:root {
  --bg-deep: #0d0f14;
  --bg-mid: #151922;
  --bg-card: rgba(22, 26, 36, 0.85);
  --text: #e8ecf4;
  --text-muted: #8b93a7;
  --border: rgba(255, 255, 255, 0.08);
  --accent: #5ce1e6;
  --danger: #ff6b6b;
  --ok: #69f0ae;
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --radius: 14px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, #1a2030 0%, transparent 55%),
    radial-gradient(900px 600px at 90% 20%, #1e1a35 0%, transparent 50%),
    linear-gradient(165deg, var(--bg-deep) 0%, #0a0c10 100%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 10px;
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.hero {
  padding: 2.5rem 0 1.5rem;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero p {
  margin: 0;
  max-width: 36ch;
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.5;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0 1.25rem;
}

.chip {
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease;
}

.chip:hover {
  transform: translateY(-1px);
  color: var(--text);
}

.chip[aria-pressed="true"] {
  background: rgba(92, 225, 230, 0.15);
  color: var(--text);
  border-color: rgba(92, 225, 230, 0.35);
}

.category-block {
  margin-top: 2.5rem;
  scroll-margin-top: 1rem;
}

.category-block h2 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.game-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.25rem 1.1rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.game-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--card-accent) 22%, transparent) 0%,
    transparent 55%
  );
  opacity: 0.9;
  pointer-events: none;
}

.game-card:hover,
.game-card:focus-within {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--card-accent) 45%, var(--border));
}

.game-card-inner {
  position: relative;
  z-index: 1;
}

.game-card .icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
  background: color-mix(in srgb, var(--card-accent) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 35%, transparent);
}

.game-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
  font-weight: 700;
}

.game-card p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.45;
  flex: 1;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.pill.accent {
  color: var(--card-accent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 40%, transparent);
}

.cta {
  margin-top: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--card-accent);
}

.game-card:hover .cta {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.hidden {
  display: none !important;
}

/* Play page */
.play-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.play-top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 0.85rem 1.25rem;
  background: rgba(10, 12, 18, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.back-link {
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: 8px;
  border: 1px solid transparent;
}

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

.play-top h1 {
  margin: 0;
  flex: 1;
  min-width: 140px;
  font-size: 1.15rem;
  font-weight: 700;
}

.stat-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.stat {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
}

.stat.timer {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.stat.score {
  color: var(--ok);
  border-color: color-mix(in srgb, var(--ok) 35%, var(--border));
}

.btn-restart {
  padding: 0.45rem 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-restart:hover {
  background: rgba(255, 255, 255, 0.12);
}

.play-main {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 3rem;
}

.game-summary {
  margin-bottom: 1rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.game-summary p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.5;
}

.instructions {
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  margin-bottom: 1.25rem;
  line-height: 1.55;
  color: var(--text-muted);
}

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

.instructions-actions {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn-primary {
  padding: 0.55rem 1.1rem;
  font-weight: 700;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--game-accent, var(--accent)) 85%, white) 0%,
    var(--game-accent, var(--accent)) 100%
  );
  color: #0a0c10;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-ghost {
  padding: 0.55rem 1rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

#game-root {
  min-height: 280px;
}

.result-panel {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.05) 0%,
    rgba(255, 255, 255, 0.02) 100%
  );
  border: 1px solid var(--border);
  text-align: center;
}

.result-panel h2 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
}

.result-panel p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

/* Chess board */
.chess-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.chessboard-host {
  position: relative;
  width: min(94vw, 460px);
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid rgba(0, 0, 0, 0.45);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.chess-hit-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
}

.chess-hit {
  appearance: none;
  border: 0;
  margin: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
}

.chess-hit:hover {
  outline: 2px solid rgba(255, 255, 255, 0.45);
  outline-offset: -2px;
  z-index: 1;
}

.chess-hit:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.8);
  outline-offset: -2px;
}

.chess-hit.mark-correct {
  box-shadow: inset 0 0 0 3px var(--ok);
}

.chess-hit.mark-wrong {
  box-shadow: inset 0 0 0 3px var(--danger);
}

.phase-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
}

/* Tile grids */
.tile-grid {
  display: grid;
  gap: 0.45rem;
  margin: 0 auto;
  width: fit-content;
}

.tile {
  width: clamp(44px, 12vw, 56px);
  height: clamp(44px, 12vw, 56px);
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--text-muted);
  transition: background 0.12s ease, transform 0.12s ease, box-shadow 0.12s ease;
}

.tile.interactive {
  cursor: pointer;
}

.tile.interactive:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

.tile.interactive:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
}

.tile:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.tile.highlight {
  background: color-mix(in srgb, var(--game-accent, var(--accent)) 35%, transparent);
  border-color: color-mix(in srgb, var(--game-accent, var(--accent)) 55%, transparent);
  color: var(--text);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--game-accent, var(--accent)) 40%, transparent);
}

.tile.selected {
  background: rgba(105, 240, 174, 0.2);
  border-color: var(--ok);
}

.tile.mark-wrong {
  background: rgba(255, 71, 87, 0.26);
  border-color: var(--danger);
  box-shadow: inset 0 0 0 2px var(--danger);
}

.tile.flash {
  animation: flash-tile 0.35s ease;
}

@keyframes flash-tile {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.06);
    box-shadow: 0 0 20px color-mix(in srgb, var(--game-accent, var(--accent)) 50%, transparent);
  }
  100% {
    transform: scale(1);
  }
}

/* Number sweep */
.number-sweep-field {
  position: relative;
  width: 100%;
  min-height: min(52vh, 380px);
  margin: 0 auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.22);
}

.number-sweep-btn {
  position: absolute;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 10px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border);
  color: var(--text);
  transform: translate(-50%, -50%);
  transition: opacity 0.15s ease, transform 0.12s ease;
}

.number-sweep-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.16);
}

.number-sweep-btn.number-sweep-done {
  opacity: 0.35;
  pointer-events: none;
}

.number-sweep-btn.mark-wrong {
  border-color: var(--danger);
  box-shadow: inset 0 0 0 2px var(--danger);
}

.number-sweep-btn.mark-correct {
  border-color: var(--ok);
  box-shadow: inset 0 0 0 2px var(--ok);
}

/* Stroop */
.stroop-word {
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 800;
  text-align: center;
  letter-spacing: 0.06em;
  margin: 0.75rem 0 1.25rem;
}

.stroop-choices {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.stroop-swatch {
  width: 3.35rem;
  height: 3.35rem;
  border-radius: 50%;
  background: var(--swatch);
  border: 2px solid rgba(255, 255, 255, 0.28);
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.stroop-swatch:hover:not(:disabled) {
  transform: scale(1.06);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.stroop-swatch:disabled {
  opacity: 0.55;
  cursor: default;
}

.stroop-swatch.mark-wrong {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 55%, transparent);
}

.stroop-swatch.mark-correct {
  border-color: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 55%, transparent);
}

/* Reaction */
.reaction-btn {
  display: block;
  width: 100%;
  max-width: 300px;
  margin: 1rem auto;
  padding: 1.2rem 1rem;
  font-size: 1.15rem;
  font-weight: 700;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: background 0.15s ease, color 0.15s ease;
}

.reaction-wait {
  background: rgba(60, 60, 70, 0.9);
  color: rgb(200, 200, 210);
}

.reaction-go {
  background: linear-gradient(145deg, #5eead4 0%, #22c55e 100%);
  color: #0a0c10;
  border-color: rgba(255, 255, 255, 0.2);
}

.reaction-early {
  background: rgba(255, 71, 87, 0.35);
  color: var(--text);
  border-color: var(--danger);
}

/* Memory pairs */
.memory-grid {
  display: grid;
  gap: 0.5rem;
  max-width: 440px;
  margin: 0 auto;
}

.memory-card {
  aspect-ratio: 1;
  min-height: 56px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  font-size: clamp(1.25rem, 4vw, 1.55rem);
  line-height: 1;
  cursor: pointer;
  transition: background 0.12s ease, transform 0.1s ease;
}

.memory-card:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
}

.memory-card.memory-up {
  background: rgba(255, 255, 255, 0.12);
}

.memory-card.memory-matched {
  opacity: 0.55;
  cursor: default;
  border-color: var(--ok);
}

.memory-card.reveal-correct {
  border-color: var(--ok);
  background: rgba(105, 240, 174, 0.18);
}

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

@media (max-width: 520px) {
  .play-top h1 {
    width: 100%;
  }
}