/* Theme Variables */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #f8fafc;
    --card-bg-rgb: 255, 255, 255;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --card-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --card-shadow-hover: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --border-radius: 0.75rem;
    --border-radius-sm: 0.5rem;
    --link-color: #2563eb;
    --hover-bg: rgba(37, 99, 235, 0.05);
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --wiki-accent: #059669;
    --knowledge-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

[data-bs-theme="dark"] {
    --background-color: #0f172a;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --card-bg-rgb: 30, 41, 59;
    --card-bg: #1e293b;
    --border-color: #334155;
    --card-border: #334155;
    --hover-bg: rgba(37, 99, 235, 0.1);
    --card-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    --card-shadow-hover: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --link-color: #60a5fa;
    --gradient-bg: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    --knowledge-gradient: linear-gradient(135deg, #059669 0%, #047857 100%);
}

/* General Styles */
body {
    background: var(--background-color);
    color: var(--text-color);
    line-height: 1.7;
    transition: all 0.3s ease;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Enhanced Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-color);
}

.display-title {
    background: var(--knowledge-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
    font-size: 2.5rem;
}

/* Modern Card Design */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--primary-color);
}

.card-header {
    background: var(--gradient-bg);
    color: white;
    border: none;
    padding: 1.25rem 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: var(--background-color);
    border-top: 1px solid var(--card-border);
    padding: 1rem 1.5rem;
}

/* Enhanced Article Cards */
.article-card {
    position: relative;
    margin-bottom: 2rem;
}

.article-card .card {
    border: none;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.article-card .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--knowledge-gradient);
}

.article-thumbnail {
    border-radius: var(--border-radius-sm);
    transition: transform 0.3s ease;
    max-height: 220px;
    object-fit: cover;
    width: 100%;
}

.article-thumbnail:hover {
    transform: scale(1.05);
}

/* Enhanced Form Styles */
.form-control, .form-select {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.875rem 1rem;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    outline: none;
}

/* Modern Button Design */
.btn {
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--knowledge-gradient);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.35);
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
}

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

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

/* Enhanced Navbar */
.navbar {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: var(--card-shadow);
}

[data-bs-theme="dark"] .navbar {
    background: rgba(30, 41, 59, 0.95) !important;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    background: var(--knowledge-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

.nav-link:hover {
    background: var(--hover-bg);
    color: var(--primary-color) !important;
}

/* Theme Toggle Enhancement */
#themeToggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

#themeToggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: rotate(180deg);
}

/* Knowledge Categories */
.category-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    background: var(--card-bg);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: var(--knowledge-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category-card:hover::before {
    opacity: 0.1;
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.category-icon {
    font-size: 2.5rem;
    color: var(--wiki-accent);
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.category-card:hover .category-icon {
    transform: scale(1.1);
    color: var(--primary-color);
}

/* Enhanced Search & Filters */
.search-container {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--card-shadow);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

/* Loading States */
.loading-spinner {
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

.card {
    animation: fadeInUp 0.6s ease-out;
}

/* Wiki-specific enhancements */
.wiki-badge {
    background: var(--knowledge-gradient);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.knowledge-indicator {
    width: 8px;
    height: 8px;
    background: var(--wiki-accent);
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Enhanced Mobile Experience */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .article-card {
        margin-bottom: 1.5rem;
    }

    .card-body {
        padding: 1.25rem;
    }

    .display-title {
        font-size: 2rem;
    }

    .navbar {
        padding: 0.75rem 0;
    }

    .btn {
        width: 100%;
        margin-bottom: 0.75rem;
    }

    .btn-group .btn {
        border-radius: var(--border-radius-sm);
        margin: 0.25rem;
    }
}

/* Article content enhancements */
.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.article-content h1,
.article-content h2,
.article-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-content p {
    margin-bottom: 1.5rem;
}

/* Social sharing enhancements */
.social-share .btn {
    border-radius: 50px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    margin: 0.25rem;
}

/* Bookmark button enhancement */
.bookmark-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    transition: all 0.2s ease;
}

.bookmark-btn:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

.bookmark-btn.bookmarked {
    color: var(--accent-color);
}

/* Advertisement styling */
.advertisement-card {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    margin: 2rem 0;
    transition: all 0.3s ease;
}

[data-bs-theme="dark"] .advertisement-card {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.advertisement-card:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--wiki-accent) 100%);
    color: white;
}

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

.bg-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

[data-bs-theme="dark"] .bg-glass {
    background: rgba(30, 41, 59, 0.1);
    border: 1px solid rgba(30, 41, 59, 0.2);
}