:root {
  --bg-1: #0d0f24;
  --bg-2: #1c1140;
  --cyan: #22d3ee;
  --pink: #f472b6;
  --glass: rgba(255, 255, 255, 0.06);
  --glass-strong: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.14);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.55);
}

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

html,
body {
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 100%);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
}

/* ---------- background blobs ---------- */
.bg-blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
  z-index: 0;
}

.blob-cyan {
  width: 340px;
  height: 340px;
  left: -120px;
  top: 8%;
  background: var(--cyan);
  opacity: 0.2;
}

.blob-magenta {
  width: 380px;
  height: 380px;
  right: -140px;
  bottom: 4%;
  background: var(--pink);
  opacity: 0.16;
}

/* ---------- layout ---------- */
.app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding:
    calc(28px + env(safe-area-inset-top))
    16px
    calc(28px + env(safe-area-inset-bottom));
}

.title {
  font-size: clamp(28px, 8vw, 34px);
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, var(--cyan), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- scoreboard ---------- */
.scoreboard {
  display: flex;
  gap: 10px;
  width: 100%;
}

.chip {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.chip-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
}

.chip-value {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.chip-x { color: var(--cyan); }
.chip-o { color: var(--pink); }

.chip-value.pop {
  animation: score-pop 320ms ease;
}

@keyframes score-pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.35); }
  100% { transform: scale(1); }
}

/* ---------- status ---------- */
.status {
  height: 20px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: opacity 150ms ease;
}

.status.fading { opacity: 0; }

.status.thinking .status-text {
  animation: status-pulse 900ms ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ---------- board ---------- */
.board-wrap {
  position: relative;
}

.board {
  width: min(88vw, 340px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 10px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 24px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  user-select: none;
  -webkit-user-select: none;
}

.board.shake {
  animation: shake 450ms ease;
  border-color: rgba(244, 63, 94, 0.5);
  box-shadow: 0 0 34px rgba(244, 63, 94, 0.3);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(3px); }
}

.board.pulse {
  animation: board-pulse 600ms ease;
}

@keyframes board-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.03); }
}

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.cell.empty:active {
  background: var(--glass-strong);
  border-color: rgba(255, 255, 255, 0.25);
}

@media (hover: hover) {
  .cell.empty:hover {
    background: var(--glass-strong);
    border-color: rgba(255, 255, 255, 0.25);
    box-shadow: 0 0 18px rgba(34, 211, 238, 0.15);
  }
}

/* ---------- marks ---------- */
.mark {
  width: 58%;
  height: 58%;
  animation: mark-pop 150ms ease-out;
}

@keyframes mark-pop {
  0% { transform: scale(0.3); opacity: 0; }
  60% { transform: scale(1.12); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

.mark-x {
  filter: drop-shadow(0 0 7px rgba(34, 211, 238, 0.65));
}

.mark-o {
  filter: drop-shadow(0 0 7px rgba(244, 114, 182, 0.65));
}

.mark line {
  stroke: var(--cyan);
  stroke-width: 9;
  stroke-linecap: round;
}

.mark circle {
  fill: none;
  stroke: var(--pink);
  stroke-width: 9;
}

/* ---------- win line ---------- */
.win-line {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
  z-index: 5;
}

#win-line-el {
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.45));
}

/* ---------- buttons ---------- */
.buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 300px;
}

.btn {
  border: none;
  border-radius: 27px;
  height: 54px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 100ms ease, filter 150ms ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn.primary {
  background: linear-gradient(90deg, var(--cyan), var(--pink));
  color: #0d1025;
  box-shadow: 0 6px 24px rgba(34, 211, 238, 0.25);
}

.btn.primary:hover {
  filter: brightness(1.1);
}

.btn.ghost {
  height: 48px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.7);
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.09);
}

/* ---------- overlay ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13, 15, 36, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
  padding: 24px;
}

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

.modal {
  width: 100%;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  padding: 34px 28px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  transform: scale(0.85);
  transition: transform 250ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.overlay.show .modal {
  transform: scale(1);
}

.modal-title {
  font-size: 24px;
  font-weight: 800;
}

.modal .btn {
  width: 100%;
}

/* ---------- confetti ---------- */
#confetti-layer {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 100;
}

.confetti {
  position: absolute;
  top: -24px;
  border-radius: 2px;
  animation-name: confetti-fall;
  animation-timing-function: linear;
  animation-fill-mode: forwards;
}

@keyframes confetti-fall {
  from {
    transform: translate3d(0, 0, 0) rotate(0deg);
    opacity: 1;
  }
  to {
    transform: translate3d(var(--drift), 108vh, 0) rotate(var(--spin));
    opacity: 0.85;
  }
}

/* ---------- toast ---------- */
.toast {
  position: fixed;
  bottom: calc(24px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  z-index: 90;
  padding: 10px 20px;
  font-size: 14px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}