/* Dark Theme with Golden Ratio Accent */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --accent: #D4AF37;
    --accent-glow: rgba(212, 175, 55, 0.3);
    --border: #2a2a35;
    --success: #22c55e;
    --warning: #f59e0b;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-radius: 15px;
    margin-bottom: 30px;
    border: 1px solid var(--border);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent) 0%, #f4d03f 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.main-content {
    display: grid;
    grid-template-columns: 300px 1fr 320px;
    gap: 20px;
    margin-bottom: 30px;
}

/* Panel Styles */
.control-panel,
.properties-panel {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border);
    height: fit-content;
}

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

.panel-section:last-child {
    margin-bottom: 0;
}

.panel-section h3 {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 8px;
}

/* Solid Selector */
.solid-selector {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.solid-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.solid-btn:hover {
    border-color: var(--accent);
    background: rgba(212, 175, 55, 0.1);
}

.solid-btn.active {
    border-color: var(--accent);
    background: var(--accent-glow);
    box-shadow: 0 0 15px var(--accent-glow);
}

.solid-icon {
    width: 30px;
    height: 30px;
}

.solid-icon svg {
    width: 100%;
    height: 100%;
}

/* Mode Selector */
.mode-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.mode-btn {
    padding: 10px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
}

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

.mode-btn.active {
    border-color: var(--accent);
    background: var(--accent-glow);
}

/* Animation Controls */
.animation-controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

.toggle-label:hover {
    background: var(--bg-tertiary);
}

.toggle-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
    accent-color: var(--accent);
}

/* Canvas Container */
.canvas-container {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 2px solid var(--border);
    overflow: hidden;
    min-height: 600px;
}

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

.canvas-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(10, 10, 15, 0.9);
    padding: 15px 20px;
    border-radius: 10px;
    border: 1px solid var(--accent);
    backdrop-filter: blur(10px);
}

.solid-name {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    margin-bottom: 5px;
}

.solid-formula {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

/* Properties Panel */
.properties-grid {
    display: grid;
    gap: 10px;
}

.property-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    border-left: 3px solid var(--accent);
}

.property-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.property-value {
    color: var(--accent);
    font-weight: bold;
    font-size: 0.95rem;
}

/* Symmetry Info */
.symmetry-info {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
}

.symmetry-name {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: bold;
}

.symmetry-order {
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.symmetry-axes {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.axis-item {
    padding: 5px 10px;
    background: var(--bg-secondary);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Dual Info */
.dual-info {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
}

.dual-name {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: bold;
}

.dual-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Formula Display */
.formula-display {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    color: var(--accent);
    font-size: 1rem;
    text-align: center;
    border: 1px solid var(--border);
}

/* Golden Ratio Section */
.golden-ratio {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1) 0%, rgba(244, 208, 63, 0.05) 100%);
    border: 2px solid var(--accent);
}

.golden-info {
    padding: 10px;
}

.golden-value {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: bold;
}

.golden-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 30px;
}

footer strong {
    color: var(--accent);
}

/* Responsive Design */
@media (max-width: 1400px) {
    .main-content {
        grid-template-columns: 280px 1fr 280px;
    }
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .canvas-container {
        min-height: 500px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .solid-selector,
    .mode-selector {
        grid-template-columns: 1fr;
    }

    .canvas-overlay {
        top: 10px;
        left: 10px;
        padding: 10px 15px;
    }

    .solid-name {
        font-size: 1.2rem;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #f4d03f;
}

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

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}