:root {
  --ink: #0b2233;
  --ink-2: #123249;
  --ink-3: #17415c;
  --paper: #f3ead4;
  --paper-2: #e9dcb9;
  --paper-ink: #2a2011;
  --paper-ink-dim: #6b5e40;
  --brass: #cea24d;
  --brass-bright: #e8bd6b;
  --text: #e8ecdf;
  --text-dim: #9fb3bd;
  --coral: #d9694f;
  --rule: rgba(232, 236, 223, 0.14);
  --font-serif: 'PT Serif', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --wrap: 760px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse 900px 500px at 12% -8%, rgba(206, 162, 77, 0.10), transparent 60%),
              radial-gradient(ellipse 700px 500px at 96% 6%, rgba(23, 65, 92, 0.55), transparent 55%);
  pointer-events: none;
  z-index: 0;
}

.topbar {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--rule);
}
.topbar a { color: var(--text-dim); text-decoration: none; }
.topbar a:hover { color: var(--brass-bright); }
.lang-switch { display: flex; gap: 12px; align-items: center; }
.lang-switch .current { color: var(--brass-bright); }

.wrap {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.hero { margin-bottom: 36px; }
.kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 14px;
}
h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 40px;
  line-height: 1.2;
  margin: 0 0 18px;
  color: #fbf6ea;
  letter-spacing: -0.01em;
}
.deck {
  font-size: 19px;
  line-height: 1.6;
  color: var(--text-dim);
  max-width: 62ch;
}
.deck strong { color: var(--text); font-weight: 600; }

h2 {
  font-family: var(--font-serif);
  font-size: 25px;
  font-weight: 700;
  color: #fbf6ea;
  margin: 52px 0 16px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
h2 .num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brass);
  border: 1px solid var(--brass);
  border-radius: 3px;
  padding: 2px 6px;
  letter-spacing: 0.04em;
}
h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  color: #fbf6ea;
  margin: 28px 0 10px;
}

p { margin: 0 0 18px; }
a { color: var(--brass-bright); }
.dim { color: var(--text-dim); }
strong { color: #fbf6ea; }
em.q { font-style: italic; color: var(--brass-bright); }

.limits {
  border-left: 3px solid var(--coral);
  padding: 2px 0 2px 18px;
  color: var(--text-dim);
  font-size: 16.5px;
}
.limits p { margin-bottom: 12px; }
.limits p:last-child { margin-bottom: 0; }

.method {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
  border-top: 1px solid var(--rule);
  padding-top: 22px;
  margin-top: 44px;
}
.method a { color: var(--text-dim); text-decoration-color: var(--rule); }

/* ---- chart / map panel: a lit sheet of chart paper on the dark page ---- */
.panel {
  background: var(--paper);
  border-radius: 6px;
  padding: 26px 26px 22px;
  box-shadow: 0 24px 60px -20px rgba(0,0,0,0.55), 0 0 0 1px rgba(0,0,0,0.08);
  color: var(--paper-ink);
  margin: 26px 0;
}
.panel-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-ink-dim);
  margin-bottom: 4px;
}

.compass-panel .map-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 620 / 640;
  max-height: 520px;
}
.compass-panel svg { width: 100%; height: 100%; display: block; }
.coast-full { fill: none; stroke: rgba(42,32,17,0.16); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.coast-hops { fill: none; stroke: var(--coral); stroke-width: 2.6; stroke-linejoin: round; stroke-linecap: round; }
.coast-vertex { fill: var(--coral); }
.coast-vertex.anchor { fill: #2a2011; }

.readouts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 20px;
  margin-top: 16px;
}
.readout .label { font-family: var(--font-mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--paper-ink-dim); }
.readout .value { font-family: var(--font-mono); font-size: 26px; font-weight: 500; color: var(--paper-ink); }
.readout .value small { font-size: 15px; font-weight: 400; color: var(--paper-ink-dim); }

.slider-row { margin-top: 20px; }
.slider-row label { display: block; font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--paper-ink-dim); margin-bottom: 8px; }
input[type="range"] {
  width: 100%;
  accent-color: var(--coral);
  height: 22px;
}
.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--paper-ink-dim);
  margin-top: 2px;
}
.preset-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.preset-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(42,32,17,0.06);
  border: 1px solid rgba(42,32,17,0.18);
  color: var(--paper-ink);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
}
.preset-btn:hover, .preset-btn.active { background: var(--coral); border-color: var(--coral); color: #fff; }

/* ---- log-log chart ---- */
.chart-panel svg { width: 100%; height: auto; display: block; }
.chart-axis { stroke: rgba(42,32,17,0.35); stroke-width: 1; }
.chart-grid { stroke: rgba(42,32,17,0.10); stroke-width: 1; }
.chart-line { fill: none; stroke: var(--paper-ink); stroke-width: 2; }
.chart-fit { fill: none; stroke: var(--coral); stroke-width: 2; stroke-dasharray: 5 4; }
.chart-dot { fill: var(--paper-ink); }
.chart-label { font-family: var(--font-mono); font-size: 11px; fill: var(--paper-ink-dim); }
.chart-marker-line { stroke: var(--coral); stroke-width: 1.4; stroke-dasharray: 3 3; }
.chart-marker-label { font-family: var(--font-mono); font-size: 11px; fill: var(--coral); font-weight: 600; }

table.rdata { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 13px; margin-top: 18px; }
table.rdata caption { text-align: left; font-size: 11.5px; color: var(--paper-ink-dim); margin-bottom: 8px; letter-spacing: 0.06em; text-transform: uppercase; }
table.rdata th, table.rdata td { text-align: right; padding: 6px 10px; border-bottom: 1px solid rgba(42,32,17,0.12); }
table.rdata th:first-child, table.rdata td:first-child { text-align: left; }
table.rdata tbody tr:hover { background: rgba(42,32,17,0.05); }

/* ---- comparison ladder ---- */
.ladder { margin: 22px 0; }
.ladder-row { display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 14px; padding: 10px 0; border-bottom: 1px solid rgba(42,32,17,0.10); }
.ladder-row .rank { font-family: var(--font-mono); font-size: 13px; color: var(--paper-ink-dim); }
.ladder-row:last-child { border-bottom: none; }
.ladder-row .d-value { font-family: var(--font-mono); font-size: 16px; text-align: right; color: var(--paper-ink); }
.ladder-row .place { font-size: 16px; }
.ladder-row .place .src { display: block; font-family: var(--font-mono); font-size: 11px; color: var(--paper-ink-dim); margin-top: 2px; }
.ladder-track { position: relative; height: 10px; background: rgba(42,32,17,0.08); border-radius: 5px; grid-column: 1 / -1; margin-top: -2px; margin-bottom: 4px; }
.ladder-mark { position: absolute; top: -5px; width: 3px; height: 20px; background: var(--paper-ink-dim); border-radius: 2px; }
.ladder-row.self { background: rgba(217, 105, 79, 0.10); border-radius: 4px; padding-left: 8px; padding-right: 8px; margin-left: -8px; margin-right: -8px; }
.ladder-row.self .ladder-mark { background: var(--coral); width: 4px; }
.ladder-row.self .d-value, .ladder-row.self .place { color: #a83a20; font-weight: 700; }
.ladder-row.self .place .src { color: #a8764f; }

footer {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  border-top: 1px solid var(--rule);
  padding-top: 22px;
  margin-top: 44px;
}
footer a { color: var(--text-dim); }

@media (max-width: 640px) {
  h1 { font-size: 30px; }
  .deck { font-size: 17px; }
  body { font-size: 17px; }
  .readouts { grid-template-columns: 1fr; }
  .wrap { padding: 40px 18px 60px; }
  .panel { padding: 18px 16px; }
  .ladder-row { grid-template-columns: 34px 1fr auto; }
}

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