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

:root {
    --primary: #00d9ff;
    --secondary: #0066ff;
    --accent: #ff00ff;
    --bg: #0a0e1a;
    --surface: rgba(15, 23, 42, 0.95);
    --border: rgba(255, 255, 255, 0.1);
    --text: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.6);
    --success: #00ff88;
    --warning: #ffaa00;
    --danger: #ff0044;
}

body {
    font-family: 'Space Grotesk', sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
}

/* Loading Screen */
#loadingScreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s;
}

#loadingScreen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(0, 217, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 2rem;
}

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

.loading-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.loading-content p {
    color: var(--text-dim);
    margin-bottom: 2rem;
}

.progress-bar {
    width: 300px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    width: 0%;
    transition: width 0.3s;
}

/* Cesium Container */
#cesiumContainer {
    width: 100%;
    height: 100vh;
}

.cesium-viewer-bottom {
    display: none;
}

/* Overlay UI */
.overlay-ui {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.overlay-ui > * {
    pointer-events: auto;
}

/* Top Bar */
.top-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(180deg, var(--surface) 0%, transparent 100%);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo svg {
    color: var(--primary);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.stats-bar {
    display: flex;
    gap: 2rem;
}

.stat-card {
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Sidebar */
.sidebar {
    position: absolute;
    left: 0;
    top: 80px;
    bottom: 0;
    width: 380px;
    background: var(--surface);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s;
    z-index: 99;
}

.sidebar.collapsed {
    transform: translateX(-340px);
}

.sidebar-toggle {
    position: absolute;
    right: -40px;
    top: 20px;
    width: 40px;
    height: 40px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: none;
    border-radius: 0 8px 8px 0;
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.sidebar-toggle:hover {
    background: rgba(0, 217, 255, 0.1);
    color: var(--primary);
}

.sidebar-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
}

.search-section {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-section input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.875rem;
    transition: all 0.3s;
}

.search-section input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-dim);
}

.categories-section {
    margin-bottom: 1.5rem;
}

.categories-section h3,
.satellites-section h3 {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    color: var(--text-dim);
    margin-bottom: 1rem;
}

#categoryFilters {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-filter {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.category-filter:hover {
    background: rgba(255, 255, 255, 0.08);
}

.category-filter.active {
    border-color: var(--primary);
    background: rgba(0, 217, 255, 0.1);
}

.category-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.category-filter.active .category-checkbox {
    background: var(--primary);
    border-color: var(--primary);
}

.category-checkbox::after {
    content: '✓';
    color: var(--bg);
    font-size: 0.75rem;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.3s;
}

.category-filter.active .category-checkbox::after {
    opacity: 1;
}

.category-info {
    flex: 1;
}

.category-name {
    font-weight: 500;
    font-size: 0.875rem;
}

.category-count {
    font-size: 0.75rem;
    color: var(--text-dim);
}

.category-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: 0 0 10px currentColor;
}

.satellites-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.satellite-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.loading-satellites {
    padding: 2rem;
    text-align: center;
    color: var(--text-dim);
}

.satellite-item {
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.satellite-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    transform: translateX(4px);
}

.satellite-item.selected {
    border-color: var(--primary);
    background: rgba(0, 217, 255, 0.1);
}

.satellite-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.satellite-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.satellite-name {
    flex: 1;
    font-weight: 500;
    font-size: 0.875rem;
}

.satellite-details {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* Info Panel */
.info-panel {
    position: absolute;
    top: 100px;
    right: 20px;
    width: 350px;
    max-height: calc(100vh - 120px);
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transform: translateX(400px);
    transition: transform 0.3s;
    z-index: 98;
}

.info-panel.active {
    transform: translateX(0);
}

.info-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 217, 255, 0.05);
}

.info-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.3s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text);
}

.info-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(100vh - 220px);
}

.info-placeholder {
    text-align: center;
    color: var(--text-dim);
    padding: 2rem 0;
}

/* Satellite Image */
.satellite-image-container {
    position: relative;
    width: 100%;
    height: 200px;
    margin-bottom: 1.5rem;
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(0, 102, 255, 0.1));
}

.satellite-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    transition: transform 0.3s ease;
}

.satellite-image-container:hover .satellite-image {
    transform: scale(1.05);
}

.satellite-image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-dim);
    font-size: 0.875rem;
}

.info-value {
    font-weight: 500;
    font-size: 0.875rem;
    text-align: right;
}

/* Controls */
.controls {
    position: absolute;
    bottom: 30px;
    right: 30px;
    display: flex;
    gap: 0.5rem;
    z-index: 97;
}

.control-btn {
    width: 50px;
    height: 50px;
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.control-btn:hover {
    background: rgba(0, 217, 255, 0.2);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

#speedText {
    font-weight: 600;
    font-size: 0.875rem;
}

/* Legend */
.legend {
    position: absolute;
    bottom: 30px;
    left: 30px;
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    z-index: 96;
}

.legend-title {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    color: var(--text-dim);
    margin-bottom: 0.75rem;
}

#legendItems {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: 0 0 8px currentColor;
}

.legend-label {
    font-size: 0.875rem;
}

/* Scrollbar */
.satellite-list::-webkit-scrollbar,
.info-body::-webkit-scrollbar {
    width: 6px;
}

.satellite-list::-webkit-scrollbar-track,
.info-body::-webkit-scrollbar-track {
    background: transparent;
}

.satellite-list::-webkit-scrollbar-thumb,
.info-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.satellite-list::-webkit-scrollbar-thumb:hover,
.info-body::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 320px;
    }
    
    .sidebar.collapsed {
        transform: translateX(-280px);
    }
    
    .stats-bar {
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .top-bar {
        padding: 0 1rem;
    }
    
    .logo-text span {
        display: none;
    }
    
    .sidebar {
        width: 100%;
        max-width: 320px;
    }
    
    .sidebar.collapsed {
        transform: translateX(-100%);
    }
    
    .info-panel {
        right: 10px;
        left: 10px;
        width: auto;
    }
    
    .controls {
        right: 10px;
        bottom: 20px;
    }
    
    .legend {
        left: 10px;
        bottom: 20px;
    }
}