/* SumNode – Brain Train aesthetic, color palette per number */

.sum-node-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));
}

.sum-node-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;
}

.sum-node-stats span { color: var(--text-secondary, #8B949E); }
.sum-node-stats #score-display,
.sum-node-stats #steps-display { color: var(--accent, #ffae00); }
.sum-node-stats #target-display { color: var(--text-primary, #F8FAFC); }

.sum-node-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;
}

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

.sum-node-wrap {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    touch-action: manipulation;
    padding: 20px;
    border-radius: 12px;
    background: var(--sum-node-bg, #1a1f2e);
    box-shadow: inset 0 0 0 2px var(--border-color, rgba(255,255,255,0.08));
}

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

/* Color palette per number: 1 Grey, 2 Blue, 3 Green, 4 Yellow, 5 Orange... */
.sum-node-tile[data-value="1"]  { background: #94a3b8; color: #0f172a; }   /* Grey */
.sum-node-tile[data-value="2"]  { background: #7dd3fc; color: #0c4a6e; }   /* Blue */
.sum-node-tile[data-value="3"]  { background: #86efac; color: #14532d; }   /* Green */
.sum-node-tile[data-value="4"]  { background: #fde047; color: #713f12; }   /* Yellow */
.sum-node-tile[data-value="5"]  { background: #fdba74; color: #7c2d12; }   /* Orange */
.sum-node-tile[data-value="6"]  { background: #f9a8d4; color: #831843; }   /* Pink */
.sum-node-tile[data-value="7"]  { background: #e9d5ff; color: #581c87; }   /* Lavender */
.sum-node-tile[data-value="8"]  { background: #c4b5fd; color: #4c1d95; }   /* Violet */
.sum-node-tile[data-value="9"]  { background: #a5f3fc; color: #155e75; }   /* Cyan */
.sum-node-tile[data-value="10"] { background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%); color: #451a03; } /* Gold */

/* Fallback for 11+ (small tier) */
.sum-node-tile[data-value="11"],
.sum-node-tile[data-value="12"],
.sum-node-tile[data-value="13"],
.sum-node-tile[data-value="14"],
.sum-node-tile[data-value="15"],
.sum-node-tile[data-value="16"],
.sum-node-tile[data-value="17"],
.sum-node-tile[data-value="18"],
.sum-node-tile[data-value="19"],
.sum-node-tile[data-value="20"] {
    background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
    color: #451a03;
}

/* Dynamic tiers: more intense colors as numbers grow */
.sum-node-tile[data-tier="medium"] {
    background: linear-gradient(135deg, #fb923c 0%, #ea580c 100%);
    color: #431407;
}

.sum-node-tile[data-tier="large"] {
    background: linear-gradient(135deg, #f97316 0%, #c2410c 100%);
    color: #fff7ed;
}

.sum-node-tile[data-tier="xlarge"] {
    background: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
    color: #fef2f2;
}

.sum-node-tile[data-tier="win"] {
    background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
    color: #fef2f2;
    box-shadow: 0 0 16px rgba(220, 38, 38, 0.5);
}

/* Multiplier tiles */
.sum-node-tile[data-tier="multiplier"] {
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    color: #f5f3ff;
    font-size: 1rem;
}

/* 3+ digit numbers: shrink text to fit inside tile (7×7 cells are smaller) */
.sum-node-tile[data-digits="3"] { font-size: 0.9rem; }
.sum-node-tile[data-digits="4"] { font-size: 0.75rem; }

.sum-node-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;
    cursor: pointer;
}

.sum-node-tile[draggable="true"] {
    cursor: grab;
}

.sum-node-tile:hover:not(.empty):not(.dragging) {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.sum-node-tile.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.sum-node-tile.empty {
    background: rgba(255,255,255,0.04);
    cursor: default;
    box-shadow: none;
}

.sum-node-tile.center-cell {
    box-shadow: inset 0 0 0 2px var(--accent, #ffae00);
}

body.light-theme .sum-node-tile.empty {
    background: rgba(0,0,0,0.04);
}

/* Board: 7x7 grid */
.sum-node-board {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(7, 1fr);
    gap: 6px;
    padding: 10px;
    background: rgba(0,0,0,0.15);
    border-radius: 10px;
    width: 336px;
    height: 336px;
}

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

/* Goal path to 1000 */
.sum-node-goal-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 6px;
    justify-content: center;
    margin-top: 12px;
    padding: 10px 12px;
    background: rgba(0,0,0,0.12);
    border-radius: 8px;
    min-height: 36px;
}

body.light-theme .sum-node-goal-list {
    background: rgba(0,0,0,0.06);
}

.sum-node-goal-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 26px;
    padding: 0 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary, #8B949E);
    background: rgba(255,255,255,0.06);
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}

.sum-node-goal-item.selected {
    color: var(--accent, #ffae00);
    background: rgba(255, 174, 0, 0.2);
}

body.light-theme .sum-node-goal-item {
    background: rgba(0,0,0,0.06);
}

body.light-theme .sum-node-goal-item.selected {
    color: #b45309;
    background: rgba(255, 174, 0, 0.25);
}

.sum-node-cell {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    border-radius: 8px;
    min-width: 40px;
    min-height: 40px;
}

.sum-node-cell.slide-left {
    animation: sum-node-slide-left 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-right {
    animation: sum-node-slide-right 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-top {
    animation: sum-node-slide-top 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-bottom {
    animation: sum-node-slide-bottom 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-top-left {
    animation: sum-node-slide-top-left 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-top-right {
    animation: sum-node-slide-top-right 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-bottom-left {
    animation: sum-node-slide-bottom-left 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.sum-node-cell.slide-bottom-right {
    animation: sum-node-slide-bottom-right 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.sum-node-cell.merge-pop {
    animation: sum-node-pop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.sum-node-cell.center-pulse {
    animation: sum-node-pop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards,
               sum-node-center-pulse 0.6s ease-in-out 0.2s;
}

@keyframes sum-node-slide-left {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(0); }
}
@keyframes sum-node-slide-right {
    0% { transform: translateX(100%); }
    100% { transform: translateX(0); }
}
@keyframes sum-node-slide-top {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(0); }
}
@keyframes sum-node-slide-bottom {
    0% { transform: translateY(100%); }
    100% { transform: translateY(0); }
}
@keyframes sum-node-slide-top-left {
    0% { transform: translate(-100%, -100%); }
    100% { transform: translate(0, 0); }
}
@keyframes sum-node-slide-top-right {
    0% { transform: translate(100%, -100%); }
    100% { transform: translate(0, 0); }
}
@keyframes sum-node-slide-bottom-left {
    0% { transform: translate(-100%, 100%); }
    100% { transform: translate(0, 0); }
}
@keyframes sum-node-slide-bottom-right {
    0% { transform: translate(100%, 100%); }
    100% { transform: translate(0, 0); }
}

@keyframes sum-node-pop {
    0% { transform: scale(1.4); }
    70% { transform: scale(1.08); }
    100% { transform: scale(1); }
}

@keyframes sum-node-center-pulse {
    0%, 100% { box-shadow: inset 0 0 0 2px var(--accent, #ffae00), 0 0 0 transparent; }
    50% { box-shadow: inset 0 0 0 2px var(--accent, #ffae00), 0 0 18px 6px rgba(255, 174, 0, 0.5); }
}

/* Game Over overlay */
.sum-node-wrap .game-over-overlay,
.sum-node-wrap .win-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;
}

.sum-node-wrap .game-over-overlay.visible,
.sum-node-wrap .win-overlay.visible {
    display: flex;
}

.sum-node-wrap .game-over-box,
.sum-node-wrap .win-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);
}

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

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

.sum-node-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;
}

.sum-node-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;
}