument { display: flex; flex-wrap: wrap; gap: 1rem; align-items: stretch; }
.controls { min-inline-size: 0; flex: 1 1 18rem; max-inline-size: 26rem; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1.25rem; display: grid; gap: 1rem; align-content: start; }
.field label { display: block; font-weight: 600; font-size: 0.98rem; }
.input-row { display: flex; align-items: stretch; margin-block-start: 0.35rem; border: 1.5px solid var(--ink); border-radius: 8px; background: #fff; overflow: clip; }
.input-row input { flex: 1; inline-size: 0; min-inline-size: 0; border: 0; padding: 0.55rem 0.7rem; font: 500 1.15rem/1.2 var(--mono); color: var(--ink); background: transparent; }
.input-row input:focus-visible { outline: none; box-shadow: none; }
.input-row:focus-within { outline: 3px solid var(--ink); outline-offset: 2px; }
.input-row:has(input[aria-invalid="true"]) { border-color: #b3261e; border-width: 2.5px; }
.input-row input:disabled { color: var(--ink); opacity: 1; -webkit-text-fill-color: var(--ink); }
.unit { display: grid; place-items: center; padding-inline: 0.75rem; background: var(--bench); border-inline-start: 1px solid var(--line); font: 500 0.95rem/1 var(--mono); color: var(--ink-soft); }
.hint { display: block; font-size: 0.86rem; color: var(--ink-soft); margin-block-start: 0.3rem; }
.err { display: block; margin-block-start: 0.3rem; font-size: 0.9rem; font-weight: 600; color: #b3261e; }
.err::before { content: "⚠ "; }
.err[hidden] { display: none; }
.nowrap { white-space: nowrap; }
.nojs { font-size: 0.9rem; padding: 0.6rem 0.75rem; background: var(--bench); border-radius: 8px; }
.js-note { display: none; font-size: 0.86rem; color: var(--ink-soft); }
.controls.live .js-note { display: block; }

.panel { flex: 2 1 22rem; min-inline-size: 0; background: var(--graphite); color: #f2efe8; border-radius: 14px; padding: 1.4rem; display: flex; flex-wrap: wrap; gap: 1.25rem 2rem; align-items: center; justify-content: space-evenly; }
.reads { flex: 1 1 16rem; display: grid; gap: 0.9rem; }
.read dt { font: 400 0.88rem/1.3 var(--mono); color: #c7c2b6; }
.read dd { overflow-wrap: anywhere; margin: 0.15rem 0 0; font: 500 1.6rem/1.15 var(--mono); color: #fff; font-variant-numeric: tabular-nums; }
.read.big dd { font-size: clamp(2.1rem, 1.6rem + 2vw, 3rem); color: var(--amber); }
.invalid { flex-basis: 100%; color: var(--amber); font-weight: 600; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.clock-fig { flex: 0 1 13rem; margin-inline: auto; text-align: center; }
.clock-fig figcaption { font: 400 0.82rem/1.3 var(--mono); color: #c7c2b6; margin-block-start: 0.4rem; }
.clock { inline-size: 13rem; max-inline-size: 100%; block-size: auto; }
.clock .face { fill: var(--graphite-2); stroke: #3d4348; stroke-width: 2; }
.clock .tick { stroke: #8b8f93; stroke-width: 2; }
.clock .tick.major { stroke: #f2efe8; stroke-width: 3; }
.clock .arc { fill: none; stroke: var(--amber); stroke-width: 10; stroke-linecap: round; }
.clock .clock-n { font: 500 30px var(--mono); fill: #fff; }
.clock .clock-l { font: 400 15px var(--mono); fill: #c7c2b6; }

/* Worked steps and notes */
.worked { margin-block-start: 2.5rem; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1.25rem 1.4rem; max-inline-size: 52rem; }
.worked h2, .note h2, .shelf h2, .prose h2 { font-size: var(--h2); font-weight: 700; }
.worked ol { margin-block-start: 0.8rem; padding-inline-start: 1.5rem; display: grid; gap: 0.45rem; font-variant-numeric: tabular-nums; }
.worked li::marker { font: 500 0.95em var(--mono); color: var(--amber-ink); }
.note { margin-block-start: 2rem; max-inline-size: 44rem; }
.note > * + * { margin-block-start: 0.6rem; }

/* Shelf of instruments (index) */
.shelf { margin-block-start: 3rem; }
.shelf ol { list-style: none; padding: 0; margin-block-start: 1rem; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr)); gap: 0.9rem; }
.shelf a { display: grid; gap: 0.3rem; height: 100%; padding: 1rem 1.1rem; background: var(--card); border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: var(--ink); }
@media (hover: hover) and (pointer: fine) { .shelf a:hover { border-color: var(--ink); } }
.shelf-n { font: 500 0.82rem/1 var(--mono); color: var(--amber-ink); }
.shelf-t { font-weight: 700; font-size: 1.1rem; }
.shelf-d { font-size: 0.93rem; color: var(--ink-soft); }

/* Charts and tables */
.two { display: flex; flex-wrap: wrap; gap: 1.5rem 2.5rem; align-items: start; }
.two > * { flex: 1 1 22rem; min-inline-size: 0; }
.two.spaced { margin-block-start: 2rem; }
.fig { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1rem 1.1rem; }
.fig.wide { margin-block-start: 1.5rem; max-inline-size: 36rem; }
.fig figcaption { font-size: 0.9rem; color: var(--ink-soft); margin-block-start: 0.5rem; }
.chart { display: block; inline-size: 100%; block-size: auto; }
.chart .bar { fill: var(--graphite); }
.chart .bl { font: 500 20px var(--mono); fill: var(--ink); }
.chart .bv { font: 500 20px var(--mono); fill: var(--amber-ink); }
.chart .axis { stroke: var(--ink); stroke-width: 1.5; }
.chart .range { fill: var(--amber); opacity: 0.55; }
.chart .zero { stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 5 4; }
.chart .exp { fill: var(--graphite); stroke: #fff; stroke-width: 2; }
.tbl-wrap { position: relative; overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: 14px; }
.plain { border-collapse: collapse; inline-size: 100%; font-variant-numeric: tabular-nums; }
.plain th, .plain td { padding: 0.55rem 0.9rem; text-align: end; border-block-end: 1px solid var(--line); }
.plain thead th { font-size: 0.85rem; color: var(--ink-soft); vertical-align: bottom; }
.plain tbody th { text-align: start; font-family: var(--mono); font-weight: 500; }
.plain td { font-family: var(--mono); }
.cap { font-size: 0.88rem; color: var(--ink-soft); margin-block-start: 0.5rem; }

/* Prose pages */
.prose { max-inline-size: 48rem; }
.prose > * + * { margin-block-start: 1rem; }
.prose h2 { margin-block-start: 2rem; }
.prose ul { padding-inline-start: 1.2rem; display: grid; gap: 0.3rem; }
.formulas { display: grid; gap: 0.6rem; }
.formulas div { display: grid; grid-template-columns: minmax(0, 13rem) minmax(0, 1fr); gap: 0.2rem 1rem; padding: 0.6rem 0.8rem; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
.formulas dt { font-weight: 700; }
.formulas dd { margin: 0; font-family: var(--mono); }
.pills { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.pills a { display: inline-block; padding: 0.5rem 1rem; border-radius: 2rem; background: var(--graphite); color: #fff; text-decoration: none; font-weight: 600; }

/* Footer */
.foot { background: var(--graphite); color: #d6d1c5; margin-block-start: 1rem; }
.foot-inner { max-width: 78rem; margin-inline: auto; padding: 1.5rem var(--gap) 2rem; display: grid; gap: 0.55rem; font-size: 0.92rem; }
.foot strong { color: #fff; }
.foot a { color: var(--amber); }
@media (hover: hover) and (pointer: fine) { .foot a:hover { color: #fff; } }

@media (max-width: 47.99rem) {
  .wide-nav { display: none; }
  .menu { display: block; flex-basis: 100%; }
  .controls { max-inline-size: none; }
  .formulas div { grid-template-columns: 1fr; }
}