:root {
  --bg: #f4f6f5;
  --surface: #ffffff;
  --surface-2: #eef2f1;
  --border: #d3dbd8;
  --text: #16211f;
  --muted: #5a6b67;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --hot: #d9480f;
  --cold: #1c6dd0;
  --warn-bg: #fff4d6;
  --warn-border: #e2b84a;
  --warn-text: #5c4300;
  --ok: #2b8a3e;
  --bad: #c92a2a;
  --track: #dde5e2;
  --ball: #ffffff;
  --ball-border: #9fb2ad;
  --radius: 10px;
  --gap: 16px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0e1514;
    --surface: #162120;
    --surface-2: #1c2b29;
    --border: #2c3f3c;
    --text: #e4eeec;
    --muted: #91a8a3;
    --accent: #2dd4bf;
    --accent-ink: #052e2a;
    --hot: #ff8a4c;
    --cold: #6aa8ff;
    --warn-bg: #3a2f10;
    --warn-border: #7a6320;
    --warn-text: #f2dd9a;
    --ok: #69db7c;
    --bad: #ff8787;
    --track: #25352f;
    --ball: #1c2b29;
    --ball-border: #4b625d;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
}

h1,
h2,
h3,
p {
  margin: 0;
}

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

.loading,
.error {
  padding: 48px 16px;
  text-align: center;
  color: var(--muted);
}

.error {
  color: var(--bad);
}

/* ---- page frame ------------------------------------------------------ */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand strong {
  font-size: 20px;
  letter-spacing: 0.2px;
}

.brand span {
  color: var(--muted);
  font-size: 13px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 13px;
  color: var(--muted);
}

.chip.ok {
  color: var(--ok);
  border-color: currentColor;
}

.chip.stale {
  color: var(--warn-text);
  background: var(--warn-bg);
  border-color: var(--warn-border);
}

.banner {
  margin: 12px 16px 0;
  padding: 10px 14px;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
  border-radius: var(--radius);
  font-size: 14px;
}

.shell {
  display: grid;
  gap: var(--gap);
  padding: 16px;
  max-width: 1500px;
  margin: 0 auto;
}

@media (min-width: 1000px) {
  .shell {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: start;
  }
}

/* ---- game selector ----------------------------------------------------- */

.games {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

@media (min-width: 1000px) {
  .games {
    flex-direction: column;
    overflow: visible;
    position: sticky;
    top: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
  }
  .games h2 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    padding: 2px 8px;
  }
}

.games h2 {
  display: none;
}

@media (min-width: 1000px) {
  .games h2 {
    display: block;
  }
}

.game-btn {
  flex: 0 0 auto;
  text-align: left;
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  cursor: pointer;
  border-left: 4px solid transparent;
}

@media (min-width: 1000px) {
  .game-btn {
    background: transparent;
  }
}

.game-btn small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.game-btn:hover {
  background: var(--surface-2);
}

.game-btn[aria-current='true'] {
  border-left-color: var(--accent);
  background: var(--surface-2);
  font-weight: 600;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ---- content ----------------------------------------------------------- */

.content {
  min-width: 0;
  display: grid;
  gap: var(--gap);
}

.game-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}

.game-head h1 {
  font-size: 26px;
}

.game-head p {
  color: var(--muted);
}

.grid {
  display: grid;
  gap: var(--gap);
}

@media (min-width: 1100px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .wide {
    grid-column: 1 / -1;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
  min-width: 0;
}

.panel > header {
  margin-bottom: 12px;
}

.panel h2 {
  font-size: 16px;
}

.panel .sub {
  color: var(--muted);
  font-size: 13px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: end;
  margin-bottom: 12px;
  padding: 10px 12px;
  background: var(--surface-2);
  border-radius: 8px;
}

.controls label {
  display: grid;
  gap: 2px;
  font-size: 12px;
  color: var(--muted);
}

.controls select,
.controls input {
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  min-width: 90px;
}

.btn {
  padding: 7px 14px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
}

.btn.secondary {
  background: transparent;
  color: var(--accent);
}

.btn:disabled {
  opacity: 0.5;
  cursor: wait;
}

.note {
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
}

.kv {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 14px;
  font-size: 14px;
  margin-top: 10px;
}

.kv dt {
  color: var(--muted);
}

.kv dd {
  margin: 0;
}

/* ---- balls ------------------------------------------------------------- */

.balls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.ball {
  display: inline-grid;
  place-items: center;
  min-width: 34px;
  height: 34px;
  padding: 0 4px;
  border-radius: 999px;
  border: 2px solid var(--ball-border);
  background: var(--ball);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.ball.small {
  min-width: 26px;
  height: 26px;
  font-size: 13px;
  border-width: 1.5px;
}

.ball.accent {
  border-color: var(--accent);
  color: var(--accent);
}

.tickets {
  display: grid;
  gap: 8px;
}

.ticket {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.ticket .idx {
  color: var(--muted);
  width: 22px;
  font-variant-numeric: tabular-nums;
}

.ticket .meta {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

/* ---- tables ------------------------------------------------------------ */

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

td.num,
th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

tr.baseline td {
  background: var(--surface-2);
}

.good {
  color: var(--ok);
}

.badtxt {
  color: var(--bad);
}

/* ---- heat map ---------------------------------------------------------- */

.heat-row {
  margin-bottom: 12px;
}

.heat-row h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 6px;
}

.heat {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(54px, 1fr));
  gap: 4px;
}

.cell {
  display: grid;
  justify-items: center;
  padding: 4px 2px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  line-height: 1.15;
}

.cell .v {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.cell .c {
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.cell.hot {
  background: color-mix(in srgb, var(--hot) calc(var(--t) * 55%), var(--surface));
}

.cell.cold {
  background: color-mix(in srgb, var(--cold) calc(var(--t) * 55%), var(--surface));
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}

.legend i {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  margin-right: 4px;
  vertical-align: -1px;
}

/* ---- backtest bars ----------------------------------------------------- */

.bar {
  position: relative;
  height: 8px;
  background: var(--track);
  border-radius: 4px;
  min-width: 120px;
}

.bar i {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
}

.bar b {
  position: absolute;
  top: -3px;
  bottom: -3px;
  width: 2px;
  background: var(--text);
}

progress {
  width: 160px;
  accent-color: var(--accent);
}

.verdict {
  margin-top: 12px;
  padding: 10px 12px;
  border-left: 4px solid var(--accent);
  background: var(--surface-2);
  border-radius: 0 8px 8px 0;
}

details summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 14px;
  margin-top: 8px;
}

.footer {
  max-width: 1500px;
  margin: 0 auto;
  padding: 8px 16px 32px;
  color: var(--muted);
  font-size: 12px;
}

a {
  color: var(--accent);
}

a.btn {
  display: inline-block;
  text-decoration: none;
}

.top-right {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

/* ---- "How it works" page ------------------------------------------------ */

.doc {
  max-width: 920px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: var(--gap);
}

.doc h1 {
  font-size: 28px;
  line-height: 1.2;
}

.doc .lead {
  font-size: 17px;
  color: var(--muted);
}

.doc .section-title {
  font-size: 20px;
  margin-top: 8px;
}

.doc h3 {
  font-size: 15px;
  margin: 14px 0 6px;
}

.doc [id] {
  scroll-margin-top: 80px;
}

.toc ol {
  margin: 6px 0 0;
  padding-left: 20px;
  columns: 2 260px;
}

.callout {
  border-left: 4px solid var(--accent);
}

.how {
  margin: 0;
}

.how dt {
  font-weight: 600;
  margin-top: 12px;
}

.how dd {
  margin: 2px 0 0;
}

.how ol,
.steps,
.facts {
  margin: 6px 0;
  padding-left: 22px;
}

.how li,
.steps li,
.facts li {
  margin: 4px 0;
}

.demo-controls {
  position: sticky;
  top: 8px;
  z-index: 2;
  margin-bottom: 0;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgb(0 0 0 / 12%);
}

.strategy .demo {
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--surface-2);
  border-radius: 8px;
}

.demo h3 {
  margin: 0 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.demo .evidence {
  margin-top: 8px;
  font-size: 14px;
}