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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

header .subtitle {
    font-size: 1.1em;
    opacity: 0.95;
    font-weight: 300;
}

/* Tabs Navigation */
.tabs-nav {
    display: flex;
    background: #f8f9fa;
    border-bottom: 2px solid #e0e0e0;
    padding: 0;
    margin: 0;
}

.tab-button {
    flex: 1;
    padding: 16px 20px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    color: #666;
    transition: all 0.3s;
    position: relative;
    text-align: center;
}

.tab-button:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.tab-button.active {
    color: #667eea;
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: #667eea;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

main {
    padding: 40px;
    display: grid;
    gap: 30px;
}

/* Two-column layout for controls and visualization */
.controls-and-viz {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.controls-and-viz .controls-section {
    grid-column: 1;
    margin-bottom: 0;
}

.controls-and-viz .visualization-section {
    grid-column: 2;
    margin-bottom: 0;
}

section {
    margin-bottom: 40px;
}

section h2 {
    color: #667eea;
    font-size: 1.8em;
    margin-bottom: 20px;
    font-weight: 600;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

/* Controls Section */
.controls-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    border-left: 5px solid #667eea;
}

.control-group {
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
}

.control-group label {
    font-weight: 600;
    margin-bottom: 10px;
    color: #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.value-display {
    background: #667eea;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 700;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: linear-gradient(to right, #667eea, #764ba2);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    border: 3px solid #667eea;
    transition: all 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    border: 3px solid #667eea;
    transition: all 0.2s;
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

#biasSlider {
    background: linear-gradient(to right, #ef4444, #f59e0b);
}

.regenerate-btn {
    width: 100%;
    padding: 14px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.regenerate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.regenerate-btn:active {
    transform: translateY(0);
}

/* Visualization Section */
.visualization-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
}

.viz-description {
    color: #666;
    font-size: 0.95em;
    margin-bottom: 15px;
}

.canvas-container {
    background: white;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    overflow: hidden;
}

canvas {
    display: block;
    max-width: 100%;
}

/* Stats Section */
.stats-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.stat-box {
    padding: 20px;
    border-radius: 10px;
    border-left: 5px solid;
    background: white;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
}

.stat-box:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.12);
}

.stat-box h3 {
    font-size: 0.95em;
    margin-bottom: 10px;
    color: #333;
    font-weight: 600;
}

.stat-value {
    font-size: 2.2em;
    font-weight: 700;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.85em;
    color: #666;
    font-weight: 500;
}

.true-positive {
    border-left-color: #10b981;
    background: linear-gradient(135deg, #f0fdf4 0%, #dbeafe 100%);
}

.true-positive .stat-value {
    color: #10b981;
}

.false-positive {
    border-left-color: #f59e0b;
    background: linear-gradient(135deg, #fffbf0 0%, #fef3c7 100%);
}

.false-positive .stat-value {
    color: #f59e0b;
}

.true-negative {
    border-left-color: #3b82f6;
    background: linear-gradient(135deg, #f0f9ff 0%, #dbeafe 100%);
}

.true-negative .stat-value {
    color: #3b82f6;
}

.false-negative {
    border-left-color: #ef4444;
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
}

.false-negative .stat-value {
    color: #ef4444;
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.metric-box {
    background: white;
    padding: 18px;
    border-radius: 10px;
    border: 2px solid #e0e0e0;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
}

.metric-box:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.metric-box h3 {
    font-size: 0.9em;
    color: #333;
    margin-bottom: 8px;
    font-weight: 600;
}

.metric-value {
    font-size: 1.8em;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 8px;
}

.metric-desc {
    font-size: 0.8em;
    color: #999;
    font-family: 'Courier New', monospace;
}

/* Confusion Matrix */
.confusion-matrix {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.confusion-matrix h3 {
    color: #333;
    margin-bottom: 15px;
    font-weight: 600;
}

.confusion-matrix table {
    width: 100%;
    border-collapse: collapse;
}

.confusion-matrix th,
.confusion-matrix td {
    padding: 12px;
    text-align: center;
    border: 2px solid #e0e0e0;
    font-weight: 500;
}

.confusion-matrix th {
    background: #f0f0f0;
    color: #333;
    font-weight: 600;
}

.confusion-matrix td {
    font-size: 1.1em;
    font-weight: 700;
}

/* Insight Section */
.insight-section {
    background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
    padding: 25px;
    border-radius: 12px;
    border-left: 5px solid #f59e0b;
}

.insight-section h2 {
    color: #d97706;
    border-bottom-color: #d97706;
}

.insight-section p {
    color: #92400e;
    font-size: 1.05em;
    line-height: 1.8;
    font-weight: 500;
}

/* Footer */
footer {
    background: #f0f0f0;
    padding: 20px;
    text-align: center;
    color: #666;
    font-size: 0.9em;
    border-top: 1px solid #e0e0e0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .controls-and-viz {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    main {
        padding: 20px;
    }

    header h1 {
        font-size: 1.8em;
    }

    section h2 {
        font-size: 1.4em;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

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

    .confusion-matrix table {
        font-size: 0.9em;
    }

    .confusion-matrix th,
    .confusion-matrix td {
        padding: 8px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    main {
        padding: 15px;
    }

    header {
        padding: 25px 15px;
    }

    header h1 {
        font-size: 1.5em;
    }

    section h2 {
        font-size: 1.2em;
    }

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

    .canvas-container {
        min-height: 300px;
    }
}