/* CSS Variables for Color Palette */
:root {
    --primary-gold: #D4AC0D;
    --secondary-olive: #8D8741;
    --accent-blue: #659DBD;
    --warm-tan: #DAAD86;
    --light-cream: #FBEEC1;
    
    /* Semantic Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    
    /* Status Colors */
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: var(--accent-blue);
    
    /* Shadows and Transitions */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --transition: all 0.3s ease;
    
    /* Border Radius */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

/* Organic Design Elements */
.organic-shape {
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
}

.organic-border {
    border-radius: var(--border-radius-xl);
    position: relative;
    overflow: hidden;
}

.organic-border::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-gold), var(--accent-blue), var(--warm-tan));
}

/* Header Styles */
.header-section {
    background: linear-gradient(135deg, var(--light-cream) 0%, var(--warm-tan) 100%);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1020;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary) !important;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    color: var(--primary-gold);
    font-size: 1.8rem;
}

/* Hero Section */
.hero-section {
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--light-cream) 0%, rgba(218, 173, 134, 0.3) 100%);
    border-radius: var(--border-radius-xl);
    margin-bottom: 2rem;
}

.hero-section .display-4 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-section .lead {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.hero-stats {
    margin-top: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.stat-card i {
    color: var(--primary-gold);
    font-size: 1.2rem;
}

/* Calculator Card */
.calculator-card {
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
}

.calculator-card .card-header {
    background: linear-gradient(135deg, var(--primary-gold), var(--secondary-olive));
    color: white;
    border: none;
    padding: 1.5rem;
}

.calculator-card .card-body {
    padding: 2rem;
    background: var(--bg-primary);
}

/* Form Styles */
.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
}

.form-control, .form-select {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-gold);
    box-shadow: 0 0 0 0.2rem rgba(212, 172, 13, 0.25);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-control.is-invalid, .form-select.is-invalid {
    border-color: var(--danger-color);
}

.form-control.is-valid, .form-select.is-valid {
    border-color: var(--success-color);
}

/* Button Styles */
.btn {
    border-radius: var(--border-radius-md);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-gold), var(--secondary-olive));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-olive), var(--primary-gold));
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    border: 2px solid var(--primary-gold);
    color: var(--primary-gold);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-gold);
    color: white;
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border: 2px solid var(--text-secondary);
    color: var(--text-secondary);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--text-secondary);
    color: white;
}

/* Results Section */
.results-section {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Result Cards */
.result-card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
}

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

.result-card.status-optimal {
    border-left: 5px solid var(--success-color);
}

.result-card.status-borderline {
    border-left: 5px solid var(--warning-color);
}

.result-card.status-high {
    border-left: 5px solid var(--danger-color);
}

.result-card.status-low {
    border-left: 5px solid var(--info-color);
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.result-status {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-range {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: var(--border-radius-sm);
    background-color: var(--border-color);
    overflow: hidden;
}

.progress-bar {
    border-radius: var(--border-radius-sm);
    transition: width 0.8s ease;
}

/* Chart Container */
.chart-container {
    position: relative;
    height: 300px;
    margin: 1rem 0;
}

#cholesterolChart {
    max-width: 100%;
    height: auto;
}

/* Assessment Cards */
.assessment-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.assessment-card.risk-low {
    border-color: var(--success-color);
    background: rgba(40, 167, 69, 0.05);
}

.assessment-card.risk-moderate {
    border-color: var(--warning-color);
    background: rgba(255, 193, 7, 0.05);
}

.assessment-card.risk-high {
    border-color: var(--danger-color);
    background: rgba(220, 53, 69, 0.05);
}

/* Recommendations */
.recommendation-item {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-left: 4px solid var(--accent-blue);
}

.recommendation-item h6 {
    color: var(--primary-gold);
    margin-bottom: 0.5rem;
}

.recommendation-item ul {
    margin-bottom: 0;
    padding-left: 1.2rem;
}

.recommendation-item li {
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

/* History Section */
.history-item {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.history-item:hover {
    box-shadow: var(--shadow-sm);
    transform: translateX(5px);
}

.history-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.history-values {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.history-value {
    font-size: 0.85rem;
    background: rgba(212, 172, 13, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius-sm);
}

/* Offcanvas Styles */
.offcanvas {
    background-color: var(--bg-primary);
    border-left: 3px solid var(--primary-gold);
}

.offcanvas-header {
    background: linear-gradient(135deg, var(--light-cream), var(--warm-tan));
    border-bottom: 1px solid var(--border-color);
}

.offcanvas-title {
    color: var(--text-primary);
    font-weight: 600;
}

.education-content h6 {
    color: var(--primary-gold);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.tips-list .tip-item {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--border-radius-md);
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-blue);
}

.tips-list .tip-item strong {
    color: var(--primary-gold);
}

/* Modal Styles */
.modal-content {
    border: none;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-primary);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-gold), var(--secondary-olive));
    color: white;
    border-bottom: none;
    border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
}

.modal-title {
    font-weight: 600;
}

.modal-body {
    padding: 2rem;
}

.modal-body h6 {
    color: var(--primary-gold);
    font-weight: 600;
    margin-bottom: 0.5rem;
    margin-top: 1rem;
}

.modal-body h6:first-child {
    margin-top: 0;
}

/* FAQ Section */
.accordion-item {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    margin-bottom: 0.5rem;
    overflow: hidden;
}

.accordion-button {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: none;
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background: linear-gradient(135deg, var(--light-cream), var(--warm-tan));
    color: var(--text-primary);
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(212, 172, 13, 0.25);
}

.accordion-body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Ad Placeholders */
.ad-container {
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    text-align: center;
    overflow: hidden;
}

.ad-placeholder {
    padding: 2rem 1rem;
}

.ad-content {
    color: var(--text-secondary);
    font-style: italic;
}

/* Footer */
.footer-section {
    background: linear-gradient(135deg, var(--secondary-olive), var(--primary-gold));
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content h6 {
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.footer-links {
    text-align: right;
}

.footer-links .btn-link {
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.25rem 0.5rem;
}

.footer-links .btn-link:hover {
    color: var(--light-cream);
    text-decoration: underline;
}

/* Dark Mode Toggle */
#darkModeToggle {
    border: 2px solid var(--text-secondary);
    color: var(--text-secondary);
    background: transparent;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

#darkModeToggle:hover {
    background: var(--text-secondary);
    color: white;
    transform: rotate(180deg);
}

/* Dark Mode Styles */
[data-theme="dark"] {
    color-scheme: dark;
}

[data-theme="dark"] .hero-section {
    background: linear-gradient(135deg, rgba(45, 45, 45, 0.9), rgba(141, 135, 65, 0.3));
}

[data-theme="dark"] .stat-card {
    background: rgba(45, 45, 45, 0.9);
    color: var(--text-primary);
}

[data-theme="dark"] .header-section {
    background: linear-gradient(135deg, var(--bg-secondary), var(--secondary-olive));
}

[data-theme="dark"] .calculator-card .card-body {
    background: var(--bg-primary);
}

[data-theme="dark"] .modal-content,
[data-theme="dark"] .offcanvas {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

[data-theme="dark"] .accordion-button {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

[data-theme="dark"] .accordion-body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .hero-section .display-4 {
        font-size: 2rem;
    }
    
    .calculator-card .card-body {
        padding: 1.5rem;
    }
    
    .stat-card {
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .history-values {
        gap: 0.5rem;
    }
    
    .history-value {
        font-size: 0.75rem;
    }
    
    .footer-links {
        text-align: left;
        margin-top: 1rem;
    }
    
    .chart-container {
        height: 250px;
    }
}

@media (max-width: 576px) {
    .hero-section .display-4 {
        font-size: 1.75rem;
    }
    
    .hero-section .lead {
        font-size: 1rem;
    }
    
    .calculator-card .card-header,
    .calculator-card .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .chart-container {
        height: 200px;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-gold);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Tooltip Customization */
.tooltip {
    font-size: 0.8rem;
}

.tooltip-inner {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border-radius: var(--border-radius-sm);
}

/* Print Styles */
@media print {
    .header-section,
    .footer-section,
    .btn,
    .ad-container {
        display: none !important;
    }
    
    .results-section {
        page-break-inside: avoid;
    }
    
    .card {
        border: 1px solid #000 !important;
        box-shadow: none !important;
    }
}

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

/* Focus Styles */
*:focus {
    outline: 2px solid var(--primary-gold);
    outline-offset: 2px;
}

.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: none;
    box-shadow: 0 0 0 0.2rem rgba(212, 172, 13, 0.5);
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-secondary: #ffffff;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}