:root {
  --ink: 17 17 19;
  --paper: 255 250 240;
  --bg: 255 209 92;
  --x-color: 255 76 96;
  --o-color: 47 111 237;
  --win: 39 191 118;

  --border-w: 4px;
  --shadow-off: 6px;
  --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
  min-height: 100vh;
  background: rgb(var(--bg));
  background-image: radial-gradient(rgb(0 0 0 / 0.08) 1.5px, transparent 1.5px);
  background-size: 22px 22px;
  color: rgb(var(--ink));
  font-family: 'Space Grotesk', system-ui, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem;
}

.stage {
  width: 100%;
  max-width: 440px;
  text-align: center;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
  opacity: 0.7;
}

h1 {
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 1.5rem;
}

.amp {
  color: rgb(var(--paper));
  -webkit-text-stroke: 2px rgb(var(--ink));
}

.panel {
  background: rgb(var(--paper));
  border: var(--border-w) solid rgb(var(--ink));
  border-radius: 20px;
  box-shadow: var(--shadow-off) var(--shadow-off) 0 rgb(var(--ink));
  padding: 1.25rem;
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.9rem;
}

.turn-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2.5px solid rgb(var(--ink));
  background: rgb(var(--x-color));
  transition: background-color 200ms ease;
}

.turn-dot--o {
  background: rgb(var(--o-color));
}

.reset-btn {
  padding: 0.45rem 0.9rem;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  color: rgb(var(--ink));
  background: rgb(var(--paper));
  border: 2.5px solid rgb(var(--ink));
  border-radius: 10px;
  box-shadow: 3px 3px 0 rgb(var(--ink));
  cursor: pointer;
  transition: all 120ms var(--ease-out-quad);
}

.reset-btn:hover {
  background: rgb(var(--bg));
}

.reset-btn:active {
  transform: translate(3px, 3px);
  box-shadow: 0 0 0 rgb(var(--ink));
}

.board-wrap {
  position: relative;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.cell {
  aspect-ratio: 1;
  background: rgb(var(--paper));
  border: var(--border-w) solid rgb(var(--ink));
  border-radius: 14px;
  box-shadow: 4px 4px 0 rgb(var(--ink));
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: transform 100ms var(--ease-out-quad), box-shadow 100ms var(--ease-out-quad);
}

@media (hover: hover) and (pointer: fine) {
  .cell:not(:disabled):hover {
    background: rgb(0 0 0 / 0.04);
  }
}

.cell:not(:disabled):active {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 rgb(var(--ink));
}

.cell:disabled {
  cursor: default;
}

.cell svg {
  width: 52%;
  height: 52%;
  overflow: visible;
}

.cell .mark-path {
  fill: none;
  stroke-width: 9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.cell.is-x .mark-path {
  stroke: rgb(var(--x-color));
}

.cell.is-o .mark-path {
  stroke: rgb(var(--o-color));
}

.cell.is-win {
  background: rgb(var(--win) / 0.18);
}

/* Cada trazo del marcador se dibuja con stroke-dashoffset (no scale-in): un
   sello no aparece de la nada, se traza — coherente con el resto de la marca. */
.mark-path {
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  animation: draw-mark 260ms var(--ease-out-quad) forwards;
}

@keyframes draw-mark {
  to {
    stroke-dashoffset: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mark-path {
    animation-duration: 1ms;
  }
}

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

.win-line line {
  stroke: rgb(var(--ink));
  stroke-width: 0.1;
  stroke-linecap: round;
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  opacity: 0;
}

.win-line.is-drawn line {
  opacity: 1;
  animation: draw-line 380ms var(--ease-out-quad) forwards;
}

@keyframes draw-line {
  to {
    stroke-dashoffset: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .win-line.is-drawn line {
    animation-duration: 1ms;
  }
}

.hint {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  opacity: 0.65;
}