/* Global Variables and Reset */
:root {
    --bg-primary: #F5F5F5;
    --panel-primary: #E0E0E0;
    --text-primary: #222222;
    --accent-primary: #4A90E2;
    --accent-secondary: #FF9500;
    --input-bg: #f9f9f9;
    --border-primary: #333333;
    --error-primary: #d32f2f;
    --warning-primary: #f57c00;
    --success-primary: #388e3c;
    --neutral-axis: #555555;
    --load-color: #1565c0;
    --deflection-color: #d32f2f;
    --max-deflection: #1976d2;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
    --radius-sm: 4px;
    --radius-md: 6px;
    --transition-base: all 0.2s ease;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.beam-deflection-calculator-container.colorblind-enabled {
    --accent-primary: #0066CC;
    --accent-secondary: #CC7722;
    --load-color: #0066CC;
    --deflection-color: #CC0000;
    --max-deflection: #0066CC;
}

.beam-deflection-calculator-container * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.beam-deflection-calculator-container {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    padding: 20px;
    min-height: 100vh;
}

/* Layout System */
.beam-deflection-calculator-container .calculator-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    max-width: 1600px;
    margin: 0 auto;
}

@media (min-width: 1200px) {
    .beam-deflection-calculator-container .calculator-container {
        grid-template-columns: 1fr 1fr;
    }
}

/* Panel System */
.beam-deflection-calculator-container .calculator-panel {
    background-color: var(--panel-primary);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.beam-deflection-calculator-container .calculator-panel:hover {
    box-shadow: var(--shadow-md);
}

/* Header System */
.beam-deflection-calculator-container .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-primary);
}

.beam-deflection-calculator-container .panel-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.beam-deflection-calculator-container .panel-subtitle {
    font-size: 14px;
    color: #666;
    margin-top: 4px;
    font-weight: 400;
}

/* Colorblind Toggle */
.beam-deflection-calculator-container .accessibility-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 0;
    flex-shrink: 0;
}

.beam-deflection-calculator-container .toggle-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.beam-deflection-calculator-container .toggle-switch {
    position: relative;
    width: 50px;
    height: 26px;
}

.beam-deflection-calculator-container .toggle-checkbox {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.beam-deflection-calculator-container .toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: var(--transition-base);
    border-radius: 34px;
}

.beam-deflection-calculator-container .toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition-base);
    border-radius: 50%;
}

.beam-deflection-calculator-container .toggle-checkbox:checked + .toggle-slider {
    background-color: var(--accent-primary);
}

.beam-deflection-calculator-container .toggle-checkbox:checked + .toggle-slider:before {
    transform: translateX(24px);
}

/* Form Grid System */
.beam-deflection-calculator-container .form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .beam-deflection-calculator-container .form-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Form Controls */
.beam-deflection-calculator-container .form-group {
    margin-bottom: 20px;
}

.beam-deflection-calculator-container .form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.beam-deflection-calculator-container .form-hint {
    display: block;
    font-size: 12px;
    color: #666;
    margin-bottom: 6px;
    font-style: italic;
    line-height: 1.4;
}

.beam-deflection-calculator-container .form-input,
.beam-deflection-calculator-container .form-select {
    width: 100%;
    padding: 12px 14px !important;
    border: 2px solid var(--border-primary) !important;
    border-radius: var(--radius-sm) !important;
    background-color: var(--input-bg) !important;
    font-size: 15px !important;
    color: var(--text-primary) !important;
    transition: var(--transition-base) !important;
    height: auto !important;
    min-height: 46px !important;
    line-height: 1.5 !important;
}

.beam-deflection-calculator-container .form-input:focus,
.beam-deflection-calculator-container .form-select:focus {
    outline: none !important;
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2) !important;
}

.beam-deflection-calculator-container .form-input[type="number"] {
    -moz-appearance: textfield;
}

.beam-deflection-calculator-container .form-input[type="number"]::-webkit-outer-spin-button,
.beam-deflection-calculator-container .form-input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Material Section Styling */
.beam-deflection-calculator-container .material-section {
    background: rgba(255, 255, 255, 0.5);
    padding: 15px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    border-left: 4px solid var(--accent-primary);
}

.beam-deflection-calculator-container .material-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 10px;
}

/* Cross-section Styling */
.beam-deflection-calculator-container .section-type-group {
    margin-bottom: 20px;
}

.beam-deflection-calculator-container .dimension-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 10px;
}

/* Load Configuration */
.beam-deflection-calculator-container .load-configuration {
    background: rgba(255, 255, 255, 0.5);
    padding: 15px;
    border-radius: var(--radius-sm);
    margin-top: 10px;
    border-left: 4px solid var(--accent-secondary);
}

/* Action Buttons */
.beam-deflection-calculator-container .action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    padding-top: 20px;
    flex-wrap: wrap;
    border-top: 1px solid #ddd;
}

.beam-deflection-calculator-container .action-btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    flex: 1;
    min-width: 140px;
    text-align: center;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.beam-deflection-calculator-container .btn-primary {
    background-color: var(--accent-primary);
    color: white;
}

.beam-deflection-calculator-container .btn-primary:hover:not(:disabled) {
    background-color: #357ABD;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.beam-deflection-calculator-container .btn-secondary {
    background-color: var(--accent-secondary);
    color: white;
}

.beam-deflection-calculator-container .btn-secondary:hover:not(:disabled) {
    background-color: #E08500;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.beam-deflection-calculator-container .btn-outline {
    background-color: transparent;
    border: 2px solid var(--border-primary);
    color: var(--text-primary);
}

.beam-deflection-calculator-container .btn-outline:hover:not(:disabled) {
    background-color: rgba(0, 0, 0, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.beam-deflection-calculator-container .action-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Validation Messages */
.beam-deflection-calculator-container .validation-error {
    color: var(--error-primary);
    font-size: 12px;
    margin-top: 5px;
    display: none;
    font-weight: 500;
}

.beam-deflection-calculator-container .validation-warning {
    color: var(--warning-primary);
    font-size: 12px;
    margin-top: 5px;
    display: none;
    font-style: italic;
}

/* Results Panel */
.beam-deflection-calculator-container .results-panel {
    display: none;
}

.beam-deflection-calculator-container .results-header {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-primary);
}

.beam-deflection-calculator-container .results-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.beam-deflection-calculator-container .results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

/* Summary Cards */
.beam-deflection-calculator-container .summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.beam-deflection-calculator-container .summary-card {
    background-color: var(--input-bg);
    padding: 20px;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--accent-primary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.beam-deflection-calculator-container .summary-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.beam-deflection-calculator-container .card-label {
    font-size: 12px;
    color: #666;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.beam-deflection-calculator-container .card-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.beam-deflection-calculator-container .card-unit {
    font-size: 14px;
    color: #666;
    margin-left: 4px;
    font-weight: 400;
}

.beam-deflection-calculator-container .card-note {
    font-size: 12px;
    color: #666;
    margin-top: 8px;
    font-style: italic;
}

/* SVG Visualization */
.beam-deflection-calculator-container .visualization-container {
    background-color: white;
    padding: 20px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    position: relative;
}

.beam-deflection-calculator-container .visualization-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.beam-deflection-calculator-container .beam-svg {
    width: 100%;
    height: 260px;
    display: block;
    margin: 0 auto;
}

/* Calculation Steps */
.beam-deflection-calculator-container .calculation-steps {
    background-color: var(--input-bg);
    padding: 25px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.beam-deflection-calculator-container .steps-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.beam-deflection-calculator-container .step-container {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.beam-deflection-calculator-container .step-container:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.beam-deflection-calculator-container .step-header {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
}

.beam-deflection-calculator-container .step-content {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
    background-color: white;
    padding: 15px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-top: 10px;
    border-left: 3px solid var(--accent-primary);
    font-size: 13px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Dynamic Analysis */
.beam-deflection-calculator-container .analysis-container {
    background-color: var(--input-bg);
    padding: 25px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.beam-deflection-calculator-container .analysis-section {
    margin-bottom: 25px;
}

.beam-deflection-calculator-container .analysis-section:last-child {
    margin-bottom: 0;
}

.beam-deflection-calculator-container .analysis-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.beam-deflection-calculator-container .analysis-content {
    line-height: 1.6;
    color: #444;
    font-size: 14px;
}

/* Warnings and Info Boxes */
.beam-deflection-calculator-container .message-box {
    padding: 15px;
    border-radius: var(--radius-sm);
    margin: 15px 0;
    border-left: 4px solid;
}

.beam-deflection-calculator-container .message-warning {
    background-color: rgba(245, 124, 0, 0.1);
    border-left-color: var(--warning-primary);
}

.beam-deflection-calculator-container .message-info {
    background-color: rgba(74, 144, 226, 0.1);
    border-left-color: var(--accent-primary);
}

.beam-deflection-calculator-container .message-title {
    font-weight: 600;
    margin-bottom: 5px;
    font-size: 14px;
}

/* Disclaimer */
.beam-deflection-calculator-container .disclaimer-box {
    background-color: rgba(51, 51, 51, 0.05);
    border: 1px solid var(--border-primary);
    padding: 20px;
    border-radius: var(--radius-sm);
    margin-top: 30px;
    font-size: 13px;
    line-height: 1.6;
}

.beam-deflection-calculator-container .disclaimer-title {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 14px;
}

/* Trademark */
.beam-deflection-calculator-container .trademark {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 12px;
    color: #666;
    opacity: 0.7;
    font-family: 'SF Mono', Monaco, monospace;
}

/* Colorblind Enhancements */
.beam-deflection-calculator-container.colorblind-enabled .action-btn::before {
    content: "";
    display: inline-block;
    width: 20px;
    height: 20px;
    margin-right: 8px;
    background-color: currentColor;
    opacity: 0.2;
    border-radius: 4px;
}

.beam-deflection-calculator-container.colorblind-enabled .btn-primary::before {
    border-radius: 50%;
}

.beam-deflection-calculator-container.colorblind-enabled .btn-secondary::before {
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.beam-deflection-calculator-container.colorblind-enabled .btn-outline::before {
    clip-path: polygon(20% 0%, 80% 0%, 100% 50%, 80% 100%, 20% 100%, 0% 50%);
}

.beam-deflection-calculator-container.colorblind-enabled .form-input,
.beam-deflection-calculator-container.colorblind-enabled .form-select {
    border-style: solid;
    border-width: 2px;
    background-image: linear-gradient(45deg, transparent 50%, rgba(0,0,0,0.05) 50%);
    background-size: 4px 4px;
}

.beam-deflection-calculator-container.colorblind-enabled .validation-error::before {
    content: "✗ ";
}

.beam-deflection-calculator-container.colorblind-enabled .validation-warning::before {
    content: "⚠ ";
}

/* Responsive Adjustments */
@media (max-width: 480px) {
    .beam-deflection-calculator-container .calculator-panel {
        padding: 20px;
    }
    
    .beam-deflection-calculator-container .action-buttons {
        flex-direction: column;
    }
    
    .beam-deflection-calculator-container .action-btn {
        min-width: 100%;
    }
    
    .beam-deflection-calculator-container .summary-cards {
        grid-template-columns: 1fr;
    }
    
    .beam-deflection-calculator-container .panel-header {
        flex-direction: column;
        gap: 15px;
    }
    
    .beam-deflection-calculator-container .accessibility-toggle {
        align-self: flex-start;
    }
}

/* Print Styles */
@media print {
    .beam-deflection-calculator-container .calculator-panel {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .beam-deflection-calculator-container .action-buttons {
        display: none;
    }
    
    .beam-deflection-calculator-container .trademark {
        text-align: center;
        margin-top: 20px;
    }
}

/* Ensure dropdowns show full text */
.beam-deflection-calculator-container .form-select option {
    padding: 8px;
    height: auto;
    line-height: 1.5;
}

/* Ensure input fields have proper visibility */
.beam-deflection-calculator-container input[type="number"],
.beam-deflection-calculator-container input[type="text"] {
    min-height: 46px;
    line-height: 1.5;
    padding: 12px 14px !important;
}

/* Prevent overlap in dimension grid */
.beam-deflection-calculator-container .dimension-grid .form-group {
    margin-bottom: 15px;
}

/* Ensure proper spacing between form groups */
.beam-deflection-calculator-container .form-group {
    margin-bottom: 20px;
}

/* Clear visibility for selected dropdown text */
.beam-deflection-calculator-container .form-select:not([size]):not([multiple]) {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='4' height='5' viewBox='0 0 4 5'%3e%3cpath fill='%23333' d='M2 0L0 2h4zm0 5L0 3h4z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 8px 10px;
}