/* Educational Inequality Data Explorer - Modern UI */
/* Author: Kevin Schoenholzer */
/* Redesigned: 2025 */

/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== Design Tokens ===== */
:root {
    /* Primary palette - sophisticated blue-violet */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;

    /* Accent - warm coral/orange for highlights */
    --accent-400: #fb923c;
    --accent-500: #f97316;
    --accent-600: #ea580c;

    /* Success/positive */
    --success-400: #4ade80;
    --success-500: #22c55e;

    /* Semantic colors */
    --primary-color: var(--primary-500);
    --accent-color: var(--accent-500);
    --success-color: var(--success-500);

    /* Dark theme surfaces */
    --background: #09090b;
    --surface-1: #18181b;
    --surface-2: #27272a;
    --surface-3: #3f3f46;

    /* Text */
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    /* Borders */
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Glass effect */
    --glass-bg: rgba(24, 24, 27, 0.8);
    --glass-border: rgba(255, 255, 255, 0.06);

    /* Plotly */
    --plotly-bg: var(--surface-1);
    --code-bg: var(--surface-2);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Typography ===== */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Subtle animated gradient background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(249, 115, 22, 0.08), transparent);
    pointer-events: none;
    z-index: -1;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

/* ===== Layout ===== */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ===== Header ===== */
.header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

.header-content img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.header-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: var(--space-1);
    max-width: 600px;
}

/* ===== Main Content Area ===== */
.content-area {
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin: var(--space-6) 0;
    min-height: 600px;
    box-shadow: var(--shadow-xl);
}

/* ===== Tabs Navigation ===== */
.tabs {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-2);
    background: var(--surface-2);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    padding: var(--space-3) var(--space-5);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
}

.tab:hover {
    color: var(--text-primary);
    background: var(--surface-3);
}

.tab.active {
    color: var(--text-primary);
    background: var(--primary-600);
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.3);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Cards ===== */
.stat-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-400), var(--accent-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    width: 100%;
}

.btn-primary, .btn {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.2);
}

.btn-primary:hover, .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary {
    background: var(--surface-3);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--surface-2);
    border-color: var(--border-hover);
}

/* ===== Form Controls ===== */
.control-group {
    margin-bottom: var(--space-6);
}

label {
    display: block;
    font-weight: 500;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

select, input[type="text"], input[type="number"] {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    appearance: none;
}

select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: var(--space-10);
}

select:hover, input:hover {
    border-color: var(--border-hover);
}

select:focus, input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Checkbox styling */
input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-500);
    cursor: pointer;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 0.9375rem;
    cursor: pointer;
    padding: var(--space-2) 0;
    color: var(--text-primary);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* ===== Country Selector ===== */
#country-checkboxes {
    display: grid !important;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)) !important;
    gap: var(--space-2) var(--space-4) !important;
    max-height: 280px !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    padding: var(--space-4);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    scrollbar-width: thin;
    scrollbar-color: var(--surface-3) transparent;
}

#country-checkboxes::-webkit-scrollbar {
    width: 6px;
}

#country-checkboxes::-webkit-scrollbar-track {
    background: transparent;
}

#country-checkboxes::-webkit-scrollbar-thumb {
    background: var(--surface-3);
    border-radius: var(--radius-full);
}

#country-checkboxes label {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--surface-1);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

#country-checkboxes label:hover {
    background: var(--surface-3);
}

#country-checkboxes input[type="checkbox"] {
    width: 16px;
    height: 16px;
}

/* Year checkboxes - similar to country checkboxes */
#year-checkboxes {
    display: grid !important;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)) !important;
    gap: var(--space-2) var(--space-3) !important;
    padding: var(--space-4);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

#year-checkboxes label {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--surface-1);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

#year-checkboxes label:hover {
    background: var(--surface-3);
}

#year-checkboxes input[type="checkbox"] {
    width: 16px;
    height: 16px;
}

/* ===== Alerts ===== */
.alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    border-left: 4px solid;
}

.alert-info {
    background: rgba(99, 102, 241, 0.1);
    border-left-color: var(--primary-500);
    color: var(--primary-200);
}

/* ===== Progress Bar ===== */
.progress-container {
    width: 100%;
    background: var(--surface-2);
    border-radius: var(--radius-full);
    height: 8px;
    margin: var(--space-4) 0;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-500));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===== Loading States ===== */
.loading {
    display: none;
    text-align: center;
    padding: var(--space-8);
}

.loading.active {
    display: block;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--surface-3);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

.spinner-inline {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

body.calculating, body.calculating * {
    cursor: wait !important;
}

/* ===== Grid Layouts ===== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.doc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-6);
}

.export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-6);
}

/* ===== Documentation Cards ===== */
.doc-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    transition: all var(--transition-base);
}

.doc-card:hover {
    border-color: var(--primary-500);
    box-shadow: var(--shadow-glow);
}

.doc-card h3 {
    font-size: 1.125rem;
    color: var(--primary-400);
}

.doc-card-body {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    flex: 1;
}

.doc-card-wide {
    grid-column: span 2;
}

.doc-callout {
    background: var(--surface-1);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* ===== Regression & Model Output ===== */
.regression-output {
    background: var(--surface-1);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    margin-top: var(--space-4);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.8125rem;
    border: 1px solid var(--border);
}

.model-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-4);
}

.model-box {
    background: var(--surface-2);
    padding: var(--space-5);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.model-header {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--primary-500);
    color: var(--text-primary);
}

.coef-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.coef-table th {
    background: var(--surface-1);
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.coef-table td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--border);
}

.coef-table tr:hover {
    background: var(--surface-1);
}

.significant {
    color: var(--accent-400);
    font-weight: 600;
}

/* ===== Plotly Chart Containers ===== */
#overview-chart,
#distribution-chart,
#percentile-chart,
#lorenz-curve,
#gap-plot,
#country-comparison,
#decomposition-chart,
#regression-plot,
#world-map,
#temporal-trends,
#gap-comparison-chart {
    width: 100% !important;
    max-width: 100% !important;
    height: 450px;
    background: var(--surface-2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
}

/* ===== Methodology Notes ===== */
.methodology-note {
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-left: 4px solid var(--primary-500);
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    margin: var(--space-4) 0;
    font-size: 0.875rem;
    color: var(--primary-200);
}

/* ===== Info & Help Text ===== */
.weight-info {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-2);
}

.data-source {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border);
}

.description {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

/* ===== Home Page Hero ===== */
#home .stat-card {
    text-align: center;
    position: relative;
    overflow: hidden;
}

#home .stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-500));
    opacity: 0;
    transition: opacity var(--transition-base);
}

#home .stat-card:hover::before {
    opacity: 1;
}

#home .stat-card h3 {
    color: var(--primary-400);
    margin-bottom: var(--space-3);
}

/* Feature icons on home */
#home .stat-card > div:first-child {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    filter: grayscale(0.2);
}

/* ===== Advanced Options Panel ===== */
.advanced-options {
    background: var(--surface-1);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-top: var(--space-4);
    border: 1px solid var(--border);
}

.options-header {
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.options-header:hover {
    color: var(--text-primary);
}

.options-header::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 5px solid currentColor;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    margin-right: var(--space-3);
    transition: transform var(--transition-fast);
}

.options-header.expanded::before {
    transform: rotate(90deg);
}

.options-content {
    display: none;
    padding-top: var(--space-4);
}

.options-content.expanded {
    display: block;
}

/* ===== Optional Visualization Controls ===== */
.optional-viz-controls {
    margin-top: var(--space-6);
    padding: var(--space-5);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.optional-viz-controls h3 {
    font-size: 1rem;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.viz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.viz-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
    position: relative;
}

.viz-checkbox:hover {
    background: var(--surface-3);
}

.viz-checkbox input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.viz-checkbox .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-muted);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.viz-checkbox:hover .checkmark {
    border-color: var(--primary-400);
}

.viz-checkbox input:checked ~ .checkmark {
    background: var(--primary-500);
    border-color: var(--primary-500);
}

.viz-checkbox input:checked ~ .checkmark::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.viz-checkbox .label-text {
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-weight: 500;
}

.viz-info {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--surface-1);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-500);
}

/* ===== Year Selector (if visible) ===== */
.year-selector {
    max-height: 140px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    background: var(--surface-2);
}

.year-option {
    display: flex;
    align-items: center;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.year-option:hover {
    background: var(--surface-3);
}

.year-option input {
    width: auto;
    margin-right: var(--space-3);
}

/* ===== Links ===== */
a {
    color: var(--primary-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-300);
    text-decoration: underline;
}

/* ===== Responsive Design ===== */
@media (max-width: 1100px) {
    .model-comparison {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .doc-card-wide {
        grid-column: auto;
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --space-6: 1.25rem;
        --space-8: 1.5rem;
    }

    .container {
        padding: 0 var(--space-4);
    }

    .content-area {
        padding: var(--space-5);
        border-radius: var(--radius-lg);
    }

    .tabs {
        padding: var(--space-1);
    }

    .tab {
        padding: var(--space-2) var(--space-3);
        font-size: 0.8125rem;
    }

    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }

    .header-text h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        display: none;
    }
}

/* ===== Print Styles ===== */
@media print {
    body::before {
        display: none;
    }

    .header {
        position: static;
    }

    .tabs {
        display: none;
    }

    .content-area {
        box-shadow: none;
        border: none;
    }
}

/* ===== Scrollbar Styling ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-1);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-3);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Selection ===== */
::selection {
    background: rgba(99, 102, 241, 0.3);
    color: var(--text-primary);
}

/* ===== Focus Visible ===== */
:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* ===== High Contrast UI Elements ===== */
.ui-contrast,
.ui-contrast select,
select.ui-contrast {
    background-color: var(--surface-1);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
}

.panel-dark {
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
}

.form-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    letter-spacing: 0.02em;
}

/* ===== Utility: Prevent Overflow ===== */
html, body {
    overflow-x: hidden !important;
}

.container, main, .content-area {
    overflow-x: hidden !important;
}

#country-checkboxes, #country-checkboxes * {
    min-width: 0;
}

/* Allow tables to scroll */
.stat-card > div[style*="overflow-x: auto"] {
    overflow-x: auto !important;
    max-width: 100%;
}

#regression-results,
#regression-results > div {
    max-width: 100%;
}

#regression-results > div[style*="overflow"] {
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
}

/* Plotly containers */
#distribution,
#distribution-chart,
#percentile-chart,
#lorenz-curve {
    max-width: 100% !important;
    overflow: hidden !important;
}

.js-plotly-plot {
    max-width: 100% !important;
}