:root {
  --ink: #1a2430;
  --cream: #f7f1e4;
  --tile-back: #c44536;
  --tile-back-deep: #8f2a22;
  --tile-edge: #f0d78c;
  --panel: rgba(18, 28, 38, 0.78);
  --accent: #e8b84a;
  --ok: #3d9a6a;
  --font-display: "Segoe UI", "Trebuchet MS", sans-serif;
  --font-body: "Segoe UI", "Trebuchet MS", sans-serif;
  --radius: 14px;
  --flip-ms: 420ms;
  --mismatch-ms: 780ms;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body.memory-page {
  font-family: var(--font-body);
  color: var(--cream);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, #3a5f7a 0%, transparent 55%),
    linear-gradient(160deg, #0e1822 0%, #1c3344 45%, #0f1a24 100%);
}

.memory-back-link {
  position: fixed;
  top: 0.75rem;
  left: 0.85rem;
  z-index: 30;
  color: var(--cream);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid rgba(240, 215, 140, 0.35);
}

.memory-back-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- Main menu shell ---- */
.menu-shell {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 2.75rem 1rem 2rem;
  position: relative;
}

.menu-stage {
  position: relative;
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(240, 215, 140, 0.2);
  min-height: min(72vh, 640px);
}

.menu-stage-map {
  display: block;
  width: 100%;
  height: 100%;
  min-height: min(72vh, 640px);
  object-fit: cover;
  vertical-align: top;
  pointer-events: none;
  user-select: none;
  transition: opacity 0.45s ease;
}

.menu-stage-map.is-fading,
.stage-map.is-fading {
  opacity: 0.15;
}

.menu-stage-dim {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(8, 14, 20, 0.35) 0%,
    rgba(8, 14, 20, 0.55) 45%,
    rgba(8, 14, 20, 0.72) 100%
  );
  pointer-events: none;
}

.menu-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1.25rem 2rem;
  text-align: center;
  z-index: 2;
}

.menu-panel[hidden] {
  display: none;
}

.menu-eyebrow {
  margin: 0 0 0.2rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.menu-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  letter-spacing: 0.02em;
  line-height: 1.05;
  color: var(--cream);
  text-shadow: 0 3px 16px rgba(0, 0, 0, 0.55);
}

.menu-tagline {
  margin: 0.5rem 0 1.25rem;
  max-width: 28ch;
  color: rgba(247, 241, 228, 0.88);
  font-size: 1rem;
}

.menu-panel-title {
  margin: 0 0 1rem;
  font-size: 1.5rem;
  color: var(--cream);
}

.menu-best {
  margin-bottom: 1.25rem;
  padding: 0.75rem 1.1rem;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid rgba(240, 215, 140, 0.35);
  min-width: min(280px, 100%);
}

.menu-best-label {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.menu-best-row {
  margin: 0.15rem 0;
  font-size: 0.92rem;
  color: rgba(247, 241, 228, 0.85);
}

.menu-best-row strong {
  color: var(--cream);
}

.menu-actions {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  width: min(280px, 100%);
}

.btn-lg {
  padding: 0.7rem 1.25rem;
  font-size: 1.05rem;
}

.menu-fieldset {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(240, 215, 140, 0.35);
  border-radius: 12px;
  background: var(--panel);
  text-align: left;
  width: min(320px, 100%);
}

.menu-fieldset legend {
  padding: 0 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.menu-radio {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin: 0.45rem 0;
  cursor: pointer;
  font-size: 0.95rem;
  color: rgba(247, 241, 228, 0.9);
}

.menu-radio input {
  margin-top: 0.2rem;
  accent-color: var(--accent);
}

.menu-select-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1.1rem;
  width: min(320px, 100%);
  text-align: left;
  font-size: 0.95rem;
  color: rgba(247, 241, 228, 0.9);
}

.menu-select-row select {
  font: inherit;
  border-radius: 999px;
  border: 1px solid rgba(240, 215, 140, 0.45);
  background: var(--panel);
  color: var(--cream);
  padding: 0.55rem 1rem;
  cursor: pointer;
}

.menu-howto-list {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  max-width: 36ch;
  text-align: left;
  color: rgba(247, 241, 228, 0.88);
  font-size: 0.95rem;
  line-height: 1.5;
}

.menu-howto-list li + li {
  margin-top: 0.45rem;
}

.menu-howto-par {
  margin: 0 0 1.1rem;
  font-size: 0.9rem;
  color: rgba(247, 241, 228, 0.78);
}

.hud-difficulty strong {
  color: var(--accent);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-announce {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.app {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 2.75rem 1rem 2rem;
}

.hud {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem 1.25rem;
  align-items: end;
  margin-bottom: 0.85rem;
}

.hud-brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.5vw, 2.15rem);
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--cream);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}

.hud-eyebrow {
  margin: 0 0 0.15rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hud-stats {
  display: flex;
  gap: 1rem;
  font-size: 0.95rem;
  color: rgba(247, 241, 228, 0.88);
}

.hud-stats strong {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.hud-actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
}

.map-pick select,
.btn {
  font: inherit;
  border-radius: 999px;
  border: 1px solid rgba(240, 215, 140, 0.45);
  background: var(--panel);
  color: var(--cream);
  padding: 0.55rem 1rem;
  cursor: pointer;
}

.map-pick select {
  appearance: none;
  padding-right: 1.75rem;
  background-image: linear-gradient(45deg, transparent 50%, var(--accent) 50%),
    linear-gradient(135deg, var(--accent) 50%, transparent 50%);
  background-position: calc(100% - 14px) calc(50% - 2px), calc(100% - 9px) calc(50% - 2px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.btn:hover,
.map-pick select:hover {
  border-color: var(--accent);
}

.btn:focus-visible,
.map-pick select:focus-visible,
.tile:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn-primary {
  background: linear-gradient(180deg, #e8b84a 0%, #c7922e 100%);
  color: #1a2430;
  border-color: #f0d78c;
  font-weight: 700;
}

.stage {
  position: relative;
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(240, 215, 140, 0.2);
  isolation: isolate;
}

.stage-map {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: top;
  pointer-events: none;
  user-select: none;
  transition: opacity 0.45s ease;
}

.board-wrap {
  position: absolute;
  inset: 12% 22% 14% 22%;
  display: grid;
  place-items: center;
}

.board {
  height: 100%;
  width: auto;
  max-width: 100%;
  display: grid;
  gap: clamp(0.4rem, 1.2vw, 0.7rem);
}

.board--hard {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: repeat(4, minmax(0, 1fr));
  aspect-ratio: 1;
}

.board--easy {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  aspect-ratio: 2 / 1;
  max-height: 55%;
}

.tile {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: 0;
  border: 0;
  background: transparent;
  perspective: 900px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.tile-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform var(--flip-ms) cubic-bezier(0.2, 0.75, 0.25, 1);
  border-radius: 12px;
}

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

.tile-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 12px;
  display: grid;
  place-items: center;
  overflow: hidden;
  box-shadow:
    0 6px 14px rgba(0, 0, 0, 0.35),
    inset 0 0 0 2px rgba(255, 255, 255, 0.18);
}

.tile-back {
  background:
    radial-gradient(circle at 50% 40%, rgba(255, 220, 140, 0.22), transparent 55%),
    linear-gradient(145deg, var(--tile-back) 0%, var(--tile-back-deep) 100%);
  border: 3px solid var(--tile-edge);
}

.tile-back::before {
  content: "";
  width: 42%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 3px solid rgba(240, 215, 140, 0.75);
  box-shadow: inset 0 0 0 6px rgba(143, 42, 34, 0.55);
  background:
    radial-gradient(circle at 50% 45%, #f0d78c 0 18%, transparent 19%),
    radial-gradient(circle at 50% 55%, transparent 34%, rgba(240, 215, 140, 0.55) 35% 42%, transparent 43%);
}

.tile-front {
  transform: rotateY(180deg);
  background: #050505;
  border: 3px solid var(--tile-edge);
}

.tile-front img {
  width: 92%;
  height: 92%;
  object-fit: contain;
  pointer-events: none;
  user-select: none;
}

.tile.is-matched {
  pointer-events: none;
  animation: match-pop 0.55s ease forwards;
}

.tile.is-locked {
  pointer-events: none;
}

.tile.is-mismatch .tile-inner {
  animation: mismatch-shake 0.45s ease;
}

@keyframes match-pop {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  55% {
    opacity: 1;
    transform: scale(1.08);
  }
  100% {
    opacity: 0;
    transform: scale(0.55);
    visibility: hidden;
  }
}

@keyframes mismatch-shake {
  0%,
  100% {
    transform: rotateY(180deg) translateX(0);
  }
  25% {
    transform: rotateY(180deg) translateX(-5px);
  }
  75% {
    transform: rotateY(180deg) translateX(5px);
  }
}

.hint {
  margin: 0.85rem 0 0;
  text-align: center;
  color: rgba(247, 241, 228, 0.78);
  font-size: 0.95rem;
}

.win {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(8, 14, 20, 0.62);
  backdrop-filter: blur(4px);
  z-index: 20;
}

.win[hidden] {
  display: none;
}

.win-card {
  width: min(420px, 100%);
  padding: 1.6rem 1.4rem 1.35rem;
  border-radius: 18px;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(40, 58, 74, 0.96), rgba(18, 28, 38, 0.98));
  border: 1px solid rgba(240, 215, 140, 0.45);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.45);
  animation: win-in 0.45s ease;
}

.win-stars {
  margin: 0;
  color: var(--accent);
  letter-spacing: 0.35em;
}

.win-card h2 {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.55rem;
}

.win-rating {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.win-rating[data-tier="excellent"] {
  color: #6dd4a0;
}

.win-rating[data-tier="great"] {
  color: #7ec8f0;
}

.win-rating[data-tier="standard"] {
  color: var(--accent);
}

.win-rating[data-tier="needs-improvement"] {
  color: rgba(247, 241, 228, 0.75);
}

.win-best-note {
  margin: 0 0 0.85rem;
  font-size: 0.9rem;
  color: #6dd4a0;
  font-weight: 600;
}

.win-unlock {
  margin: 0 0 1rem;
  padding: 0.85rem 0.9rem;
  border-radius: 12px;
  background: rgba(61, 154, 106, 0.15);
  border: 1px solid rgba(109, 212, 160, 0.45);
  text-align: center;
}

.win-unlock-title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: #6dd4a0;
}

.win-unlock-text {
  margin: 0 0 0.75rem;
  font-size: 0.92rem;
  color: rgba(247, 241, 228, 0.88);
}

.win-unlock-label {
  margin: 0 0 0.35rem;
  font: 600 0.68rem var(--font-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(247, 241, 228, 0.65);
}

.win-unlock-code {
  display: block;
  margin: 0 0 0.5rem;
  font: 600 1rem monospace;
  color: #6dd4a0;
  letter-spacing: 0.05em;
}

.win-unlock-hint {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: rgba(247, 241, 228, 0.75);
}

.win-unlock-hint a {
  color: #6dd4a0;
}

.win-unlock .btn {
  text-decoration: none;
  display: inline-flex;
}

.win-lede {
  margin: 0 0 0.5rem;
  color: rgba(247, 241, 228, 0.85);
}

.win-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: center;
}

.win-actions .btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@keyframes win-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 720px) {
  .hud {
    grid-template-columns: 1fr auto auto;
    align-items: center;
  }

  .hud-actions {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .menu-shell {
    padding: 2.25rem 0.65rem 1.5rem;
  }

  .menu-panel {
    padding: 1rem 0.85rem 1.5rem;
  }

  .board-wrap {
    inset: 8% 5% 10% 5%;
  }

  .board {
    width: 100%;
    gap: 0.3rem;
  }

  .board--easy {
    max-height: 48%;
  }

  .tile-face {
    border-radius: 9px;
  }

  .tile-back,
  .tile-front {
    border-width: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .menu-stage-map,
  .stage-map,
  .menu-stage-map.is-fading,
  .stage-map.is-fading,
  .tile-inner,
  .tile.is-matched,
  .tile.is-mismatch .tile-inner,
  .win-card,
  .menu-panel {
    transition: none !important;
    animation: none !important;
  }

  .tile.is-matched {
    opacity: 0;
    visibility: hidden;
  }
}