/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Nunito', sans-serif;
  background: #1a1a2e;
  color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* === Topbar === */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: linear-gradient(135deg, #ff6b35, #e85d2a);
  color: #fff;
  font-family: 'Nunito', sans-serif;
  position: sticky;
  top: 0;
  z-index: 100;
}

.btn-back {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  transition: background 0.2s;
}

.btn-back:hover {
  background: rgba(255,255,255,0.2);
}

.game-title {
  font-size: 1.2rem;
  font-weight: 800;
}

.placeholder {
  width: 60px;
}

/* === Game Container === */
.game-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.2rem 1rem 2rem;
  gap: 1rem;
  max-width: 500px;
  margin: 0 auto;
  width: 100%;
}

/* === Scoreboard === */
.scoreboard {
  display: flex;
  gap: 1rem;
  width: 100%;
  justify-content: center;
}

.score-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 0.6rem 1.2rem;
  min-width: 80px;
}

.score-label {
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.score-value {
  font-size: 1.8rem;
  font-weight: 800;
}

.player-score .score-value { color: #4dabf7; }
.draw-score .score-value { color: #ffd43b; }
.cpu-score .score-value { color: #ff6b6b; }

/* === Turn Indicator === */
.turn-indicator {
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.4rem 1.2rem;
  border-radius: 20px;
  background: rgba(255,255,255,0.1);
  transition: all 0.3s;
}

.turn-indicator.player-turn {
  background: rgba(77, 171, 247, 0.2);
  color: #4dabf7;
}

.turn-indicator.cpu-turn {
  background: rgba(255, 107, 107, 0.2);
  color: #ff6b6b;
}

/* === Board === */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 6px;
  width: min(90vw, 360px);
  height: min(90vw, 360px);
  background: #ff6b35;
  border-radius: 16px;
  padding: 6px;
  box-shadow: 0 8px 32px rgba(255, 107, 53, 0.3);
}

.cell {
  background: #16213e;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: min(18vw, 5rem);
  font-weight: 800;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  line-height: 1;
}

.cell:hover:not(.taken) {
  background: #1a2744;
  transform: scale(1.03);
}

.cell:active:not(.taken) {
  transform: scale(0.97);
}

.cell.taken {
  cursor: default;
}

.cell.x {
  color: #4dabf7;
  text-shadow: 0 0 20px rgba(77, 171, 247, 0.4);
}

.cell.o {
  color: #ff6b6b;
  text-shadow: 0 0 20px rgba(255, 107, 107, 0.4);
}

/* Winning cells */
.cell.winner {
  animation: winPulse 0.6s ease-in-out infinite alternate;
  background: rgba(255, 212, 59, 0.15);
}

@keyframes winPulse {
  from { transform: scale(1); }
  to { transform: scale(1.08); }
}

/* Cell appear animation */
.cell.pop {
  animation: popIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes popIn {
  0% { transform: scale(0); }
  100% { transform: scale(1); }
}

/* === Buttons === */
.btn {
  border: none;
  border-radius: 12px;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.7rem 2rem;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
}

.btn:active {
  transform: scale(0.96);
}

.btn-orange {
  background: linear-gradient(135deg, #ff6b35, #e85d2a);
  color: #fff;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}

.btn-orange:hover {
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.6);
  transform: translateY(-1px);
}

/* === Modal === */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 200;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-overlay.visible {
  display: flex;
}

.modal {
  background: #16213e;
  border-radius: 20px;
  padding: 2rem 2.5rem;
  text-align: center;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalIn {
  0% { transform: scale(0.7); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.modal-icon {
  font-size: 3.5rem;
  margin-bottom: 0.5rem;
}

.modal-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 0.3rem;
}

.modal-msg {
  font-size: 1rem;
  opacity: 0.8;
  margin-bottom: 1.2rem;
}

/* === Responsive === */
@media (max-width: 400px) {
  .topbar { padding: 0.5rem 0.7rem; }
  .game-title { font-size: 1rem; }
  .scoreboard { gap: 0.5rem; }
  .score-item { padding: 0.4rem 0.8rem; min-width: 65px; }
  .score-value { font-size: 1.4rem; }
  .score-label { font-size: 0.65rem; }
}

@media (min-width: 600px) {
  .game-container { padding-top: 2rem; }
}

@media (orientation: landscape) and (max-height: 500px) {
  .board {
    width: min(55vh, 300px);
    height: min(55vh, 300px);
  }
  .game-container { padding: 0.5rem 1rem 1rem; gap: 0.5rem; }
  .scoreboard { gap: 0.4rem; }
  .score-item { padding: 0.3rem 0.6rem; }
  .score-value { font-size: 1.2rem; }
}

/* ===== SEO GAME INFO SECTION ===== */
.game-info {
  max-width: 780px;
  margin: 1rem auto;
  padding: 1rem 1.2rem;
  background: rgba(0,0,0,0.15);
  border-radius: 12px;
  color: rgba(255,255,255,0.85);
  font-size: 0.88rem;
  line-height: 1.6;
}
.game-info h2 { font-size: 1.1rem; font-weight: 800; margin-bottom: 0.5rem; }
.game-info h3 { font-size: 0.95rem; font-weight: 700; margin: 0.8rem 0 0.3rem; }
.game-info ul { padding-left: 1.2rem; }
.game-info li { margin-bottom: 0.2rem; }