/* Tic-tac-toe — paper chrome (standalone leaf UI). */
:root {
  --guld-ink: #353e55;
  --guld-navy: #264175;
  --guld-white: #ffffff;
  --guld-mist: #f4f6f9;
  --guld-paper: #e8ecf2;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
  --font-body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--guld-ink);
  background:
    radial-gradient(ellipse 90% 50% at 50% -10%, #dfe6f0 0%, transparent 55%),
    linear-gradient(180deg, var(--guld-mist) 0%, var(--guld-paper) 100%);
}

.ttt {
  --ttt-line: color-mix(in srgb, var(--guld-ink) 28%, transparent);
  --ttt-cell: var(--guld-white);
  --ttt-mark: var(--guld-ink);
  --ttt-accent: var(--guld-navy);
  --ttt-muted: color-mix(in srgb, var(--guld-ink) 62%, transparent);
  max-width: 36rem;
  margin: 0 auto;
  padding: 1.5rem 1.15rem 3rem;
}

.ttt__head h1 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ttt-mark);
}

.ttt__lede {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--ttt-muted);
}

.ttt__lede a,
.ttt__hint a,
.ttt__tx-id a {
  color: var(--ttt-accent);
}

.ttt__status {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ttt-mark);
}

.ttt__status[data-state="ok"] {
  color: #1f5c2c;
}

.ttt__status[data-state="error"] {
  color: #8b1e1e;
}

.ttt__status[data-state="pending"] {
  color: var(--ttt-muted);
}

.ttt__board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
  margin: 0.5rem 0 1rem;
  aspect-ratio: 1;
  max-width: 28rem;
}

.ttt__cell {
  appearance: none;
  border: 2px solid var(--ttt-line);
  border-radius: 0.35rem;
  background: var(--ttt-cell);
  color: var(--ttt-mark);
  font-family: var(--font-display);
  font-size: clamp(2rem, 9vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  cursor: pointer;
  min-height: 4.5rem;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--guld-ink) 6%, transparent);
}

.ttt__cell:hover:not(:disabled) {
  border-color: var(--ttt-accent);
  color: var(--ttt-accent);
}

.ttt__cell:disabled {
  cursor: default;
  opacity: 1;
  color: var(--ttt-mark);
}

.ttt__cell--mine:not(:disabled) {
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--guld-ink) 6%, transparent),
    0 0 0 2px color-mix(in srgb, var(--ttt-accent) 28%, transparent);
}

.ttt__meta {
  font-size: 0.95rem;
  color: var(--ttt-muted);
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.ttt__meta code {
  color: var(--ttt-mark);
  word-break: break-all;
  font-family: var(--font-mono);
  font-size: 0.82em;
}

.ttt__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.85rem 0;
}

.btn {
  appearance: none;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--ttt-line);
  border-radius: 0.3rem;
  background: var(--ttt-cell);
  color: var(--ttt-mark);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--ttt-accent);
  color: var(--ttt-accent);
}

.btn--primary {
  background: var(--ttt-accent);
  border-color: var(--ttt-accent);
  color: #fff;
}

.btn--primary:hover {
  filter: brightness(1.08);
  color: #fff;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.ttt__section {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ttt-line);
}

.ttt__section > summary,
.ttt__advanced > summary {
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ttt-mark);
  list-style: none;
}

.ttt__section > summary::-webkit-details-marker,
.ttt__advanced > summary::-webkit-details-marker {
  display: none;
}

.ttt__section > summary::before,
.ttt__advanced > summary::before {
  content: "▸ ";
  color: var(--ttt-accent);
}

.ttt__section[open] > summary::before,
.ttt__advanced[open] > summary::before {
  content: "▾ ";
}

.ttt__section-title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ttt-mark);
}

.ttt__panel {
  margin-top: 0.75rem;
}

.ttt__panel label {
  display: block;
  font-size: 0.85rem;
  color: var(--ttt-muted);
  margin-bottom: 0.25rem;
}

.ttt__panel input,
.ttt__explore-form input,
.ttt__dlg input {
  width: 100%;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ttt-mark);
  background: var(--ttt-cell);
  border: 1px solid var(--ttt-line);
  border-radius: 0.25rem;
  padding: 0.4rem 0.55rem;
}

.ttt__hint {
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--ttt-muted);
  margin: 0.35rem 0 0.75rem;
}

.ttt__card {
  border: 1px solid var(--ttt-line);
  border-radius: 0.35rem;
  padding: 0.7rem 0.85rem;
  margin: 0.45rem 0;
  background: color-mix(in srgb, var(--guld-white) 88%, var(--guld-mist));
  display: grid;
  gap: 0.25rem;
}

.ttt__card button {
  justify-self: start;
}

.ttt__card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.65rem;
  font-size: 0.9rem;
  color: var(--ttt-mark);
}

.ttt__tx-history {
  margin-top: 1.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--ttt-line);
  border-radius: 0.4rem;
  background: color-mix(in srgb, var(--guld-mist) 70%, var(--ttt-cell));
}

.ttt__tx-title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ttt-mark);
}

.ttt__tx-lead {
  margin: 0 0 0.85rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--ttt-muted);
}

.ttt__tx-lead code {
  font-size: 0.9em;
  color: var(--ttt-mark);
}

.ttt__tip-row {
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
  color: var(--ttt-muted);
  word-break: break-all;
}

.ttt__tip-row code {
  color: var(--ttt-mark);
  font-family: var(--font-mono);
  font-size: 0.82em;
}

.ttt__tx-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  max-height: 18rem;
  overflow: auto;
}

.ttt__tx-list:empty {
  display: none;
}

.ttt__tx-empty {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ttt-muted);
}

.ttt__tx-history:has(.ttt__tx-list:not(:empty)) .ttt__tx-empty {
  display: none;
}

.ttt__tx-item {
  display: grid;
  gap: 0.2rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid color-mix(in srgb, var(--ttt-line) 70%, transparent);
}

.ttt__tx-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.ttt__tx-item-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.65rem;
  font-size: 0.9rem;
  color: var(--ttt-mark);
}

.ttt__tx-pill {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.12rem 0.4rem;
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--ttt-accent) 14%, transparent);
  color: var(--ttt-accent);
}

.ttt__tx-pill[data-status="sealed"] {
  background: color-mix(in srgb, #2a7a3a 16%, transparent);
  color: #1f5c2c;
}

.ttt__tx-pill[data-status="local"] {
  background: color-mix(in srgb, #b8860b 18%, transparent);
  color: #8a6500;
}

.ttt__tx-explain {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--ttt-muted);
}

.ttt__tx-id {
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.ttt__explore-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: end;
  margin: 0.5rem 0;
}

.ttt__explore-form label {
  flex: 1 1 12rem;
  font-size: 0.85rem;
  color: var(--ttt-muted);
}

.ttt__explore-out {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--ttt-muted);
}

.ttt__explore-out pre {
  margin: 0.5rem 0 0;
  padding: 0.75rem;
  overflow: auto;
  max-height: 22rem;
  background: var(--ttt-cell);
  border: 1px solid var(--ttt-line);
  border-radius: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ttt-mark);
}

.ttt__advanced {
  margin-top: 1.75rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--ttt-line);
}

.ttt__advanced > summary {
  font-weight: 600;
  color: var(--ttt-muted);
}

.ttt__dlg {
  border: 1px solid var(--ttt-line);
  border-radius: 0.4rem;
  padding: 1.15rem 1.25rem;
  background: var(--ttt-cell);
  color: var(--ttt-mark);
  max-width: 22rem;
}

.ttt__dlg::backdrop {
  background: color-mix(in srgb, var(--guld-ink) 35%, transparent);
}

.ttt__dlg h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
}

.ttt__dlg menu {
  padding: 0;
  margin: 0.5rem 0 0;
}

.ttt__muted {
  opacity: 0.75;
}

@media (max-width: 420px) {
  .ttt__board {
    max-width: 100%;
  }
}