/* ---------- Variables ---------- */
:root {
  --bg: #0a0f1e;
  --panel: rgba(255, 255, 255, 0.06);
  --edge: rgba(255, 255, 255, 0.10);
  --ink: #e6edf7;
  --dim: #8fa1ba;
  --cyan: #22d3ee;
  --violet: #a78bfa;
  --radius: 16px;
  --font: "Space Grotesk", system-ui, sans-serif;
}

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { height: 100%; }
body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  overflow-x: hidden;
}
button { font-family: inherit; color: inherit; touch-action: manipulation; }

/* ---------- App layout ---------- */
#app { position: relative; }
.screen { display: none; min-height: 100dvh; }
.screen.active { display: flex; flex-direction: column; align-items: center; }
.hidden { display: none !important; }

/* ---------- Menu (only PLAY) ---------- */
.menu-wrap {
  margin: auto;
  padding: 40px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.play-btn {
  padding: 20px 56px;
  border: none;
  border-radius: 999px;
  background: #6d5ae0;
  color: #fff;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  cursor: pointer;
}
.play-btn:hover { filter: brightness(1.08); }
.play-btn:active { transform: scale(0.98); }

/* ---------- HUD (time | level | sound + restart) ---------- */
#screen-game { padding: 12px clamp(10px, 3vw, 20px) 16px; gap: 10px; }

#hud {
  width: min(100%, 1040px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
}

.hud-left,
.hud-center,
.hud-right { display: flex; align-items: center; gap: 14px; }
.hud-center { flex: 1; justify-content: center; }

.stat { display: flex; flex-direction: column; align-items: center; line-height: 1.1; min-width: 52px; }
.stat-value { font-size: 1.2rem; font-weight: 700; }
.mono { font-variant-numeric: tabular-nums; }
.stat-label { font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.18em; color: var(--dim); }
.hud-level { font-size: 1.2rem; font-weight: 700; }

.hole { pointer-events: none; }

/* Icon buttons (sound + restart) */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--edge);
  background: var(--panel);
  cursor: pointer;
}
.icon-btn svg { width: 20px; height: 20px; }

.restart-btn {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  cursor: pointer;
}
.restart-btn svg { width: 20px; height: 20px; }

/* ---------- Board & cards ---------- */
.board {
  display: grid;
  grid-template-columns: repeat(var(--cols, 4), var(--card, 110px));
  gap: var(--gap, 12px);
  justify-content: center;
  align-content: center;
  margin: auto;
  padding: 8px 0;
}

.card {
  width: var(--card, 110px);
  aspect-ratio: 3 / 4;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  perspective: 900px;
  user-select: none;
}
.card.matched { cursor: default; }

/* Deal-in animation */
.card.deal { opacity: 0; transform: translateY(16px) scale(0.95); }
.card.in { opacity: 1; transform: none; transition: opacity 0.35s, transform 0.35s; }

/* Flip */
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s;
}
.card.flipped .card-inner,
.card.matched .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 12px;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.card-back { background: #141c30; border: 1px solid rgba(148, 163, 199, 0.22); }
.card-back::after {
  content: "";
  width: 30%;
  aspect-ratio: 1;
  transform: rotate(45deg);
  border-radius: 4px;
  border: 2px solid rgba(103, 232, 249, 0.3);
}
.card-front {
  transform: rotateY(180deg);
  background: #151d33;
  border: 1px solid hsla(var(--h), 85%, 65%, 0.5);
}
.card-front svg { width: 56%; height: 56%; color: hsl(var(--h), 92%, 68%); }

/* Matched + mismatch feedback */
.card.matched { opacity: 0.7; }
.card.shake .card-inner { animation: shake 0.4s; }
@keyframes shake {
  20% { transform: rotateY(180deg) translateX(-6px); }
  40% { transform: rotateY(180deg) translateX(6px); }
  60% { transform: rotateY(180deg) translateX(-4px); }
  80% { transform: rotateY(180deg) translateX(4px); }
}

/* ---------- Results ---------- */
.panel {
  margin: auto;
  width: min(92vw, 440px);
  padding: 32px 28px;
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 20px;
}
.result-panel h2 { letter-spacing: 0.18em; font-size: 1.3rem; }
.breakdown { display: flex; flex-direction: column; gap: 8px; margin: 20px 0; }
.bd-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.9rem;
  opacity: 0;
  transform: translateY(6px);
  transition: 0.3s;
}
.bd-row.show { opacity: 1; transform: none; }
.bd-row dt { color: var(--dim); }
.row-btns { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid var(--edge);
  background: var(--panel);
  font-weight: 600;
  cursor: pointer;
}
.btn.primary { background: #6d5ae0; border-color: transparent; color: #fff; }
.btn.ghost { color: var(--dim); }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  #hud { padding: 8px 10px; gap: 8px; }
  .stat { min-width: 40px; }
  .stat-value { font-size: 1rem; }
  .panel { padding: 24px 18px; }
}