/* Universe Mode */
.universe-mode {
    background: #0a0e17;
    color: #e0e0ff;
    overflow: hidden;
    height: 100vh;
    margin: 0;
    font-family: 'Segoe UI', 'Roboto Mono', monospace;
}

.universe-container {
    position: relative;
    z-index: 1;
    padding: 0;
    height: calc(100vh - 60px);
}

/* Canvas */
#universe-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Control Panel */
.universe-controls {
    position: fixed;
    top: 80px;
    right: 20px;
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid #2a4365;
    border-radius: 12px;
    padding: 20px;
    width: 320px;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transform: translateX(400px);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.universe-controls.visible {
    transform: translateX(0);
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #2a4365;
    padding-bottom: 10px;
}

.controls-header h3 {
    margin: 0;
    color: #63b3ed;
    font-size: 18px;
}

.close-controls {
    background: none;
    border: none;
    color: #cbd5e0;
    font-size: 24px;
    cursor: pointer;
    padding: 0 10px;
}

.close-controls:hover {
    color: #fff;
}

.controls-section {
    margin-bottom: 25px;
}

.controls-section h4 {
    color: #90cdf4;
    margin-bottom: 15px;
    font-size: 16px;
    border-left: 3px solid #4299e1;
    padding-left: 10px;
}

.control-group {
    margin-bottom: 15px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: #cbd5e0;
    font-size: 14px;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: #2d3748;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: #4299e1;
    border-radius: 50%;
    cursor: pointer;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    background: rgba(66, 153, 225, 0.1);
    border: 1px solid #4299e1;
    color: #90cdf4;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s;
}

.filter-btn:hover,
.filter-btn.active {
    background: #4299e1;
    color: white;
}

.action-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: bold;
    cursor: pointer;
    margin-bottom: 10px;
    transition: transform 0.3s;
}

.action-btn:hover {
    transform: translateY(-2px);
}

/* Knowledge Panel */
.knowledge-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 800px;
    max-width: 90vw;
    max-height: 80vh;
    background: rgba(15, 23, 42, 0.98);
    border: 2px solid #4fd1c7;
    border-radius: 16px;
    z-index: 2000;
    backdrop-filter: blur(20px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.knowledge-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.knowledge-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: linear-gradient(90deg, #0f172a, #1e293b);
    border-bottom: 1px solid #334155;
}

.knowledge-header h3 {
    margin: 0;
    color: #4fd1c7;
    font-size: 24px;
    text-shadow: 0 0 10px rgba(79, 209, 199, 0.3);
}

.close-knowledge {
    background: none;
    border: none;
    color: #cbd5e0;
    font-size: 32px;
    cursor: pointer;
    padding: 0 15px;
    line-height: 1;
}

.close-knowledge:hover {
    color: #fff;
}

.knowledge-content {
    padding: 30px;
    overflow-y: auto;
    max-height: calc(80vh - 140px);
    color: #e2e8f0;
    line-height: 1.6;
}

.knowledge-content h4 {
    color: #63b3ed;
    margin-top: 25px;
    margin-bottom: 15px;
    font-size: 18px;
}

.knowledge-content ul {
    padding-left: 20px;
    margin-bottom: 20px;
}

.knowledge-content li {
    margin-bottom: 8px;
    position: relative;
}

.knowledge-content li:before {
    content: "⟡";
    color: #4299e1;
    position: absolute;
    left: -20px;
}

.knowledge-content code {
    background: rgba(66, 153, 225, 0.1);
    color: #90cdf4;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Consolas', monospace;
    font-size: 14px;
}

.knowledge-content pre {
    background: #1a202c;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    border-left: 4px solid #4299e1;
}

.knowledge-footer {
    padding: 15px 30px;
    background: rgba(30, 41, 59, 0.8);
    border-top: 1px solid #334155;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.difficulty {
    display: flex;
    align-items: center;
    gap: 10px;
}

.diff-stars {
    color: #f6ad55;
    font-size: 18px;
}

.related-concepts {
    color: #cbd5e0;
}

.related-concepts span {
    color: #68d391;
    cursor: pointer;
    text-decoration: underline;
    margin-left: 5px;
}

/* Floating Concepts */
.concept-node {
    position: absolute;
    cursor: pointer;
    z-index: 100;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 0 10px currentColor);
}

.concept-icon {
    font-size: 48px;
    text-align: center;
    transition: transform 0.3s;
}

.concept-label {
    margin-top: 10px;
    padding: 8px 16px;
    background: rgba(15, 23, 42, 0.9);
    border: 2px solid currentColor;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
    white-space: nowrap;
    color: white;
    backdrop-filter: blur(5px);
}

.concept-node:hover .concept-icon {
    transform: scale(1.2) rotate(15deg);
}

.concept-node:hover .concept-label {
    transform: scale(1.1);
}

/* Concept Colors by Category */
.concept-node[data-category="consensus"] {
    color: #f56565;
}

.concept-node[data-category="storage"] {
    color: #48bb78;
}

.concept-node[data-category="messaging"] {
    color: #4299e1;
}

.concept-node[data-category="coordination"] {
    color: #9f7aea;
}

.concept-node[data-category="architecture"] {
    color: #ed8936;
}

.concept-node[data-category="patterns"] {
    color: #38b2ac;
}

/* Connections */
.connection-line {
    position: absolute;
    background: linear-gradient(90deg, transparent, currentColor, transparent);
    height: 2px;
    pointer-events: none;
    z-index: 50;
    opacity: 0.3;
    transition: opacity 0.3s;
}

.connection-line.active {
    opacity: 0.8;
    height: 3px;
}

/* Particles */
.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: #fff;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .universe-controls {
        width: calc(100vw - 40px);
        right: 20px;
        left: 20px;
        transform: translateY(100vh);
    }

    .universe-controls.visible {
        transform: translateY(0);
    }

    .knowledge-panel {
        width: 95vw;
        max-height: 85vh;
    }

    .knowledge-header h3 {
        font-size: 18px;
    }

    .concept-icon {
        font-size: 32px;
    }

    .concept-label {
        font-size: 12px;
        padding: 6px 12px;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

@keyframes shimmer {
    0% { background-position: -200px 0; }
    100% { background-position: calc(200px + 100%) 0; }
}

.pulse {
    animation: pulse 2s infinite;
}

.float {
    animation: float 6s ease-in-out infinite;
}

.shimmer {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    background-size: 200px 100%;
    animation: shimmer 3s infinite;
}