/* Game-Solvers — single-page static site
   Auto light/dark via prefers-color-scheme.
*/

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-hover: #30363d;
  --border-color: #30363d;
  --border-subtle: #21262d;

  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;

  --accent: #2563eb;
  --accent-hover: #3b82f6;
  --accent-subtle: rgba(37, 99, 235, 0.12);

  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --danger-subtle: rgba(248, 81, 73, 0.12);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Consolas', 'Menlo', monospace;

  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 12px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --bg-hover: #d0d7de;
    --border-color: #d0d7de;
    --border-subtle: #eaeef2;
    --text-primary: #1f2328;
    --text-secondary: #57606a;
    --text-muted: #6e7781;
    --accent: #0969da;
    --accent-hover: #1f6feb;
    --accent-subtle: rgba(9, 105, 218, 0.10);
    --success: #1a7f37;
    --warning: #9a6700;
    --danger: #cf222e;
    --danger-subtle: rgba(207, 34, 46, 0.10);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

header.page-header {
  margin-bottom: 24px;
}
header.page-header .header-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
header.page-header h1 {
  margin: 0 0 4px;
  font-size: 1.7rem;
}
header.page-header h1 a {
  color: var(--text-primary);
  text-decoration: none;
}
header.page-header h1 a:hover {
  color: var(--accent);
  text-decoration: none;
}
header.page-header .header-link {
  font-size: 0.95rem;
}
header.page-header .subtitle {
  margin: 0;
  color: var(--text-secondary);
}

/* n-player profile table */
.profile-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 0;
  font-size: 0.9rem;
}
.profile-table th, .profile-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}
.profile-table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
}
.profile-table input {
  width: 70px;
  padding: 4px 6px;
  font-size: 0.85rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
}
.profile-table-scroll {
  max-height: 360px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
}
.nplayer-flat-hidden {
  display: none !important;
}
.nplayer-panel-stack {
  display: grid;
  gap: 16px;
}
.nplayer-panel {
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
  background: var(--bg-primary);
  padding: 12px;
  overflow-x: auto;
}
.nplayer-panel-title {
  margin: 0 0 8px;
  color: var(--text-secondary);
  font-weight: 500;
}
.nplayer-panel table {
  width: auto;
  max-width: 100%;
  border-collapse: separate;
  border-spacing: 6px;
}
.nplayer-panel th {
  color: var(--text-secondary);
  font-size: 0.84rem;
  font-weight: 600;
  text-align: center;
}
.nplayer-panel td {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  padding: 5px;
}
.nplayer-payoff-cell {
  display: grid;
  grid-template-columns: repeat(3, 56px);
  gap: 4px;
  align-items: center;
}
.nplayer-payoff-cell input {
  width: 56px;
  padding: 4px 6px;
  font-size: 0.84rem;
  text-align: center;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
}

/* sections */
section.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 20px;
  margin-bottom: 20px;
}
section.card h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}
section.card .help {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0 0 12px;
}

/* mode toggle */
.mode-toggle {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--r-md);
  padding: 3px;
  border: 1px solid var(--border-color);
}
.mode-toggle button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 7px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.9rem;
}
.mode-toggle button.active {
  background: var(--accent);
  color: #fff;
}

.mode-explainer {
  display: inline-block;
  margin-left: 12px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* tabs */
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 8px 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  font-size: 0.93rem;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* form bits */
label.form-label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 0.9rem;
}
input[type="number"], input[type="text"], textarea, select {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  width: 100%;
}
textarea { resize: vertical; }
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.row > * { flex: 0 0 auto; }
.section-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.section-title-row h2 {
  margin-bottom: 0;
}
.result-format-toggle {
  display: inline-flex;
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--bg-tertiary);
}
.result-format-toggle button {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  padding: 7px 10px;
  cursor: pointer;
  font-size: 0.85rem;
}
.result-format-toggle button.active {
  background: var(--accent);
  color: #fff;
}
.export-panel {
  margin-top: 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--r-md);
  background: var(--bg-primary);
  padding: 12px;
}
.export-panel textarea {
  min-height: 360px;
  white-space: pre;
  overflow: auto;
}
.size-input {
  width: 90px;
  max-width: 90px;
  flex: 0 0 90px;
}

/* buttons */
button.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: var(--r-md);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 150ms ease;
}
button.btn:hover { background: var(--accent-hover); }
button.btn:disabled { opacity: 0.6; cursor: not-allowed; }
button.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
button.btn-secondary:hover { background: var(--bg-hover); }
button.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  font-size: 0.85rem;
  border-radius: var(--r-sm);
  cursor: pointer;
}
button.btn-ghost:hover { color: var(--text-primary); background: var(--bg-tertiary); }

/* preset chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
}
.chip:hover { background: var(--bg-hover); }

/* solver checkboxes */
.solver-panel {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 1.1fr);
  gap: 16px;
  align-items: start;
}
.solve-controls {
  min-width: 0;
}
.solve-controls .mode-explainer {
  display: block;
  margin: 8px 0 0;
}
.solve-run-row {
  margin-top: 10px;
}
.solver-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
  margin-bottom: 0;
}
.solver-grid label {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 10px;
  border-radius: var(--r-md);
  cursor: pointer;
  font-size: 0.92rem;
}
.solver-grid input { accent-color: var(--accent); }
.solver-grid .badge {
  margin-left: auto;
  font-size: 0.7rem;
  background: var(--accent-subtle);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 999px;
}
.solver-grid .badge.disabled {
  background: var(--bg-hover);
  color: var(--text-muted);
}
@media (max-width: 760px) {
  .solver-panel {
    grid-template-columns: 1fr;
  }
}

/* bimatrix grid */
.bimatrix {
  display: inline-grid;
  gap: 6px;
  margin-top: 8px;
  background: var(--bg-tertiary);
  padding: 10px;
  border-radius: var(--r-md);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  max-width: 100%;
}
.bimatrix .cell {
  display: flex;
  gap: 4px;
  background: var(--bg-primary);
  padding: 4px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-subtle);
}
.bimatrix .cell input {
  width: 56px;
  padding: 4px 6px;
  font-size: 0.85rem;
  text-align: center;
}
.bimatrix .col-label, .bimatrix .row-label {
  text-align: center;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.8rem;
  padding: 4px;
}

/* status banner */
.status {
  padding: 10px 12px;
  border-radius: var(--r-md);
  margin-bottom: 12px;
  font-size: 0.9rem;
  display: none;
}
.status.show { display: block; }
.status.info  { background: var(--accent-subtle); color: var(--accent); }
.status.error { background: var(--danger-subtle); color: var(--danger); }
.status.success { background: rgba(63, 185, 80, 0.10); color: var(--success); }

/* result cards */
.result {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 16px;
  margin-bottom: 14px;
}
.result h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.result h3 .tag {
  font-size: 0.7rem;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 400;
}
.result pre {
  background: var(--bg-secondary);
  padding: 10px;
  border-radius: var(--r-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin: 8px 0;
  white-space: pre-wrap;
  word-break: break-word;
}
.result table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0;
  font-size: 0.9rem;
}
.result th, .result td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}
.result th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-secondary);
}
.result td.numeric, .result th.numeric { text-align: right; font-family: var(--font-mono); }
.result .muted { color: var(--text-muted); font-size: 0.85rem; }

/* footer */
footer {
  margin-top: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* small */
.kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-tertiary);
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}