:root {
  --bg: #14120f;
  --panel: #1c1a15;
  --panel-raised: #23201a;
  --brass: #c9974f;
  --brass-bright: #e8b968;
  --amber: #e8a838;
  --green: #6fae6a;
  --red: #e2917e;
  --ink: #eee6d6;
  --ink-dim: #a99e8b;
  --ink-faint: #ada392;
  --rule: #3a3428;
  --glow: rgba(232, 168, 56, 0.35);
  --mono: "SF Mono", "IBM Plex Mono", Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Georgia", "Source Serif Pro", serif;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f7f3ea;
    --panel: #fbf7ee;
    --panel-raised: #f1ead9;
    --brass: #8a6030;
    --brass-bright: #6b430f;
    --amber: #7a4610;
    --green: #276a41;
    --red: #963627;
    --ink: #201a12;
    --ink-dim: #5b5142;
    --ink-faint: #5f5647;
    --rule: #ddd2ba;
    --glow: rgba(122, 79, 24, 0.12);
  }
}

:root[data-theme="light"] {
  --bg: #f7f3ea;
  --panel: #fbf7ee;
  --panel-raised: #f1ead9;
  --brass: #8a6030;
  --brass-bright: #6b430f;
  --amber: #7a4610;
  --green: #276a41;
  --red: #963627;
  --ink: #201a12;
  --ink-dim: #5b5142;
  --ink-faint: #5f5647;
  --rule: #ddd2ba;
  --glow: rgba(122, 79, 24, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
}

body {
  background-image:
    radial-gradient(ellipse at top, rgba(201, 151, 79, 0.06), transparent 60%),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px, transparent 1px, transparent 3px);
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

a { color: var(--brass-bright); }
a:hover { color: var(--amber); }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.topbar a { color: var(--ink-dim); text-decoration: none; border-bottom: 1px solid var(--rule); }
.topbar a:hover { color: var(--brass-bright); border-color: var(--brass); }
.topbar-right { display: flex; align-items: center; gap: 16px; }
.lang-switch { display: flex; gap: 10px; }
.lang-switch .current { color: var(--brass-bright); }

.theme-toggle {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  background: var(--panel-raised);
  color: var(--ink-dim);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--brass); }
.theme-toggle[hidden] { display: none; }

header.hero { padding: 48px 0 8px; }

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brass-bright);
  margin-bottom: 18px;
}

h1 {
  font-size: clamp(30px, 5.4vw, 44px);
  line-height: 1.14;
  margin: 0 0 18px;
  font-weight: 600;
  color: var(--ink);
}

.deck {
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink-dim);
  max-width: 60ch;
  margin: 0 0 8px;
}

p { line-height: 1.68; font-size: 17px; color: var(--ink); margin: 0 0 20px; }
.dim { color: var(--ink-dim); }

h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  margin: 56px 0 16px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

h2 .num {
  font-family: var(--mono);
  color: var(--brass-bright);
  font-size: 14px;
  display: block;
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

/* Odometer panel */
.panel {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 24px;
  margin: 28px 0;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), 0 8px 24px rgba(0,0,0,0.14);
}

.odometer-panel { text-align: center; }

.odometer-value {
  font-family: var(--mono);
  font-size: clamp(34px, 8vw, 52px);
  font-weight: 700;
  color: var(--amber);
  text-shadow: 0 0 18px var(--glow);
  letter-spacing: 0.02em;
  min-height: 1.2em;
}

.odometer-step {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.odo-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 90px;
  margin-top: 22px;
  padding-top: 8px;
  border-top: 1px dashed var(--rule);
}

.odometer-play {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 12px;
  background: var(--panel-raised);
  color: var(--ink-dim);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 6px 14px;
  cursor: pointer;
}
.odometer-play:hover { color: var(--ink); border-color: var(--brass); }
.odometer-play[hidden] { display: none; }

.odo-bar {
  flex: 1;
  height: 100%;
  display: flex;
  align-items: flex-end;
  position: relative;
}

.odo-bar-fill {
  width: 100%;
  height: 2%;
  background: var(--ink-faint);
  border-radius: 2px 2px 0 0;
  transition: height 0.15s ease-out;
}

.odo-bar.current .odo-bar-fill { background: var(--amber); }

.odo-bar-label {
  position: absolute;
  bottom: -20px;
  width: 100%;
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}

.odo-bar.current .odo-bar-label { color: var(--brass-bright); }

/* Dataset chart */
.chart-panel { padding-bottom: 40px; }

.set-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.set-toggle button {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  background: var(--panel-raised);
  color: var(--ink-dim);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
}

.set-toggle button:hover { color: var(--ink); border-color: var(--brass); }
.set-toggle button.active {
  color: var(--bg);
  background: var(--brass-bright);
  border-color: var(--brass-bright);
}

.chart {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 200px;
  padding-top: 8px;
}

.bar {
  flex: 1;
  height: 100%;
  display: flex;
  align-items: flex-end;
  position: relative;
}

.bar-fill {
  width: 100%;
  height: 1%;
  background: linear-gradient(180deg, var(--brass-bright), var(--brass));
  border-radius: 3px 3px 0 0;
  transition: height 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.bar-value {
  position: absolute;
  top: -20px;
  width: 100%;
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
}

.bar-digit {
  position: absolute;
  bottom: -22px;
  width: 100%;
  text-align: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-faint);
}

.benford-mark {
  position: absolute;
  width: 100%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--red), var(--red) 4px, transparent 4px, transparent 8px);
  filter: drop-shadow(0 0 1px var(--bg)) drop-shadow(0 0 1px var(--bg));
}

.chart-legend {
  margin-top: 34px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }
.swatch.data { background: var(--brass-bright); }
.swatch.benford { background: var(--red); }

#sample-label, #ratio-label {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--brass-bright);
  margin-top: 18px;
}
#ratio-label { color: var(--ink-dim); margin-top: 4px; }

/* Gauge */
.gauge-panel { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }

.gauge {
  width: 150px;
  height: 90px;
  position: relative;
  flex-shrink: 0;
}

.gauge-arc {
  width: 150px;
  height: 75px;
  border-radius: 75px 75px 0 0;
  background: conic-gradient(from 270deg at 50% 100%,
    var(--red) 0deg, var(--red) 117deg,
    var(--amber) 117deg, var(--amber) 158.4deg,
    var(--green) 158.4deg, var(--green) 180deg);
  position: relative;
  overflow: hidden;
}

.gauge-arc::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; top: 12px; bottom: 0;
  background: var(--panel);
  border-radius: 63px 63px 0 0;
}

.gauge-needle {
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 2px;
  height: 66px;
  background: var(--ink);
  transform-origin: bottom center;
  transform: rotate(0deg);
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.gauge-needle::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: -5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
}

.gauge-score {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  text-align: center;
  margin-top: 6px;
}

#gauge-label { color: var(--brass-bright); font-size: 15px; }

.gauge-verdict { flex: 1; min-width: 220px; }
.gauge-verdict p { margin: 0; font-size: 16px; color: var(--ink); }
.gauge-verdict[data-level="ok"] { color: var(--green); }
.gauge-verdict[data-level="mid"] { color: var(--amber); }
.gauge-verdict[data-level="flag"] { color: var(--red); }

/* Own numbers */
.own-panel label {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 8px;
}

.own-panel textarea {
  width: 100%;
  min-height: 110px;
  background: var(--panel-raised);
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  padding: 12px;
  resize: vertical;
}

.own-panel textarea::placeholder { color: var(--ink-faint); }

.own-panel button {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 13px;
  background: var(--brass-bright);
  color: var(--bg);
  border: none;
  border-radius: 4px;
  padding: 10px 18px;
  cursor: pointer;
}

.own-panel button:hover { background: var(--amber); }

#own-error {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--red);
  margin-top: 10px;
  min-height: 1em;
}

.limits {
  border-left: 2px solid var(--brass);
  padding-left: 16px;
  margin: 24px 0;
  color: var(--ink-dim);
  font-size: 15px;
}

.method {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  color: var(--ink-faint);
  line-height: 1.6;
}

.method a { color: var(--ink-dim); }

footer {
  margin-top: 40px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .bar-fill, .odo-bar-fill, .gauge-needle { transition: none; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 16px 60px; }
  .topbar { padding: 16px 16px 0; }
  .chart { gap: 5px; }
  .odo-bars { gap: 3px; }
  .gauge-panel { flex-direction: column; align-items: flex-start; }
}