/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Variables ── */
:root {
  --bg:       #070e1b;
  --surface:  #0e1a2e;
  --surface2: #152236;
  --text:     #e8edf5;
  --muted:    #8892aa;
  --accent:   #7c6af7;
  --border:   rgba(255,255,255,0.07);
  --match:    #22c55e;
}

/* ── Base ── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  width: 100%;
}

.back-btn {
  color: var(--muted);
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}
.back-btn svg { width: 22px; height: 22px; }

.logo {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.logo span { color: var(--accent); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.header-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  line-height: 1;
  transition: background 0.15s;
}
.header-btn:active { background: var(--accent); }

.header-btn--icon {
  width: 34px;
  height: 34px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 700;
}

/* ── Main ── */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 16px 16px 20px;
}

/* ── Stats bar ── */
#stats {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 10px 20px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.stat-val {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  min-width: 3ch;
  text-align: center;
}

.stat-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

/* ── Size picker ── */
#size-picker {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 4px;
}

.size-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  padding: 6px 16px;
  border-radius: 18px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.size-btn.active {
  background: var(--accent);
  color: #fff;
}

.size-btn:not(.active):hover {
  color: var(--text);
}

/* ── Theme picker ── */
#theme-picker {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 4px;
}

.theme-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  width: 36px;
  height: 32px;
  border-radius: 18px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.5;
}

.theme-btn.active {
  background: var(--accent);
  opacity: 1;
  transform: scale(1.08);
}

.theme-btn:not(.active):hover {
  opacity: 0.85;
}

/* ── Streak float ── */
.streak-float {
  position: fixed;
  top: 30%;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: rgba(251,191,36,0.15);
  color: #fbbf24;
  border: 1px solid rgba(251,191,36,0.35);
  border-radius: 99px;
  padding: 8px 20px;
  font-size: 1rem;
  font-weight: 800;
  pointer-events: none;
  opacity: 0;
  z-index: 50;
  white-space: nowrap;
}

@keyframes streakPop {
  0%   { opacity: 0; transform: translateX(-50%) translateY(8px) scale(0.85); }
  20%  { opacity: 1; transform: translateX(-50%) translateY(0)   scale(1.06); }
  70%  { opacity: 1; transform: translateX(-50%) translateY(0)   scale(1);    }
  100% { opacity: 0; transform: translateX(-50%) translateY(-12px) scale(0.95); }
}

.streak-float--show {
  animation: streakPop 1.4s ease forwards;
}

/* ── Grid ── */
#grid {
  --cols: 4;
  --rows: 4;
  --gap: 10px;
  /* Maks cellestørrelse begrenset av bredde */
  --cell-by-w: calc((min(380px, 100vw - 32px) - (var(--cols) - 1) * var(--gap)) / var(--cols));
  /* Maks cellestørrelse begrenset av høyde (220px = header + stats + picker + padding) */
  --cell-by-h: calc((100dvh - 264px - (var(--rows) - 1) * var(--gap)) / var(--rows));
  --cell-size: min(var(--cell-by-w), var(--cell-by-h));
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--cell-size));
  gap: var(--gap);
}

#grid[data-size="medium"] { --gap: 9px; }
#grid[data-size="large"]  { --gap: 7px; }

/* ── Cards ── */
.card {
  aspect-ratio: 1;
  position: relative;
  cursor: pointer;
  perspective: 900px;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.38s cubic-bezier(0.4, 0, 0.2, 1);
}

.card.flipped .card-inner,
.card.matched .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#grid[data-size="large"] .card-face { border-radius: 10px; }

/* Face down */
.card-front {
  background: var(--surface2);
  border: 2px solid rgba(124,106,247,0.22);
  transition: border-color 0.2s;
}
.card:hover:not(.matched) .card-front {
  border-color: rgba(124,106,247,0.5);
}

.card-front-mark {
  font-size: 1.3rem;
  color: var(--accent);
  opacity: 0.22;
  pointer-events: none;
}

#grid[data-size="large"] .card-front-mark { font-size: 1rem; }

/* Face up */
.card-back {
  background: var(--surface);
  border: 2px solid var(--accent);
  transform: rotateY(180deg);
  font-size: clamp(1.8rem, 6vw, 2.2rem);
}

#grid[data-size="medium"] .card-back { font-size: clamp(1.5rem, 5vw, 1.9rem); }
#grid[data-size="large"]  .card-back { font-size: clamp(1.2rem, 4vw, 1.6rem); }

/* Matched */
.card.matched .card-back {
  border-color: var(--match);
  background: rgba(34,197,94,0.07);
}

/* Match bounce (fires after flip completes) */
@keyframes matchBounce {
  0%   { transform: rotateY(180deg) scale(1); }
  50%  { transform: rotateY(180deg) scale(1.14); }
  100% { transform: rotateY(180deg) scale(1); }
}
.card.matched .card-inner {
  animation: matchBounce 0.28s ease 0.36s both;
}

/* ── Overlays ── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(7,14,27,0.82);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
}
.overlay[hidden] { display: none; }

.overlay-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 24px;
  padding: 32px 24px;
  width: 100%;
  max-width: 340px;
  text-align: center;
  position: relative;
}

.overlay-emoji { font-size: 3rem; margin-bottom: 12px; line-height: 1; }

.overlay-card h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 20px;
}

/* Win stats */
.win-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

.win-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.win-stat-val {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}

.win-stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.win-stat-sep {
  font-size: 1.5rem;
  color: var(--border);
  align-self: center;
  margin-top: -8px;
}

.win-record {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fbbf24;
  margin-bottom: 4px;
  min-height: 1.4em;
}

.btn-primary {
  display: block;
  width: 100%;
  padding: 16px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  margin-top: 20px;
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.9; }

.btn-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--surface2);
  border: none;
  color: var(--muted);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Info modal ── */
.overlay-card--info {
  text-align: left;
  padding-top: 44px;
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
}
.overlay-card--info h2 {
  text-align: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
}

.info-section {
  display: flex;
  flex-direction: column;
}

.info-section > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.info-section > div:last-child { border-bottom: none; }

.info-icon { font-size: 1.4rem; }

.info-section > div > strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  margin-top: 2px;
}

.info-section p {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}
.info-section p strong { display: inline; font-weight: 700; color: var(--text); }