:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --bg-color: #f8fafc;
    --bg-dark: #1e293b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --code-bg: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-top: 2rem; }
h3 { font-size: 1.5rem; margin-top: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

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

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

code {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: #e11d48;
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

pre code {
    background: none;
    padding: 0;
    color: var(--text-color);
}

/* Header */
.site-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.5rem;
    color: white !important;
    transition: var(--transition);
}

.navbar-brand:hover {
    transform: translateY(-2px);
    color: white !important;
}

.navbar-brand i {
    font-size: 2rem;
    color: var(--accent-color);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-name {
    font-size: 1.5rem;
}

.brand-tagline {
    font-size: 0.75rem;
    font-weight: 400;
    opacity: 0.9;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    margin: 0 0.25rem;
    border-radius: 8px;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    background: rgba(255, 255, 255, 0.15);
    color: white !important;
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 400px);
    padding: 3rem 0;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

/* Content Cards */
.content-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.content-card img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
    box-shadow: var(--shadow);
}

/* Article Cards */
.article-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    align-items: start;
}

.article-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(8px);
    border-color: var(--primary-color);
}

.article-card i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 1rem;
    margin-top: 0.2rem;
}

.article-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    margin-top: 0;
}

.article-card p {
    color: var(--text-light);
    margin-bottom: 0;
}

.article-card a {
    text-decoration: none;
    color: inherit;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 100px;
}

.sidebar-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.sidebar-heading {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
}

.sidebar-heading i {
    color: var(--primary-color);
}

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

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

.sidebar-links li:last-child {
    margin-bottom: 0;
}

.sidebar-links a {
    color: var(--text-light);
    font-size: 0.95rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    padding: 0.5rem;
    border-radius: 6px;
}

.sidebar-links a:hover {
    color: var(--primary-color);
    background: var(--bg-color);
    transform: translateX(4px);
}

.sidebar-links a::before {
    content: '▸';
    margin-right: 0.5rem;
    color: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

.sidebar-links a:hover::before {
    opacity: 1;
}

.info-box {
    background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 100%);
}

.info-box .table {
    margin-bottom: 0;
    font-size: 0.9rem;
}

.info-box .table th {
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
}

.info-box .table td {
    color: var(--text-light);
}

/* Lists */
ul, ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

.content-card ul li,
.content-card ol li {
    color: var(--text-color);
}

/* Ad Spaces */
.ad-space {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    border: 1px dashed var(--border-color);
}

.ad-banner-top,
.ad-banner-bottom {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 1rem;
    margin: 2rem 0;
    text-align: center;
    border: 1px dashed var(--border-color);
}

/* FAQ Styles */
.faq-item {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-top: 0;
}

/* Footer */
.site-footer {
    background: linear-gradient(135deg, var(--bg-dark) 0%, #0f172a 100%);
    color: rgba(255, 255, 255, 0.8);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-heading {
    color: white;
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-heading i {
    color: var(--accent-color);
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: white;
    transform: translateX(4px);
}

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

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin: 0;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

/* Responsive */
@media (max-width: 991px) {
    .sidebar {
        position: static;
        margin-top: 2rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
}

@media (max-width: 767px) {
    .brand-name {
        font-size: 1.2rem;
    }
    
    .brand-tagline {
        font-size: 0.65rem;
    }
    
    .main-content {
        padding: 2rem 0;
    }
    
    .content-card {
        padding: 1.5rem;
    }
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.badge-custom {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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