/* ═══════════════════════════════════════════════════
   Game intro overlay — cinematic card sweep + LEVEL N
═══════════════════════════════════════════════════ */
#intro-overlay {
  position: fixed; inset: 0; z-index: 500;
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
  background: var(--black);
  opacity: 0;
  perspective: 1200px;
}
#intro-overlay.running { opacity: 1; pointer-events: all; }
#intro-overlay.fading  { opacity: 0; transition: opacity 0.4s ease; }

.intro-stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.intro-card {
  position: absolute;
  width: clamp(70px, 18vw, 130px);
  aspect-ratio: 1 / 1;
  background: var(--black);
  border: 4px solid var(--white);
  border-radius: 4px;
  opacity: 0;
  will-change: transform, opacity;
  transform: translate3d(var(--sx, 0), var(--sy, 0), 0) rotate(var(--sr, 0deg)) scale(0.3);
  animation: introCardFly 2.0s var(--delay, 0ms) cubic-bezier(0.2, 0.85, 0.25, 1) forwards;
  display: flex;
  align-items: center;
  justify-content: center;
}

.intro-card svg {
  width: 56%;
  height: 56%;
}

.intro-card svg,
.intro-card svg * {
  fill: var(--yellow) !important;
}

@keyframes introCardFly {
  0%   { transform: translate3d(var(--sx), var(--sy), 0) rotate(var(--sr)) scale(0.3); opacity: 0; }
  18%  { opacity: 1; }
  35%  { transform: translate3d(0, 0, 0) rotate(var(--mr, 0deg)) scale(1.05); opacity: 1; }
  42%  { transform: translate3d(0, 0, 0) rotate(var(--mr, 0deg)) scale(0.96); }
  50%  { transform: translate3d(0, 0, 0) rotate(var(--mr, 0deg)) scale(1);    opacity: 1; }
  72%  { transform: translate3d(0, 0, 0) rotate(var(--mr, 0deg)) scale(1);    opacity: 1; }
  100% { transform: translate3d(var(--ex, 0), var(--ey, 0), 0) rotate(var(--er, 0deg)) scale(0.4); opacity: 0; }
}

.intro-badge {
  position: absolute;
  left: 50%; top: 50%;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: clamp(40px, 11vw, 96px);
  letter-spacing: -0.03em;
  color: var(--white);
  background: var(--black);
  border-radius: 4px;
  padding: 0.18em 0.4em;
  white-space: nowrap;
  line-height: 1;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.6);
  will-change: transform, opacity, letter-spacing;
  z-index: 9999;
}

#intro-overlay.running .intro-badge {
  animation: introBadgeIn 0.9s 0.85s cubic-bezier(0.2, 1.2, 0.3, 1) forwards;
}

@keyframes introBadgeIn {
  0%   { transform: translate(-50%, -50%) scale(0.55); opacity: 0; letter-spacing: 0.04em; }
  55%  { transform: translate(-50%, -50%) scale(1.04); opacity: 1; letter-spacing: -0.05em; }
  100% { transform: translate(-50%, -50%) scale(1);    opacity: 1; letter-spacing: -0.03em; }
}

#intro-overlay.fading .intro-badge {
  animation: introBadgeOut 0.35s ease forwards;
}

@keyframes introBadgeOut {
  to { transform: translate(-50%, -50%) scale(1.1); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .intro-card { animation: none; opacity: 0; }
  #intro-overlay.running .intro-badge {
    animation: none;
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

/* ═══════════════════════════════════════════════════
   Game screen
═══════════════════════════════════════════════════ */
#game {
  background: var(--black);
  padding: 0;
  padding-top: 19.6vh;
  gap: clamp(10px, 2vw, 18px);
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

/* ── Top HUD: LEVEL N | TIME: 25 (sits just above the grid) ── */
.game-top {
  width: min(86%, 560px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: clamp(18px, 5.2vw, 30px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.game-level,
.game-time { line-height: 1; }
.game-time #score { font-variant-numeric: tabular-nums; }
.game-time.danger { color: #FF3B30; }

/* ── Grid ── */
.game-grid {
  display: grid;
  gap: clamp(8px, 2.2vw, 16px);
  width: min(86%, 560px);
}

/* ── Card ── */
.gcard {
  width: 100%;
  aspect-ratio: 1 / 1;
  perspective: 1000px;
  cursor: pointer;
  position: relative;
  will-change: transform;
}
.gcard.matched  { cursor: default; }
.gcard.disabled { cursor: default; pointer-events: none; }

.gcard-inner {
  width: 100%; height: 100%;
  position: relative;
  transform-style: preserve-3d;
  border-radius: 4px;
  will-change: transform;
  transform: rotateY(0deg);
  transition: transform 0.38s cubic-bezier(0.4, 0, 0.2, 1);
}
.gcard-inner.flipped { transform: rotateY(180deg); }

.gcard-front,
.gcard-back {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  background: var(--black);
  border: 4px solid var(--white);
  box-sizing: border-box;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.gcard-back {
  transform: rotateY(180deg);
}

.gcard-back svg { width: 52%; height: 52%; }

/* Force icons yellow (icons already use #EEFF41 but defensive) */
.gcard-back svg,
.gcard-back svg * { fill: var(--yellow) !important; }

/* ── Matched: yellow border ── */
.gcard.matched .gcard-back {
  border-color: var(--yellow);
}
.gcard.matched .gcard-front {
  border-color: var(--yellow);
}
.gcard.matched .gcard-inner {
  animation: gcardMatch 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
@keyframes gcardMatch {
  0%   { transform: rotateY(180deg) scale(1); }
  45%  { transform: rotateY(180deg) scale(1.06); }
  100% { transform: rotateY(180deg) scale(1); }
}

/* ── Wrong: brief red border flash ── */
.gcard.wrong .gcard-back { animation: gcardWrong 0.5s ease; }
@keyframes gcardWrong {
  0%, 100% { border-color: var(--white); }
  35%, 65% { border-color: #FF3B30; }
}

/* Particle canvas per card (kept for match burst) */
.gcard-particles {
  position: absolute; inset: -22px;
  pointer-events: none; z-index: 10;
  width: calc(100% + 44px); height: calc(100% + 44px);
}

/* ── Bottom logo ── */
.game-brand {
  position: absolute;
  left: 50%;
  bottom: clamp(70px, 11vh, 130px);
  transform: translateX(-50%);
  width: clamp(110px, 28vw, 180px);
  height: auto;
  display: block;
  user-select: none;
  pointer-events: none;
}

/* ═══════════════════════════════════════════════════
   Kiosk 1080×1920
═══════════════════════════════════════════════════ */
@media (orientation: portrait) and (min-width: 1000px) and (min-height: 1700px) {
  /* Lift the play area to "chest" height for standing kiosk users */
  #game {
    justify-content: flex-start;
    padding-top: 377px;
    gap: clamp(20px, 2vw, 32px);
  }
  .intro-badge { font-size: clamp(120px, 11vw, 180px); }
  .game-top    { width: calc(100% - 120px); font-size: clamp(38px, 3.6vw, 56px); }
  .game-grid   { width: calc(100% - 120px); gap: 22px; }
  .gcard-front, .gcard-back { border-radius: 6px; border-width: 6px; }
  .gcard-inner { border-radius: 6px; }
  .gcard-back svg { width: 56%; height: 56%; }
  .game-brand  { width: clamp(220px, 22vw, 320px); bottom: 221px; }
}