src/css/style.css

/* ============================================================
   School of Statistics - Design System
   Professional, Clean, Unified Styles
   ============================================================ */

/* CSS Variables for consistent theming */
:root {
    /* Colors */
    --color-bg: #f5f5f5;
    --color-surface: #ffffff;
    --color-surface-alt: #fafafa;
    --color-border: #e0e0e0;
    --color-text-primary: #212121;
    --color-text-secondary: #616161;
    --color-text-muted: #9e9e9e;
    --color-accent: #1976d2;
    --color-accent-light: #e3f2fd;
    --color-success: #2e7d32;
    --color-warning: #ed6c02;
    --color-error: #d32f2f;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    
    /* Border radius */
    --radius-sm: 2px;
    --radius-md: 4px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* Layout Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-lg);
}

/* Header */
h1 {
    text-align: center;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xl);
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    font-size: 0.95rem;
}

/* Floating Controls Panel */
.floating-controls {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    width: 300px;
    max-height: calc(100vh - var(--space-lg) * 2);
    overflow-y: auto;
}

.controls-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-sm);
    cursor: grab;
}

.controls-title:active {
    cursor: grabbing;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.matrix-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

/* Control Groups */
.control-group {
    text-align: left;
}

.control-label {
    font-weight: 500;
    margin-bottom: var(--space-xs);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

/* Lock Toggle */
.lock-toggle {
    cursor: pointer;
    margin-left: var(--space-sm);
    font-size: 0.875rem;
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.lock-toggle:hover {
    opacity: 1;
}

.lock-toggle.locked {
    opacity: 1;
    color: var(--color-error);
}

/* Sliders */
.slider {
    width: 100%;
    height: 4px;
    border-radius: var(--radius-sm);
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin: var(--space-sm) 0;
}

.slider:disabled {
    opacity: 0.4;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    border: 2px solid var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.slider:disabled::-webkit-slider-thumb {
    background: var(--color-text-muted);
    cursor: not-allowed;
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    border: 2px solid var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.slider-value {
    font-weight: 500;
    color: var(--color-text-primary);
    font-size: 0.8125rem;
    text-align: right;
    font-family: 'SF Mono', Monaco, monospace;
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.checkbox-label:hover {
    background-color: var(--color-surface-alt);
}

.checkbox-label input[type="checkbox"] {
    margin-right: var(--space-sm);
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

/* Charts Container */
.charts-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-right: 340px; /* Space for floating controls */
}

/* Chart Cards */
.chart-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}

.chart-card:hover {
    box-shadow: var(--shadow-md);
}

.chart-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    text-align: center;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.chart-container {
    position: relative;
    height: 280px;
}

/* Confusion Matrix Layout */
.confusion-matrix-layout {
    position: relative;
    width: 250px;
    height: 250px;
    margin: 0 auto;
    top: 50%;
    transform: translateY(-50%);
}

.matrix-ylabel,
.matrix-xlabel {
    position: absolute;
    font-weight: 500;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.matrix-ylabel {
    top: 50%;
    left: -24px;
    transform: translateY(-50%) rotate(-90deg);
}

.matrix-xlabel {
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
}

.matrix-canvas-container {
    width: 100%;
    height: 100%;
}

#matrixChart {
    max-width: 100%;
    max-height: 100%;
}

/* Metrics Display (for embedding_distances) */
.metrics-display {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.metrics-title {
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-border);
    cursor: help;
}

.metric-item:last-child {
    border-bottom: none;
}

.metric-label {
    font-weight: 400;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
}

.metric-value {
    font-family: 'SF Mono', Monaco, monospace;
    font-weight: 500;
    color: var(--color-text-primary);
    padding-left: var(--space-sm);
    font-size: 0.8125rem;
    text-align: right;
    min-width: 60px;
}

.metrics-legend {
    margin-top: var(--space-md);
    padding: var(--space-sm);
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    text-align: center;
}

.metrics-legend small {
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
}

.metrics-legend span {
    margin: 0 var(--space-xs);
    white-space: nowrap;
}

/* Chart Hint */
.chart-hint {
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--space-xl);
    margin-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    margin-right: 340px;
}

footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

footer a:hover {
    color: var(--color-accent);
}

/* Buttons */
.button-start {
    background-color: var(--color-success);
    border: none;
    color: white;
    padding: var(--space-md) var(--space-lg);
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 500;
    margin: var(--space-xs) 0;
    cursor: pointer;
    border-radius: var(--radius-sm);
    width: 100%;
    box-sizing: border-box;
    transition: background-color var(--transition-fast);
}

.button-start:hover {
    background-color: #1b5e20;
}

/* Scrollbar Styling */
.floating-controls::-webkit-scrollbar {
    width: 6px;
}

.floating-controls::-webkit-scrollbar-track {
    background: transparent;
}

.floating-controls::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-sm);
}

.floating-controls::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .charts-container {
        grid-template-columns: 1fr;
        margin-right: 0;
    }
    
    footer {
        margin-right: 0;
    }
    
    .floating-controls {
        position: static;
        width: 100%;
        max-width: 600px;
        margin: 0 auto var(--space-lg);
        max-height: none;
    }
}

@media (max-width: 600px) {
    .container {
        padding: var(--space-md);
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .chart-card {
        padding: var(--space-md);
    }
    
    .chart-container {
        height: 250px;
    }
    
    .matrix-grid {
        grid-template-columns: 1fr;
    }
    
    .metric-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
    
    .metric-value {
        padding-left: 0;
        text-align: left;
    }
}