:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #14192b;
    --bg-tertiary: #1c2336;
    --text-primary: #e8eaf0;
    --text-secondary: #a0a8b8;
    --accent-blue: #4a9eff;
    --accent-purple: #9b59b6;
    --accent-green: #2ecc71;
    --accent-red: #e74c3c;
    --accent-yellow: #f39c12;
    --border-color: #2c3e50;
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
}

* {
    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);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

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

/* Main Content */
main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (max-width: 1024px) {
    main {
        grid-template-columns: 1fr;
    }
}

/* Canvas Section */
.canvas-section {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

#canvas-container {
    width: 100%;
    height: 400px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-primary);
    margin-bottom: 20px;
}

.canvas-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.info-box {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.info-box h3 {
    margin-bottom: 10px;
    color: var(--accent-blue);
    font-size: 1.1em;
}

/* Quaternion Display */
.quaternion-display {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 5px;
    font-family: 'Courier New', monospace;
    font-size: 1.1em;
    margin-bottom: 10px;
}

.quaternion-label {
    color: var(--text-secondary);
    margin-right: 5px;
}

.component {
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.component.w { background: rgba(74, 158, 255, 0.2); color: var(--accent-blue); }
.component.x { background: rgba(231, 76, 60, 0.2); color: var(--accent-red); }
.component.y { background: rgba(46, 204, 113, 0.2); color: var(--accent-green); }
.component.z { background: rgba(155, 89, 182, 0.2); color: var(--accent-purple); }

.imaginary {
    color: var(--accent-yellow);
    font-style: italic;
}

.magnitude {
    font-family: 'Courier New', monospace;
    color: var(--text-secondary);
    font-size: 0.9em;
}

/* Matrix Display */
.matrix-display {
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
}

.matrix-row {
    display: flex;
    gap: 5px;
    margin-bottom: 5px;
}

.matrix-cell {
    background: var(--bg-primary);
    padding: 8px 12px;
    border-radius: 4px;
    min-width: 80px;
    text-align: center;
    border: 1px solid var(--border-color);
}

/* Controls Section */
.controls-section {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
}

.control-panel {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.control-panel h2 {
    margin-bottom: 15px;
    color: var(--accent-blue);
    font-size: 1.3em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-group select,
.control-group input[type="number"] {
    width: 100%;
    padding: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1em;
}

.control-group select:focus,
.control-group input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-blue);
}

/* Axis Buttons */
.axis-buttons {
    display: flex;
    gap: 10px;
}

.axis-btn {
    flex: 1;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
}

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

.axis-btn.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

/* Custom Axis Inputs */
.axis-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 10px;
    align-items: center;
}

.axis-label {
    color: var(--accent-red);
    font-weight: bold;
    margin-right: 5px;
}

/* Slider Controls */
input[type="range"] {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-blue);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-purple);
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-blue);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    background: var(--accent-purple);
    transform: scale(1.2);
}

/* Angle Presets */
.angle-presets {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

.angle-preset {
    flex: 1;
    padding: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

/* Euler Inputs */
.euler-inputs > div {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.euler-inputs input[type="range"] {
    flex: 1;
}

.angle-value {
    min-width: 40px;
    text-align: right;
    color: var(--text-secondary);
}

/* Buttons */
.primary-btn,
.secondary-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.4);
}

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

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

.animation-controls {
    display: flex;
    gap: 10px;
}

.animation-controls button {
    flex: 1;
    margin-bottom: 0;
}

/* Quaternion Operations */
.quaternion-inputs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.q-input {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--bg-tertiary);
    padding: 8px;
    border-radius: 6px;
}

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

.q-input input {
    width: 60px;
    padding: 5px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    text-align: center;
}

.operator {
    color: var(--accent-yellow);
    font-weight: bold;
    font-size: 1.2em;
}

.q-result {
    background: var(--bg-primary);
    padding: 8px;
    border-radius: 6px;
    border: 2px solid var(--accent-green);
}

.q-val {
    display: inline-block;
    width: 50px;
    text-align: center;
    color: var(--accent-green);
    font-weight: bold;
}

.single-ops {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}

.single-ops button {
    margin-bottom: 0;
}

.op-result {
    background: var(--bg-tertiary);
    padding: 10px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--accent-green);
}

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

.preset-btn {
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.preset-btn:hover {
    background: var(--bg-primary);
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

/* Comparison Panel */
.comparison-info p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

.warning {
    background: rgba(243, 156, 18, 0.1);
    border-left: 4px solid var(--warning);
    padding: 12px;
    border-radius: 4px;
    color: var(--warning);
}

.comparison-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

.stat {
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: 6px;
    text-align: center;
}

.stat label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.status {
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 0.9em;
}

.status.normal {
    background: rgba(39, 174, 96, 0.2);
    color: var(--success);
}

.status.gimbal-lock {
    background: rgba(231, 76, 60, 0.2);
    color: var(--danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* SLERP Controls */
.slerp-controls {
    margin-bottom: 15px;
}

.slerp-info p {
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.slerp-quaternions {
    background: var(--bg-tertiary);
    padding: 10px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
}

.slerp-quaternions div {
    margin-bottom: 5px;
    color: var(--text-secondary);
}

/* Path Controls */
.path-options {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.path-options button {
    flex: 1;
    margin-bottom: 0;
}

.path-settings {
    margin-bottom: 10px;
}

.path-settings label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.path-settings input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.path-info {
    background: var(--bg-tertiary);
    padding: 10px;
    border-radius: 6px;
    font-size: 0.9em;
    color: var(--text-secondary);
}

/* Theory Section */
.theory-section {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.theory-section h2 {
    margin-bottom: 20px;
    color: var(--accent-blue);
    font-size: 1.5em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.theory-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.theory-block {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.theory-block h3 {
    margin-bottom: 10px;
    color: var(--accent-purple);
    font-size: 1.1em;
}

.theory-block p {
    margin-bottom: 10px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.theory-block ul {
    list-style: none;
    padding-left: 0;
}

.theory-block ul li {
    padding: 5px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 20px;
}

.theory-block ul li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-blue);
}

.formula {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 1em;
    color: var(--accent-green);
    text-align: center;
    margin: 10px 0;
    border: 1px solid var(--border-color);
}

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

footer p {
    margin-bottom: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 0.9em;
    }

    .control-panel {
        padding: 15px;
    }

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

    .theory-content {
        grid-template-columns: 1fr;
    }

    .axis-inputs {
        grid-template-columns: 1fr 1fr;
    }

    .single-ops {
        grid-template-columns: 1fr;
    }

    .comparison-stats {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}