/**
 * Kids Memory Games — front-end styles.
 * Everything is scoped under .kmg-app so theme styles stay untouched.
 *
 * Palette ("arcade candy"):
 *   night   #241b4d  deep violet stage
 *   panel   #322566  raised surfaces
 *   coral   #ff5d73  primary action / hearts
 *   sun     #ffc53d  score, stars, win state
 *   mint    #3ddc97  success / matches
 *   sky     #4cc9f0  info / echo pad
 */

.kmg-app {
  --kmg-night: #241b4d;
  --kmg-panel: #322566;
  --kmg-panel-2: #3d2f7a;
  --kmg-coral: #ff5d73;
  --kmg-sun: #ffc53d;
  --kmg-mint: #3ddc97;
  --kmg-sky: #4cc9f0;
  --kmg-ink: #fff8f0;
  --kmg-ink-dim: #b9aee6;
  --kmg-radius: 18px;
  --kmg-font: ui-rounded, "SF Pro Rounded", "Trebuchet MS", "Comic Sans MS",
    "Segoe UI", system-ui, sans-serif;

  font-family: var(--kmg-font);
  background: radial-gradient(1200px 600px at 50% -10%, #3d2f7a 0%, var(--kmg-night) 60%);
  color: var(--kmg-ink);
  border-radius: 24px;
  padding: 20px;
  max-width: 720px;
  margin: 24px auto;
  box-shadow: 0 20px 50px rgba(20, 12, 60, 0.45);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}
.kmg-app *,
.kmg-app *::before,
.kmg-app *::after {
  box-sizing: border-box;
}

/* ---------- Header ---------- */
.kmg-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.kmg-title {
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 800;
  letter-spacing: 0.5px;
  margin: 0;
  text-shadow: 0 3px 0 rgba(0, 0, 0, 0.25);
}
.kmg-title .kmg-spark {
  color: var(--kmg-sun);
}
.kmg-header-actions {
  display: flex;
  gap: 8px;
}

/* ---------- Buttons ---------- */
.kmg-btn {
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--kmg-ink);
  background: var(--kmg-panel-2);
  border: 0;
  border-bottom: 4px solid rgba(0, 0, 0, 0.35);
  border-radius: 14px;
  padding: 10px 16px;
  cursor: pointer;
  transition: transform 0.08s ease, filter 0.15s ease;
  touch-action: manipulation;
}
.kmg-btn:hover {
  filter: brightness(1.12);
}
.kmg-btn:active {
  transform: translateY(2px);
  border-bottom-width: 2px;
}
.kmg-btn:focus-visible,
.kmg-card:focus-visible,
.kmg-pad:focus-visible,
.kmg-cartridge:focus-visible,
.kmg-chip:focus-visible {
  outline: 3px solid var(--kmg-sun);
  outline-offset: 2px;
}
.kmg-btn--primary {
  background: var(--kmg-coral);
}
.kmg-btn--icon {
  padding: 10px 12px;
  font-size: 1.05rem;
  line-height: 1;
}

/* ---------- Game picker (the "cartridge shelf") ---------- */
.kmg-picker {
  display: grid;
  gap: 14px;
}
.kmg-picker-intro {
  margin: 0 0 4px;
  color: var(--kmg-ink-dim);
  font-weight: 600;
}
.kmg-cartridge {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  text-align: left;
  font-family: inherit;
  color: var(--kmg-ink);
  background: var(--kmg-panel);
  border: 0;
  border-bottom: 5px solid rgba(0, 0, 0, 0.35);
  border-radius: var(--kmg-radius);
  padding: 16px;
  cursor: pointer;
  transition: transform 0.12s ease, filter 0.15s ease;
}
.kmg-cartridge:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}
.kmg-cartridge:active {
  transform: translateY(2px);
}
.kmg-cartridge-emoji {
  font-size: 2.2rem;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  flex-shrink: 0;
}
.kmg-cartridge--match .kmg-cartridge-emoji { background: rgba(255, 93, 115, 0.25); }
.kmg-cartridge--echo .kmg-cartridge-emoji { background: rgba(76, 201, 240, 0.25); }
.kmg-cartridge--number .kmg-cartridge-emoji { background: rgba(255, 197, 61, 0.25); }
.kmg-cartridge-name {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 0 0 2px;
}
.kmg-cartridge-desc {
  margin: 0;
  font-size: 0.88rem;
  color: var(--kmg-ink-dim);
  font-weight: 600;
}
.kmg-cartridge-best {
  margin-left: auto;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--kmg-sun);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ---------- Option chips (theme / difficulty pickers) ---------- */
.kmg-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 16px;
}
.kmg-options-label {
  width: 100%;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--kmg-ink-dim);
  margin: 4px 0 0;
}
.kmg-chip {
  font-family: inherit;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--kmg-ink);
  background: var(--kmg-panel);
  border: 2px solid transparent;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  transition: filter 0.15s ease;
}
.kmg-chip:hover {
  filter: brightness(1.15);
}
.kmg-chip[aria-pressed="true"] {
  background: var(--kmg-coral);
  border-color: var(--kmg-ink);
}

/* ---------- HUD ---------- */
.kmg-hud {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 18px;
  background: var(--kmg-panel);
  border-radius: var(--kmg-radius);
  padding: 10px 14px;
  margin-bottom: 16px;
  font-weight: 800;
}
.kmg-hud-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
}
.kmg-hud-stat .kmg-hud-num {
  color: var(--kmg-sun);
  min-width: 2ch;
  text-align: left;
}

/* ---------- Match Cards grid ---------- */
.kmg-grid {
  display: grid;
  gap: 10px;
  perspective: 900px;
}
.kmg-grid--easy   { grid-template-columns: repeat(4, 1fr); }
.kmg-grid--medium { grid-template-columns: repeat(4, 1fr); }
.kmg-grid--hard   { grid-template-columns: repeat(6, 1fr); }

.kmg-card {
  position: relative;
  aspect-ratio: 3 / 4;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
  border-radius: 14px;
}
.kmg-card.is-flipped {
  transform: rotateY(180deg);
}
.kmg-card-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: 14px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  font-size: clamp(1.4rem, 6vw, 2.4rem);
  border-bottom: 4px solid rgba(0, 0, 0, 0.3);
}
.kmg-card-back {
  background: linear-gradient(145deg, var(--kmg-coral), #d63a5e);
  color: rgba(255, 255, 255, 0.85);
  font-weight: 900;
  font-size: clamp(1.1rem, 4.5vw, 1.6rem);
}
.kmg-card-front {
  background: var(--kmg-ink);
  transform: rotateY(180deg);
}
.kmg-card.is-matched {
  cursor: default;
}
.kmg-card.is-matched .kmg-card-front {
  background: var(--kmg-mint);
  animation: kmg-pop 0.4s ease;
}
@keyframes kmg-pop {
  0%   { transform: rotateY(180deg) scale(1); }
  50%  { transform: rotateY(180deg) scale(1.12); }
  100% { transform: rotateY(180deg) scale(1); }
}
.kmg-card.is-wrong {
  animation: kmg-shake 0.4s ease;
}
@keyframes kmg-shake {
  0%, 100% { translate: 0 0; }
  25% { translate: -4px 0; }
  75% { translate: 4px 0; }
}

/* ---------- Echo Pads ---------- */
.kmg-pads {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  max-width: 380px;
  margin: 0 auto;
}
.kmg-pad {
  aspect-ratio: 1;
  border: 0;
  border-radius: 22px;
  border-bottom: 6px solid rgba(0, 0, 0, 0.35);
  cursor: pointer;
  font-size: 2rem;
  transition: filter 0.1s ease, transform 0.1s ease;
  filter: brightness(0.65) saturate(0.85);
}
.kmg-pad--0 { background: var(--kmg-coral); }
.kmg-pad--1 { background: var(--kmg-sun); }
.kmg-pad--2 { background: var(--kmg-mint); }
.kmg-pad--3 { background: var(--kmg-sky); }
.kmg-pad.is-lit,
.kmg-pad:active {
  filter: brightness(1.25) saturate(1.2);
  transform: scale(0.96);
}
.kmg-pad:disabled {
  cursor: default;
}
.kmg-echo-status {
  text-align: center;
  font-weight: 800;
  font-size: 1.05rem;
  min-height: 1.6em;
  margin: 14px 0;
}

/* ---------- Flash Number ---------- */
.kmg-flash {
  text-align: center;
}
.kmg-flash-display {
  font-size: clamp(2.2rem, 10vw, 3.6rem);
  font-weight: 900;
  letter-spacing: 6px;
  min-height: 1.4em;
  margin: 20px 0;
  color: var(--kmg-sun);
  font-variant-numeric: tabular-nums;
}
.kmg-flash-input {
  font-family: inherit;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 4px;
  text-align: center;
  width: min(320px, 90%);
  padding: 12px;
  border-radius: 14px;
  border: 3px solid var(--kmg-panel-2);
  background: var(--kmg-ink);
  color: var(--kmg-night);
}
.kmg-flash-input:focus-visible {
  outline: 3px solid var(--kmg-sun);
  outline-offset: 2px;
}
.kmg-flash-bar {
  height: 8px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.15);
  overflow: hidden;
  max-width: 320px;
  margin: 0 auto 8px;
}
.kmg-flash-bar-fill {
  height: 100%;
  width: 100%;
  background: var(--kmg-sky);
  transform-origin: left;
}

/* ---------- Win / game-over panel ---------- */
.kmg-panel-msg {
  text-align: center;
  background: var(--kmg-panel);
  border-radius: var(--kmg-radius);
  padding: 22px 18px;
  animation: kmg-rise 0.35s ease;
}
@keyframes kmg-rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.kmg-panel-msg h3 {
  margin: 0 0 6px;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--kmg-sun);
}
.kmg-panel-msg p {
  margin: 0 0 14px;
  color: var(--kmg-ink-dim);
  font-weight: 700;
}
.kmg-panel-msg .kmg-new-best {
  color: var(--kmg-mint);
}
.kmg-panel-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ---------- Confetti (signature win moment) ---------- */
.kmg-confetti {
  position: absolute;
  top: -12px;
  width: 10px;
  height: 14px;
  border-radius: 3px;
  pointer-events: none;
  animation: kmg-fall linear forwards;
}
@keyframes kmg-fall {
  to {
    transform: translateY(110vh) rotate(720deg);
    opacity: 0.6;
  }
}

/* ---------- Misc ---------- */
.kmg-noscript {
  text-align: center;
  font-family: var(--kmg-font, sans-serif);
}
.kmg-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 480px) {
  .kmg-app { padding: 14px; border-radius: 18px; }
  .kmg-grid { gap: 7px; }
  .kmg-grid--hard { grid-template-columns: repeat(4, 1fr); }
}

/* Respect users who prefer less motion. */
@media (prefers-reduced-motion: reduce) {
  .kmg-app *,
  .kmg-app *::before,
  .kmg-app *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .kmg-confetti { display: none; }
}

/* Loading placeholder (replaced by JS on boot) */
.kmg-app .kmg-loading {
  text-align: center;
  font-weight: 700;
  color: var(--kmg-ink-dim);
  padding: 30px 10px;
  margin: 0;
}

/* Flash Number submit button (mobile-friendly) */
.kmg-flash-check {
  display: block;
  margin: 14px auto 0;
  min-width: 160px;
  font-size: 1.05rem;
}
.kmg-flash-check[hidden] {
  display: none;
}