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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --text-primary: #e0e0ff;
    --text-secondary: #a0a0c0;
    --accent: #4466ff;
    --accent-glow: rgba(68, 102, 255, 0.3);
    --success: #44ff88;
    --warning: #ffaa44;
    --danger: #ff4466;
    --border: #2a2a3a;
}

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

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(68, 102, 255, 0.1);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #4466ff, #88aaff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.main-content {
    display: flex;
    flex: 1;
    gap: 1rem;
    padding: 1rem;
    flex-wrap: wrap;
}

.canvas-container {
    flex: 1;
    min-width: 300px;
    position: relative;
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
}

#holonomyCanvas {
    width: 100%;
    height: 600px;
    display: block;
}

.canvas-overlay {
    position: absolute;
    top: 1rem;
    left: 1rem;
    pointer-events: none;
}

.holonomy-display {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 4px 20px rgba(68, 102, 255, 0.2);
}

.holonomy-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

#holonomyAngle {
    font-size: 1.5rem;
    color: var(--success);
}

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

.controls-panel {
    width: 400px;
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    max-height: 600px;
    overflow-y: auto;
}

.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

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

.control-group {
    margin-bottom: 1.5rem;
}

.control-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.control-select {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.control-select:hover,
.control-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    outline: none;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background 0.2s ease;
}

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

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

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

.control-slider {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.control-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: all 0.2s ease;
}

.control-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #6688ff);
    color: white;
    box-shadow: 0 4px 15px rgba(68, 102, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(68, 102, 255, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.info-panel,
.explanation-panel {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
    border: 1px solid var(--border);
}

.info-panel h3,
.explanation-panel h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--accent);
}

.info-content p {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.info-content strong {
    color: var(--text-primary);
}

.explanation-content {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.explanation-content p {
    margin-bottom: 0.75rem;
}

.explanation-content h4 {
    font-size: 0.9rem;
    margin: 1rem 0 0.5rem;
    color: var(--text-primary);
}

.explanation-content ul {
    margin-left: 1.5rem;
    margin-bottom: 0.75rem;
}

.explanation-content li {
    margin-bottom: 0.25rem;
}

.formula {
    background: var(--bg-primary);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 0.75rem;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--accent);
    margin: 0.75rem 0;
    box-shadow: 0 2px 10px rgba(68, 102, 255, 0.1);
}

footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
    }

    .controls-panel {
        width: 100%;
        max-height: none;
    }

    #holonomyCanvas {
        height: 400px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .canvas-container,
    .controls-panel {
        border-radius: 8px;
    }
}

/* Animations */
@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(68, 102, 255, 0.2);
    }
    50% {
        box-shadow: 0 0 40px rgba(68, 102, 255, 0.4);
    }
}

.holonomy-display {
    animation: glow 3s ease-in-out infinite;
}