/* Deliberately plain: dark card-room look, CSS variables, no framework.
   Four-color deck matches the TUI convention (clubs green, diamonds blue). */
:root {
  --bg: #1b2127;
  --panel: #232b33;
  --text: #e8e6e0;
  --muted: #9aa5ad;
  --accent: #d4a94f;      /* gold: primary buttons */
  --card-bg: #f4f2ec;
  --spade: #1d2126;
  --heart: #c0392b;
  --diamond: #2471a3;
  --club: #1e8449;
  --good: #58b368;
  --bad: #d9534f;
  /* action colors: aggression reds, passive green, fold blue-gray */
  --act-fold: #5d7285;
  --act-passive: #3f9e63;
  --act-bet1: #d98243;
  --act-bet2: #c0392b;
  --act-bet3: #8e2437;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header, main, footer { max-width: 62rem; margin: 0 auto; padding: 0 1rem; }
header { padding-top: 1.5rem; }
h1 { margin: 0; font-size: 1.6rem; }
.tagline { color: var(--muted); margin: 0.3rem 0 0.8rem; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; border-bottom: 1px solid #39434d; padding-bottom: 0.8rem; }
nav a { color: var(--accent); text-decoration: none; }
nav a:hover { text-decoration: underline; }
a { color: var(--accent); }

section {
  background: var(--panel);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}
h2 { margin-top: 0; font-size: 1.2rem; }
section > p { color: var(--muted); margin-top: 0; }
code { background: #2e3941; padding: 0 0.3em; border-radius: 3px; }
footer { color: var(--muted); font-size: 0.85rem; padding-bottom: 2rem; }

button {
  font: inherit;
  background: var(--accent);
  color: #21160a;
  border: 0;
  border-radius: 5px;
  padding: 0.35rem 1rem;
  cursor: pointer;
}
button:hover { filter: brightness(1.1); }
button.answer { background: #35414c; color: var(--text); }
.score { color: var(--muted); margin-left: 0.8rem; }

textarea, input, select {
  font: inherit;
  width: 100%;
  background: #171c21;
  color: var(--text);
  border: 1px solid #39434d;
  border-radius: 5px;
  padding: 0.3rem 0.5rem;
}
label { display: block; margin: 0.5rem 0; color: var(--muted); }
label.inline { display: inline-block; width: auto; margin-right: 0.8rem; }
label.inline input, label.inline select { width: auto; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 40rem) { .cols { grid-template-columns: 1fr; } }

/* cards */
.card {
  display: inline-block;
  background: var(--card-bg);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  margin-right: 0.25rem;
  font-weight: 700;
}
.card.spade { color: var(--spade); }
.card.heart { color: var(--heart); }
.card.diamond { color: var(--diamond); }
.card.club { color: var(--club); }
.spotline { margin: 0.7rem 0; font-size: 1.1rem; }
.verdict-good { color: var(--good); font-weight: 700; }
.verdict-bad { color: var(--bad); font-weight: 700; }

/* histograms */
.hist { margin: 0.8rem 0; }
.hist .row { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8rem; }
.hist .lbl { width: 4.5rem; color: var(--muted); text-align: right; }
.hist .bar { background: var(--act-passive); height: 0.75rem; border-radius: 2px; }
.hist .n { color: var(--muted); }

/* 13x13 grid */
#gr-head, #pf-head { margin: 0.6rem 0 0.2rem; color: var(--text); }
#gr-head .sub, #pf-head .sub { color: var(--muted); font-size: 0.85rem; }
#gr-legend { display: flex; gap: 1rem; flex-wrap: wrap; font-size: 0.8rem; color: var(--muted); margin-bottom: 0.5rem; }
#gr-legend .chip { display: inline-block; width: 0.8em; height: 0.8em; border-radius: 2px; margin-right: 0.3em; vertical-align: -0.05em; }
#gr-grid, #pf-grid {
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  gap: 2px;
  max-width: 40rem;
}
#gr-grid .cell, #pf-grid .cell {
  aspect-ratio: 1.35;
  font-size: 0.62rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-shadow: 0 0 2px rgba(0,0,0,0.8);
  border-radius: 2px;
  cursor: pointer;
  background: #2b333b;
}
#gr-grid .cell.dead { color: #5a6570; cursor: default; }
#gr-grid .cell.sel { outline: 2px solid var(--accent); }
#gr-detail { margin-top: 0.8rem; overflow-x: auto; }
#gr-detail table { border-collapse: collapse; font-size: 0.85rem; }
#gr-detail th, #gr-detail td { padding: 0.15rem 0.7rem; text-align: right; border-bottom: 1px solid #39434d; }
#gr-detail th:first-child, #gr-detail td:first-child { text-align: left; }
#gr-detail .best { font-weight: 700; color: var(--good); }