/* Percent Error Calculator - Dark Green Eco-friendly Theme (WCAG AA Compliant) */

/* Calculator Main Section */
.calculator-section {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    padding: var(--space-16) 0;
    min-height: 600px;
}

/* Single Column Layout - Full Width */
.converter-single-column {
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.main-converter-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 25px rgba(6, 78, 59, 0.15);
    overflow: hidden;
    border: 1px solid #A7F3D0;
    padding: var(--space-8);
}

/* Main Heading */
.main-heading {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: #052e12; /* Darker green for better contrast */
    text-align: center;
    margin-bottom: var(--space-8);
    line-height: var(--line-height-tight);
    border-bottom: 3px solid #059669;
    padding-bottom: var(--space-4);
}

/* Calculator Input Container */
.calculator-input-container {
    background: #F0FDF4;
    padding: var(--space-6);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
    border: 2px solid #A7F3D0;
}

/* Input Grid Layout */
.input-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-4);
    align-items: end;
    margin-bottom: var(--space-6);
}

@media (max-width: 640px) {
    .input-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .conversion-arrow {
        display: none;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
}

.conversion-arrow {
    font-size: 1.5rem;
    color: #059669;
    font-weight: bold;
    text-align: center;
    margin-bottom: var(--space-6);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.form-label {
    display: block;
    font-weight: var(--font-weight-semibold);
    color: #052e12; /* Darker green for better contrast */
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
}

.form-input {
    width: 100%;
    padding: var(--space-4);
    padding-right: var(--space-10);
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-base);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: #052e12; /* Darker green for better contrast */
    background: var(--color-white);
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: #059669; /* Darker green for better contrast */
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.2);
}

.form-input:read-only {
    background: #F0FDF4;
    color: #052e12; /* Darker green for better contrast */
}

.input-unit {
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    font-weight: var(--font-weight-bold);
    color: #059669; /* Darker green for better contrast */
    font-size: var(--font-size-lg);
    pointer-events: none;
}

/* Rounding Options Inline */
.rounding-options-inline {
    background: #ECFDF5;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
    border: 1px solid #A7F3D0;
}

.rounding-selector {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-2);
    flex-wrap: wrap;
}

.rounding-btn {
    padding: var(--space-2) var(--space-3);
    border: 2px solid #059669;
    background: var(--color-white);
    color: #052e12;
    border-radius: var(--radius-base);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
}

.rounding-btn:hover {
    background: #F0FDF4;
    border-color: #047857;
}

.rounding-btn.active {
    background: #047857;
    color: white;
    border-color: #047857;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
    .action-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

.calc-btn {
    padding: var(--space-4) var(--space-6);
    border: none;
    border-radius: var(--radius-base);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 44px;
}

.calc-btn.primary {
    background: linear-gradient(135deg, #052e12 0%, #047857 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(4, 120, 87, 0.4);
}

.calc-btn.primary:hover {
    background: linear-gradient(135deg, #052e12 0%, #022c22 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(4, 120, 87, 0.5);
}

.calc-btn.secondary {
    background: var(--color-white);
    color: #052e12; /* Darker green for better contrast */
    border: 2px solid #059669; /* Darker green border */
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.15);
}

.calc-btn.secondary:hover {
    background: #ECFDF5;
    border-color: #047857;
    color: #052e12;
    transform: translateY(-1px);
}

/* Quick Result Display */
.quick-result {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: 2px solid #059669;
    margin-bottom: var(--space-4);
    text-align: center;
}

.result-summary {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
}

/* Detailed Results */
.detailed-results {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border: 2px solid #A7F3D0;
    margin-bottom: var(--space-6);
}

.result-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    text-align: center;
    border-bottom: 2px solid #A7F3D0;
    padding-bottom: var(--space-2);
}

/* Formula Display */
.formula-display {
    background: var(--color-white);
    padding: var(--space-4);
    border-radius: var(--radius-base);
    border: 1px solid #A7F3D0;
    margin-bottom: var(--space-4);
}

.formula-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: #052e12;
    margin-bottom: var(--space-2);
}

.formula-equation {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #047857;
    font-family: 'Courier New', monospace;
    text-align: center;
    background: #F0FDF4;
    padding: var(--space-3);
    border-radius: var(--radius-base);
}

/* Calculation Steps */
.calculation-steps {
    background: var(--color-white);
    padding: var(--space-4);
    border-radius: var(--radius-base);
    border: 1px solid #A7F3D0;
    margin-bottom: var(--space-4);
}

.steps-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: #052e12;
    margin-bottom: var(--space-3);
}

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

.step {
    background: #F0FDF4;
    padding: var(--space-3);
    border-radius: var(--radius-base);
    color: #052e12;
    font-size: var(--font-size-sm);
    border-left: 4px solid #059669;
    margin: 0;
    font-family: 'Courier New', monospace;
}

/* Calculation Explanation */
.calculation-explanation {
    background: var(--color-white);
    padding: var(--space-4);
    border-radius: var(--radius-base);
    border: 1px solid #A7F3D0;
}

.explanation-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: #052e12;
    margin-bottom: var(--space-2);
}

.explanation-text {
    color: #052e12;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

/* Result Actions */
.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    margin-bottom: var(--space-4);
}

@media (max-width: 640px) {
    .result-actions {
        flex-direction: column;
    }
}

.action-btn {
    padding: var(--space-3) var(--space-4);
    background: #047857;
    color: white;
    border: 2px solid #059669;
    border-radius: var(--radius-base);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
}

.action-btn:hover {
    background: #059669;
    border-color: #047857;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(4, 120, 87, 0.3);
}

.share-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
    margin-bottom: var(--space-4);
}

.share-btn {
    padding: var(--space-2) var(--space-4);
    color: #052e12; /* Darker green for better contrast */
    background: var(--color-white);
    border: 1px solid #A7F3D0;
    border-radius: var(--radius-base);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

.share-btn:hover {
    background: #ECFDF5;
    border-color: #059669;
    color: #052e12;
    transform: translateY(-1px);
}

/* Reference Section (Hidden by default, shown after click) */
.reference-section {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border: 2px solid #A7F3D0;
    margin-top: var(--space-6);
}

.reference-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    text-align: center;
    border-bottom: 2px solid #A7F3D0;
    padding-bottom: var(--space-2);
}

.reference-table {
    background: var(--color-white);
    border-radius: var(--radius-base);
    overflow: hidden;
    border: 2px solid #A7F3D0;
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.1);
}

.reference-row {
    display: grid;
    grid-template-columns: 1fr 1fr 2fr;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    align-items: center;
    border-bottom: 1px solid #D1FAE5;
}

@media (max-width: 640px) {
    .reference-row {
        grid-template-columns: 1fr;
        gap: var(--space-1);
        text-align: center;
    }
}

.reference-row:last-child {
    border-bottom: none;
}

.reference-row.header {
    background: linear-gradient(135deg, #052e12 0%, #047857 100%);
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.reference-row:not(.header) {
    color: #052e12;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.reference-row:not(.header):nth-child(even) {
    background: #F0FDF4;
}

/* Options Section (Legacy support) */
.options-section {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 15px rgba(6, 78, 59, 0.1);
    overflow: hidden;
    border: 1px solid #A7F3D0;
}

.options-card {
    padding: var(--space-6);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-2);
}

.card-subtitle {
    color: #047857;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-6);
    line-height: var(--line-height-relaxed);
}

.options-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.form-row {
    position: relative;
    margin-bottom: var(--space-4);
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-checkbox {
    margin-right: var(--space-2);
    accent-color: #059669;
}

.form-help {
    color: #047857;
    font-size: var(--font-size-xs);
    margin-top: var(--space-1);
    display: block;
}

.range-desc {
    color: #052e12; /* Darker green for better contrast */
    font-size: var(--font-size-xs);
    margin-top: var(--space-1);
}

/* History Section */
.history-section {
    background: #F0FDF4;
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border: 1px solid #A7F3D0;
    margin-top: var(--space-8);
}

.history-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: #052e12;
    margin-bottom: var(--space-4);
    text-align: center;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    background: var(--color-white);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-base);
    border-left: 4px solid #059669;
    color: #052e12;
    font-size: var(--font-size-sm);
    box-shadow: 0 2px 4px rgba(5, 150, 105, 0.1);
}

.history-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--space-4);
}

.clear-history-btn {
    background: #DC2626;
    color: white;
    border: none;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-base);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-base);
}

.clear-history-btn:hover {
    background: #B91C1C;
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-heading {
        font-size: var(--font-size-2xl);
    }
    
    .calculator-input-container {
        padding: var(--space-4);
    }
    
    .main-converter-card {
        padding: var(--space-4);
    }
    
    .rounding-selector {
        justify-content: center;
    }
}

/* Accessibility Enhancements */
@media (prefers-reduced-motion: reduce) {
    .calc-btn,
    .action-btn,
    .rounding-btn,
    .share-btn {
        transition: none;
    }
    
    .calc-btn:hover,
    .action-btn:hover,
    .rounding-btn:hover,
    .share-btn:hover {
        transform: none;
    }
}

@media (prefers-contrast: high) {
    .main-converter-card {
        border: 3px solid #052e12;
    }
    
    .form-input {
        border-width: 3px;
    }
    
    .calc-btn.primary {
        background: #052e12;
        border: 2px solid #047857;
    }
}

/* Error Values Bar - Visual Scale Display */
.error-values-bar {
    background: linear-gradient(135deg, #ECFDF5 0%, #F0FDF4 100%);
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin: var(--space-4) 0;
    box-shadow: 0 4px 15px rgba(6, 78, 59, 0.1);
    animation: slideIn 0.3s ease-out;
    max-height: 140px;
    overflow: hidden;
}

.bar-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    text-align: center;
    margin-bottom: var(--space-6);
    border-bottom: 2px solid #059669;
    padding-bottom: var(--space-3);
}

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

.error-scale {
    min-width: 400px;
    position: relative;
    height: 80px;
}

.scale-labels {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.scale-label {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: #052e12;
    padding: var(--space-2) var(--space-3);
    background: #059669;
    color: white;
    border-radius: var(--radius-base);
}

.scale-bar {
    position: relative;
    height: 80px;
}

.scale-gradient {
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    height: 15px;
    background: linear-gradient(to right, 
        #10B981 0%,     /* Low Error - Green */
        #059669 25%,    /* Good - Darker Green */
        #F59E0B 50%,    /* Moderate - Yellow */
        #EF4444 75%,    /* High Error - Orange */
        #DC2626 100%    /* Very High Error - Red */
    );
    border-radius: var(--radius-base);
    border: 2px solid #052e12;
}

.error-markers {
    position: relative;
    height: 100%;
}

.error-marker {
    position: absolute;
    top: 0;
    transform: translateX(-50%);
}

.error-marker[data-percent="0"] { left: 5%; }
.error-marker[data-percent="5"] { left: 25%; }
.error-marker[data-percent="10"] { left: 45%; }
.error-marker[data-percent="15"] { left: 65%; }
.error-marker[data-percent="25"] { left: 85%; }

.marker-line {
    width: 3px;
    height: 50px;
    background: #052e12;
    margin: 0 auto;
    border-radius: var(--radius-base);
}

.marker-line.highlight {
    width: 5px;
    background: #DC2626;
    box-shadow: 0 0 10px rgba(220, 38, 38, 0.5);
    animation: pulse 2s infinite;
}

.marker-values {
    margin-top: var(--space-2);
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.marker-values.highlight {
    background: #DC2626;
    color: white;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-base);
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
}

.percent-value, .interpretation-value {
    display: block;
    color: #052e12;
}

.marker-values.highlight .percent-value,
.marker-values.highlight .interpretation-value {
    color: white;
}

.marker-label {
    font-size: var(--font-size-xs);
    color: #059669;
    text-align: center;
    margin-top: var(--space-1);
    font-weight: var(--font-weight-medium);
}

.current-error .marker-label {
    color: #DC2626;
    font-weight: var(--font-weight-bold);
}

/* Error Type Indicators */
.error-type-indicator {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-base);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin: var(--space-2) 0;
}

.error-type-indicator.overestimation {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    color: #92400E;
    border: 1px solid #F59E0B;
}

.error-type-indicator.underestimation {
    background: linear-gradient(135deg, #DBEAFE 0%, #BFDBFE 100%);
    color: #1E40AF;
    border: 1px solid #3B82F6;
}

.error-type-indicator.exact {
    background: linear-gradient(135deg, #D1FAE5 0%, #A7F3D0 100%);
    color: #065F46;
    border: 1px solid #10B981;
}

.error-type-icon {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
}

/* Interpretation Messages */
.interpretation-message {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-md);
    padding: var(--space-4);
    margin: var(--space-4) 0;
}

.interpretation-message.excellent {
    border-color: #10B981;
    background: linear-gradient(135deg, #D1FAE5 0%, #A7F3D0 100%);
}

.interpretation-message.good {
    border-color: #059669;
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
}

.interpretation-message.moderate {
    border-color: #F59E0B;
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
}

.interpretation-message.poor {
    border-color: #EF4444;
    background: linear-gradient(135deg, #FEE2E2 0%, #FECACA 100%);
}

.interpretation-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.interpretation-text {
    color: #047857;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

.interpretation-message.moderate .interpretation-text {
    color: #92400E;
}

.interpretation-message.poor .interpretation-text {
    color: #B91C1C;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

/* Enhanced Detailed Calculation Styles */
.calculation-method {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
}

.method-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    border-bottom: 2px solid #059669;
    padding-bottom: var(--space-2);
}

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

.method-step {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: white;
    border-radius: var(--radius-base);
    border-left: 4px solid #059669;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: #059669;
    color: white;
    border-radius: 50%;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

.step-instruction {
    font-size: var(--font-size-base);
    color: #052e12;
    font-weight: var(--font-weight-medium);
}

.formula-alternative {
    margin-top: var(--space-3);
    padding: var(--space-3);
    background: #ECFDF5;
    border-radius: var(--radius-base);
    border-left: 4px solid #10B981;
}

.alternative-label {
    color: #059669;
    font-weight: var(--font-weight-medium);
    margin-right: var(--space-2);
}

.alternative-formula {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-lg);
    color: #052e12;
    font-weight: var(--font-weight-bold);
}

.calculation-example {
    background: white;
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-md);
    padding: var(--space-6);
}

.example-intro {
    font-size: var(--font-size-base);
    color: #059669;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-4);
    text-align: center;
}

.step {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-md);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.step-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: #059669;
    margin-bottom: var(--space-2);
}

.step-calculation {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-2);
}

.final-result {
    background: #059669;
    color: white;
    padding: var(--space-3);
    border-radius: var(--radius-base);
    text-align: center;
}

.step-explanation {
    font-size: var(--font-size-sm);
    color: #047857;
    font-style: italic;
}

.additional-examples {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin: var(--space-6) 0;
}

.examples-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    text-align: center;
    border-bottom: 2px solid #059669;
    padding-bottom: var(--space-2);
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.example-card {
    background: white;
    border: 2px solid #A7F3D0;
    border-radius: var(--radius-md);
    padding: var(--space-4);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.example-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 78, 59, 0.15);
}

.example-values {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-3);
}

.example-calculation {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    color: #047857;
    margin-bottom: var(--space-3);
    line-height: 1.5;
}

.example-context {
    font-size: var(--font-size-xs);
    color: #059669;
    font-weight: var(--font-weight-medium);
    background: #ECFDF5;
    padding: var(--space-2);
    border-radius: var(--radius-base);
}

.pro-tips {
    background: linear-gradient(135deg, #052e12 0%, #047857 100%);
    color: white;
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin-top: var(--space-6);
}

.tips-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: white;
    margin-bottom: var(--space-4);
    text-align: center;
    border-bottom: 2px solid #10B981;
    padding-bottom: var(--space-2);
}

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

.tip {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-base);
    border-left: 4px solid #10B981;
}

.tip-icon {
    font-size: var(--font-size-xl);
    min-width: 32px;
}

.tip-text {
    font-size: var(--font-size-sm);
    color: white;
    line-height: 1.5;
}

/* Mobile Responsive Adjustments for Error Bar */
@media (max-width: 768px) {
    .error-scale {
        min-width: 500px;
        height: 100px;
    }
    
    .scale-gradient {
        height: 12px;
    }
    
    .marker-line {
        height: 35px;
    }
    
    .marker-values {
        font-size: var(--font-size-xs);
    }
    
    .marker-label {
        font-size: 10px;
    }
    
    .method-steps {
        gap: var(--space-2);
    }
    
    .method-step {
        flex-direction: column;
        text-align: center;
        gap: var(--space-2);
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .tip {
        flex-direction: column;
        text-align: center;
        gap: var(--space-2);
    }
    
    /* Mobile-only changes for calculator elements */
    .calculation-method {
        padding: 0;
        border: none;
    }
    
    .detailed-results {
        padding: 0.5rem;
        border: none;
    }
    
    .calculation-steps {
        padding: 0.5rem;
        border: none;
    }
    
    .calculation-example {
        padding: 0.5rem;
        border: none;
    }
    
    .additional-examples {
        padding: 0.5rem;
        border: none;
    }
}

/* Content Sections - Smart Layout with Dark Green Headings */
.error-guide-section,
.error-ranges-section {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    padding: var(--space-12) 0;
    margin: var(--space-8) 0;
    border-radius: var(--radius-lg);
}

.guide-content,
.ranges-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.section-heading {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: #052e12;
    text-align: center;
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, #052e12 0%, #059669 50%, #10B981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.section-heading::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #059669, #10B981);
    border-radius: 2px;
}

.section-text {
    font-size: var(--font-size-lg);
    color: #047857;
    line-height: 1.7;
    text-align: center;
    margin-bottom: var(--space-6);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.feature-item {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border: 2px solid #A7F3D0;
    box-shadow: 0 4px 16px rgba(6, 78, 59, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #059669, #10B981);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(6, 78, 59, 0.15);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, #052e12 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-desc {
    color: #047857;
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.feature-desc strong {
    color: #052e12;
    font-weight: var(--font-weight-bold);
}

.feature-desc ul {
    margin: var(--space-3) 0;
    padding-left: var(--space-6);
}

.feature-desc li {
    margin-bottom: var(--space-2);
    color: #047857;
}

/* Error Ranges Grid */
.ranges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.range-card {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border: 2px solid #A7F3D0;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
}

.range-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #059669, #10B981);
}

.range-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 78, 59, 0.15);
}

.range-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-3);
    background: linear-gradient(135deg, #052e12 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.range-desc {
    color: #047857;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
}

.range-note {
    color: #059669;
    font-size: var(--font-size-sm);
    font-style: italic;
}

/* Detailed Calculation Table Section */
.calculation-table-section {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    padding: var(--space-12) 0;
    margin: var(--space-8) 0;
    border-radius: var(--radius-lg);
}

.table-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.calculation-tables-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.table-card {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--space-6);
    border: 2px solid #A7F3D0;
    box-shadow: 0 4px 16px rgba(6, 78, 59, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
}

.table-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #059669, #10B981);
}

.table-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(6, 78, 59, 0.15);
}

.table-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    text-align: center;
    background: linear-gradient(135deg, #052e12 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.calculation-table {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(6, 78, 59, 0.1);
}

.calculation-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.calculation-table th {
    background: linear-gradient(135deg, #052e12 0%, #059669 100%);
    color: white;
    padding: var(--space-3);
    text-align: left;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.calculation-table th:first-child {
    border-top-left-radius: var(--radius-sm);
}

.calculation-table th:last-child {
    border-top-right-radius: var(--radius-sm);
}

.calculation-table td {
    padding: var(--space-3);
    border-bottom: 1px solid #E5E7EB;
    color: #047857;
    font-weight: var(--font-weight-medium);
}

.calculation-table tr:nth-child(even) {
    background-color: #F8FAFC;
}

.calculation-table tr:hover {
    background-color: #F0FDF4;
}

.calculation-table .highlight-row {
    background: linear-gradient(135deg, #DCFCE7 0%, #ECFDF5 100%) !important;
    font-weight: var(--font-weight-bold);
    color: #052e12;
}

.calculation-table .highlight-row:hover {
    background: linear-gradient(135deg, #BBF7D0 0%, #DCFCE7 100%) !important;
}

/* Guide Grid - Simplified Content */
.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.guide-card {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border: 2px solid #A7F3D0;
    box-shadow: 0 4px 15px rgba(5, 150, 105, 0.1);
    transition: transform 0.2s ease;
}

.guide-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(5, 150, 105, 0.15);
}

.guide-title {
    color: #052e12;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    border-bottom: 2px solid #10B981;
    padding-bottom: var(--space-2);
}

.guide-card ul {
    list-style: none;
    padding: 0;
}

.guide-card ul li {
    padding: var(--space-2) 0;
    color: #047857;
    position: relative;
    padding-left: var(--space-6);
}

.guide-card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10B981;
    font-weight: bold;
}

/* Tips Grid - Simplified */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-6);
}

.tip-card-simple {
    background: #F0FDF4;
    padding: var(--space-6);
    border-radius: var(--radius-md);
    border-left: 4px solid #10B981;
    transition: transform 0.2s ease;
}

.tip-card-simple:hover {
    transform: translateX(4px);
}

.tip-title-simple {
    color: #052e12;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-3);
}

.tip-card-simple ul {
    list-style: none;
    padding: 0;
}

.tip-card-simple ul li {
    padding: var(--space-1) 0;
    color: #047857;
    position: relative;
    padding-left: var(--space-6);
}

.tip-card-simple ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: #10B981;
    font-weight: bold;
}

/* Section Headings - Consistent Green Style */
.section-heading {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    text-align: center;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-4);
    border-bottom: 3px solid #059669;
}

/* FAQ Questions - Consistent Green Style */
.faq-question {
    color: #052e12;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-3);
}

/* Table Tips Section */
.table-tips {
    margin-top: var(--space-10);
    padding: var(--space-6);
    background: white;
    border-radius: var(--radius-md);
    border: 2px solid #A7F3D0;
    position: relative;
    overflow: hidden;
}

.table-tips::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #059669, #10B981);
}

.tips-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: white;
    text-align: center;
    margin-bottom: var(--space-6);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.tip-card {
    background: #F8FAFC;
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    border-left: 4px solid #10B981;
    transition: transform 0.2s ease;
}

.tip-card:hover {
    transform: translateX(4px);
}

.tip-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-2);
}

.tip-desc {
    color: #047857;
    line-height: 1.6;
    font-size: var(--font-size-sm);
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
    .section-heading {
        font-size: 2rem;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .ranges-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .feature-item,
    .range-card {
        padding: var(--space-4);
    }
    
    .guide-content,
    .ranges-content {
        padding: 0 var(--space-3);
    }
    
    .calculation-tables-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .table-card {
        padding: var(--space-4);
    }
    
    .table-content {
        padding: 0 var(--space-3);
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .calculation-table {
        font-size: 12px;
    }
    
    .calculation-table th,
    .calculation-table td {
        padding: var(--space-2);
    }
}

/* === FIX 1: TABLES LAYOUT - 2 tables per row on desktop === */
.detailed-tables-section {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    padding: var(--space-12) 0;
}

.detailed-tables-section .content-heading {
    /* Heading stays full width outside grid */
    grid-column: 1 / -1;
    margin-bottom: var(--space-8);
}

.detailed-tables-section .tables-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

@media (min-width: 768px) {
    .detailed-tables-section .tables-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-6);
    }
}

@media (max-width: 767px) {
    .detailed-tables-section .tables-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
}

/* Fix existing calculation-table-wrapper styling */
.calculation-table-wrapper {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--space-6);
    border: 2px solid #A7F3D0;
    box-shadow: 0 4px 16px rgba(6, 78, 59, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
    margin-bottom: 0; /* Reset margin since we're using grid gap */
}

.calculation-table-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #059669, #10B981);
}

.calculation-table-wrapper:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(6, 78, 59, 0.15);
}

.table-heading {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-4);
    text-align: center;
    background: linear-gradient(135deg, #052e12 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === FIX 2: LANGUAGE SWITCHER DROPDOWN - Fix visibility on all pages === */
.language-switcher__dropdown {
    position: absolute !important;
    top: 100% !important;
    right: 0 !important;
    min-width: 180px !important;
    background: #ffffff !important;
    border: 1px solid #e2e8f0 !important;
    border-radius: 6px !important;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05) !important;
    list-style: none !important;
    margin: 4px 0 0 !important;
    padding: 8px 0 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transform: translateY(-8px) !important;
    transition: all 0.15s ease !important;
    z-index: 9999 !important;
    display: block !important;
    pointer-events: auto !important;
}

.language-switcher__toggle[aria-expanded="true"] + .language-switcher__dropdown,
.language-switcher__toggle[aria-expanded="true"] ~ .language-switcher__dropdown {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    display: block !important;
    pointer-events: auto !important;
}

.language-switcher__dropdown[style*="display: block"],
.language-switcher__dropdown.show {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    pointer-events: auto !important;
}

.language-switcher__link {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    padding: 8px 16px !important;
    color: #374151 !important;
    text-decoration: none !important;
    transition: background-color 0.15s ease !important;
    font-size: 14px !important;
}

.language-switcher__link:hover {
    background-color: #f3f4f6 !important;
    color: #047857 !important;
    text-decoration: none !important;
}

/* === FIX 3: COMMON CALCULATION MISTAKES CSS - Comprehensive styling === */
/* DEFINITIVE FIX: Common Calculation Mistakes - Full Browser Width */
.mistakes-section {
    background: linear-gradient(135deg, #FEF3C7 0%, #FEF7CD 100%);
    padding: var(--space-10) 0;
    margin: var(--space-12) 0;
    border-top: 4px solid #F59E0B;
    border-bottom: 4px solid #F59E0B;
    position: relative;
    overflow: hidden;
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
}

.mistakes-section .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.mistakes-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #F59E0B, #FBBF24);
}

.mistakes-heading {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: #92400E;
    text-align: center;
    margin-bottom: var(--space-8);
    background: linear-gradient(135deg, #92400E 0%, #D97706 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    padding-bottom: var(--space-4);
}

.mistakes-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #F59E0B, #FBBF24);
    border-radius: var(--radius-base);
}

.mistakes-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}

@media (min-width: 640px) {
    .mistakes-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .mistakes-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.mistake-item {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--space-5);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.15);
    border: 1px solid #FCD34D;
    transition: all 0.2s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    overflow: hidden;
}

.mistake-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #EF4444, #F59E0B);
}

.mistake-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.2);
    border-color: #F59E0B;
}

.mistake-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-radius: 50%;
    border: 2px solid #FCD34D;
    flex-shrink: 0;
}

.mistake-content {
    flex: 1;
    width: 100%;
    min-height: 0;
}

.mistake-content h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #92400E;
    margin-bottom: var(--space-3);
    line-height: var(--line-height-tight);
}

.mistake-content p {
    color: #B45309;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

.mistake-content strong {
    color: #92400E;
    font-weight: var(--font-weight-bold);
}

.mistake-badge {
    display: inline-block;
    background: #DC2626;
    color: white;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-base);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-3);
    align-self: flex-start;
}

/* Mobile Responsive for Mistakes Section */
@media (max-width: 768px) {
    .mistakes-section {
        padding: var(--space-4) var(--space-2);
    }
    
    .mistakes-section .container {
        padding: 0 var(--space-2);
    }
    
    .mistakes-heading {
        font-size: var(--font-size-lg);
        padding: 0 var(--space-1);
    }
    
    .mistake-item {
        padding: var(--space-3);
    }
    
    .mistake-content h4 {
        font-size: var(--font-size-base);
    }
    
    .mistake-content p {
        font-size: var(--font-size-xs);
    }
}

/* === EXPERT VALIDATION SECTION === */
.expert-validation-section {
    background: linear-gradient(135deg, #065F46 0%, #047857 50%, #059669 100%);
    padding: var(--space-16) 0;
    color: white;
}

.validation-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.validation-header {
    margin-bottom: var(--space-12);
}

.validation-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-6);
    color: white;
}

.verification-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: rgba(255, 255, 255, 0.2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.badge-icon {
    font-size: var(--font-size-lg);
}

.badge-text {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    letter-spacing: 0.05em;
}

.professor-endorsement {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    padding: var(--space-4);
    margin: var(--space-4) 0;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.professor-image {
    flex-shrink: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.professor-photo {
    width: 150px;
    height: 150px;
    border-radius: 100px;
    object-fit: cover;
}

.linkedin-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 4px;
    transition: opacity 0.2s;
}

.linkedin-link:hover {
    opacity: 0.8;
}

.endorsement-content {
    flex: 1;
    min-width: 0;
}

.professor-quote {
    font-size: 1rem;
    color: #fff;
    line-height: 1.4;
    margin: 0 0 var(--space-2) 0;
    font-style: italic;
    font-style: italic;
}

.professor-info {
    margin-top: var(--space-1);
}

.validation-buttons {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.validation-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-xs);
    color: #052e12;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.check-icon {
    background: #10B981;
    color: white;
    border-radius: 50%;
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: bold;
}

.professor-name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin-bottom: var(--space-1);
}

.professor-title {
    font-size: var(--font-size-base);
    color: #eee;
}

.validation-checkpoints {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-8);
}

.checkpoint {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-4);
    border-radius: var(--radius-base);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.checkpoint-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: #10B981;
    border-radius: 50%;
    color: white;
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
}

.checkpoint-text {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

/* === EDUCATIONAL PURPOSE SECTION === */
.educational-purpose-section {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 50%, #F59E0B 100%);
    padding: var(--space-16) 0;
    margin: var(--space-12) 0;
    color: #92400E;
}

.educational-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.educational-header {
    margin-bottom: var(--space-12);
}

.educational-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    color: #92400E;
}

.educational-subtitle {
    font-size: var(--font-size-lg);
    color: #B45309;
    font-weight: var(--font-weight-medium);
}

.educational-description {
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin: var(--space-8) 0;
    border: 2px solid rgba(181, 83, 9, 0.2);
}

.educational-text {
    font-size: var(--font-size-lg);
    line-height: 1.7;
    color: #78350F;
    margin: 0;
}

.learning-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
    margin: var(--space-12) 0;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    background: rgba(255, 255, 255, 0.8);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 2px solid rgba(181, 83, 9, 0.2);
    text-align: left;
}

.feature-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
    margin-top: var(--space-1);
}

.feature-content h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-2);
    color: #92400E;
}

.feature-content p {
    font-size: var(--font-size-base);
    color: #B45309;
    margin: 0;
    line-height: 1.5;
}

.educational-disclaimer {
    background: rgba(146, 64, 14, 0.1);
    border: 2px solid rgba(146, 64, 14, 0.3);
    border-radius: var(--radius-base);
    padding: var(--space-6);
    margin-top: var(--space-8);
}

.disclaimer-text {
    font-size: var(--font-size-base);
    color: #92400E;
    margin: 0;
    line-height: 1.6;
}

/* Mobile Responsive Design for New Sections */
@media (max-width: 768px) {
    .expert-validation-section,
    .educational-purpose-section {
        padding: var(--space-12) 0;
        margin: var(--space-8) 0;
    }
    
    .validation-title,
    .educational-title {
        font-size: var(--font-size-2xl);
        color: #052e12 !important;
    }
    
    .professor-endorsement,
    .educational-description {
        padding: var(--space-6);
        margin: var(--space-6) 0;
    }
    
    .endorsement-quote,
    .educational-text {
        font-size: var(--font-size-base);
        color: #052e12 !important;
    }
    
    /* Smart mobile design for Expert Validation section */
    .validation-content {
        padding: 1rem;
        background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
        border-radius: 12px;
        border: 1px solid #A7F3D0;
        margin: 0 0.5rem;
        color: #052e12 !important;
    }
    
    .validation-content * {
        color: #052e12 !important;
    }
    
    .professor-endorsement {
        flex-direction: column;
        max-height: none;
        padding: 1rem;
        background: white;
        border-radius: 4px;
        border: 1px solid #A7F3D0;
        margin-top: 1rem;
        gap: var(--space-3);
        text-align: center;
    }
    
    .professor-endorsement * {
        color: #052e12 !important;
    }
    
    .professor-image {
        order: 1;
        align-self: center;
    }
    
    .endorsement-content {
        order: 2;
        flex: none;
        min-width: auto;
    }
    
    .validation-buttons {
        order: 3;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }
    
    .validation-item {
        font-size: 0.75rem;
        padding: 0.25rem 0.5rem;
        flex: 0 0 auto;
    }
        height: 60px;
        background: linear-gradient(135deg, #059669 0%, #047857 100%);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 24px;
        flex-shrink: 0;
    }
    
    .professor-details h3 {
        margin: 0;
        font-size: 1rem;
        color: #052e12;
    }
    
    .professor-details .title {
        font-size: 0.8rem;
        color: #059669;
        margin: 0;
    }
    
    .verification-badge {
        background: #10B981;
        color: white;
        padding: 0.25rem 0.5rem;
        border-radius: 20px;
        font-size: 0.7rem;
        font-weight: bold;
        margin-top: 0.5rem;
        display: inline-block;
    }
    
    /* Smart mobile design for Educational Purpose section */
    .educational-content {
        padding: 1rem;
        background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
        border-radius: 12px;
        border: 1px solid #C7D2FE;
        margin: 0 0.5rem;
    }
    
    .learning-features {
        display: grid;
        gap: 0.75rem;
        margin-top: 1rem;
    }
    
    .feature {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding: 0.75rem;
        background: white;
        border-radius: 4px;
        border: 1px solid #C7D2FE;
        text-align: left;
    }
    
    .feature-icon {
        width: 40px;
        height: 40px;
        background: linear-gradient(135deg, #3B82F6 0%, #1E40AF 100%);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 18px;
        flex-shrink: 0;
    }
    
    .feature-content {
        flex: 1;
    }
    
    .feature-content h4 {
        color: #1E3A8A;
        font-size: 0.9rem;
        margin: 0 0 0.25rem 0;
    }
    
    .feature-content p {
        margin: 0;
        font-size: 0.8rem;
        color: #475569;
        line-height: 1.4;
    }
}

/* Extra small devices (phones) */
@media (max-width: 480px) {
    .expert-validation-section,
    .educational-purpose-section {
        padding: var(--space-8) 0;
    }
    
    .expert-validation-section * {
        color: #052e12 !important;
    }
    
    .professor-endorsement {
        flex-direction: column;
        max-height: none;
        padding: 0.75rem;
        gap: 0.5rem;
        text-align: center;
        background: white !important;
    }
    
    .professor-endorsement * {
        color: #052e12 !important;
    }
    
    .professor-image {
        order: 1;
        align-self: center;
    }
    
    .professor-photo {
        width: 50px;
        height: 50px;
    }
    
    .linkedin-link {
        width: 18px;
        height: 18px;
    }
    
    .endorsement-content {
        order: 2;
        flex: none;
        min-width: auto;
    }
    
    .professor-quote {
        font-size: var(--font-size-xs);
        line-height: 1.3;
        margin: 0 0 0.5rem 0;
    }
    
    .professor-name {
        font-size: var(--font-size-sm);
    }
    
    .professor-title {
        font-size: var(--font-size-xs);
    }
    
    .validation-buttons {
        order: 3;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.25rem;
    }
    
    .validation-item {
        font-size: 0.65rem;
        padding: 0.2rem 0.35rem;
        flex: 0 0 auto;
        background: white !important;
        color: #052e12 !important;
        border: 1px solid #A7F3D0;
    }
    
    .check-icon {
        width: 10px;
        height: 10px;
        font-size: 7px;
    }
    
    .validation-title,
    .educational-title {
        font-size: var(--font-size-xl);
    }
    
    .professor-endorsement,
    .educational-description,
    .feature {
        padding: var(--space-4);
    }
    
    .quote-mark {
        font-size: 2.5rem;
    }
}

/* Print Styles */
@media print {
    .calculator-section {
        background: white;
        box-shadow: none;
    }
    
    .action-buttons,
    .result-actions,
    .share-options {
        display: none;
    }
    
    .main-converter-card {
        box-shadow: none;
        border: 2px solid #052e12;
    }
    
    .error-guide-section,
    .error-ranges-section {
        background: white;
        box-shadow: none;
        border: 1px solid #A7F3D0;
    }
    
    .expert-validation-section {
        background: #f8f9fa;
        color: #052e12;
    }
    
    .educational-purpose-section {
        background: #fffbeb;
        color: #92400E;
    }
    
    .feature-item:hover,
    .range-card:hover {
        transform: none;
        box-shadow: none;
    }
}

/* Simple Content Sections */
.simple-content-section {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.content-heading {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, #052e12 0%, #047857 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin-bottom: var(--space-8);
    line-height: var(--line-height-tight);
    position: relative;
}

.content-heading::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #052e12 0%, #047857 100%);
    margin: var(--space-4) auto 0;
    border-radius: var(--radius-full);
}

.content-subheading {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #052e12;
    margin: var(--space-10) 0 var(--space-4) 0;
    text-align: left;
    border-left: 4px solid #059669;
    padding-left: var(--space-4);
}

.content-paragraph {
    font-size: var(--font-size-lg);
    color: #052e12;
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-6);
    text-align: left;
    font-weight: var(--font-weight-normal);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .simple-content-section {
        padding: var(--space-12) 0;
    }
    
    .content-wrapper {
        padding: 0 var(--space-3);
    }
    
    .content-heading {
        font-size: var(--font-size-2xl);
        margin-bottom: var(--space-6);
    }
    
    .content-subheading {
        font-size: var(--font-size-lg);
        margin: var(--space-8) 0 var(--space-3) 0;
        padding-left: var(--space-3);
    }
    
    .content-paragraph {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-4);
    }
}

/* Professor Endorsement Section */
.professor-endorsement-section {
    background: linear-gradient(135deg, #064E3B 0%, #065F46 100%);
    padding: var(--space-16) 0;
    margin-top: var(--space-8);
}

.endorsement-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(6, 78, 59, 0.2);
    overflow: hidden;
    border: 2px solid #10B981;
    max-width: 900px;
    margin: 0 auto;
}

.endorsement-header {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    padding: var(--space-6);
    text-align: center;
}

.endorsement-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin: 0;
}

.endorsement-content {
    padding: var(--space-8);
}

.professor-quote blockquote {
    background: #F0FDF4;
    padding: var(--space-6);
    border-left: 4px solid #059669;
    border-radius: var(--radius-md);
    margin: 0 0 var(--space-6) 0;
    font-style: italic;
}

.professor-quote blockquote p {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: #052e12;
    margin: 0;
}

.professor-attribution {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.professor-info {
    font-size: var(--font-size-base);
    color: #052e12;
}

.professor-info strong {
    font-size: var(--font-size-lg);
    color: #059669;
}

.professor-dept, .professor-specialty {
    font-size: var(--font-size-sm);
    color: #6B7280;
}

.verification-badge {
    background: #10B981;
    color: var(--color-white);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.validation-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.validation-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: #ECFDF5;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid #A7F3D0;
}

.check-icon {
    color: #059669;
    font-weight: bold;
    font-size: var(--font-size-lg);
}

/* Educational Notice Section */
.educational-notice-section {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    padding: var(--space-16) 0;
}

.notice-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 25px rgba(217, 119, 6, 0.15);
    overflow: hidden;
    border: 2px solid #F59E0B;
    max-width: 900px;
    margin: 0 auto;
}

.notice-header {
    background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
    padding: var(--space-6);
    text-align: center;
}

.notice-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin: 0;
}

.notice-content {
    padding: var(--space-8);
}

.notice-content > p {
    font-size: var(--font-size-lg);
    color: #92400E;
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-6);
}

.educational-features {
    display: grid;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    background: #FFFBEB;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid #FDE68A;
}

.feature-icon {
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.feature-text {
    color: #92400E;
    line-height: var(--line-height-relaxed);
}

.feature-text strong {
    color: #D97706;
    display: block;
    margin-bottom: var(--space-1);
}

.disclaimer-text {
    background: #F3F4F6;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border-left: 4px solid #6B7280;
}

.disclaimer-text p {
    color: #6B7280;
    font-size: var(--font-size-sm);
    margin: 0;
    line-height: var(--line-height-relaxed);
}

/* Mobile responsive for new sections */
@media (max-width: 768px) {
    .professor-endorsement-section,
    .educational-notice-section {
        padding: var(--space-12) 0;
    }
    
    .endorsement-card,
    .notice-card {
        margin: 0 var(--space-4);
    }
    
    .endorsement-content,
    .notice-content {
        padding: var(--space-6);
    }
    
    .endorsement-title,
    .notice-title {
        font-size: var(--font-size-xl);
    }
    
    .professor-attribution {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .validation-points {
        grid-template-columns: 1fr;
    }
    
    .feature-item {
        flex-direction: column;
        gap: var(--space-2);
    }
}