/* ===================================
   CALORIE CALCULATOR STYLES
   CalcTechLab Design System
   =================================== */

:root {
    --primary: #FF6B35;
    --primary-dark: #E85A2A;
    --primary-light: #FF8C5F;
    --secondary: #F7931E;
    --accent: #FDC830;
    
    --text-primary: #2C3E50;
    --text-secondary: #5A6C7D;
    --text-light: #8B9AA8;
    --background: #FFFFFF;
    --background-alt: #F8F9FA;
    --border: #E1E8ED;
    
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --info: #3B82F6;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    
    --transition: 250ms ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background: linear-gradient(135deg, #F0F7FF 0%, #E6F2FF 100%);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-lg);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Header */
.calculator-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: var(--spacing-xl);
    text-align: center;
}

.calculator-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}



/* Enhanced Medical-Grade Header */
.calculator-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.header-icon {
    flex-shrink: 0;
}

.header-icon svg {
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.header-text {
    flex: 1;
    text-align: left;
}

.header-text h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.5px;
}

.header-text .subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.header-description {
    font-size: 0.95rem;
    opacity: 0.85;
    line-height: 1.5;
    max-width: 600px;
}

/* BMR Method Section */
.bmr-method-section {
    background: linear-gradient(135deg, #F0F7FF 0%, #E6F2FF 100%);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.bmr-method-section label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--primary-dark);
}

.label-with-info {
    flex: 1;
}

.info-icon {
    cursor: help;
    font-size: 1.1rem;
    opacity: 0.7;
    transition: var(--transition);
}

.info-icon:hover {
    opacity: 1;
    transform: scale(1.1);
}

.method-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: white;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
}

.body-fat-group {
    background: #FFF9E6;
    border: 2px solid var(--accent);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.body-fat-group label {
    color: var(--text-primary);
    font-weight: 600;
}

.field-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.field-note a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.field-note a:hover {
    text-decoration: underline;
}

/* Enhanced Form Styling */
.form-group select,
.form-group input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.form-group select:focus,
.form-group input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Enhanced Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
    margin-top: var(--spacing-lg);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.4);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .header-text {
        text-align: center;
    }
    
    .header-text h1 {
        font-size: 1.75rem;
    }
    
    .header-description {
        font-size: 0.9rem;
    }
}


/* Tabs */
.calculator-tabs {
    display: flex;
    background: var(--background-alt);
    border-bottom: 2px solid var(--border);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    min-width: 150px;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.tab-btn:hover {
    background: rgba(255, 107, 53, 0.05);
    color: var(--primary);
}

.tab-btn.active {
    background: white;
    border-bottom-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

/* Tab Content */
.tab-content {
    padding: var(--spacing-xl);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn var(--transition);
}

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

.tab-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.input-section, .results-section {
    background: var(--background-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
}

.input-section h2, .results-section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* Forms */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: all var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.unit {
    display: inline-block;
    margin-left: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Buttons */
.calculate-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Result Cards */
.result-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
}

.primary-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    text-align: center;
}

.primary-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.big-number {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    margin: var(--spacing-md) 0;
}

.result-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

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

.result-card h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin: var(--spacing-sm) 0;
}

.small-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Macros Section */
.macros-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.macros-section h3 {
    margin-bottom: var(--spacing-md);
}

.macro-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.macro-tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background-alt);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
}

.macro-tab:hover {
    border-color: var(--primary-light);
}

.macro-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

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

.macro-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--background-alt);
    border-radius: var(--radius-sm);
}

.macro-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.macro-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.macro-calories {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Zigzag Section */
.zigzag-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.zigzag-section h3 {
    margin-bottom: var(--spacing-sm);
}

.info-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

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

.zigzag-table th,
.zigzag-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.zigzag-table th {
    background: var(--background-alt);
    font-weight: 600;
    color: var(--text-primary);
}

.zigzag-table td {
    color: var(--text-secondary);
}

.zigzag-table tr:hover {
    background: var(--background-alt);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.action-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

.action-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Converter */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.converter-input, .converter-output {
    background: var(--background-alt);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.input-row {
    display: flex;
    gap: var(--spacing-md);
}

.input-row input {
    flex: 1;
}

.input-row select {
    flex: 1;
}

.conversion-table {
    margin-top: var(--spacing-xl);
}

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

.conversion-table th,
.conversion-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.conversion-table th {
    background: var(--background-alt);
    font-weight: 600;
}

/* Exercise Result */
.exercise-result {
    margin-top: var(--spacing-xl);
}

/* Database */
.database-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.database-controls select {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
}

.food-table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

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

.data-table th {
    background: var(--background-alt);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.data-table tr:hover {
    background: var(--background-alt);
}

/* Meal Plans */
.meal-plan-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.meal-plan-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.meal-plan-card h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.plan-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.plan-breakdown {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.meal-item {
    padding: var(--spacing-md);
    background: var(--background-alt);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary);
}

.meal-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.meal-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

/* Content Section */
.content-section {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: white;
}

.content-article {
    max-width: 900px;
    margin: 0 auto;
}

.content-article h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin: var(--spacing-2xl) 0 var(--spacing-lg);
}

.content-article h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: var(--spacing-xl) 0 var(--spacing-md);
}

.content-article p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

/* FAQ */
.faq-section {
    margin-top: var(--spacing-2xl);
}

.faq-item {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--background-alt);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
}

.faq-item h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Responsive */
@media (max-width: 1024px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
    
    .macro-display {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }
    
    .container {
        border-radius: 0;
    }
    
    .calculator-header h1 {
        font-size: 1.8rem;
    }
    
    .calculator-tabs {
        overflow-x: auto;
    }
    
    .tab-btn {
        min-width: 120px;
        font-size: 0.85rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .converter-grid {
        grid-template-columns: 1fr;
    }
    
    .big-number {
        font-size: 3rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .meal-plan-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .calculator-header {
        padding: var(--spacing-lg);
    }
    
    .tab-content {
        padding: var(--spacing-md);
    }
    
    .input-section, .results-section {
        padding: var(--spacing-md);
    }
    
    .big-number {
        font-size: 2.5rem;
    }
}

/* Print */
@media print {
    body {
        background: white;
        padding: 0;
    }
    
    .container {
        box-shadow: none;
    }
    
    .calculator-tabs,
    .tab-content > .tab-panel:not(.active),
    .action-buttons,
    .content-section {
        display: none;
    }
    
    .results-section {
        display: block !important;
    }
}
/* ===================================
   EDUCATIONAL CONTENT STYLES
   =================================== */

.educational-content {
    background: var(--background);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.educational-content h2 {
    font-size: 2rem;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.intro-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

/* Method Cards */
.method-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.method-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.method-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.method-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.method-header h3 {
    font-size: 1.4rem;
    color: var(--primary-dark);
    margin: 0;
}

.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.recommended {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    color: white;
}

.badge.classic {
    background: linear-gradient(135deg, #3B82F6 0%, #2563EB 100%);
    color: white;
}

.badge.advanced {
    background: linear-gradient(135deg, #8B5CF6 0%, #7C3AED 100%);
    color: white;
}

.method-intro {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

/* Formula Box */
.formula-box {
    background: linear-gradient(135deg, #F0F7FF 0%, #E6F2FF 100%);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.formula-box h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.formula {
    background: white;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin: var(--spacing-sm) 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.formula strong {
    color: var(--primary-dark);
}

/* Method Details */
.method-details {
    margin-top: var(--spacing-md);
}

.method-details h4 {
    color: var(--primary-dark);
    margin: var(--spacing-md) 0 var(--spacing-sm);
    font-size: 1rem;
}

.method-details ul {
    list-style: none;
    padding: 0;
}

.method-details ul li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

.method-details p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: var(--spacing-sm) 0;
}

/* Comparison Section */
.comparison-section {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.comparison-section h3 {
    color: var(--primary-dark);
    font-size: 1.6rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.comparison-table {
    overflow-x: auto;
}

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

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.comparison-table th {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    font-weight: 600;
}

.comparison-table tr:hover {
    background: var(--background-alt);
}

.comparison-table td:first-child {
    font-weight: 500;
    color: var(--text-primary);
}

/* TDEE Section */
.tdee-section {
    background: linear-gradient(135deg, #F0F7FF 0%, #E6F2FF 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.tdee-section h3 {
    color: var(--primary-dark);
    font-size: 1.6rem;
    margin-bottom: var(--spacing-md);
}

.tdee-section > p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

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

.activity-card {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.activity-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.activity-card h4 {
    color: var(--primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.activity-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* References Section */
.references-section {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.references-section h3 {
    color: var(--primary-dark);
    font-size: 1.6rem;
    margin-bottom: var(--spacing-lg);
}

.references-list {
    list-style: decimal;
    padding-left: var(--spacing-lg);
}

.references-list li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.references-list em {
    font-style: italic;
    color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .method-cards {
        grid-template-columns: 1fr;
    }
    
    .activity-factors {
        grid-template-columns: 1fr;
    }
    
    .comparison-table {
        font-size: 0.85rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
    }
}