/* 井字過三關 — 疊在 styles.css 之上 */

.ttt-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 1rem 0 0.5rem;
  flex-wrap: wrap;
}

.ttt-progress-label {
  font-size: 0.95rem;
  color: rgba(246, 240, 230, 0.85);
}

.ttt-stages {
  display: flex;
  gap: 0.5rem;
}

.ttt-stage {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(160, 195, 255, 0.25);
  color: rgba(246, 240, 230, 0.5);
  transition: border-color 0.2s, background 0.2s, color 0.2s, transform 0.2s;
}

.ttt-stage.current {
  border-color: var(--accent);
  color: #fff;
  background: rgba(99, 102, 241, 0.25);
  transform: scale(1.08);
}

.ttt-stage.done {
  border-color: #34d399;
  background: rgba(52, 211, 153, 0.2);
  color: #a7f3d0;
}

.ttt-board-wrap {
  display: flex;
  justify-content: center;
  padding: 1.25rem 0 2rem;
}

.ttt-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: min(90vw, 320px);
  aspect-ratio: 1;
  padding: 12px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(40, 35, 55, 0.95), rgba(20, 18, 35, 0.98));
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.45),
    inset 0 0 0 1px rgba(120, 160, 255, 0.15);
}

.ttt-cell {
  position: relative;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-family: inherit;
  font-size: clamp(2rem, 10vw, 3rem);
  font-weight: 800;
  color: var(--paper);
  background: rgba(255, 255, 255, 0.06);
  transition: background 0.15s, transform 0.1s;
}

.ttt-cell:hover:not(:disabled) {
  background: rgba(99, 102, 241, 0.22);
}

.ttt-cell:active:not(:disabled) {
  transform: scale(0.96);
}

.ttt-cell:disabled {
  cursor: default;
  opacity: 0.95;
}

.ttt-cell.x {
  color: #93c5fd;
  text-shadow: 0 0 20px rgba(147, 197, 253, 0.5);
}

.ttt-cell.o {
  color: #fca5a5;
  text-shadow: 0 0 20px rgba(252, 165, 165, 0.45);
}

.ttt-hint {
  text-align: center;
  font-size: 0.9rem;
  color: rgba(246, 240, 230, 0.65);
  max-width: 28rem;
  margin: 0 auto;
  line-height: 1.5;
}

.ttt-rules {
  max-width: 32rem;
  margin: 2rem auto 0;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(120, 160, 255, 0.12);
  font-size: 0.88rem;
  color: rgba(246, 240, 230, 0.75);
  line-height: 1.55;
}

.ttt-rules h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--paper);
}

.ttt-rules p {
  margin: 0;
}