/* Shared parchment aesthetic — matches hyperclaude.cc/gifts/ocr-bench/ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --paper: #f6f1e7;
  --paper-deep: #ede5d6;
  --paper-soft: #f9f4ec;
  --ink: #202127;
  --ink-soft: #5d6270;
  --ink-faint: #81869a;
  --border: rgba(32, 33, 39, 0.12);
  --border-soft: rgba(32, 33, 39, 0.07);
  --accent: #8d3d2b;
  --accent-soft: #c68f62;
  --green: #315d44;
  --green-soft: #6b9b7e;
  --gold: #b8860b;
  --slate: #232733;
  --code: #171922;
  --code-fg: #e8ebf4;
  --serif: "EB Garamond", Georgia, serif;
  --heading: "Cormorant Garamond", Georgia, serif;
  --mono: "IBM Plex Mono", Menlo, monospace;
  --shadow: 0 8px 24px rgba(42, 45, 57, 0.08);
  --shadow-deep: 0 16px 40px rgba(42, 45, 57, 0.18);
}

html { font-size: 17px; scroll-behavior: smooth; }

body {
  background:
    radial-gradient(circle at top left, rgba(198, 143, 98, 0.10), transparent 28%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.header-strip {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-faint);
}
.header-strip a { color: var(--accent); text-decoration: none; }
.header-strip a:hover { text-decoration: underline; }
.header-strip .title { color: var(--ink); font-family: var(--heading); font-size: 1.05rem; letter-spacing: -0.01em; }

main { max-width: 1180px; margin: 0 auto; padding: 24px 24px 96px; }

h1, h2, h3 {
  font-family: var(--heading);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink);
}
h1 { font-size: 2.4rem; margin: 24px 0 14px; font-weight: 600; }
h2 { font-size: 1.7rem; margin: 38px 0 14px; font-weight: 600; }
h3 { font-size: 1.25rem; margin: 28px 0 10px; font-weight: 600; color: var(--ink-soft); }

p { margin-bottom: 16px; font-size: 1.04rem; max-width: 68ch; }

a { color: var(--accent); text-decoration: none; border-bottom: 1px dotted var(--accent-soft); }
a:hover { border-bottom-style: solid; }

code { font-family: var(--mono); font-size: 0.88em; background: rgba(32, 33, 39, 0.06); padding: 1px 5px; border-radius: 3px; }

blockquote {
  border-left: 3px solid var(--accent-soft);
  padding-left: 16px;
  color: var(--ink-soft);
  margin-bottom: 16px;
  font-style: italic;
}

/* Layered nav */
.layer-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  margin: 18px 0 32px;
}
.layer-nav a, .layer-nav span {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--paper-soft);
  color: var(--ink-soft);
  text-decoration: none;
}
.layer-nav .current {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}
.layer-nav a:hover {
  background: var(--paper-deep);
  border-color: var(--ink-faint);
  color: var(--ink);
}

/* Explorable widget */
.explorable {
  background: var(--paper-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  margin: 32px 0;
  box-shadow: var(--shadow);
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px 24px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 24px;
}

.control {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.control label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.control select, .control input[type="range"], .control input[type="number"] {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
  width: 100%;
}

.control .value-badge {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
}

.control input[type="range"] {
  padding: 0;
  height: 6px;
  appearance: none;
  background: var(--border);
  cursor: pointer;
}
.control input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--paper);
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.panels {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

.panel {
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  background: var(--paper);
  padding: 12px;
}

.panel h3 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.panel canvas {
  width: 100%;
  height: 240px;
  display: block;
}

.panel .panel-note {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
}

/* Worked-example box */
.worked-example {
  background: var(--paper-soft);
  border-left: 4px solid var(--green);
  padding: 18px 24px;
  margin: 32px 0;
  border-radius: 0 4px 4px 0;
}
.worked-example h2 { color: var(--green); font-size: 1.2rem; margin: 0 0 10px; }
.worked-example table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.worked-example td, .worked-example th {
  padding: 4px 12px 4px 0;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
}
.worked-example th { color: var(--ink-faint); font-weight: 500; }

/* Team signoffs */
.signoffs {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.signoffs .ok { color: var(--green); }
.signoffs .pending { color: var(--gold); }
.signoffs .fail { color: var(--accent); }

/* Decisions section */
.decision-flag {
  background: rgba(184, 134, 11, 0.08);
  border-left: 3px solid var(--gold);
  padding: 8px 14px;
  margin: 12px 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.decision-flag strong { color: var(--gold); }

/* Math display */
.equation-display {
  display: block;
  text-align: center;
  margin: 18px 0;
  font-size: 1.05em;
  overflow-x: auto;
}

@media (max-width: 880px) {
  .panels { grid-template-columns: 1fr; }
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.35rem; }
  main { padding: 16px 14px 64px; }
}

.katex-display { overflow-x: auto; overflow-y: hidden; }