:root {
  color-scheme: dark;
  --bg: #141614;
  --card: #1e221c;
  --card-edge: #31362e;
  --text: #f4f1e8;
  --muted: #c9c3b4;
  --brass: #e2a53a;
  --brass-deep: #a8741c;
  --line: #efe8d6;
  --warn-bg: #3a2c18;
  --warn-text: #f3d7a8;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.4;
}

main {
  width: min(100%, 40rem);
  margin: 0 auto;
  padding: 1.25rem 1rem calc(2rem + env(safe-area-inset-bottom));
}

a { color: inherit; }

.sitenav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}

.sitenav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.4rem;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--card-edge);
  border-radius: 999px;
  background: var(--card);
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.sitenav a[aria-current="page"] {
  border-color: var(--brass);
  color: var(--brass);
}

.sitenav a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

header h1, .toolcard h2 {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.toolcard h2 { font-size: 1.25rem; }

#langs {
  flex: 0 0 auto;
  height: 2.4rem;
  max-width: 11rem;
  margin: 0 0 0 auto;
  padding: 0 0.35rem 0 0.65rem;
  border: 1px solid var(--card-edge);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 650;
}

header p, .toolcard p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.choices, .modes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

button, input { font: inherit; color: inherit; }

button {
  border: 1px solid var(--card-edge);
  border-radius: 12px;
  background: #2a3028;
  cursor: pointer;
}

button:disabled {
  opacity: 0.35;
  cursor: default;
}

button:active:not(:disabled) { background: #3c4438; }

.choices button,
.modes button {
  flex: 0 0 auto;
  height: 2.4rem;
  min-width: 2.75rem;
  padding: 0 0.6rem;
  font-size: 0.92rem;
  font-weight: 650;
}

.choices button.primary { min-width: 4.2rem; }

.choices button[aria-pressed="true"],
.modes button[aria-pressed="true"] {
  background: #3a3424;
  border-color: var(--brass);
  color: var(--brass);
}

.tools {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.1rem;
}

.toolcard {
  display: block;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 16px;
  box-shadow: var(--shadow);
  text-decoration: none;
}

.toolcard:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.panel {
  margin-top: 1.1rem;
  padding: 0.9rem;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.field + .field,
.modes + .field,
.choices + .measure { margin-top: 0.85rem; }

label, .field-label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.stepper, .angle-row, .measure {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stepper > button {
  flex: 0 0 3rem;
  height: 3rem;
  font-size: 1.6rem;
  line-height: 1;
}

.stepper .measure { flex: 1 1 auto; min-width: 0; }

input[type="number"],
input[type="text"] {
  width: 100%;
  height: 3rem;
  border: 1px solid var(--card-edge);
  border-radius: 12px;
  background: #151815;
  text-align: center;
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
}

input[readonly] {
  color: var(--brass);
  border-color: #5c4a28;
}

input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="range"] {
  flex: 1 1 auto;
  height: 3rem;
  margin: 0;
  accent-color: var(--brass);
}

.angle-number, .measure {
  position: relative;
}

.angle-number { flex: 0 0 6.4rem; }

.angle-row .measure { flex: 0 0 7.4rem; }

.measure input,
.angle-number input { padding-right: 2.3rem; }

.angle-number input { padding-right: 1.4rem; }

.measure span,
.angle-number span {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}

.scale {
  display: flex;
  justify-content: space-between;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.results { padding-bottom: 1rem; }

.results h2, .panel h2 {
  margin: 0 0 0.7rem;
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.result + .result {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--card-edge);
}

.result-label { display: block; color: var(--muted); }

.value {
  margin: 0.1rem 0;
  font-size: clamp(2.4rem, 12vw, 3.4rem);
  font-weight: 650;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.05;
}

.value.pos-list {
  font-size: clamp(1.1rem, 4.5vw, 1.45rem);
  font-weight: 650;
  word-break: break-word;
}

.hint, .explain, .method, .note {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.explain, .note { margin-top: 0.9rem; }

.method { margin-top: 0.45rem; font-size: 0.88rem; }

.limit {
  margin: 0.85rem 0 0;
  padding: 0.7rem 0.8rem;
  border-radius: 12px;
  background: var(--warn-bg);
  color: var(--warn-text);
}

.figures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

figure {
  margin: 0;
  padding: 0.55rem 0.55rem 0.7rem;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 16px;
}

figcaption {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

svg { display: block; width: 100%; height: auto; overflow: hidden; }

svg .void { fill: #243024; }
svg .board { fill: none; stroke: var(--line); stroke-width: 9; stroke-linecap: butt; }
svg .plumb { fill: none; stroke: var(--muted); stroke-width: 1.6; stroke-dasharray: 5 4; }
svg .arc { fill: none; stroke: var(--brass); stroke-width: 2.4; }
svg .ground, svg .fence { stroke: var(--brass-deep); stroke-width: 2.4; }
svg .angle-label, svg .dim-label { fill: var(--brass); font-size: 15px; font-weight: 650; }
svg .plumb-label, svg .small-label { fill: var(--muted); font-size: 13px; }
svg .plan-shape, svg .stock { fill: #2a3324; stroke: var(--line); stroke-width: 2.4; stroke-linejoin: round; }
svg .plan-joint, svg .apex { fill: var(--brass); }
svg .cove-curve { fill: none; stroke: var(--brass); stroke-width: 2.6; stroke-linejoin: round; }
svg .blade { stroke: var(--line); stroke-linecap: butt; }
svg .joint-board { fill: #2a3324; stroke: var(--line); stroke-width: 1.6; }
svg .joint-pin { fill: #8a6230; stroke: #f4f1e8; stroke-width: 1.4; stroke-linejoin: round; }
svg .joint-tail { fill: #c4a15a; stroke: #f4f1e8; stroke-width: 1.4; stroke-linejoin: round; }
svg .joint-seam { fill: none; stroke: var(--brass-deep); stroke-width: 2; }
svg .joint-floor { fill: none; stroke: var(--brass); stroke-width: 1.8; stroke-dasharray: 5 4; }
svg .joint-lip { fill: #efe8d6; stroke: #a8741c; stroke-width: 1.4; }
svg .joint-on-lip { fill: #3a2c18; font-size: 13px; font-weight: 650; }
svg .joint-dim { fill: none; stroke: var(--brass); stroke-width: 1.3; }

.joint-figures { grid-template-columns: 1fr; }

details.fold > summary {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
  list-style: none;
  font: inherit;
  color: inherit;
}

details.fold > summary::-webkit-details-marker { display: none; }

details.fold > summary:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.fold-label {
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.fold-value {
  margin-left: auto;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

details.fold > summary::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  margin-left: 0.15rem;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  flex: 0 0 auto;
}

details.fold:not(:has(.fold-value)) > summary::after { margin-left: auto; }

details.fold[open] > summary::after { transform: rotate(45deg); }

details.panel.fold[open] > summary { margin-bottom: 0.7rem; }

details.figures-fold { margin-top: 1.1rem; }

details.figures-fold > summary {
  min-height: 2.75rem;
  padding: 0.75rem 0.9rem;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

details.figures-fold[open] > summary { margin-bottom: 0.75rem; }

@media (max-width: 640px) {
  .figures { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  main { padding: 0.45rem 0.75rem calc(0.35rem + env(safe-area-inset-bottom)); }

  .sitenav {
    flex-wrap: nowrap;
    overflow-x: auto;
    margin-bottom: 0.45rem;
    scrollbar-width: none;
  }

  .sitenav::-webkit-scrollbar { display: none; }

  .sitenav a,
  #langs { flex: 0 0 auto; }

  #title { font-size: 1.35rem; }

  header p#intro { display: none; }

  .panel,
  details.figures-fold { margin-top: 0.5rem; }

  .panel { padding: 0.55rem 0.65rem; }

  .field + .field,
  .modes + .field,
  .choices + .measure { margin-top: 0.4rem; }

  .field:has(> .stepper) {
    display: flex;
    align-items: center;
    gap: 0.45rem;
  }

  .field:has(> .stepper) > label {
    flex: 1 1 auto;
    min-width: 0;
    margin-bottom: 0;
  }

  .field:has(> .stepper) > .stepper { flex: 0 0 13.25rem; }

  section.panel .note { display: none; }

  .result {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.6rem;
  }

  .result + .result {
    margin-top: 0.28rem;
    padding-top: 0.28rem;
  }

  .result .hint,
  .explain,
  .method { display: none; }

  .value { font-size: 1.45rem; }
}

@media (max-width: 380px) {
  .angle-row { flex-wrap: wrap; justify-content: center; }
  input[type="range"] { flex-basis: 100%; }
  .angle-number { flex: 0 0 8rem; }
}