/* 
 * Blog Theme CSS - Professional & User-Friendly Design
 * Optimized for SEO and Modern Aesthetics
 */

:root {
    /* Color Palette */
    --primary-color: #007bff;
    --primary-dark: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
    --gradient-warning: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    
    /* Spacing */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 1rem;
    --line-height-base: 1.6;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    --transition-slow: all 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: #2d3748;
    background-color: #f7fafc;
    overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
    border: 2px solid #f1f5f9;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Selection Colors */
::selection {
    background: var(--primary-color);
    color: white;
}

::-moz-selection {
    background: var(--primary-color);
    color: white;
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: #4a5568;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
}

a:hover {
    color: var(--primary-dark);
}

/* Button Styles */
.btn {
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    text-transform: none;
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-gradient {
    background: var(--gradient-primary);
    color: white;
    border: none;
}

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

.btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

/* Card Styles */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition-base);
    overflow: hidden;
}

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

/* Form Styles */
.form-control {
    border-radius: var(--border-radius);
    border: 2px solid #e2e8f0;
    padding: 0.75rem 1rem;
    transition: var(--transition-base);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.fade-in.show {
    opacity: 1;
    transform: translateY(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.8);
    transition: var(--transition-base);
}

.scale-in.show {
    opacity: 1;
    transform: scale(1);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: var(--transition-base);
}

.slide-in-left.show {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: var(--transition-base);
}

.slide-in-right.show {
    opacity: 1;
    transform: translateX(0);
}

/* Utility Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-secondary {
    background: var(--gradient-secondary);
}

.bg-gradient-success {
    background: var(--gradient-success);
}

.shadow-soft {
    box-shadow: var(--shadow);
}

.shadow-strong {
    box-shadow: var(--shadow-lg);
}

.rounded-soft {
    border-radius: var(--border-radius);
}

.rounded-strong {
    border-radius: var(--border-radius-lg);
}

/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--border-radius-sm);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-text:last-child {
    width: 80%;
}

.skeleton-title {
    height: 1.5rem;
    width: 60%;
    margin-bottom: 1rem;
}

.skeleton-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    max-width: 400px;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 600;
    transform: translateX(100%);
    transition: var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    background: var(--gradient-success);
}

.notification.error {
    background: var(--gradient-warning);
}

.notification.info {
    background: var(--gradient-primary);
}

/* Pagination Improvements */
.pagination {
    gap: 0.5rem;
}

.page-link {
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    color: var(--primary-color);
    background: white;
    transition: var(--transition-base);
    margin: 0;
}

.page-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.page-item.active .page-link {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

/* Badge Improvements */
.badge {
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

/* Alert Improvements */
.alert {
    border: none;
    border-radius: var(--border-radius);
    border-left: 4px solid;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
}

.alert-primary {
    background: rgba(0, 123, 255, 0.1);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.alert-success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
    border-left-color: var(--success-color);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
    border-left-color: var(--warning-color);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
    border-left-color: var(--danger-color);
}

/* Dark Mode Styles */
.dark-mode {
    background-color: #1a202c;
    color: #e2e8f0;
}

.dark-mode h1,
.dark-mode h2,
.dark-mode h3,
.dark-mode h4,
.dark-mode h5,
.dark-mode h6 {
    color: #f7fafc;
}

.dark-mode p {
    color: #cbd5e0;
}

.dark-mode .card {
    background-color: #2d3748;
    color: #e2e8f0;
}

.dark-mode .form-control {
    background-color: #2d3748;
    border-color: #4a5568;
    color: #e2e8f0;
}

.dark-mode .form-control:focus {
    background-color: #2d3748;
    border-color: var(--primary-color);
    color: #e2e8f0;
}

/* Performance Optimizations */
.will-change-transform {
    will-change: transform;
}

.will-change-opacity {
    will-change: opacity;
}

.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Focus Styles for Accessibility */
.focus-visible,
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    .blog-widget,
    .share-buttons,
    .navigation-posts,
    .sidebar {
        display: none !important;
    }
    
    .article-content {
        font-size: 12pt;
        line-height: 1.5;
        color: black;
    }
    
    .article-content h1,
    .article-content h2,
    .article-content h3 {
        page-break-after: avoid;
    }
    
    .article-content img {
        max-width: 100%;
        page-break-inside: avoid;
    }
}

/* Responsive Design Enhancements */
@media (max-width: 768px) {
    :root {
        --border-radius: 8px;
        --border-radius-lg: 12px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .btn {
        padding: 0.6rem 1.2rem;
    }
    
    .notification {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
}

@media (max-width: 576px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* High DPI/Retina Display Optimizations */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .shadow-soft {
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    }
    
    .shadow-strong {
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    }
}

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

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .btn {
        border: 2px solid currentColor;
    }
    
    .card {
        border: 1px solid currentColor;
    }
    
    .form-control {
        border-width: 2px;
    }
}