/**
 * Global styles for Investment Crossover Calculator
 */

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

:root {
    /* Elegant Black/White/Silver Color Scheme */
    --color-primary: #1a1a1a;
    --color-primary-dark: #000000;
    --color-secondary: #6b7280;
    --color-secondary-dark: #4b5563;
    --color-accent: #9ca3af;
    --color-background: #fafafa;
    --color-surface: #ffffff;
    --color-text: #111111;
    --color-text-muted: #6b7280;
    --color-border: #d1d5db;

    /* Chart colors - elegant grayscale with subtle tints */
    --chart-contribution: #1a1a1a;
    --chart-contribution-fill: rgba(26, 26, 26, 0.15);
    --chart-income: #6b7280;
    --chart-income-fill: rgba(107, 114, 128, 0.25);
    --chart-interest: #9ca3af;
    --chart-interest-fill: rgba(156, 163, 175, 0.4);
    --chart-projection: #d1d5db;
    --chart-projection-fill: rgba(209, 213, 219, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Font */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Header */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

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

/* 7.1 - Main Layout (inputs on left, chart on right for desktop) */
.app-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 1024px) {
    .app-layout {
        grid-template-columns: 350px 1fr;
        grid-template-rows: auto 1fr;
    }

    #input-controls {
        grid-row: 1 / 3;
    }

    #results-display {
        grid-column: 2;
        grid-row: 1;
    }

    #chart-container {
        grid-column: 2;
        grid-row: 2;
    }
}

/* Panel (card-like container) */
.panel {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
}

/* 7.2 - Input Controls Styling */
.input-controls h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

/* Currency input */
.currency-input {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: var(--spacing-md);
    color: var(--color-text-muted);
    font-weight: 500;
}

.currency-input input {
    width: 100%;
    padding: var(--spacing-md);
    padding-left: var(--spacing-xl);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.currency-input input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Slider + input group */
.slider-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slider-input-group input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-border);
    border-radius: 3px;
    cursor: pointer;
}

.slider-input-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}

.slider-input-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--color-primary-dark);
}

.slider-input-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

/* Rate input with percent symbol */
.rate-input {
    position: relative;
    display: flex;
    align-items: center;
    min-width: 90px;
}

.rate-input input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: var(--spacing-xl);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    text-align: right;
}

.rate-input input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.percent-symbol {
    position: absolute;
    right: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Year input for stop contributing */
.year-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 130px;
}

.year-input input {
    width: 60px;
    padding: var(--spacing-sm) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    text-align: center;
}

.year-input input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#stop-contributing-year-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
}

/* 7.7 - Preset Buttons */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.preset-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.preset-btn:hover {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.05);
}

.preset-btn.active {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
}

.preset-btn small {
    display: block;
    color: var(--color-text-muted);
    font-weight: 400;
}

.preset-btn.active small {
    color: var(--color-primary);
}

/* Toggle/Checkbox */
.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

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

.toggle-text {
    font-weight: 500;
}

/* 7.3 - Results Display Styling */
.results-display h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.results-card {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
}

.results-card h3,
.results-card h4 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
}

.result-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.result-description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

.result-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

/* 7.4 - Highlight crossover results (celebratory styling) */
.results-highlight {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.1));
    border: 2px solid var(--color-secondary);
}

.results-highlight .result-value {
    color: var(--color-secondary-dark);
    font-size: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* 7.5 - Responsive: stack on mobile */
@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

/* Results placeholder/unreachable states */
.results-placeholder,
.results-unreachable {
    background: var(--color-background);
}

.results-unreachable {
    border: 2px dashed var(--color-border);
}

.results-unreachable h3 {
    color: var(--color-text);
}

.suggestion {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.results-note {
    margin-top: var(--spacing-md);
    text-align: center;
    color: var(--color-text-muted);
}

/* Expanded Explanation */
.expanded-explanation {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-background);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-secondary);
}

.expanded-explanation .explanation-intro {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.expanded-explanation p {
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.expanded-explanation p:last-child {
    margin-bottom: 0;
}

.expanded-explanation .explanation-highlight {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.05));
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin: var(--spacing-md) 0;
}

.expanded-explanation .explanation-context {
    font-style: italic;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Show Me The Math Section */
.math-section {
    margin-top: var(--spacing-lg);
}

.math-toggle-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: background-color 0.2s, transform 0.1s;
}

.math-toggle-btn:hover {
    background: var(--color-primary-dark);
}

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

.math-toggle-icon {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.math-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.3s ease;
    background: var(--color-background);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.math-content.expanded {
    max-height: 2000px;
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-top: none;
}

.math-intro {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.math-legend {
    background: linear-gradient(to right, #f9fafb, #f3f4f6);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.math-legend h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.legend-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-xs) var(--spacing-md);
}

.legend-item {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.legend-item em {
    font-family: 'Times New Roman', 'Georgia', serif;
    font-style: italic;
    color: var(--color-primary);
    font-weight: 500;
}

.math-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.math-step {
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.math-step-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.math-step-explanation {
    font-size: 0.9rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

/* Mathematical typesetting styles */
.math-formula {
    background: linear-gradient(to bottom, var(--color-surface), var(--color-background));
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    font-family: 'Times New Roman', 'Georgia', serif;
    overflow-x: auto;
    border: 1px solid var(--color-border);
    text-align: center;
}

.math-formula .math-expr {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.math-formula .math-var {
    font-style: italic;
    color: var(--color-primary);
}

.math-formula .math-op {
    font-style: normal;
    padding: 0 0.3em;
    color: var(--color-text-muted);
}

.math-formula .math-eq {
    font-style: normal;
    padding: 0 0.5em;
    color: var(--color-text);
    font-weight: 500;
}

.math-formula .math-fn {
    font-style: normal;
    font-variant: small-caps;
    color: var(--color-secondary-dark);
}

.math-formula sup {
    font-size: 0.7em;
    vertical-align: super;
    line-height: 0;
}

.math-formula sub {
    font-size: 0.7em;
    vertical-align: sub;
    line-height: 0;
}

.math-formula .math-frac {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    vertical-align: middle;
    margin: 0 0.2em;
}

.math-formula .math-frac-num,
.math-formula .math-frac-den {
    font-size: 0.85em;
    line-height: 1.2;
}

.math-formula .math-frac-num {
    border-bottom: 1px solid var(--color-text-muted);
    padding-bottom: 2px;
}

.math-formula .math-frac-den {
    padding-top: 2px;
}

.math-formula .math-paren {
    font-size: 1.3em;
    font-weight: 300;
    color: var(--color-text-muted);
    vertical-align: middle;
}

.math-formula .math-bracket {
    font-size: 1.2em;
    font-weight: 300;
    color: var(--color-text-muted);
}

.math-calculation {
    background: linear-gradient(135deg, rgba(156, 163, 175, 0.1), rgba(107, 114, 128, 0.05));
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-family: 'Times New Roman', 'Georgia', serif;
    overflow-x: auto;
    border-left: 3px solid var(--color-secondary);
    text-align: center;
}

.math-calculation .math-expr {
    font-size: 1.05rem;
    color: var(--color-text);
    letter-spacing: 0.01em;
}

.math-calculation .math-result {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 1.1rem;
}

.math-calculation .math-val {
    font-style: normal;
    color: var(--color-secondary-dark);
    font-weight: 500;
}

.math-calculation .math-check {
    color: var(--color-secondary-dark);
    font-size: 1.2em;
    margin-left: 0.3em;
}

.math-summary {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(156, 163, 175, 0.15), rgba(107, 114, 128, 0.1));
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.math-summary h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-secondary-dark);
    margin-bottom: var(--spacing-md);
}

.math-summary ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.math-summary li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text);
    font-size: 0.9rem;
}

.math-summary li strong {
    color: var(--color-text);
}

/* Responsive adjustments for math section */
@media (max-width: 768px) {
    .math-formula,
    .math-calculation {
        font-size: 0.8rem;
    }

    .math-step {
        padding: var(--spacing-sm);
    }

    .math-content.expanded {
        padding: var(--spacing-md);
    }
}

/* Chart Container */
#chart-container,
#portfolio-chart-container {
    min-height: 350px;
    position: relative;
}

#crossover-chart,
#portfolio-chart {
    width: 100%;
    height: 350px;
    max-height: 350px;
}

/* Chart section titles */
.chart-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

/* Portfolio chart container positioning in grid */
@media (min-width: 1024px) {
    #portfolio-chart-container {
        grid-column: 2;
        grid-row: 3;
    }
}

/* 7.6 - Accessibility: Focus styles */
button:focus,
input:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 7.5 - Mobile responsive adjustments */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    header h1 {
        font-size: 1.5rem;
    }

    header .subtitle {
        font-size: 0.95rem;
    }

    .panel {
        padding: var(--spacing-md);
    }

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

    .results-highlight .result-value {
        font-size: 1.5rem;
    }

    .result-value {
        font-size: 1.25rem;
    }
}

/* Remove spinner from number inputs */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* Screen reader only (accessibility) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Input hint text */
.input-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

/* Educational Content Section */
.educational-section {
    grid-column: 1 / -1;
    margin-top: var(--spacing-lg);
}

.educational-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text);
    text-align: center;
}

.edu-block {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.edu-block:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.edu-block h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.edu-block p {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.edu-block p:last-child {
    margin-bottom: 0;
}

/* Example Cards */
.example-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.example-card {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--color-primary);
}

.example-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.example-card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.1));
    border: 1px solid var(--color-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.highlight-box strong {
    color: var(--color-secondary-dark);
}

/* Pros and Cons */
.pros-cons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.pros, .cons {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.pros {
    border-left: 4px solid var(--color-secondary);
}

.cons {
    border-left: 4px solid var(--color-primary);
}

.pros h4, .cons h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.pros h4 {
    color: var(--color-secondary-dark);
}

.cons h4 {
    color: var(--color-primary-dark);
}

.pros ul, .cons ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pros li, .cons li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    font-size: 0.9rem;
    color: var(--color-text);
}

.pros li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

.cons li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

/* Considerations List */
.considerations-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.considerations-list li {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--color-background);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    line-height: 1.6;
}

.considerations-list li strong {
    color: var(--color-text);
}

/* Preset buttons grid adjustment for 6 items */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

@media (max-width: 640px) {
    .preset-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Responsive adjustments for educational content */
@media (max-width: 768px) {
    .example-cards {
        grid-template-columns: 1fr;
    }

    .pros-cons {
        grid-template-columns: 1fr;
    }

    .educational-section h2 {
        font-size: 1.25rem;
    }

    .edu-block h3 {
        font-size: 1.1rem;
    }
}

/* Table Toggle Button */
.table-toggle-btn {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.table-toggle-btn:hover {
    background: var(--color-primary);
    color: var(--color-surface);
}

.table-toggle-btn.active {
    background: var(--color-primary);
    color: var(--color-surface);
}

/* Table Container */
.table-container {
    margin-top: var(--spacing-md);
    max-height: 400px;
    overflow-y: auto;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: right;
    border-bottom: 1px solid var(--color-border);
}

.data-table th:first-child,
.data-table td:first-child {
    text-align: left;
}

.data-table thead th {
    background: var(--color-background);
    font-weight: 600;
    color: var(--color-text);
    position: sticky;
    top: 0;
    z-index: 1;
}

.data-table tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

.data-table tbody tr:hover {
    background: rgba(0, 0, 0, 0.04);
}

/* Expandable Year Rows */
.data-table .year-row {
    cursor: pointer;
    font-weight: 500;
}

.data-table .year-row:hover {
    background: rgba(0, 0, 0, 0.06);
}

.data-table .year-row td:first-child {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.expand-icon {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    transition: transform 0.2s ease;
    display: inline-block;
    width: 1em;
}

.expand-icon.expanded {
    transform: rotate(90deg);
}

/* Monthly Detail Rows */
.data-table .month-row {
    background: rgba(0, 0, 0, 0.02);
}

.data-table .month-row td {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: var(--spacing-xs) var(--spacing-md);
}

.data-table .month-row td:first-child {
    padding-left: calc(var(--spacing-md) + 1.5em);
}

.data-table .month-row:hover {
    background: rgba(0, 0, 0, 0.04);
}

/* Stopped Column Styling */
.data-table .stopped-column {
    color: var(--color-secondary);
    font-style: italic;
}

/* Stop Year Highlight */
.data-table .year-row.stop-year {
    background: rgba(107, 114, 128, 0.1);
    border-left: 3px solid var(--color-secondary);
}

.data-table .month-row.stop-month {
    background: rgba(107, 114, 128, 0.15);
}

/* Stop Contributing Description Box */
.stop-description-box {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(156, 163, 175, 0.1), rgba(107, 114, 128, 0.05));
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-secondary);
}

.stop-description-box h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.stop-description-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.stop-description-item {
    background: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    text-align: center;
}

.stop-description-item .label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stop-description-item .value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.stop-description-item .value.positive {
    color: var(--color-secondary-dark);
}

.stop-description-item .value.comparison {
    color: var(--color-primary);
}

.stop-description-explanation {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* Mobile adjustments for tables */
@media (max-width: 768px) {
    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .stop-description-grid {
        grid-template-columns: 1fr 1fr;
    }

    .stop-description-item .value {
        font-size: 1rem;
    }
}

/* Year input styling */
.year-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 140px;
}

.year-input span {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.year-input input {
    width: 70px;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    text-align: center;
}

.year-input input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Date input styling */
.date-input {
    position: relative;
}

.date-input input[type="date"] {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-surface);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.date-input input[type="date"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.date-input input[type="date"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.date-input input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

/* Result date display */
.result-date {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-top: var(--spacing-xs);
}

/* Responsive date inputs */
@media (max-width: 640px) {
    .date-input input[type="date"] {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .year-input {
        min-width: 100px;
    }

    .year-input input {
        width: 60px;
    }
}