:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-pink: #ec4899;
    --border-color: #374151;
    --vector-a-color: #3b82f6;
    --vector-b-color: #06b6d4;
    --vector-c-color: #10b981;
    --result-color: #f59e0b;
    --bivector-color: rgba(139, 92, 246, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

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

main {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 20px;
    margin-bottom: 30px;
}

.canvas-container {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

#gaCanvas {
    display: block;
    width: 100%;
    height: auto;
    cursor: crosshair;
}

.canvas-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    max-width: 300px;
}

.grade-display {
    background: rgba(17, 24, 39, 0.95);
    border-radius: 8px;
    padding: 15px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.grade-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-weight: 600;
}

.grade-components {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.8;
}

.grade-component {
    padding: 4px 0;
    border-bottom: 1px solid var(--border-color);
}

.grade-component:last-child {
    border-bottom: none;
}

.scalar-grade { color: var(--accent-green); }
.vector-grade { color: var(--accent-cyan); }
.bivector-grade { color: var(--accent-purple); }
.trivector-grade { color: var(--accent-pink); }

.controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.control-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.control-section h3 {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: var(--accent-cyan);
}

.operation-grid,
.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.op-btn,
.preset-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.op-btn:hover,
.preset-btn:hover {
    background: var(--bg-primary);
    border-color: var(--accent-blue);
}

.op-btn.active {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    border-color: var(--accent-cyan);
    color: white;
}

.op-symbol {
    font-size: 1.5rem;
    font-weight: bold;
}

.op-name {
    font-size: 0.8rem;
}

.vector-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.vector-input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.vector-input-group label {
    min-width: 80px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.vector-input-group input[type="number"] {
    width: 70px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px;
    border-radius: 6px;
    text-align: center;
}

.vector-input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

.animation-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.anim-btn {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
    border: none;
    color: white;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: transform 0.2s;
}

.anim-btn:hover {
    transform: scale(1.02);
}

.anim-btn:active {
    transform: scale(0.98);
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.slider-group label {
    min-width: 120px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.slider-group input[type="range"] {
    flex: 1;
    accent-color: var(--accent-cyan);
}

.slider-group span {
    min-width: 50px;
    text-align: right;
    font-size: 0.9rem;
}

.display-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
}

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

.info-panel {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
}

.info-panel h3 {
    margin-bottom: 15px;
    color: var(--accent-cyan);
}

#operationInfo {
    margin-bottom: 25px;
}

.operation-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--accent-blue);
}

.operation-description {
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.7;
}

.operation-formula {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 15px;
    border-left: 4px solid var(--accent-cyan);
}

.mathematical-detail {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.8;
}

.math-background {
    color: var(--text-secondary);
    line-height: 1.8;
}

.math-background p {
    margin-bottom: 15px;
}

.math-background ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.math-background li {
    margin-bottom: 8px;
}

.formula {
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    text-align: center;
    margin: 15px 0;
    font-size: 1rem;
    border-left: 3px solid var(--accent-purple);
}

footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--accent-cyan);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1200px) {
    main {
        grid-template-columns: 1fr;
    }

    .canvas-overlay {
        position: static;
        max-width: 100%;
        margin-top: 15px;
    }
}

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

    .operation-grid,
    .preset-grid {
        grid-template-columns: 1fr;
    }

    .vector-input-group {
        flex-wrap: wrap;
    }

    .vector-input-group label {
        min-width: 100%;
    }
}