/* style.css — Clean minimal styling for Tic-Tac-Toe vs. Bot */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f0f4f8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px;
  color: #1a202c;
}

/* ── Title ── */
.game-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 32px;
  text-align: center;
  letter-spacing: 1px;
  color: #2d3748;
}

/* ── Selection Screen ── */
#selection-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  width: 100%;
  max-width: 400px;
}

.selection-prompt {
  font-size: 1.2rem;
  color: #4a5568;
}

.symbol-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.symbol-btn {
  width: 140px;
  height: 64px;
  font-size: 1.2rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: #4299e1;
  color: #fff;
  transition: background 0.2s, transform 0.1s;
}

.symbol-btn:hover {
  background: #2b6cb0;
  transform: translateY(-2px);
}

.symbol-btn:active {
  transform: translateY(0);
}

/* ── Difficulty Toggle ── */
.difficulty-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: #4a5568;
}

.diff-option {
  font-weight: 500;
}

.diff-active {
  font-weight: 700;
  color: #2d3748;
  min-width: 36px;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: #cbd5e0;
  border-radius: 26px;
  transition: background 0.2s;
}

.slider::before {
  content: '';
  position: absolute;
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle-switch input:checked + .slider {
  background: #48bb78;
}

.toggle-switch input:checked + .slider::before {
  transform: translateX(22px);
}

/* ── Game Screen ── */
#game-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 400px;
}

.hidden {
  display: none !important;
}

/* ── Assignment Label ── */
.assignment-label {
  font-size: 0.95rem;
  color: #4a5568;
  font-weight: 500;
  text-align: center;
}

/* ── Turn Indicator ── */
.turn-indicator {
  font-size: 1.1rem;
  font-weight: 600;
  color: #2b6cb0;
  min-height: 1.5em;
  text-align: center;
}

/* ── Board ── */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  width: 100%;
  max-width: 300px;
}

.cell {
  min-width: 80px;
  min-height: 80px;
  background: #fff;
  border: 2px solid #a0aec0;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  font-weight: 700;
  cursor: pointer;
  color: #2d3748;
  transition: background 0.15s, border-color 0.15s;
  user-select: none;
  aspect-ratio: 1;
}

.cell:hover:not(.filled) {
  background: #ebf8ff;
  border-color: #4299e1;
}

.cell.filled {
  cursor: default;
}

.cell.winning {
  background: #c6f6d5;
  border-color: #38a169;
  color: #22543d;
}

/* ── Result Message ── */
.result-message {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  color: #2d3748;
  margin-top: 8px;
}

/* ── Play Again Button ── */
.play-again-btn {
  margin-top: 4px;
  padding: 12px 36px;
  font-size: 1.05rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: #48bb78;
  color: #fff;
  transition: background 0.2s, transform 0.1s;
}

.play-again-btn:hover {
  background: #276749;
  transform: translateY(-2px);
}

.play-again-btn:active {
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 360px) {
  .game-title {
    font-size: 1.4rem;
  }

  .symbol-btn {
    width: 120px;
    height: 56px;
    font-size: 1rem;
  }

  .board {
    max-width: 270px;
  }

  .cell {
    min-width: 70px;
    min-height: 70px;
    font-size: 1.8rem;
  }

  .result-message {
    font-size: 1.4rem;
  }
}

@media (max-width: 320px) {
  .board {
    max-width: 240px;
  }

  .cell {
    min-width: 60px;
    min-height: 60px;
    font-size: 1.5rem;
  }
}