/* ===== MODERN THEME CSS - Tailwind Inspired ===== */

/* CSS Variables for consistent theming */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Category Colors */
    --category-blue: #3b82f6;
    --category-green: #10b981;
    --category-purple: #8b5cf6;
    --category-orange: #f59e0b;
    --category-red: #ef4444;
    --category-teal: #14b8a6;
    --category-indigo: #6366f1;
    --category-pink: #ec4899;
    --category-yellow: #eab308;
    --category-cyan: #06b6d4;
    --category-lime: #84cc16;
    --category-rose: #f43f5e;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* ===== BASE STYLES ===== */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--gray-50);
    margin: 0;
    padding: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

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: 1.125rem; }

p {
    color: var(--gray-600);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
}

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

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

/* ===== NAVBAR STYLES ===== */

.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-md) 0;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--gray-900);
}

.navbar-brand:hover {
    color: var(--primary-color);
}

.nav-link {
    color: var(--gray-600) !important;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md) !important;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    margin: 0 var(--spacing-xs);
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background-color: var(--gray-100);
    text-decoration: none !important;
}

.navbar-toggler {
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.navbar-toggler:hover {
    background-color: var(--gray-100);
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===== MAIN CONTENT ===== */

.main-content {
    min-height: calc(100vh - 200px);
    padding: var(--spacing-2xl) 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== CATEGORY TILES STYLES ===== */

.categories-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.category-tile {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.category-tile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--category-blue), var(--category-purple));
    transition: all var(--transition-normal);
}

.category-tile:nth-child(1)::before { background: linear-gradient(90deg, var(--category-blue), var(--category-cyan)); }
.category-tile:nth-child(2)::before { background: linear-gradient(90deg, var(--category-green), var(--category-teal)); }
.category-tile:nth-child(3)::before { background: linear-gradient(90deg, var(--category-purple), var(--category-indigo)); }
.category-tile:nth-child(4)::before { background: linear-gradient(90deg, var(--category-orange), var(--category-yellow)); }
.category-tile:nth-child(5)::before { background: linear-gradient(90deg, var(--category-red), var(--category-rose)); }
.category-tile:nth-child(6)::before { background: linear-gradient(90deg, var(--category-teal), var(--category-cyan)); }
.category-tile:nth-child(7)::before { background: linear-gradient(90deg, var(--category-indigo), var(--category-purple)); }
.category-tile:nth-child(8)::before { background: linear-gradient(90deg, var(--category-pink), var(--category-rose)); }
.category-tile:nth-child(9)::before { background: linear-gradient(90deg, var(--category-yellow), var(--category-orange)); }
.category-tile:nth-child(10)::before { background: linear-gradient(90deg, var(--category-cyan), var(--category-blue)); }
.category-tile:nth-child(11)::before { background: linear-gradient(90deg, var(--category-lime), var(--category-green)); }
.category-tile:nth-child(12)::before { background: linear-gradient(90deg, var(--category-rose), var(--category-pink)); }

.category-tile:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--gray-300);
}

.category-tile:hover::before {
    height: 6px;
}

.category-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-normal);
    position: relative;
}

.category-tile:hover .category-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    transform: scale(1.1);
}

.category-icon svg,
.category-icon img {
    width: 24px;
    height: 24px;
    color: var(--gray-600);
    transition: all var(--transition-normal);
}

.category-tile:hover .category-icon svg,
.category-tile:hover .category-icon img {
    color: var(--white);
}

.category-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.category-description {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.5;
    margin: 0;
}

.category-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-100);
}

.category-count {
    font-size: 0.75rem;
    color: var(--gray-500);
    font-weight: 500;
}

.category-arrow {
    width: 16px;
    height: 16px;
    color: var(--gray-400);
    transition: all var(--transition-fast);
}

.category-tile:hover .category-arrow {
    color: var(--primary-color);
    transform: translateX(4px);
}

/* ===== CARD STYLES ===== */

.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    overflow: hidden;
}

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

.card-body {
    padding: var(--spacing-lg);
}

.card-title {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== BUTTON STYLES ===== */

.btn {
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background-color: var(--gray-200);
    color: var(--gray-800);
}

/* ===== IMAGE STYLES ===== */

.img-fluid {
    border-radius: var(--radius-md);
    transition: transform var(--transition-normal);
}

.img-fluid:hover {
    transform: scale(1.02);
}

.no-affect-img {
    width: auto !important;
    height: auto !important;
    padding-left: 0 !important;
}

/* ===== ARTICLE STYLES ===== */

article {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-2xl);
}

article h1 {
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
}

article img {
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
}

/* ===== BREADCRUMB STYLES ===== */

.breadcrumb {
    background: transparent;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

.breadcrumb-item a {
    color: var(--gray-500);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--gray-700);
    font-weight: 500;
}

/* ===== UTILITY CLASSES ===== */

.text-muted {
    color: var(--gray-500) !important;
}

.bg-light {
    background-color: var(--gray-50) !important;
}

.border {
    border: 1px solid var(--gray-200) !important;
}

.rounded {
    border-radius: var(--radius-md) !important;
}

.shadow {
    box-shadow: var(--shadow-md) !important;
}

/* ===== RESPONSIVE DESIGN ===== */

@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-lg) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .category-tile {
        padding: var(--spacing-lg);
    }
    
    article {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .card-body {
        padding: var(--spacing-md);
    }
}

@media (max-width: 576px) {
    .main-content {
        padding: var(--spacing-md) 0;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .category-tile {
        padding: var(--spacing-md);
    }
    
    article {
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .card-body {
        padding: var(--spacing-sm);
    }
}

/* ===== ANIMATIONS ===== */

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

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.category-tile {
    animation: slideInUp 0.6s ease-out;
}

.category-tile:nth-child(1) { animation-delay: 0.1s; }
.category-tile:nth-child(2) { animation-delay: 0.2s; }
.category-tile:nth-child(3) { animation-delay: 0.3s; }
.category-tile:nth-child(4) { animation-delay: 0.4s; }
.category-tile:nth-child(5) { animation-delay: 0.5s; }
.category-tile:nth-child(6) { animation-delay: 0.6s; }
.category-tile:nth-child(7) { animation-delay: 0.7s; }
.category-tile:nth-child(8) { animation-delay: 0.8s; }
.category-tile:nth-child(9) { animation-delay: 0.9s; }
.category-tile:nth-child(10) { animation-delay: 1.0s; }
.category-tile:nth-child(11) { animation-delay: 1.1s; }
.category-tile:nth-child(12) { animation-delay: 1.2s; }

/* ===== ACCESSIBILITY ===== */

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

/* Focus styles for accessibility */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.category-tile:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    transform: translateY(-4px);
}