:root {
  color-scheme: dark;
  --bg-1: #120712;
  --bg-2: #261127;
  --panel: rgba(20, 10, 22, 0.88);
  --panel-border: rgba(255, 120, 174, 0.2);
  --text: #ffe7f1;
  --muted: #c9a7ba;
  --accent: #ff4f93;
  --accent-2: #ff8fb7;
  --theme-tab-bg: rgba(255, 255, 255, 0.04);
  --theme-tab-active: rgba(255, 79, 147, 0.2);
  --theme-tab-border: rgba(255, 255, 255, 0.08);
  --theme-tab-glow: rgba(255, 79, 147, 0.28);
  --chip-bg: rgba(18, 10, 26, 0.58);
  --chip-border: rgba(255, 255, 255, 0.08);
  --board-glow: rgba(255, 79, 147, 0.08);
  --board-top-glow: rgba(255, 68, 129, 0.16);
  --board-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
  --status-flash: #ffd8a8;
  --status-flash-shadow: rgba(255, 192, 132, 0.55);
  --card-back: rgba(32, 18, 40, 0.96);
  --card-front: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.1);
  --card-match: rgba(255, 79, 147, 0.2);
  --card-icon-glow: rgba(255, 143, 183, 0.3);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, color-mix(in srgb, var(--accent) 35%, transparent), transparent 30%),
    linear-gradient(180deg, var(--bg-2), var(--bg-1) 48%, #09050b);
  color: var(--text);
}

body {
  min-height: 100vh;
  min-height: 100dvh;
}

.app {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 8px 12px 10px;
}

.panel {
  width: min(100%, 780px);
  max-height: calc(100dvh - 16px);
  padding: 18px 20px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 34px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    var(--panel);
  box-shadow: var(--board-shadow);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  transition:
    color 120ms ease,
    border-color 120ms ease,
    background 120ms ease,
    transform 120ms ease;
}

.back-link:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 30%, rgba(255, 255, 255, 0.08));
  background: color-mix(in srgb, var(--accent) 12%, rgba(255, 255, 255, 0.04));
}

.back-link:active {
  transform: translateY(1px);
}

.eyebrow,
.overlay__eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.82rem;
  color: var(--accent-2);
}

h1,
h2,
.legend,
.board-chip__label,
.board-chip strong,
#game-over-copy,
#start-copy {
  margin: 0;
}

h1 {
  margin-top: 12px;
  font-size: clamp(2.6rem, 6.2vw, 4.2rem);
  line-height: 0.94;
  text-align: center;
}

.theme-switcher {
  margin-top: 12px;
}

.theme-rail {
  position: relative;
  padding: 12px 0 10px;
}

.theme-rail::before,
.theme-rail::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 45%, rgba(255, 255, 255, 0.1)), transparent);
}

.theme-rail::before {
  top: 0;
}

.theme-rail::after {
  bottom: 0;
}

.theme-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 6px 2px;
  scrollbar-width: thin;
}

.theme-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid var(--theme-tab-border);
  background: var(--theme-tab-bg);
  color: var(--muted);
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.theme-tab.is-active {
  color: var(--text);
  background:
    radial-gradient(circle at center, color-mix(in srgb, var(--accent) 22%, transparent), transparent 70%),
    linear-gradient(180deg, var(--theme-tab-active), rgba(255, 255, 255, 0.06));
  border-color: color-mix(in srgb, var(--accent) 40%, rgba(255, 255, 255, 0.1));
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--accent-2) 15%, transparent),
    0 0 0 1px color-mix(in srgb, var(--accent) 16%, transparent),
    0 0 26px var(--theme-tab-glow);
}

.theme-tab:active {
  transform: translateY(1px);
}

.board-wrap {
  position: relative;
  margin-top: 12px;
  width: min(100%, calc(100dvh - 280px), 540px);
  margin-inline: auto;
  padding: 70px 14px 14px;
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.03) 0, rgba(255, 255, 255, 0.03) 1px, transparent 1px, transparent 21px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.03) 0, rgba(255, 255, 255, 0.03) 1px, transparent 1px, transparent 21px),
    radial-gradient(circle at top, var(--board-top-glow), transparent 40%),
    #140b17;
  box-shadow:
    inset 0 0 50px var(--board-glow),
    0 20px 35px rgba(0, 0, 0, 0.38);
}

.board-wrap--flash {
  box-shadow:
    inset 0 0 70px color-mix(in srgb, var(--accent) 25%, transparent),
    0 0 0 1px color-mix(in srgb, var(--accent-2) 30%, transparent),
    0 18px 40px rgba(0, 0, 0, 0.4),
    0 0 28px color-mix(in srgb, var(--accent) 30%, transparent);
}

.board-hud {
  position: absolute;
  top: 14px;
  left: 14px;
  right: 14px;
  z-index: 2;
  display: flex;
  gap: 10px;
  pointer-events: none;
}

.board-chip {
  min-width: 96px;
  padding: 9px 11px;
  border-radius: 16px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(10px);
}

.board-chip__label {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
}

.board-chip strong {
  display: block;
  margin-top: 4px;
  font-size: 1rem;
}

.memory-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  min-height: min(62vw, 420px);
}

.memory-card {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 0;
  padding: 0;
  border-radius: 22px;
  background: transparent;
  cursor: pointer;
  perspective: 800px;
}

.memory-card:disabled {
  cursor: default;
}

.memory-card__reveal,
.memory-card__cover {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: 22px;
}

.memory-card__reveal {
  border: 1px solid color-mix(in srgb, var(--card-border) 90%, rgba(255, 255, 255, 0.04));
  background:
    radial-gradient(circle at top, color-mix(in srgb, var(--accent) 10%, transparent), transparent 48%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), var(--card-front));
  box-shadow:
    inset 0 0 26px rgba(0, 0, 0, 0.18),
    0 10px 20px rgba(0, 0, 0, 0.12);
  opacity: 0;
  transition: opacity 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.memory-card__cover {
  overflow: hidden;
  transform-origin: left center;
  transform-style: preserve-3d;
  transition:
    transform 260ms ease,
    opacity 220ms ease,
    box-shadow 180ms ease;
  box-shadow:
    0 16px 28px rgba(0, 0, 0, 0.22),
    0 0 0 1px color-mix(in srgb, var(--accent) 12%, transparent);
  z-index: 2;
  background: color-mix(in srgb, var(--card-back) 96%, #120a14);
}

.memory-card__cover-inner {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: 22px;
  border: 1px solid var(--card-border);
  background:
    radial-gradient(circle at top, color-mix(in srgb, var(--accent) 10%, #000 0%), transparent 54%),
    linear-gradient(180deg, color-mix(in srgb, var(--card-back) 88%, #1a101d), color-mix(in srgb, var(--card-back) 96%, #0f0912));
  box-shadow:
    inset 0 0 24px rgba(0, 0, 0, 0.18),
    inset 0 0 0 1px color-mix(in srgb, var(--accent) 12%, transparent);
  backface-visibility: hidden;
}

.memory-card.is-flipped .memory-card__reveal,
.memory-card.is-matched .memory-card__reveal {
  opacity: 1;
}

.memory-card.is-flipped .memory-card__cover,
.memory-card.is-matched .memory-card__cover {
  transform: rotateY(-104deg);
  opacity: 0;
  pointer-events: none;
}

.memory-card.is-matched .memory-card__reveal {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 18%, rgba(255, 255, 255, 0.08)), var(--card-match));
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--accent) 25%, transparent),
    0 0 22px color-mix(in srgb, var(--accent) 24%, transparent);
}

.memory-card__back-shell {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    repeating-linear-gradient(
      45deg,
      transparent 0,
      transparent 12px,
      color-mix(in srgb, var(--accent) 7%, transparent) 12px,
      color-mix(in srgb, var(--accent) 7%, transparent) 13px
    ),
    repeating-linear-gradient(
      -45deg,
      transparent 0,
      transparent 12px,
      color-mix(in srgb, var(--accent-2) 5%, transparent) 12px,
      color-mix(in srgb, var(--accent-2) 5%, transparent) 13px
    );
}

.memory-card__back-core {
  position: relative;
  display: grid;
  place-items: center;
  width: 42%;
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 24%, transparent);
  box-shadow:
    inset 0 0 22px rgba(0, 0, 0, 0.2),
    0 0 24px color-mix(in srgb, var(--accent) 10%, transparent);
}

.memory-card__back-ring {
  width: 66%;
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  border: 2px solid color-mix(in srgb, var(--accent-2) 34%, transparent);
  box-shadow: 0 0 16px color-mix(in srgb, var(--accent) 14%, transparent);
}

.memory-card__back-dot {
  position: absolute;
  width: 18%;
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-2) 72%, white 8%);
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent-2) 36%, transparent);
}

.memory-card__back-corner {
  position: absolute;
  font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif;
  font-size: clamp(0.8rem, 2vw, 1rem);
  line-height: 1;
  color: color-mix(in srgb, var(--accent-2) 72%, white 8%);
  opacity: 0.92;
  text-shadow: 0 0 10px color-mix(in srgb, var(--accent) 22%, transparent);
}

.memory-card__back-corner--tl {
  top: 10px;
  left: 12px;
}

.memory-card__back-corner--br {
  right: 12px;
  bottom: 10px;
}

.memory-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif;
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1;
  filter: none;
  text-shadow: none;
  opacity: 1;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  border-radius: 30px;
  background: rgba(4, 1, 6, 0.62);
}

.hidden {
  display: none;
}

.overlay__card {
  width: min(100%, 340px);
  padding: 24px 22px;
  text-align: center;
  border-radius: 24px;
  background: rgba(18, 7, 18, 0.94);
  border: 1px solid color-mix(in srgb, var(--accent-2) 22%, transparent);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
}

#game-over-copy,
#start-copy {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.45;
}

.countdown {
  margin-top: 16px;
  color: var(--status-flash);
  font-size: 2rem;
  font-weight: 700;
  text-shadow: 0 0 18px var(--status-flash-shadow);
}

button {
  margin-top: 18px;
  padding: 13px 22px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  color: #fff5fb;
  cursor: pointer;
  background: linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 74%, black));
  box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 26%, transparent);
}

.legend {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

.legend strong {
  color: var(--text);
}

@media (max-width: 720px) {
  .panel {
    padding-inline: 14px;
    border-radius: 28px;
  }

  .back-link {
    font-size: 0.82rem;
    padding: 7px 10px;
  }

  .board-wrap {
    width: min(100%, calc(100dvh - 244px), 480px);
    padding: 78px 10px 10px;
  }

  .board-hud {
    flex-wrap: wrap;
  }

  .memory-board {
    gap: 10px;
  }

  .legend {
    flex-direction: column;
  }
}

@media (max-height: 900px) {
  .panel {
    padding-top: 16px;
    padding-bottom: 12px;
  }

  h1 {
    font-size: clamp(2.4rem, 5.8vw, 3.7rem);
  }

  .board-wrap {
    width: min(100%, calc(100dvh - 286px), 500px);
  }
}