/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --bg-dark: rgba(15, 23, 42, 0.95);
    --bg-glass: rgba(30, 41, 59, 0.85);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.2);
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --radius: 12px;
}

/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

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

/* Control Panel */
#control-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 280px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    z-index: 100;
    box-shadow: var(--shadow);
}

#control-panel::-webkit-scrollbar {
    width: 6px;
}

#control-panel::-webkit-scrollbar-track {
    background: transparent;
}

#control-panel::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

#control-panel h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Control Groups */
.control-group {
    margin-bottom: 18px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border-color);
}

.control-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.control-group > label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 6px;
    opacity: 0.8;
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    margin: 8px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.6);
}

#size-value {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* Number Input */
input[type="number"] {
    width: 50px;
    padding: 6px 8px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-align: center;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Color Input */
input[type="color"] {
    width: 40px;
    height: 32px;
    padding: 2px;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    vertical-align: middle;
    margin-right: 10px;
}

/* Expansion Controls */
.expansion-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.expansion-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.expansion-item span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* Buttons */
.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), #059669);
    color: white;
    width: 100%;
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #dc2626);
    color: white;
    width: 100%;
}

.btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-small:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Toggle Buttons */
.toggle-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn-toggle {
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    flex: 1;
    min-width: 70px;
}

.btn-toggle.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-color: transparent;
}

.btn-toggle:hover {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
}

.btn-toggle.active:hover {
    background: linear-gradient(135deg, var(--primary-hover), #4338ca);
}

/* View Buttons */
.view-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.view-btn {
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.view-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: transparent;
}

/* Cross Section Controls */
.cross-section-controls {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border-color);
}

.clip-axis {
    display: flex;
    gap: 6px;
    margin-top: 10px;
}

.clip-axis-btn {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.clip-axis-btn.active {
    background: var(--secondary-color);
    color: white;
    border-color: transparent;
}

/* Info Panel */
#info-panel {
    position: fixed;
    bottom: 20px;
    left: 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 16px 20px;
    z-index: 100;
    min-width: 180px;
}

#info-panel p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 4px 0;
}

#info-panel span {
    color: var(--text-primary);
    font-weight: 500;
}

#atom-info {
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

#atom-info h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--primary-color);
}

/* Legend */
#legend {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 14px 18px;
    z-index: 100;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 6px 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.legend-color.vertex {
    background: linear-gradient(135deg, #f97316, #ea580c);
}

.legend-color.face {
    background: linear-gradient(135deg, #22c55e, #16a34a);
}

.legend-color.body {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

.legend-color.internal {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
}

/* Structure Type Buttons */
.structure-buttons {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.btn-structure {
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 10px 12px;
    font-size: 0.85rem;
    text-align: left;
}

.btn-structure.active {
    background: linear-gradient(135deg, var(--secondary-color), #059669);
    color: white;
    border-color: transparent;
}

.btn-structure:hover:not(.active) {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--secondary-color);
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.7;
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px var(--primary-color);
    }
    50% {
        box-shadow: 0 0 20px var(--primary-color), 0 0 40px var(--primary-color);
    }
}

/* Responsive Design - Tablet */
@media (max-width: 1024px) {
    #control-panel {
        width: 260px;
        padding: 16px;
    }
    
    .control-group > label {
        font-size: 0.8rem;
    }
    
    .btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
}

/* Responsive Design - Mobile */
@media (max-width: 768px) {
    #control-panel {
        position: fixed;
        width: 100%;
        max-width: 100%;
        max-height: 45vh;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        border-radius: var(--radius) var(--radius) 0 0;
        padding: 16px;
        padding-bottom: 24px;
    }
    
    #control-panel h2 {
        font-size: 1rem;
        margin-bottom: 14px;
        padding-bottom: 8px;
    }
    
    .control-group {
        margin-bottom: 12px;
        padding-bottom: 12px;
    }
    
    .control-group > label {
        font-size: 0.75rem;
        margin-bottom: 8px;
    }
    
    .structure-buttons {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .btn-structure {
        flex: 1;
        min-width: calc(33% - 4px);
        padding: 8px 6px;
        font-size: 0.75rem;
        text-align: center;
    }
    
    .expansion-controls {
        gap: 8px;
    }
    
    .expansion-item span {
        font-size: 0.8rem;
    }
    
    input[type="number"] {
        width: 45px;
        padding: 5px 6px;
        font-size: 0.85rem;
    }
    
    .toggle-buttons {
        gap: 6px;
    }
    
    .btn-toggle {
        padding: 8px 10px;
        font-size: 0.75rem;
        min-width: 60px;
    }
    
    .view-buttons {
        grid-template-columns: repeat(4, 1fr);
        gap: 4px;
    }
    
    .btn-small {
        padding: 6px 10px;
        font-size: 0.75rem;
    }
    
    .clip-axis {
        gap: 4px;
    }
    
    #info-panel {
        position: fixed;
        top: 10px;
        left: 10px;
        bottom: auto;
        padding: 10px 14px;
        min-width: auto;
        max-width: 160px;
        font-size: 0.75rem;
    }
    
    #info-panel p {
        font-size: 0.75rem;
        margin: 2px 0;
    }
    
    #atom-info {
        margin-bottom: 8px;
        padding-bottom: 8px;
    }
    
    #atom-info h3 {
        font-size: 0.8rem;
        margin-bottom: 4px;
    }
    
    #legend {
        position: fixed;
        top: 10px;
        right: 10px;
        bottom: auto;
        padding: 10px 12px;
    }
    
    .legend-item {
        font-size: 0.7rem;
        gap: 6px;
        margin: 4px 0;
    }
    
    .legend-color {
        width: 10px;
        height: 10px;
    }
    
    /* Touch-friendly improvements */
    input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }
    
    .hint {
        font-size: 0.7rem;
    }
}

/* Responsive Design - Small Mobile */
@media (max-width: 480px) {
    #control-panel {
        max-height: 50vh;
        padding: 12px;
        padding-bottom: 20px;
    }
    
    #control-panel h2 {
        font-size: 0.9rem;
    }
    
    .structure-buttons {
        flex-direction: column;
    }
    
    .btn-structure {
        min-width: 100%;
        text-align: left;
    }
    
    .view-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    #info-panel,
    #legend {
        max-width: 140px;
        padding: 8px 10px;
    }
    
    .legend-item span {
        display: none;
    }
    
    .legend-item::after {
        content: attr(data-short);
        font-size: 0.65rem;
    }
}

/* Landscape mode on mobile */
@media (max-height: 500px) and (orientation: landscape) {
    #control-panel {
        max-height: 60vh;
        width: 280px;
        left: auto;
        right: 10px;
        bottom: 10px;
        border-radius: var(--radius);
    }
    
    #info-panel {
        top: 10px;
        left: 10px;
    }
    
    #legend {
        top: 10px;
        right: 300px;
    }
}