/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', 'Open Sans', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Header Styles */
.header-section {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    color: white !important;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

.navbar-brand i {
    margin-right: 0.5rem;
    color: #ffd700;
}

.navbar-nav .nav-link {
    color: rgba(255,255,255,0.9) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: #ffd700 !important;
    background-color: rgba(255,255,255,0.1);
    border-radius: 4px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 4rem 0;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.2rem;
    color: #6c757d;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,123,255,0.3);
}

.btn-outline-primary {
    border: 2px solid #007bff;
    color: #007bff;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background-color: #007bff;
    color: white;
    transform: translateY(-2px);
}

/* Quick Reference Section */
.quick-reference-section {
    padding: 4rem 0;
    background-color: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    border-radius: 2px;
}

.size-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    margin-bottom: 2rem;
    border: 2px solid transparent;
}

.size-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    border-color: #007bff;
}

.size-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.size-icon i {
    font-size: 1.5rem;
    color: white;
}

.size-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.size-details p {
    margin-bottom: 0.5rem;
    color: #6c757d;
    font-size: 0.95rem;
}

.size-details strong {
    color: #2c3e50;
}

/* Ad Sections */
.ad-section {
    padding: 2rem 0;
    background-color: #f8f9fa;
}

.ad-container {
    background-color: white;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    position: relative;
}

.ad-container::before {
    content: 'Advertisement';
    position: absolute;
    top: 5px;
    left: 5px;
    font-size: 0.7rem;
    color: #6c757d;
    text-transform: uppercase;
}

/* Content Section */
.content-section {
    padding: 4rem 0;
    background-color: white;
}

.main-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.main-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 2rem;
}

.main-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #495057;
    margin: 2rem 0 1rem 0;
}

.main-content h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #495057;
    margin: 1.5rem 0 1rem 0;
}

.info-box {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-left: 4px solid #007bff;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 2rem 0;
}

.info-box h4 {
    color: #1976d2;
    margin-bottom: 1rem;
}

.info-box ul {
    margin-bottom: 1rem;
}

.measurement-table,
.comparison-table {
    margin: 2rem 0;
}

.table {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.table thead th {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    font-weight: 600;
    border: none;
    text-align: center;
}

.table tbody td {
    text-align: center;
    vertical-align: middle;
    font-weight: 500;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0,123,255,0.05);
}

/* Sidebar */
.sidebar {
    padding-left: 2rem;
}

.widget {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    border: 1px solid #e9ecef;
}

.widget h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 1rem;
    border-bottom: 2px solid #007bff;
    padding-bottom: 0.5rem;
}

.converter-widget {
    margin-top: 1rem;
}

.form-label {
    font-weight: 600;
    color: #495057;
}

.form-control,
.form-select {
    border: 2px solid #e9ecef;
    border-radius: 6px;
    padding: 0.75rem;
    transition: all 0.3s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
}

#conversion-result {
    background: #f8f9fa;
    border-radius: 6px;
    padding: 1rem;
    font-weight: 600;
    color: #2c3e50;
    text-align: center;
    display: none;
}

.size-guide-links {
    list-style: none;
    padding: 0;
}

.size-guide-links li {
    margin-bottom: 0.75rem;
}

.size-guide-links a {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: block;
    padding: 0.5rem;
    border-radius: 6px;
}

.size-guide-links a:hover {
    background-color: #f8f9fa;
    color: #0056b3;
    text-decoration: none;
    padding-left: 1rem;
}

/* Footer */
.footer-section {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-section h5,
.footer-section h6 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: #ecf0f1;
}

.footer-section p {
    color: #bdc3c7;
    line-height: 1.6;
}

.social-links {
    margin-top: 1rem;
}

.social-link {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    color: white;
    margin-right: 0.5rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

.social-link:hover {
    background: #007bff;
    color: white;
    transform: translateY(-2px);
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #007bff;
}

.size-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.size-tag {
    background: rgba(0,123,255,0.1);
    color: #007bff;
    padding: 0.3rem 0.7rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(0,123,255,0.2);
}

.footer-section hr {
    border-color: rgba(255,255,255,0.1);
    margin: 2rem 0 1rem;
}

/* 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 #007bff;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Utility Classes */
.text-primary {
    color: #007bff !important;
}

.bg-light-blue {
    background-color: rgba(0,123,255,0.05);
}

.border-primary {
    border-color: #007bff !important;
}

.shadow-sm {
    box-shadow: 0 2px 10px rgba(0,0,0,0.08) !important;
}

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

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

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

/* Print Styles */
@media print {
    .header-section,
    .footer-section,
    .ad-container,
    .sidebar {
        display: none !important;
    }
    
    .main-content {
        width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    h1, h2, h3 {
        page-break-after: avoid;
    }
    
    table {
        page-break-inside: avoid;
    }
}