:root {
  color-scheme: light;
  --bg: #f6f5f1;
  --surface: #fcfcfb;
  --surface-2: #efede7;
  --border: #e2e0d8;
  --text: #0b0b0b;
  --text-2: #52514e;
  --muted: #8a8880;
  --accent: #b8860b;        /* coin gold, UI only (never a data series) */
  --accent-ink: #14171f;
  --accent-fill: #f2c230;
  --heads: #2a78d6;         /* categorical slot 1 */
  --tails: #eb6834;         /* categorical slot 2 */
  --ref: #8a8880;           /* reference lines / bands */
  --band: rgba(138, 136, 128, 0.16);
  --grid: rgba(0, 0, 0, 0.07);
  --danger: #c62828;
  --good: #2e7d32;
  --warn: #b26a00;
  --radius: 14px;
  --tap: 48px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #14171f;
    --surface: #1d212b;
    --surface-2: #262b37;
    --border: #2f3542;
    --text: #ffffff;
    --text-2: #c3c2b7;
    --muted: #8f8e86;
    --accent: #f2c230;
    --accent-ink: #14171f;
    --accent-fill: #f2c230;
    --heads: #3987e5;
    --tails: #d95926;
    --ref: #8f8e86;
    --band: rgba(195, 194, 183, 0.14);
    --grid: rgba(255, 255, 255, 0.08);
    --danger: #ef5350;
    --good: #66bb6a;
    --warn: #ffb74d;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  min-height: 100dvh;
  padding: 0 max(16px, env(safe-area-inset-right)) calc(76px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
}
[hidden] { display: none !important; }
button, input, select { font: inherit; color: inherit; }
.num { font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); font-weight: 400; }
.hint { color: var(--text-2); font-size: 0.85rem; margin: 6px 2px; }

/* Header */
.topbar {
  position: sticky; top: 0; z-index: 5;
  margin: 0 calc(-1 * max(16px, env(safe-area-inset-left)));
  padding: calc(env(safe-area-inset-top) + 10px) max(16px, env(safe-area-inset-left)) 10px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  display: flex; align-items: center; gap: 8px; min-height: 52px;
}
.topbar h1 { font-size: 1.6rem; margin: 0; letter-spacing: -0.02em; }
.back {
  background: none; border: 0; color: var(--accent); font-size: 1.05rem;
  min-height: var(--tap); padding: 0 8px 0 0; cursor: pointer;
}

/* Cards and forms */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; margin: 12px 0;
}
.field-label { display: block; font-weight: 600; margin: 4px 2px 6px; }
.big-input, .text-input {
  width: 100%; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-2);
  padding: 12px 14px; min-height: 52px;
}
.big-input { font-size: 1.8rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.text-input { font-size: 17px; }   /* >= 16px so iOS doesn't zoom */
.big-input:focus, .text-input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.quick { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 12px 0 16px; }
.quick button, .secondary, select {
  min-height: var(--tap); border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface-2); font-weight: 600; cursor: pointer;
}
.quick button[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.primary {
  width: 100%; min-height: 56px; margin-top: 16px; border: 0; border-radius: 14px;
  background: var(--accent-fill); color: var(--accent-ink); font-size: 1.2rem; font-weight: 800; cursor: pointer;
}
.primary:disabled { opacity: 0.5; }
.secondary { width: 100%; margin: 12px 0; }
.danger {
  width: 100%; min-height: var(--tap); border-radius: 12px; border: 1px solid var(--danger);
  background: transparent; color: var(--danger); font-weight: 600; margin: 16px 0; cursor: pointer;
}
.error { color: var(--danger); margin-top: 10px; font-weight: 500; }
.empty { text-align: center; color: var(--text-2); padding: 48px 16px; }

/* Coin animation */
.anim { text-align: center; }
.coin-stage { perspective: 600px; height: 132px; display: grid; place-items: center; }
.coin { width: 112px; height: 112px; position: relative; transform-style: preserve-3d; }
.coin .face {
  position: absolute; inset: 0; border-radius: 50%; display: grid; place-items: center;
  font-size: 3rem; font-weight: 800; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border: 6px solid #b8860b; background: radial-gradient(circle at 35% 30%, #ffe27a, #e0a81a);
  color: #14171f;
}
.coin .face.t { transform: rotateY(180deg); }
/* Reduce Motion variant: no rotation, faces cross-fade and the coin dims between tosses. */
.coin.flat { transition: opacity 0.15s ease; }
.coin.flat .face { transition: opacity 0.15s ease; }
.coin.flat .face.t { transform: none; opacity: 0; }
.coin.flat.tails .face.t { opacity: 1; }
.coin.flat.tails .face.h { opacity: 0; }
.coin.flat.dim { opacity: 0.25; }

/* H/T chips */
.chips { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 12px; justify-content: flex-start; }
.anim .chips { justify-content: center; }
.chip {
  width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  font-size: 0.72rem; font-weight: 800; color: #fff;
}
.chip.h { background: var(--heads); }
.chip.t { background: var(--tails); }
.chip.streak { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--text); }
.chip.pop { animation: pop 0.25s ease-out; }
@keyframes pop { from { transform: scale(0.3); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Progress */
.job-head, .job-meta { display: flex; justify-content: space-between; gap: 8px; }
.job-meta { color: var(--text-2); font-size: 0.9rem; margin-top: 8px; }
.bar { height: 12px; border-radius: 6px; background: var(--surface-2); overflow: hidden; margin-top: 10px; }
.bar > div { height: 100%; width: 0; background: var(--accent-fill); border-radius: 6px; transition: width 0.3s linear; }

/* Session view */
.headline { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.side { border-radius: 12px; padding: 12px; background: var(--surface-2); }
.side .label { display: flex; align-items: center; gap: 6px; color: var(--text-2); font-weight: 600; font-size: 0.9rem; }
.side .dot { width: 10px; height: 10px; border-radius: 50%; }
.side .big { font-size: 1.5rem; font-weight: 800; margin-top: 4px; word-break: break-all; }
.side .pct { color: var(--text-2); }
.meta { color: var(--text-2); font-size: 0.85rem; margin-bottom: 10px; }
.verdict { font-weight: 600; margin: 4px 0 10px; display: flex; gap: 8px; align-items: flex-start; }
.verdict .ico { flex: none; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 0.8rem; color: #fff; }
.verdict.ok .ico { background: var(--good); }
.verdict.warn .ico { background: var(--warn); }
.kv { display: grid; grid-template-columns: 1fr auto; gap: 8px 12px; margin: 0; }
.kv dt { color: var(--text-2); }
.kv dd { margin: 0; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
.kv .sub { display: block; font-weight: 400; color: var(--muted); font-size: 0.8rem; }
h2 { font-size: 1.05rem; margin: 0 0 10px; }
.chart-box { position: relative; height: 240px; }
.chart-note { color: var(--muted); font-size: 0.78rem; margin-top: 6px; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.85rem; color: var(--text-2); margin-bottom: 8px; }
.legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; background: var(--c); }
.legend span.line::before { height: 3px; border-radius: 2px; vertical-align: 3px; }
.legend span.band::before { background: var(--band); border: 1px dashed var(--ref); }

/* Log */
.filters { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0 4px; }
select { padding: 0 12px; font-size: 16px; width: 100%; }
.log-list { list-style: none; padding: 0; margin: 8px 0; }
.log-list li {
  display: flex; align-items: center; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 8px; overflow: hidden;
}
.log-list a { flex: 1; min-width: 0; color: inherit; text-decoration: none; padding: 12px 14px; min-height: 64px; }
.log-list .row1 { display: flex; justify-content: space-between; gap: 8px; font-weight: 700; }
.log-list .row1 .lbl { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.log-list .row2 { display: flex; justify-content: space-between; gap: 8px; color: var(--text-2); font-size: 0.85rem; margin-top: 4px; }
.log-list .del {
  flex: none; width: var(--tap); align-self: stretch; border: 0; border-left: 1px solid var(--border);
  background: none; color: var(--danger); font-size: 1.1rem; cursor: pointer;
}

/* Stats */
.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; }
.tile .k { color: var(--text-2); font-size: 0.85rem; }
.tile .v { font-size: 1.35rem; font-weight: 800; margin-top: 2px; font-variant-numeric: tabular-nums; word-break: break-all; }
.records { list-style: none; padding: 0; margin: 0; }
.records li + li { border-top: 1px solid var(--border); }
.records a { display: block; color: inherit; text-decoration: none; padding: 10px 0; min-height: var(--tap); }
.records .rk { color: var(--text-2); font-size: 0.85rem; }
.records .rv { font-weight: 600; }

/* Mode switch */
.seg { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; border-radius: 12px; background: var(--surface-2); margin-bottom: 6px; }
.seg button { min-height: 40px; border: 0; border-radius: 9px; background: transparent; font-weight: 600; color: var(--text-2); cursor: pointer; }
.seg button[aria-checked="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15); }
.mode-help { margin: 0 2px 12px; }

/* Pick mode */
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0 6px; }
.pick-coin {
  display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 14px 8px;
  border: 2px solid var(--border); border-radius: 18px; background: var(--surface-2); cursor: pointer;
  min-height: 150px; touch-action: manipulation; transition: border-color 0.15s, opacity 0.15s, transform 0.15s;
}
.pick-coin:active { transform: scale(0.97); }
.pick-coin .pc-face {
  width: 96px; height: 96px; border-radius: 50%; display: grid; place-items: center;
  font-size: 2.6rem; font-weight: 800; color: #14171f;
  border: 5px solid #b8860b; background: radial-gradient(circle at 35% 30%, #ffe27a, #e0a81a);
}
.pick-coin .pc-name { color: var(--text-2); font-weight: 600; font-size: 0.9rem; }
.pick-coin.h .pc-face { box-shadow: 0 0 0 4px var(--surface-2), 0 0 0 7px var(--heads); }
.pick-coin.t .pc-face { box-shadow: 0 0 0 4px var(--surface-2), 0 0 0 7px var(--tails); }
.pick-coin.chosen { border-color: var(--accent); }
.pick-coin.passed { opacity: 0.35; }
.pick-coin.deal .pc-face { animation: deal 0.28s ease-out; }
@keyframes deal { from { transform: rotateY(90deg); } to { transform: rotateY(0); } }
.pick-hint { text-align: center; }
.pick-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.pick-actions button { margin: 0; }
.resume .pick-actions { margin-top: 10px; }
.badge {
  display: inline-block; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.02em; text-transform: uppercase;
  padding: 2px 6px; border-radius: 6px; background: var(--accent-fill); color: var(--accent-ink); vertical-align: 2px; margin-right: 6px;
}
.rounds { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 12px; }
.round { display: flex; gap: 2px; padding: 2px; border-radius: 15px; background: var(--surface-2); }
.round .chip { width: 22px; height: 22px; font-size: 0.65rem; }
.round .chip.off { opacity: 0.28; }
.filters .span2 { grid-column: span 2; }

/* Tab bar */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  display: grid; grid-template-columns: repeat(3, 1fr);
  padding: 6px max(8px, env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-top: 1px solid var(--border);
}
.tabbar a {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  min-height: 52px; color: var(--muted); text-decoration: none; font-size: 0.75rem; font-weight: 600;
}
.tabbar .ico { font-size: 1.35rem; line-height: 1; }
.tabbar a.active { color: var(--accent); }

/* Dialog */
dialog {
  border: 1px solid var(--border); border-radius: 16px; background: var(--surface); color: var(--text);
  padding: 20px; width: min(92vw, 360px);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.45); }
dialog p { margin: 0 0 16px; font-size: 1.05rem; }
.dialog-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dialog-actions button { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  .chip.pop, .bar > div { animation: none; transition: none; }
  .pick-coin.deal .pc-face { animation: fadein 0.2s ease-out; }
  .pick-coin:active { transform: none; }
}
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }