/* Memory — Pairs */

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.page-head h1 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 40px);
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.05;
}
.page-head .sub {
  color: var(--ink-soft);
  margin: 6px 0 0;
  font-size: 14px;
  min-height: 1.4em;
}
.head-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.play {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

/* Difficulty selector */
.diff-group {
  display: inline-flex;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
  gap: 2px;
  box-shadow: var(--shadow);
}
.diff-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: 600 13px 'Inter', sans-serif;
  padding: 7px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}
.diff-btn:hover { background: var(--accent-soft); color: var(--ink); }
.diff-btn[aria-pressed="true"] {
  background: var(--accent);
  color: var(--paper);
}

/* Stats row */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  padding: 4px 4px 16px;
  border-bottom: 1px dashed var(--line);
  margin-bottom: 16px;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 64px;
}
.stat-label {
  font: 600 10.5px 'Inter', sans-serif;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.stat-value {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: 22px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

/* Board */
.board-wrap {
  display: flex;
  justify-content: center;
}
.board {
  display: grid;
  gap: clamp(6px, 1.2vw, 12px);
  width: 100%;
  /* cols/rows set via inline styles by JS */
}

/* Card with 3D flip */
.card {
  position: relative;
  aspect-ratio: 3 / 4;
  perspective: 800px;
  cursor: pointer;
  background: transparent;
  border: 0;
  padding: 0;
  font: inherit;
}
.card:disabled { cursor: default; }
.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 260ms cubic-bezier(0.4, 0.0, 0.2, 1);
  border-radius: 10px;
}
.card.is-revealed .card-inner,
.card.is-matched .card-inner {
  transform: rotateY(180deg);
}
.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 10px;
  user-select: none;
}

/* Card back — navy diagonal stripes, matching Solitaire face-down */
.card-back {
  background:
    repeating-linear-gradient(45deg,
      #1f3a5f 0,
      #1f3a5f 6px,
      #2d5a8c 6px,
      #2d5a8c 12px);
  box-shadow:
    inset 0 0 0 3px var(--paper),
    inset 0 0 0 4.5px #14253d,
    0 1px 0 rgba(0,0,0,0.05),
    0 4px 10px -6px rgba(31,58,95,0.4);
}

/* Card front — paper with glyph */
.card-front {
  transform: rotateY(180deg);
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--accent);
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: clamp(28px, 6vw, 56px);
  line-height: 1;
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.5),
    0 1px 0 rgba(0,0,0,0.05),
    0 4px 10px -6px rgba(31,58,95,0.35);
}

/* Hover lift on face-down only */
.card:not(.is-revealed):not(.is-matched):not(:disabled):hover .card-inner {
  transform: translateY(-2px);
}
.card:not(.is-revealed):not(.is-matched):not(:disabled):hover.is-revealed .card-inner,
.card:not(.is-revealed):not(.is-matched):not(:disabled):hover.is-matched .card-inner {
  transform: rotateY(180deg) translateY(-2px);
}

/* Matched cards fade slightly to read as resolved */
.card.is-matched .card-front {
  background: var(--accent-soft);
  border-color: var(--accent-soft);
  color: var(--accent);
}
.card.is-matched {
  cursor: default;
}

/* Just-matched — both cards flash gold together */
@keyframes mem-match-flash {
  0%   { box-shadow: 0 0 0 0 rgba(213, 192, 125, 0); }
  40%  { box-shadow: 0 0 0 6px rgba(213, 192, 125, 0.6); }
  100% { box-shadow: 0 0 0 0 rgba(213, 192, 125, 0); }
}
.card.just-matched .card-front {
  animation: mem-match-flash 620ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
  .card-inner, .card.just-matched .card-front { animation: none; transition: none; }
}

/* Focus ring (keyboard) */
.card:focus-visible {
  outline: none;
}
.card:focus-visible .card-inner {
  box-shadow: 0 0 0 3px var(--accent-2);
  border-radius: 12px;
}

/* Aside info */
.aside-info { margin-top: 22px; }
.aside-info details {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 16px;
  box-shadow: var(--shadow);
}
.aside-info summary {
  cursor: pointer;
  font: 700 14px 'Inter', sans-serif;
  color: var(--ink);
}
.aside-info .help-body {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.55;
}
.aside-info .help-body p { margin: 0 0 8px; }
.aside-info .help-body ul { margin: 0; padding-left: 18px; }
.aside-info .help-body li { margin: 4px 0; }

/* Win overlay */
.win-overlay {
  position: fixed; inset: 0; background: rgba(28, 42, 58, 0.55);
  display: flex; align-items: center; justify-content: center; z-index: 50; padding: 20px;
}
.win-overlay[hidden] { display: none; }
.win-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 30px; text-align: center; box-shadow: var(--shadow-lift); max-width: 360px;
}
.win-card h2 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: 30px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.win-line {
  margin: 0 0 4px;
  color: var(--ink-soft);
  font-size: 15px;
}
.win-best {
  margin: 6px 0 18px;
  color: var(--success);
  font: 600 13px 'Inter', sans-serif;
  letter-spacing: 0.04em;
  min-height: 1em;
}
.win-best:empty { margin-bottom: 14px; }
.win-actions { display: flex; justify-content: center; gap: 8px; }

/* Responsive */
@media (max-width: 520px) {
  .stats { gap: 12px 20px; }
  .stat-value { font-size: 19px; }
  .card-front { font-size: clamp(22px, 9vw, 40px); }
  .head-actions { width: 100%; }
  .diff-group { flex: 1; justify-content: space-between; }
  .diff-btn { flex: 1; padding: 7px 6px; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .card-inner { transition-duration: 0ms; }
}