:root {
  --bg-0: #1a0b04;
  --bg-1: #2a1108;
  --ember-50: #fff4ec;
  --ember-100: #ffe3cc;
  --ember-200: #ffc89a;
  --ember-300: #ffa766;
  --ember-400: #ff8a3d;
  --ember-500: #ff6a13;
  --ember-600: #e0540a;
  --ember-700: #a83d08;
  --ember-800: #6f2705;
  --ink: #fff1e2;
  --ink-dim: #f4c9a3;
  --line: rgba(255, 138, 61, 0.22);
  --glass: rgba(255, 138, 61, 0.06);
  --glass-strong: rgba(255, 138, 61, 0.12);
  --shadow-ember: 0 12px 40px -10px rgba(255, 106, 19, 0.45),
                  0 2px 6px rgba(0, 0, 0, 0.35);
  --x-color: #ffb066;
  --o-color: #ffd9a8;
  font-family: ui-sans-serif, system-ui, -apple-system, "SF Pro Text", "Inter", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  color: var(--ink);
  background:
    radial-gradient(120% 80% at 50% -10%, #3a1808 0%, transparent 60%),
    radial-gradient(80% 60% at 10% 110%, #4a1c08 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  overflow-x: hidden;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 48px);
  min-height: 100dvh;
}

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  mix-blend-mode: screen;
  animation: drift 18s ease-in-out infinite;
}
.glow-1 { width: 520px; height: 520px; background: #ff6a13; top: -120px; left: -120px; }
.glow-2 { width: 420px; height: 420px; background: #ff3b00; bottom: -100px; right: -80px; animation-delay: -6s; }
.glow-3 { width: 320px; height: 320px; background: #ffae5e; top: 40%; left: 50%; transform: translate(-50%, -50%); animation-delay: -12s; opacity: 0.35; }

@keyframes drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(30px, -20px) scale(1.06); }
}
.glow-2 { animation-name: drift2; }
@keyframes drift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(-40px, 30px) scale(1.08); }
}

.app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.4vw, 22px);
}

.header {
  text-align: center;
  margin-bottom: 4px;
}
.title {
  margin: 0;
  font-size: clamp(2rem, 6vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffd9a8 0%, var(--ember-400) 60%, var(--ember-600) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 1px 0 rgba(0,0,0,0.15);
}
.dot { color: var(--ember-500); -webkit-text-fill-color: var(--ember-500); }
.subtitle {
  margin: 6px 0 0;
  color: var(--ink-dim);
  font-size: 0.92rem;
  opacity: 0.85;
}

.panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 14px;
  backdrop-filter: blur(6px);
  flex-wrap: wrap;
}

.control-group {
  display: inline-flex;
  gap: 4px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 10px;
  padding: 4px;
}

.chip, .chip-sm {
  border: 0;
  background: transparent;
  color: var(--ink-dim);
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, transform 120ms ease;
  font-family: inherit;
}
.chip-sm { padding: 6px 10px; font-size: 0.78rem; }

.chip:hover, .chip-sm:hover { color: var(--ink); }
.chip:active, .chip-sm:active { transform: scale(0.97); }

.chip.active, .chip-sm.active {
  background: linear-gradient(180deg, var(--ember-400), var(--ember-600));
  color: #1a0a04;
  box-shadow: 0 4px 14px -4px rgba(255, 106, 19, 0.6);
}

.difficulty[data-hidden="true"] {
  opacity: 0.3;
  pointer-events: none;
  filter: grayscale(0.4);
}

.scoreboard {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}
.score {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: border-color 200ms ease, background 200ms ease, transform 200ms ease;
}
.score.active {
  border-color: var(--ember-400);
  background: rgba(255, 138, 61, 0.13);
  transform: translateY(-1px);
}
.score-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.score-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ember-200);
}

.board-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.status {
  text-align: center;
  color: var(--ink-dim);
  font-weight: 600;
  font-size: 0.95rem;
  min-height: 1.4em;
  letter-spacing: 0.01em;
}
.status .win { color: var(--ember-300); }

.board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 12px;
  background: linear-gradient(180deg, rgba(255,138,61,0.10), rgba(255,138,61,0.04));
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow-ember), inset 0 1px 0 rgba(255, 200, 154, 0.06);
  aspect-ratio: 1 / 1;
}

.cell {
  position: relative;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  border-radius: 14px;
  font-family: inherit;
  font-size: clamp(2.4rem, 12vw, 4rem);
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  transition:
    transform 120ms ease,
    background 180ms ease,
    border-color 180ms ease,
    box-shadow 220ms ease;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

.cell::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(60% 60% at 50% 50%, rgba(255, 138, 61, 0.18), transparent 70%);
  opacity: 0;
  transition: opacity 180ms ease;
}
.cell:not(:disabled):hover::before { opacity: 1; }
.cell:not(:disabled):hover {
  border-color: rgba(255, 138, 61, 0.55);
  transform: translateY(-1px);
}
.cell:focus-visible {
  outline: 2px solid var(--ember-400);
  outline-offset: 2px;
}
.cell:active:not(:disabled) { transform: scale(0.97); }

.cell .mark {
  display: inline-block;
  animation: pop 220ms cubic-bezier(0.2, 0.9, 0.3, 1.4);
  line-height: 1;
}
.cell[data-mark="x"] .mark { color: var(--x-color); text-shadow: 0 0 22px rgba(255, 138, 61, 0.55); }
.cell[data-mark="o"] .mark { color: var(--o-color); text-shadow: 0 0 22px rgba(255, 200, 154, 0.45); }

.cell.win {
  background: rgba(255, 138, 61, 0.18);
  border-color: var(--ember-400);
  box-shadow: 0 0 0 1px var(--ember-400) inset, 0 8px 30px -8px rgba(255, 106, 19, 0.7);
}

@keyframes pop {
  0%   { transform: scale(0.4); opacity: 0; }
  60%  { transform: scale(1.08); opacity: 1; }
  100% { transform: scale(1); }
}

.strike {
  position: absolute;
  inset: 12px;
  width: calc(100% - 24px);
  height: calc(100% - 24px);
  pointer-events: none;
}
.strike line {
  stroke: var(--ember-400);
  stroke-width: 3;
  stroke-linecap: round;
  filter: drop-shadow(0 0 6px rgba(255, 138, 61, 0.7));
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  transition: stroke-dashoffset 420ms cubic-bezier(0.4, 0.0, 0.2, 1);
  vector-effect: non-scaling-stroke;
}
.strike.show line { stroke-dashoffset: 0; }

.actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.btn {
  border: 0;
  border-radius: 12px;
  padding: 11px 18px;
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  font-family: inherit;
  transition: transform 120ms ease, background 180ms ease, box-shadow 180ms ease, color 180ms ease;
}
.btn.primary {
  background: linear-gradient(180deg, var(--ember-400), var(--ember-600));
  color: #1a0a04;
  box-shadow: 0 8px 22px -8px rgba(255, 106, 19, 0.7);
}
.btn.primary:hover { transform: translateY(-1px); box-shadow: 0 12px 30px -10px rgba(255, 106, 19, 0.85); }
.btn.primary:active { transform: scale(0.97); }
.btn.ghost {
  background: transparent;
  color: var(--ink-dim);
  border: 1px solid var(--line);
}
.btn.ghost:hover { color: var(--ink); border-color: var(--ember-400); }
.btn.ghost:active { transform: scale(0.97); }

.footer {
  text-align: center;
  color: var(--ink-dim);
  font-size: 0.78rem;
  opacity: 0.55;
}

@media (max-width: 380px) {
  .panel { flex-direction: column; align-items: stretch; }
  .control-group { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}