/* MIT-Harvard Network Visualization - Main Styles */

:root {
    /* Colors */
    --bg-primary: #000000;
    --bg-secondary: #000000;
    --bg-tertiary: #1a1a1a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #333333;
    --success: #22c55e;
    --warning: #f59e0b;

    /* Sizing */
    --header-height: 56px;
    --sidebar-width: 280px;
    --legend-height: 48px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.header-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.dataset-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dataset-selector label {
    color: var(--text-secondary);
    font-size: 13px;
}

.dataset-selector select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
}

.dataset-selector select:focus {
    outline: none;
    border-color: var(--accent);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.stats {
    display: flex;
    gap: 16px;
}

.stat {
    color: var(--text-secondary);
    font-size: 13px;
}

.stat-value {
    color: var(--text-primary);
    font-weight: 600;
}

/* Main Container */
.main-container {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* Sidebars */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid #ffffff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-right {
    border-right: none;
    border-left: 1px solid #ffffff;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 10;
}

.sidebar-right.open {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 15px;
    font-weight: 600;
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#network-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 100;
    opacity: 1;
    transition: opacity var(--transition-normal);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 50;
    max-width: 280px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tooltip.visible {
    opacity: 1;
}

.tooltip-name {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}

.tooltip-department {
    color: var(--text-secondary);
    font-size: 12px;
    margin-bottom: 8px;
}

.tooltip-stats {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

/* Zoom Controls */
.zoom-controls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 20;
}

.zoom-btn {
    width: 36px;
    height: 36px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.zoom-btn:hover {
    background: var(--bg-tertiary);
}

/* Legend - hidden */
.legend {
    display: none;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    opacity: 1;
    transition: opacity var(--transition-fast);
    white-space: nowrap;
}

.legend-item.disabled {
    opacity: 0.4;
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-label {
    font-size: 11px;
    color: var(--text-secondary);
}

/* Buttons */
.btn-text {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 12px;
    cursor: pointer;
    padding: 4px 8px;
}

.btn-text:hover {
    color: var(--accent-hover);
}

.btn-small {
    font-size: 11px;
    padding: 2px 6px;
}

.btn-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
}

.btn-close:hover {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar-left {
        width: 240px;
    }

    .sidebar-right {
        width: 300px;
    }
}

@media (max-width: 768px) {
    .sidebar-left {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 10;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }

    .sidebar-left.open {
        transform: translateX(0);
    }

    .header-title {
        font-size: 16px;
    }

    .stats {
        display: none;
    }
}