/* Rhythm Merge 2048 — kid-friendly colorful UI, black notation */

.merge-panel {
  --merge-ink: #3e2723;
  --merge-ink-soft: #5d4037;
  --merge-rail-width: var(--control-rail-width, clamp(180px, 30vw, 240px));
  --merge-board-size: 360px;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  min-height: 100%;
  padding:
    max(6px, env(safe-area-inset-top))
    max(10px, env(safe-area-inset-right))
    max(8px, env(safe-area-inset-bottom))
    max(10px, env(safe-area-inset-left));
  box-sizing: border-box;
  overflow: hidden;
  background: linear-gradient(180deg, #b3e5fc 0%, #81d4fa 38%, #a5d6a7 100%);
}

.merge-panel[hidden] {
  display: none !important;
}

.merge-panel__deco {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.merge-panel__cloud {
  position: absolute;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 2px 8px rgba(255, 255, 255, 0.5);
}

.merge-panel__cloud--1 {
  width: 5rem;
  height: 2rem;
  top: 8%;
  left: 6%;
}

.merge-panel__cloud--2 {
  width: 4rem;
  height: 1.6rem;
  top: 14%;
  right: 10%;
}

.merge-panel__cloud--3 {
  width: 6rem;
  height: 2.2rem;
  bottom: 12%;
  left: 8%;
}

.merge-panel__hill {
  position: absolute;
  bottom: -2rem;
  border-radius: 50%;
  background: #66bb6a;
  opacity: 0.55;
}

.merge-panel__hill--1 {
  width: 14rem;
  height: 6rem;
  left: -3rem;
}

.merge-panel__hill--2 {
  width: 11rem;
  height: 5rem;
  right: -2rem;
  background: #81c784;
}

.merge-panel > *:not(.merge-panel__deco) {
  position: relative;
  z-index: 1;
}

/* Black notation — 2048 only */
.merge-tile__icon .notation-svg,
.merge-tile__icon .notation-svg--token,
.merge-tile__icon .notation-svg--merge,
.merge-cover-chain__tile .notation-svg,
.merge-cover-chain__tile .notation-svg--merge-cover {
  --notation-fill: #1a1a1a;
  --notation-stem: #1a1a1a;
  --notation-beam: #1a1a1a;
}

.merge-cover-screen .cover-title--merge {
  font-size: clamp(1.1rem, 4vw, 1.6rem);
}

.merge-cover-chain {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  margin: 1rem auto;
  max-width: 24rem;
}

.merge-cover-chain__tile {
  width: 3rem;
  height: 3.2rem;
  border-radius: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #fff9c4;
  border: 2px solid #f9e04a;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.1);
}

.merge-cover-chain__tile .token-icon {
  width: 1.75rem;
  height: 2rem;
}

.merge-cover-chain__arrow {
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.9rem;
  font-weight: 700;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.merge-cover-chain__clear {
  font-size: 0.68rem;
  color: #5d4037;
  background: #fffde7;
  border: 2px solid #fbc02d;
  padding: 0.4rem 0.55rem;
  border-radius: 0.45rem;
  font-weight: 700;
}

.merge-header {
  width: 100%;
  flex-shrink: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: clamp(4px, 1vmin, 8px);
}

.merge-body {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr var(--merge-rail-width);
  gap: clamp(8px, 2vw, 16px);
  align-items: stretch;
}

.merge-stage {
  min-width: 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.merge-sidebar {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(4px, 1vmin, 8px);
  padding: clamp(6px, 1.2vmin, 10px);
  background: rgba(255, 255, 255, 0.58);
  border-radius: 0.65rem;
  border: 2px solid rgba(255, 255, 255, 0.75);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.merge-header__title-block {
  flex: 1;
  min-width: 0;
}

.merge-header__title {
  margin: 0;
  font-size: clamp(1rem, 2.8vh, 1.3rem);
  font-weight: 800;
  color: var(--merge-ink);
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.merge-header__subtitle {
  margin: 0.3rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.merge-header__line {
  display: block;
  font-size: clamp(0.75rem, 2vh, 0.85rem);
  font-weight: 600;
  color: var(--merge-ink-soft);
  line-height: 1.45;
}

.merge-num {
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.merge-header__back {
  flex-shrink: 0;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 0.55rem;
  padding: 0.45rem 0.65rem;
  font-size: clamp(0.72rem, 2vh, 0.82rem);
  font-weight: 700;
  color: var(--merge-ink);
  background: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.08);
}

.merge-header__back:active {
  transform: scale(0.97);
}

.merge-stats {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
  margin-bottom: 0;
}

.merge-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 0.5rem;
  padding: 0.3rem 0.25rem;
  text-align: center;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.6);
}

.merge-stat:nth-child(1) { border-bottom: 3px solid #66bb6a; }
.merge-stat:nth-child(2) { border-bottom: 3px solid #42a5f5; }
.merge-stat--goal { border-bottom: 3px solid #ffa726; }

.merge-stat__label {
  font-size: 0.68rem;
  font-weight: 700;
  color: #78909c;
  line-height: 1.25;
  margin-bottom: 0.15rem;
}

.merge-stat__value {
  font-size: clamp(0.9rem, 2.6vh, 1.05rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--merge-ink);
  line-height: 1.2;
}

.merge-stat--goal .merge-stat__value {
  color: #e65100;
}

.merge-stat--moves .merge-stat__value {
  color: #1565c0;
}

.merge-stat__value--low {
  color: #c62828 !important;
  animation: merge-moves-pulse 1s ease-in-out infinite;
}

@keyframes merge-moves-pulse {
  50% { opacity: 0.65; }
}

.merge-run-status {
  width: 100%;
  min-height: 0;
  flex: 0 1 auto;
  margin: 0;
  padding: 0.4rem 0.5rem;
  box-sizing: border-box;
  font-size: clamp(0.75rem, 2.1vh, 0.85rem);
  font-weight: 700;
  line-height: 1.45;
  text-align: center;
  color: var(--merge-ink-soft);
  background: rgba(255, 255, 255, 0.78);
  border-radius: 0.55rem;
  border: 2px dashed rgba(93, 64, 55, 0.18);
}

.merge-run-status--qualified {
  color: #2e7d32;
  background: rgba(200, 230, 201, 0.85);
  border-color: rgba(46, 125, 50, 0.35);
}

.merge-run-status--warn {
  color: #bf360c;
  background: rgba(255, 224, 178, 0.9);
  border-color: rgba(191, 54, 12, 0.25);
}

.merge-board-wrap {
  position: relative;
  width: min(var(--merge-board-size), 100%);
  aspect-ratio: 1;
  flex-shrink: 0;
  margin: 0;
}

.merge-board {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 0.5rem;
  padding: 0.55rem;
  box-sizing: border-box;
  background: #8d6e63;
  border-radius: 0.75rem;
  border: 3px solid #6d4c41;
  box-shadow:
    inset 0 3px 10px rgba(0, 0, 0, 0.2),
    0 4px 0 rgba(0, 0, 0, 0.12);
  touch-action: none;
  user-select: none;
}

.merge-cell {
  background: rgba(255, 255, 255, 0.22);
  border-radius: 0.45rem;
  position: relative;
  aspect-ratio: 1;
  min-width: 0;
  min-height: 0;
}

.merge-tile {
  position: absolute;
  border-radius: 0.45rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-sizing: border-box;
  padding: 0.16rem 0.12rem 0.1rem;
  border: 2px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.12);
  transition: transform 0.1s ease;
  animation: merge-tile-pop 0.15s ease;
  overflow: visible;
}

@keyframes merge-tile-pop {
  0% { transform: scale(0.88); }
  100% { transform: scale(1); }
}

.merge-tile__icon {
  flex: 1 1 auto;
  min-height: 0;
  width: 88%;
  max-width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  padding-top: 0.08rem;
}

/* Override global .token-icon clamp sizes — merge cells are ~60–75px */
.merge-tile__icon .token-icon,
.merge-tile__icon .notation-svg--token,
.merge-tile__icon .notation-svg--merge {
  width: 100% !important;
  height: 100% !important;
  min-width: 0 !important;
  min-height: 0 !important;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.merge-tile__icon .token-icon {
  align-items: center;
}

/* Bravura viewBox 有留白 —放大 glyph 視覺尺寸 */
.merge-tile__icon .notation-svg {
  width: 100% !important;
  height: 100% !important;
  transform: scale(1.55);
  transform-origin: center center;
}

.merge-tile__label {
  flex: 0 0 auto;
  font-size: clamp(0.5rem, 1.8vh, 0.58rem);
  font-weight: 800;
  color: var(--merge-ink);
  line-height: 1.2;
  text-align: center;
  padding: 0.06rem 0.1rem 0.04rem;
  white-space: nowrap;
}

/* Whole note reveal animation */
.merge-tile--whole {
  z-index: 4;
  border-width: 3px;
  animation: merge-whole-reveal 0.35s ease forwards;
}

.merge-tile--whole-glow {
  box-shadow:
    0 0 0 4px rgba(255, 238, 88, 0.55),
    0 0 18px rgba(255, 193, 7, 0.65),
    0 4px 0 rgba(0, 0, 0, 0.12);
}

.merge-tile--whole-burst {
  animation: merge-whole-burst 0.55s ease forwards;
}

@keyframes merge-whole-reveal {
  0% { transform: scale(0.5); opacity: 0.4; }
  60% { transform: scale(1.12); opacity: 1; }
  100% { transform: scale(1.08); opacity: 1; }
}

@keyframes merge-whole-burst {
  0% { transform: scale(1.08); opacity: 1; filter: brightness(1); }
  40% { transform: scale(1.15); opacity: 1; filter: brightness(1.15); }
  100% { transform: scale(0.2); opacity: 0; filter: brightness(1.4); }
}

.merge-spark {
  position: absolute;
  font-size: 0.85rem;
  color: #fbc02d;
  font-weight: 700;
  pointer-events: none;
  z-index: 5;
  animation: merge-spark-fly 0.6s ease forwards;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

@keyframes merge-spark-fly {
  0% { transform: translate(0, 0) scale(0.6); opacity: 1; }
  100% { transform: translate(var(--spark-dx, 0), var(--spark-dy, -24px)) scale(1); opacity: 0; }
}

.merge-score-pop {
  position: absolute;
  font-size: 0.9rem;
  font-weight: 800;
  color: #e65100;
  pointer-events: none;
  z-index: 6;
  animation: merge-score-pop 0.75s ease forwards;
  text-shadow: 0 1px 0 #fff;
}

@keyframes merge-score-pop {
  0% { transform: translateY(0) scale(0.8); opacity: 0; }
  20% { opacity: 1; transform: translateY(-4px) scale(1); }
  100% { transform: translateY(-28px) scale(1.05); opacity: 0; }
}

.merge-message {
  width: 100%;
  min-height: 0;
  margin: 0;
  text-align: center;
  font-size: clamp(0.75rem, 2.1vh, 0.85rem);
  font-weight: 700;
  color: var(--merge-ink);
}

.merge-message--win {
  color: #2e7d32;
}

.merge-message--over {
  color: #c62828;
}

.merge-actions {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.25rem;
}

/* Panel buttons — sized for sidebar / overlay, not cover hero buttons */
.merge-btn {
  display: block;
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
  max-width: 100%;
  margin: 0;
  padding: 0.55rem 0.65rem;
  font-family: inherit;
  font-size: clamp(0.8rem, 2.2vh, 0.9rem);
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  border-radius: 0.5rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 0.08s, box-shadow 0.08s, filter 0.12s;
}

.merge-btn--primary {
  color: #fff;
  background: linear-gradient(180deg, #66bb6a 0%, #43a047 100%);
  border: 2px solid #2e7d32;
  box-shadow: 0 3px 0 #1b5e20;
}

.merge-btn--primary:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #1b5e20;
}

.merge-btn--end {
  color: #fff;
  background: linear-gradient(180deg, #66bb6a 0%, #43a047 100%);
  border: 2px solid #2e7d32;
  box-shadow: 0 3px 0 #1b5e20;
}

.merge-btn--end:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #1b5e20;
}

.merge-btn--secondary {
  color: #fff;
  background: #2a4a6a;
  border: 2px solid #1a2a3a;
  box-shadow: 0 3px 0 #0d1a26;
}

.merge-btn--secondary:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #0d1a26;
}

.merge-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(62, 39, 35, 0.45);
  border-radius: 0.75rem;
  z-index: 8;
}

.merge-overlay[hidden] {
  display: none;
}

.merge-overlay__card {
  background: #fff;
  border-radius: 0.75rem;
  padding: clamp(0.75rem, 2vmin, 1rem) clamp(0.85rem, 2.2vmin, 1.1rem);
  text-align: center;
  width: min(88%, 16rem);
  max-width: 16rem;
  box-sizing: border-box;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  border: 3px solid #ffcc80;
}

.merge-overlay__title {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--merge-ink);
  line-height: 1.4;
}

.merge-overlay__text {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  color: #78909c;
  line-height: 1.5;
  white-space: pre-line;
}

.merge-overlay__actions {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  width: 100%;
}

.merge-hint {
  width: 100%;
  margin: 0;
  text-align: center;
  font-size: clamp(0.7rem, 1.9vh, 0.78rem);
  font-weight: 600;
  color: var(--merge-ink-soft);
  line-height: 1.4;
}

@media (orientation: landscape) and (max-height: 520px) {
  .merge-panel {
    --merge-rail-width: clamp(168px, 28vw, 210px);
    --merge-board-size: min(360px, 88vh);
    padding-top: max(4px, env(safe-area-inset-top));
    padding-bottom: max(4px, env(safe-area-inset-bottom));
  }

  .merge-board {
    gap: 0.35rem;
    padding: 0.4rem;
  }
}

@media (max-width: 900px) and (orientation: portrait) {
  .merge-body {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }

  .merge-board-wrap {
    width: min(360px, 92vw);
    margin: 0 auto;
  }

  .merge-sidebar {
    max-height: 42vh;
  }
}