/* Number Drop Merge – Brain Train aesthetic, pastel tile colors */

.number-drop-content {
    background: var(--surface-color, #161B22);
    color: var(--text-primary, #F8FAFC);
    font-family: 'Segoe UI', system-ui, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color, rgba(255,255,255,0.1));
}

.number-drop-stats {
    margin-bottom: 16px;
    font-size: 1.1rem;
    color: var(--text-primary, #F8FAFC);
    font-weight: 600;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.number-drop-stats span { color: var(--text-secondary, #8B949E); }
.number-drop-stats #score-display,
.number-drop-stats #high-score-display { color: var(--accent, #ffae00); }

.number-drop-btn {
    padding: 8px 18px;
    font-size: 0.95rem;
    border-radius: 8px;
    border: 2px solid var(--border-color, rgba(255,255,255,0.2));
    background: var(--button-bg, #282828);
    color: var(--accent, #ffae00);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.number-drop-btn:hover {
    border-color: var(--accent, #ffae00);
    background: rgba(255, 174, 0, 0.15);
}

.number-drop-wrap {
    position: relative; /* for absolute positioning of current tile */
    display: inline-block;
    touch-action: none;
    padding: 20px;
    border-radius: 12px;
    background: var(--number-drop-bg, #1a1f2e);
    box-shadow: inset 0 0 0 2px var(--border-color, rgba(255,255,255,0.08));
}

body.light-theme .number-drop-wrap {
    background: var(--number-drop-bg, #e8ecf4);
}

/* Pastel colors per number (power of 2) */
.number-drop-tile[data-value="2"]   { background: #7dd3fc; color: #0c4a6e; }   /* Light Blue */
.number-drop-tile[data-value="4"]   { background: #99f6e4; color: #134e4a; }   /* Mint */
.number-drop-tile[data-value="8"]   { background: #fed7aa; color: #7c2d12; }   /* Peach */
.number-drop-tile[data-value="16"]  { background: #fecdd3; color: #881337; }   /* Rose */
.number-drop-tile[data-value="32"]  { background: #e9d5ff; color: #581c87; }   /* Lavender */
.number-drop-tile[data-value="64"]  { background: #c4b5fd; color: #4c1d95; }   /* Violet */
.number-drop-tile[data-value="128"] { background: #a5f3fc; color: #155e75; }   /* Cyan */
.number-drop-tile[data-value="256"] { background: #bbf7d0; color: #14532d; }   /* Green */
.number-drop-tile[data-value="512"] { background: #fde68a; color: #713f12; }   /* Amber */
.number-drop-tile[data-value="1024"]{ background: #fbcfe8; color: #831843; }   /* Pink */
.number-drop-tile[data-value="2048"]{ background: #fcd34d; color: #78350f; }   /* Gold */
.number-drop-tile[data-value="4096"]{ background: #a78bfa; color: #4c1d95; }   /* Purple */

/* Fallback for higher values */
.number-drop-tile[data-value="8192"],
.number-drop-tile[data-value="16384"],
.number-drop-tile[data-value="32768"],
.number-drop-tile[data-value="65536"] {
    background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
    color: #451a03;
}

.number-drop-tile {
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

/* Current tile (follows mouse) */
.number-drop-current {
    position: absolute;
    width: 52px;
    height: 52px;
    font-size: 1.5rem;
    z-index: 20;
    pointer-events: none;
    transform: translate(-50%, -50%);
}

/* Board: 5 columns x 7 rows */
.number-drop-board {
    display: flex;
    gap: 6px;
    padding: 8px;
    background: rgba(0,0,0,0.15);
    border-radius: 10px;
}

body.light-theme .number-drop-board {
    background: rgba(0,0,0,0.06);
}

.number-drop-column {
    display: flex;
    flex-direction: column-reverse;
    gap: 6px;
    width: 56px;
    min-height: 420px;
    padding: 6px;
    background: rgba(255,255,255,0.04);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s ease;
}

body.light-theme .number-drop-column {
    background: rgba(0,0,0,0.04);
}

.number-drop-column:hover {
    background: rgba(255, 174, 0, 0.12);
}

body.light-theme .number-drop-column:hover {
    background: rgba(255, 174, 0, 0.2);
}

.number-drop-column.full {
    cursor: not-allowed;
    opacity: 0.6;
}

.number-drop-column.full:hover {
    background: rgba(255, 100, 100, 0.2);
}

.number-drop-cell {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    border-radius: 10px;
}

.number-drop-cell.slide-down {
    animation: number-drop-slide 0.25s ease-out;
}

.number-drop-cell.merge-pop {
    animation: number-drop-merge 0.2s ease-out;
}

@keyframes number-drop-slide {
    0% { transform: translateY(-58px); opacity: 0.8; }
    100% { transform: translateY(0); opacity: 1; }
}

@keyframes number-drop-merge {
    0% { transform: scale(1.2); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Game Over overlay */
.number-drop-wrap .game-over-overlay {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    border-radius: 12px;
    align-items: center;
    justify-content: center;
    z-index: 30;
}

.number-drop-wrap .game-over-overlay.visible {
    display: flex;
}

.number-drop-wrap .game-over-box {
    background: var(--surface-color, #161B22);
    color: var(--text-primary, #F8FAFC);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    border: 2px solid var(--accent, #ffae00);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.number-drop-wrap .game-over-box h3 {
    margin: 0 0 12px 0;
    font-size: 1.5rem;
    color: var(--accent, #ffae00);
}

.number-drop-wrap .game-over-box p {
    margin: 0 0 20px 0;
    color: var(--text-secondary, #8B949E);
}

.number-drop-wrap .game-over-btn {
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary, #0F172A);
    background: var(--accent, #ffae00);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.number-drop-wrap .game-over-btn:hover {
    background: #ffc933;
    transform: scale(1.02);
}

.hint {
    color: var(--text-secondary, #8B949E);
    font-size: 0.85rem;
    margin-top: 14px;
    text-align: center;
    max-width: 420px;
}