/* Drafting table. Ink on graph paper, plus one red. */
:root {
  color-scheme: light;
  --ground: #e7efe4;
  --vellum: rgba(244, 247, 242, 0.92);
  --ink: #1a1f1a;
  --mute: #3c453c;
  --signal: #d01212;
  --pencil: #5c665c;
  --sans: "Instrument Sans", "Helvetica Neue", sans-serif;
  --display: "Bricolage Grotesque", "Arial Black", sans-serif;
  --mono: "Space Mono", ui-monospace, monospace;
}

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

html, body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

body {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.45;
  background-color: var(--ground);
  background-image:
    linear-gradient(to right, rgba(26, 31, 26, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(26, 31, 26, 0.09) 1px, transparent 1px),
    linear-gradient(to right, rgba(26, 31, 26, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(26, 31, 26, 0.22) 1px, transparent 1px);
  background-size: 20px 20px, 20px 20px, 100px 100px, 100px 100px;
  background-position: -1px -1px;
}

::selection { background: var(--signal); color: #fff; }

a { color: inherit; }
code { font-family: var(--mono); font-size: 0.86em; }
button, input { font: inherit; color: inherit; }
button { cursor: crosshair; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

h1, h2, .formula {
  font-family: var(--display);
  font-weight: 720;
  letter-spacing: -0.045em;
  line-height: 0.86;
}

.num, .eyebrow, .brand, .stamp, .stats dt, .stats dd,
.reelbar a, output, .factors, .matrix, .mono, .tails, .orders button, .rev {
  font-family: var(--mono);
}

/* Hub: one plate */
.plate {
  position: relative;
  min-height: calc(100vh - 28px);
  margin: 14px;
  border: 1.5px solid var(--ink);
  outline: 1px solid var(--ink);
  outline-offset: 5px;
  padding: 22px 28px 16px;
}

.arc {
  position: absolute;
  border: 1px solid rgba(26, 31, 26, 0.55);
  border-radius: 50%;
  pointer-events: none;
}
.arc.a { width: 540px; height: 540px; left: -180px; top: -250px; }
.arc.b { width: 340px; height: 340px; left: -20px; top: -70px; border-style: dashed; }

.reg {
  position: absolute;
  width: 16px; height: 16px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  z-index: 3;
}
.reg::before, .reg::after {
  content: "";
  position: absolute;
  background: var(--ink);
}
.reg::before { left: 50%; top: -7px; bottom: -7px; width: 1px; margin-left: -0.5px; }
.reg::after { top: 50%; left: -7px; right: -7px; height: 1px; margin-top: -0.5px; }
.reg.tl { left: -8px; top: -8px; }
.reg.tr { right: -8px; top: -8px; }
.reg.bl { left: -8px; bottom: -8px; }
.reg.br { right: -8px; bottom: -8px; }

.hero { position: relative; z-index: 1; max-width: 68%; }
.rev {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font-size: clamp(3.4rem, 6.6vw, 7rem);
  line-height: 0.78;
}
.hero h1 span { display: block; }
.hero h1 .open {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--ink);
}
.dimension { position: relative; max-width: 640px; height: 28px; margin-top: 10px; }
.dimension svg { width: 100%; height: 28px; display: block; }
.dimension span {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -58%);
  background: var(--ground);
  padding: 0 8px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.deck { max-width: 36rem; margin: 12px 0 0; font-size: 1.05rem; }

.protractor {
  position: absolute;
  right: 18px; top: 12px;
  width: min(400px, 36vw);
  height: auto;
  color: var(--ink);
  pointer-events: none;
}

.bom {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 40px;
  position: relative;
  z-index: 1;
}
.bom li { border-top: 1px solid rgba(26, 31, 26, 0.45); }
.bom a {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 4px 12px;
  text-decoration: none;
  color: inherit;
}
.balloon {
  width: 36px; height: 36px;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 12px;
}
.bom h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 720;
  font-size: clamp(1.25rem, 1.6vw, 1.7rem);
  letter-spacing: -0.03em;
  line-height: 1;
  overflow-wrap: break-word;
}
.bom p { margin: 4px 0 0; line-height: 1.3; font-size: 0.98rem; }
.bom .where {
  margin-top: 3px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--signal);
}
.bom a:hover .balloon,
.bom a:focus-visible .balloon {
  background: var(--signal);
  color: #fff;
  border-color: var(--signal);
}

.block {
  margin: 18px 0 4px auto;
  width: min(460px, 100%);
  border: 1.5px solid var(--ink);
  background: var(--vellum);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  position: relative;
  z-index: 1;
}
.block p {
  margin: 0;
  padding: 7px 10px;
  border-bottom: 1px solid var(--ink);
  border-right: 1px solid var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.block .span { grid-column: 1 / -1; text-transform: none; letter-spacing: 0; font-family: var(--sans); font-size: 0.95rem; }
.block a { color: var(--signal); }

/* Lessons */
body.demo {
  min-height: 100vh;
  min-height: 100dvh;
  border: 1.5px solid var(--ink);
}

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 1.1rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1.5px solid var(--ink);
  background: transparent;
}
.brand {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--signal);
}
.eyebrow {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.chip { margin-left: auto; }
.stats { display: flex; gap: 0.9rem; margin: 0; }
.stats dt {
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mute);
}
.stats dd { margin: 0; font-size: 0.95rem; }

.stage {
  position: relative;
  height: 54vh;
  min-height: 280px;
  background: transparent;
  border-bottom: 1px solid var(--ink);
  cursor: crosshair;
}
body.sheet .stage { background: transparent; }
canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  background: var(--ground);
}

.dock {
  padding: 0.7rem 0.95rem 1.1rem;
  background: transparent;
}
.index-no {
  margin: 0;
  font-family: var(--display);
  font-weight: 720;
  font-size: clamp(3.4rem, 10vw, 5.6rem);
  line-height: 0.78;
  letter-spacing: -0.06em;
  color: var(--signal);
}
.dock h1 {
  margin: 0.15rem 0 0.45rem;
  font-size: clamp(2rem, 4vw, 3.1rem);
  max-width: 16ch;
}
.lede, .dock p { margin: 0.35rem 0; }
.lede { max-width: 42rem; }
.dock h2 {
  margin: 0.8rem 0 0.3rem;
  font-size: clamp(1.4rem, 2vw, 1.8rem);
}
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.7rem;
}

button.quiet, .orders button {
  min-height: 44px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding: 0.4rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.orders { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.6rem 0; }
.orders button { flex: 1 1 7rem; }
.orders button[aria-pressed="true"] { color: var(--signal); border-bottom-color: var(--signal); }

.field { display: grid; gap: 0.15rem; margin: 0.65rem 0; }
.field > span {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: baseline;
}
output { font-size: 0.82rem; }
input[type="range"] {
  width: 100%;
  height: 32px;
  accent-color: var(--signal);
}
input[type="number"] {
  font-family: var(--mono);
  font-size: 1rem;
  width: 6rem;
  min-height: 44px;
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--ground);
}
.check {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  min-height: 44px;
}
.factors {
  margin: 0.45rem 0;
  white-space: pre;
  font-size: 0.8rem;
  line-height: 1.45;
}
.formula { margin: 0.2rem 0; font-size: clamp(1.6rem, 3vw, 2.2rem); }

.tails {
  list-style: none;
  margin: 0.35rem 0 0.6rem;
  padding: 0;
  border-top: 1px solid var(--ink);
}
.tails li {
  display: grid;
  grid-template-columns: 0.75rem 6.2rem minmax(0, 1fr);
  gap: 0.45rem;
  align-items: center;
  padding: 0.35rem 0.25rem;
  font-size: 0.75rem;
  border-bottom: 1px solid rgba(26, 31, 26, 0.35);
}
.tails li.is-selected { color: var(--signal); }
.swatch { width: 0.7rem; height: 0.7rem; display: block; background: var(--ink); }
.swatch.clay { background: var(--signal); }
.swatch.moss { background: var(--ink); }
.swatch.navy { background: transparent; border: 1.5px solid var(--ink); }

.matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
  margin-top: 0.35rem;
}
.matrix caption {
  caption-side: top;
  text-align: left;
  font-family: var(--sans);
  font-size: 0.92rem;
  margin-bottom: 0.25rem;
}
.matrix td { padding: 0.16rem 0.4rem; text-align: right; }
.matrix td:last-child { color: var(--signal); font-weight: 700; }
.matrix.measure td:last-child { color: inherit; font-weight: 400; }
.matrix td.is-hot { color: var(--signal); font-weight: 700; }
.fine { color: var(--mute); font-size: 0.95rem; }
.used {
  margin: 0.85rem 0 0.15rem;
  padding: 0.15rem 0 0.1rem 0.7rem;
  border-left: 2px solid var(--signal);
}
.used summary {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  cursor: pointer;
}
.used summary::-webkit-details-marker { display: none; }
.used summary::marker { content: ""; }
.used summary::before {
  content: "Note  ";
  color: var(--ink);
}
.used ul { margin: 0.4rem 0 0; padding: 0 0 0 1.05rem; }
.used li { margin: 0.32rem 0; font-size: 0.95rem; line-height: 1.35; }
.used li::marker { color: var(--signal); }
.next { margin-top: 0.9rem; }
.next a, .block a { text-underline-offset: 0.16em; }

.reelbar {
  overflow-x: auto;
  border-top: 1.5px solid var(--ink);
  background: transparent;
}
.reelbar-track {
  display: flex;
  gap: 1.2rem;
  width: max-content;
  padding: 0.65rem 0.9rem;
  align-items: center;
}
.reelbar a {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
}
.reelbar a[aria-current="page"] {
  color: var(--signal);
  border-bottom: 1px solid var(--signal);
}
.reel-clone { display: none !important; }

.stamps {
  position: absolute;
  z-index: 1;
  top: 0.7rem;
  left: 0.7rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  pointer-events: none;
}
.stamps p {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--ground);
  border: 1px solid var(--ink);
  padding: 0.28rem 0.45rem;
}
.stamps p[data-kind="point"] { border-left: 6px solid var(--signal); }
.stamps p[data-kind="dir"] { border-left: 6px solid var(--ink); }

.status {
  position: fixed;
  z-index: 5;
  left: 0.8rem;
  bottom: 3.2rem;
  margin: 0;
  max-width: min(36rem, calc(100vw - 1.6rem));
  padding: 0.7rem 0.8rem;
  background: var(--ground);
  color: var(--ink);
  border: 1.5px solid var(--ink);
  border-left: 6px solid var(--signal);
}

@media (min-width: 900px) {
  body.demo {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(18rem, 30rem) minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr) auto;
    margin: 12px;
    min-height: 0;
    border: 1.5px solid var(--ink);
    outline: 1px solid var(--ink);
    outline-offset: 5px;
  }
  .top { grid-column: 1 / -1; grid-row: 1; }
  .dock {
    grid-column: 1;
    grid-row: 2;
    overflow: auto;
    border-right: 1.5px solid var(--ink);
  }
  .stage {
    grid-column: 2;
    grid-row: 2;
    height: auto;
    min-height: 0;
    border-bottom: 0;
  }
  .reelbar { grid-column: 1 / -1; grid-row: 3; }
}

@media (max-width: 899px) {
  .plate { margin: 10px; padding: 16px 12px 12px; outline-offset: 0; }
  .hero { max-width: none; }
  .protractor, .arc { display: none; }
  .bom { grid-template-columns: 1fr; gap: 0; margin-top: 18px; }
  .hero h1 { font-size: 3.3rem; }
  .dimension { max-width: none; }
  .chip { margin-left: 0; }
  body.demo { margin: 0; }
}

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