:root {
  --ink: #1c1410;
  --ink-soft: #3d2f26;
  --wood-deep: #8b5a2b;
  --wood-mid: #c48a3a;
  --wood-light: #e2b56a;
  --line: rgba(40, 24, 12, 0.78);
  --black-stone: #1a1a1a;
  --white-stone: #f7f1e6;
  --accent: #0f5c4c;
  --accent-soft: #1a7a66;
  --danger: #8b2e2e;
  --panel: rgba(255, 248, 235, 0.88);
  --shadow: 0 24px 60px rgba(28, 20, 16, 0.28);
  --radius: 18px;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Serif SC", "Songti SC", serif;
}

body.game-page {
  overflow-x: hidden;
}

.app {
  display: grid;
  gap: 1.25rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 1.25rem;
  align-items: start;
  animation: rise 900ms 80ms ease both;
}

.board-wrap {
  position: relative;
  background:
    linear-gradient(145deg, rgba(255, 236, 200, 0.14), transparent 40%),
    linear-gradient(180deg, #d29a4a 0%, #b87932 45%, #9a5f24 100%);
  border-radius: var(--radius);
  padding: clamp(0.75rem, 2vw, 1.25rem);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 230, 180, 0.25);
}

.board-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 15%, rgba(255, 255, 255, 0.12), transparent 35%),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 11px,
      rgba(80, 40, 10, 0.03) 11px,
      rgba(80, 40, 10, 0.03) 12px
    );
}

#board {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  cursor: crosshair;
  touch-action: none;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 240, 200, 0.35), transparent 40%),
    linear-gradient(180deg, var(--wood-light), var(--wood-mid));
  box-shadow: inset 0 0 0 1px rgba(70, 40, 10, 0.2);
  position: relative;
  z-index: 1;
}

.panel {
  display: grid;
  gap: 0.9rem;
}

.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.turn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.05rem;
}

.stone-dot {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  box-shadow: inset -2px -2px 3px rgba(0, 0, 0, 0.35),
    inset 2px 2px 3px rgba(255, 255, 255, 0.25);
}

.stone-dot.black {
  background: radial-gradient(circle at 35% 30%, #555, var(--black-stone));
}

.stone-dot.white {
  background: radial-gradient(circle at 35% 30%, #fff, var(--white-stone));
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.badge {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: rgba(15, 92, 76, 0.1);
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
}

.meta {
  display: grid;
  gap: 0.35rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.message {
  min-height: 1.4em;
  margin-top: 0.7rem;
  font-size: 0.92rem;
  color: var(--danger);
}

.message.info {
  color: var(--accent-soft);
}

.message.warn {
  color: var(--danger);
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

button,
select {
  font-family: inherit;
}

button {
  appearance: none;
  border: none;
  border-radius: 12px;
  padding: 0.7rem 0.85rem;
  background: var(--accent);
  color: #f7fff9;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, opacity 160ms ease;
}

button:hover:not(:disabled) {
  background: var(--accent-soft);
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid rgba(61, 47, 38, 0.28);
}

button.secondary:hover:not(:disabled) {
  background: rgba(61, 47, 38, 0.06);
}

button.danger {
  background: var(--danger);
}

.field {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.65rem;
}

.field label {
  font-size: 0.85rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.field select {
  border: 1px solid rgba(61, 47, 38, 0.25);
  border-radius: 10px;
  padding: 0.55rem 0.7rem;
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  font-size: 0.95rem;
}

.ai-options {
  display: grid;
  gap: 0;
  margin-bottom: 0.15rem;
  padding: 0.55rem 0.65rem 0.15rem;
  border-radius: 12px;
  background: rgba(15, 92, 76, 0.07);
  border: 1px solid rgba(15, 92, 76, 0.12);
  animation: pulseIn 360ms ease both;
}

.ai-options[hidden] {
  display: none !important;
}

.help {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--ink-soft);
}

.help li {
  margin-bottom: 0.25rem;
}

.result-banner {
  display: none;
  margin-top: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  background: linear-gradient(120deg, rgba(15, 92, 76, 0.14), rgba(196, 138, 58, 0.18));
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  animation: pulseIn 420ms ease both;
}

.result-banner.show {
  display: block;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .board-wrap {
    padding: 0.45rem;
  }

  .status-row {
    flex-wrap: wrap;
  }
}