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

:root {
  --bg: #0b0d17;
  --surface: rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.08);
  --x-color: #f87c7c;
  --x-glow: rgba(248,124,124,0.4);
  --o-color: #7eb8f7;
  --o-glow: rgba(126,184,247,0.4);
  --accent: #c084fc;
  --accent-glow: rgba(192,132,252,0.3);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --draw-color: #facc15;
  --win-highlight: rgba(250,204,21,0.15);
  --radius: 20px;
  --cell-radius: 16px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
  position: relative;
}

/* === Background Orbs === */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.25;
  animation: float 8s ease-in-out infinite;
}

.orb-1 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #7c3aed, transparent);
  top: -10%; left: -10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #0ea5e9, transparent);
  bottom: -10%; right: -5%;
  animation-delay: 3s;
}

.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #ec4899, transparent);
  top: 50%; left: 60%;
  animation-delay: 6s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

/* === Container === */
.container {
  position: relative;
  z-index: 1;
  width: min(480px, 95vw);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

/* === Header === */
.header {
  text-align: center;
}

.title {
  font-size: clamp(2.4rem, 8vw, 3.2rem);
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--text);
  line-height: 1;
}

.title .accent {
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding: 0 2px;
}

.subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 0.4rem;
  font-weight: 300;
}

/* === Mode Selector === */
.mode-selector {
  display: flex;
  gap: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px;
  width: 100%;
  max-width: 320px;
}

.mode-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 50px;
  background: transparent;
  color: var(--muted);
  font-family: 'Outfit', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.mode-btn .mode-icon { font-size: 1.1rem; }

.mode-btn.active {
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.mode-btn:not(.active):hover {
  background: var(--surface-hover);
  color: var(--text);
}

/* === Scoreboard === */
.scoreboard {
  display: flex;
  gap: 0.75rem;
  width: 100%;
}

.score-card {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 0.75rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform 0.2s, box-shadow 0.2s;
}

.score-card.active-turn {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(255,255,255,0.06);
}

.score-symbol {
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 0.3rem;
}

.x-symbol { color: var(--x-color); text-shadow: 0 0 12px var(--x-glow); }
.o-symbol { color: var(--o-color); text-shadow: 0 0 12px var(--o-glow); }
.draw-symbol { color: var(--draw-color); }

.score-label {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.score-value {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0.2rem;
  line-height: 1;
}

#scoreX .score-value { color: var(--x-color); }
#scoreO .score-value { color: var(--o-color); }
.draws .score-value { color: var(--draw-color); }

/* === Turn Indicator === */
.turn-indicator {
  width: 100%;
  display: flex;
  justify-content: center;
}

.turn-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.5rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.turn-symbol {
  font-size: 1.1rem;
  font-weight: 900;
  transition: color 0.3s;
}

.turn-badge.x-turn .turn-symbol { color: var(--x-color); }
.turn-badge.o-turn .turn-symbol { color: var(--o-color); }

/* === Board === */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1;
  padding: 4px;
}

.cell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--cell-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(2.5rem, 10vw, 3.8rem);
  font-weight: 900;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  user-select: none;
  backdrop-filter: blur(8px);
}

.cell::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--surface-hover);
  opacity: 0;
  transition: opacity 0.2s;
  border-radius: inherit;
}

.cell:hover:not(.taken)::before { opacity: 1; }
.cell:hover:not(.taken) { transform: scale(1.04); }
.cell:active:not(.taken) { transform: scale(0.97); }

.cell.x-cell {
  color: var(--x-color);
  text-shadow: 0 0 20px var(--x-glow);
  border-color: rgba(248,124,124,0.2);
  background: rgba(248,124,124,0.06);
}

.cell.o-cell {
  color: var(--o-color);
  text-shadow: 0 0 20px var(--o-glow);
  border-color: rgba(126,184,247,0.2);
  background: rgba(126,184,247,0.06);
}

.cell.taken { cursor: not-allowed; }

.cell.winner {
  background: var(--win-highlight);
  border-color: var(--draw-color);
  box-shadow: 0 0 20px rgba(250,204,21,0.3), inset 0 0 20px rgba(250,204,21,0.1);
  animation: winPulse 0.6s ease forwards;
}

@keyframes winPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1.05); }
}

/* Cell pop-in animation */
@keyframes popIn {
  0% { transform: scale(0) rotate(-10deg); opacity: 0; }
  70% { transform: scale(1.15) rotate(5deg); }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.cell-content {
  animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  display: inline-block;
}

/* === Action Buttons === */
.actions {
  display: flex;
  gap: 0.75rem;
  width: 100%;
}

.btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 50px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-reset {
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-reset:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-clear {
  background: var(--surface);
  color: var(--muted);
}

.btn-clear:hover {
  background: rgba(248,113,113,0.1);
  border-color: rgba(248,113,113,0.3);
  color: #f87171;
  transform: translateY(-2px);
}

/* === Win Overlay === */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.overlay.show {
  opacity: 1;
  pointer-events: all;
}

.result-card {
  background: rgba(15,18,30,0.95);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 2.5rem 3rem;
  text-align: center;
  transform: scale(0.6) translateY(40px);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  min-width: 280px;
}

.overlay.show .result-card {
  transform: scale(1) translateY(0);
}

.result-emoji {
  font-size: 4rem;
  margin-bottom: 0.5rem;
  animation: bounce 0.6s ease 0.3s both;
}

@keyframes bounce {
  0% { transform: scale(0); }
  60% { transform: scale(1.25); }
  100% { transform: scale(1); }
}

.result-title {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3rem;
}

.result-sub {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.btn-play-again {
  width: 100%;
  padding: 0.9rem;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  color: white;
  border: none;
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-play-again:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

/* === Confetti Canvas === */
#confettiCanvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 200;
  width: 100%;
  height: 100%;
}

/* === AI Thinking Indicator === */
.thinking {
  animation: thinkingPulse 0.8s ease-in-out infinite;
}

@keyframes thinkingPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* === Responsive === */
@media (max-width: 400px) {
  .container { padding: 1.2rem 1rem; gap: 1rem; }
  .board { gap: 8px; }
  .scoreboard { gap: 0.5rem; }
  .score-card { padding: 0.75rem 0.5rem; }
  .actions { flex-direction: column; }
}