:root {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-border: #334155;
    --color-accent-yellow: #fbbf24;
    --color-accent-purple: #a855f7;
    --color-accent-green: #10b981;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Pixel-perfect rendering for all images (Minecraft textures) */
img {
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-crisp-edges;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    -ms-interpolation-mode: nearest-neighbor;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, rgba(31, 41, 55, 0.8), rgba(17, 24, 39, 0.8));
    border: 1px solid rgba(75, 85, 99, 0.5);
    color: var(--color-text-secondary);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

.tab-btn:hover {
    background: linear-gradient(135deg, rgba(55, 65, 81, 0.9), rgba(31, 41, 55, 0.9));
    border-color: rgba(156, 163, 175, 0.7);
    color: var(--color-text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.2);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--color-accent-yellow), #f59e0b);
    border-color: var(--color-accent-yellow);
    color: #1f2937;
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.4);
}

#treeCanvas {
    display: block;
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-crisp-edges;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    -ms-interpolation-mode: nearest-neighbor;
}

.advancement-node {
    position: absolute;
    width: 32px;
    height: 32px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.advancement-node:hover {
    transform: scale(1.15);
    filter: drop-shadow(0 0 8px rgba(251, 191, 36, 0.6));
}

.advancement-node.unlocked {
    filter: brightness(1.2);
}

.advancement-node.locked {
    filter: grayscale(0.8) brightness(0.6);
}

.advancement-frame-regular {
    border: 2px solid #8b7355;
}

.advancement-frame-goal {
    border: 2px solid #a855f7;
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.4);
}

.advancement-frame-challenge {
    border: 2px solid #ef4444;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.5);
    animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 12px rgba(239, 68, 68, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(239, 68, 68, 0.8);
    }
}

#advancementModal {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-player-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(31, 41, 55, 0.5);
    border: 1px solid rgba(75, 85, 99, 0.3);
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.modal-player-item:hover {
    background: rgba(55, 65, 81, 0.6);
    border-color: rgba(156, 163, 175, 0.5);
    transform: translateX(4px);
}

.player-name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.player-date {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(17, 24, 39, 0.5);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #4b5563, #374151);
    border-radius: 5px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #6b7280, #4b5563);
    background-clip: padding-box;
}

@media (max-width: 768px) {
    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
    
    #treeViewport {
        height: 400px !important;
    }
}

.connection-line {
    stroke-width: 2;
    stroke-linecap: round;
}

.connection-line.unlocked {
    stroke: var(--color-accent-green);
    opacity: 0.8;
}

.connection-line.locked {
    stroke: var(--color-border);
    opacity: 0.4;
    stroke-dasharray: 4, 4;
}

.tooltip {
    position: absolute;
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid var(--color-accent-yellow);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--color-text-primary);
    font-size: 0.875rem;
    pointer-events: none;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    max-width: 250px;
}

.tooltip-title {
    font-weight: 700;
    color: var(--color-accent-yellow);
    margin-bottom: 0.25rem;
}

.tooltip-desc {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}