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

:root {
  --x-color: #FF2D55;
  --o-color: #00F5FF;
  --gold: #FFD60A;
  --purple: #BF5AF2;
  --bg-dark: #070714;
  --glass: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.10);
  --font-display: 'Bebas Neue', cursive;
  --font-body: 'Syne', sans-serif;
  --font-mono: 'Space Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg-dark);
  color: #fff;
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
  cursor: default;
}

/* ===== ANIMATED BACKGROUND ===== */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: orbFloat 12s ease-in-out infinite alternate;
}

.orb1 { width: 500px; height: 500px; background: radial-gradient(circle, #FF2D55, transparent); top: -150px; left: -150px; animation-duration: 14s; }
.orb2 { width: 400px; height: 400px; background: radial-gradient(circle, #00F5FF, transparent); bottom: -100px; right: -100px; animation-duration: 11s; animation-delay: -3s; }
.orb3 { width: 350px; height: 350px; background: radial-gradient(circle, #BF5AF2, transparent); top: 50%; left: 50%; transform: translate(-50%,-50%); animation-duration: 16s; animation-delay: -6s; }
.orb4 { width: 250px; height: 250px; background: radial-gradient(circle, #FFD60A, transparent); top: 20%; right: 15%; animation-duration: 9s; animation-delay: -2s; }

@keyframes orbFloat {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(40px, -30px) scale(1.1); }
  100% { transform: translate(-20px, 40px) scale(0.95); }
}

.orb3 { animation-name: orb3Float; }
@keyframes orb3Float {
  0%   { transform: translate(-50%,-50%) scale(1); }
  100% { transform: translate(-50%,-50%) scale(1.3); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ===== PARTICLES ===== */
.particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  border-radius: 50%;
  animation: particleDrift linear infinite;
  opacity: 0;
}

@keyframes particleDrift {
  0%   { opacity: 0; transform: translateY(0) scale(0); }
  10%  { opacity: 1; }
  90%  { opacity: 0.6; }
  100% { opacity: 0; transform: translateY(-100vh) scale(1.5); }
}

/* ===== APP CONTAINER ===== */
.app {
  position: relative;
  z-index: 1;
  width: min(480px, 95vw);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.4rem;
}

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

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  margin-bottom: 0.3rem;
}

.logo-x {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--x-color);
  text-shadow: 0 0 20px var(--x-color), 0 0 40px var(--x-color);
  animation: glowPulse 2s ease-in-out infinite alternate;
}

.logo-o {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--o-color);
  text-shadow: 0 0 20px var(--o-color), 0 0 40px var(--o-color);
  animation: glowPulse 2s ease-in-out infinite alternate-reverse;
}

.logo-dot {
  font-size: 0.5rem;
  color: rgba(255,255,255,0.3);
}

@keyframes glowPulse {
  from { text-shadow: 0 0 10px currentColor; }
  to   { text-shadow: 0 0 30px currentColor, 0 0 60px currentColor; }
}

.title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 12vw, 5.5rem);
  letter-spacing: 0.15em;
  line-height: 1;
  background: linear-gradient(135deg, #FF2D55, #BF5AF2, #00F5FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(191,90,242,0.5));
  animation: titleShimmer 5s linear infinite;
  background-size: 200% 200%;
}

@keyframes titleShimmer {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.subtitle {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-top: 0.2rem;
}

/* ===== MODE SELECTOR ===== */
.mode-selector {
  width: 100%;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 1.2rem;
  backdrop-filter: blur(20px);
}

.mode-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  text-align: center;
  margin-bottom: 1rem;
}

.mode-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.mode-card {
  position: relative;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  padding: 1.2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}

.mode-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255,255,255,0.2);
}

.mode-card.active {
  border-color: var(--purple);
  background: rgba(191,90,242,0.12);
  box-shadow: 0 0 20px rgba(191,90,242,0.2), inset 0 0 20px rgba(191,90,242,0.05);
}

.mode-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(191,90,242,0.15), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
}

.mode-card.active .mode-glow { opacity: 1; }

.mode-icon { font-size: 1.8rem; margin-bottom: 0.4rem; }

.mode-label {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.05em;
  color: #fff;
}

.mode-desc {
  font-size: 0.65rem;
  color: rgba(255,255,255,0.4);
  margin-top: 0.2rem;
  font-family: var(--font-mono);
}

/* ===== DIFFICULTY ===== */
.difficulty-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  justify-content: center;
}

.diff-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5);
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.25s;
}

.diff-btn:hover { border-color: var(--gold); color: var(--gold); }

.diff-btn.active {
  background: rgba(255,214,10,0.15);
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 0 12px rgba(255,214,10,0.25);
}

/* ===== SCOREBOARD ===== */
.scoreboard {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 0.8rem;
}

.score-card {
  flex: 1;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1rem;
  text-align: center;
  backdrop-filter: blur(20px);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.score-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--x-color);
  transform: scaleX(0);
  transition: transform 0.4s;
}

#scoreX::before { background: var(--x-color); }
#scoreO::before { background: var(--o-color); }

.score-card.active-turn::before { transform: scaleX(1); }
.score-card.active-turn { border-color: rgba(255,255,255,0.2); }

.score-symbol {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
}

.x-symbol {
  color: var(--x-color);
  text-shadow: 0 0 15px var(--x-color);
}

.o-symbol {
  color: var(--o-color);
  text-shadow: 0 0 15px var(--o-color);
}

.score-name {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: rgba(255,255,255,0.4);
  margin: 0.3rem 0 0.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.score-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  line-height: 1;
  background: linear-gradient(180deg, #fff, rgba(255,255,255,0.6));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.score-vs {
  font-family: var(--font-display);
  font-size: 1rem;
  color: rgba(255,255,255,0.2);
  letter-spacing: 0.1em;
}

.score-draws {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: rgba(255,255,255,0.3);
  text-align: center;
  line-height: 1.4;
  white-space: nowrap;
}

/* ===== STATUS BAR ===== */
.status-bar {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  padding: 0.6rem 1.4rem;
  backdrop-filter: blur(20px);
}

.status-pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold);
  animation: pulse 1.5s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%       { transform: scale(1.5); opacity: 0.5; }
}

#statusText {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.8);
}

/* ===== GAME BOARD ===== */
.board-wrapper {
  width: 100%;
  position: relative;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
  aspect-ratio: 1;
  position: relative;
}

.cell {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: clamp(2rem, 10vw, 4rem);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.cell::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.08), transparent 70%);
  opacity: 0;
  transition: opacity 0.2s;
}

.cell:hover:not(.taken)::before { opacity: 1; }

.cell:hover:not(.taken) {
  border-color: rgba(255,255,255,0.25);
  transform: scale(0.97);
}

.cell:active:not(.taken) { transform: scale(0.93); }

.cell.taken { cursor: default; }

/* X mark */
.cell.x {
  color: var(--x-color);
  text-shadow: 0 0 20px var(--x-color), 0 0 40px rgba(255,45,85,0.5);
  border-color: rgba(255,45,85,0.3);
  background: rgba(255,45,85,0.08);
  animation: cellPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* O mark */
.cell.o {
  color: var(--o-color);
  text-shadow: 0 0 20px var(--o-color), 0 0 40px rgba(0,245,255,0.5);
  border-color: rgba(0,245,255,0.3);
  background: rgba(0,245,255,0.08);
  animation: cellPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes cellPop {
  0%   { transform: scale(0) rotate(-10deg); opacity: 0; }
  60%  { transform: scale(1.15) rotate(3deg); opacity: 1; }
  100% { transform: scale(1) rotate(0deg); }
}

/* Winning cells */
.cell.winner {
  animation: winnerPulse 0.8s ease-in-out infinite alternate;
}

.cell.winner.x {
  background: rgba(255,45,85,0.25);
  border-color: var(--x-color);
  box-shadow: 0 0 25px rgba(255,45,85,0.4), inset 0 0 15px rgba(255,45,85,0.15);
}

.cell.winner.o {
  background: rgba(0,245,255,0.25);
  border-color: var(--o-color);
  box-shadow: 0 0 25px rgba(0,245,255,0.4), inset 0 0 15px rgba(0,245,255,0.15);
}

@keyframes winnerPulse {
  from { transform: scale(1); }
  to   { transform: scale(1.05); }
}

/* Win line SVG */
.win-line {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

#winLineEl {
  stroke-dasharray: 6;
  stroke-dashoffset: 6;
  transition: stroke-dashoffset 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

#winLineEl.draw { stroke-dashoffset: 0; }

/* ===== BUTTONS ===== */
.btn-row {
  display: flex;
  gap: 0.8rem;
  width: 100%;
}

.btn-reset {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.75);
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.25s;
  backdrop-filter: blur(10px);
}

.btn-reset:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.25);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.btn-clear:hover {
  border-color: rgba(255,45,85,0.5);
  color: var(--x-color);
}

/* ===== WIN OVERLAY ===== */
.win-overlay {
  position: fixed;
  inset: 0;
  background: rgba(7,7,20,0.85);
  backdrop-filter: blur(10px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
}

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

.win-box {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 28px;
  padding: 3rem 2.5rem;
  text-align: center;
  backdrop-filter: blur(30px);
  position: relative;
  overflow: hidden;
  transform: scale(0.8);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  max-width: 340px;
  width: 90vw;
}

.win-overlay.show .win-box { transform: scale(1); }

.win-emoji {
  font-size: 4rem;
  animation: emojiPop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  display: block;
  margin-bottom: 0.5rem;
}

@keyframes emojiPop {
  0%   { transform: scale(0) rotate(-30deg); }
  100% { transform: scale(1) rotate(0deg); }
}

.win-title {
  font-family: var(--font-display);
  font-size: 3.5rem;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, #FFD60A, #FF9500);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(255,214,10,0.6));
}

.win-sub {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  margin: 0.7rem 0 1.5rem;
  letter-spacing: 0.1em;
}

.btn-play-again {
  background: linear-gradient(135deg, #BF5AF2, #5E5CE6);
  border: none;
  color: #fff;
  padding: 0.9rem 2rem;
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.25s;
  box-shadow: 0 0 30px rgba(191,90,242,0.4);
}

.btn-play-again:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px rgba(191,90,242,0.6);
}

/* ===== CONFETTI ===== */
.confetti-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  animation: confettiFall linear forwards;
}

@keyframes confettiFall {
  0%   { transform: translateY(-20px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(400px) rotate(720deg); opacity: 0; }
}

/* ===== AI THINKING ===== */
.status-bar.thinking #statusText { opacity: 0.5; }
.status-bar.thinking .status-pulse {
  background: var(--o-color);
  animation: thinkPulse 0.5s ease-in-out infinite;
}

@keyframes thinkPulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(2); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 400px) {
  .app { padding: 1.5rem 1rem; gap: 1rem; }
  .cell { border-radius: 12px; }
  .win-box { padding: 2rem 1.5rem; }
}