/* Custom Properties (Theming) */
:root {
    --color-primary: #1e3a8a; /* Deep blue */
    --color-secondary: #0f172a; /* Slate 900 */
    --color-accent: #2563eb; /* Royal blue */
    --color-background: #ffffff;
    --color-bg-light: #f8fafc;
    --color-text: #334155;
    --color-heading: #0f172a;
    --color-border: #e2e8f0;
    --color-link: #2563eb;
    --color-link-hover: #1e40af;
    
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-heading: "Inter", var(--font-primary);
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-link-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Typography Utility */
.text-center { text-align: center; }
.bg-light { background-color: var(--color-bg-light); }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

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

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

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

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

/* Header & Nav */
.site-header {
    background: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.main-nav a {
    color: var(--color-heading);
    font-weight: 500;
}

.main-nav a[aria-current="page"] {
    color: var(--color-accent);
    font-weight: 600;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 20px;
    position: relative;
}

.hamburger, .hamburger::before, .hamburger::after {
    content: '';
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-heading);
    position: absolute;
    transition: 0.3s;
}

.hamburger { top: 50%; transform: translateY(-50%); }
.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-3 {
    grid-template-columns: 1fr;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.article-card {
    padding: 0;
    overflow: hidden;
}

.article-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-card .card-content {
    padding: var(--spacing-sm);
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-light);
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.hero p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.stat-counters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat .number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat .label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text);
}

/* Sections */
section {
    padding: var(--spacing-lg) 0;
}

section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
}

/* CTA Banner */
.cta-banner {
    background: var(--color-secondary);
    color: white;
    text-align: center;
}

.cta-banner h2 {
    color: white;
}

/* Accordion */
.accordion {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    border-bottom: 1px solid var(--color-border);
}

.accordion-header {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: var(--spacing-sm) 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-heading);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.accordion-header::after {
    content: '+';
    font-size: 1.5rem;
}

.accordion-item.active .accordion-header::after {
    content: '-';
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-content p {
    padding-bottom: var(--spacing-sm);
}

/* Page Layout (Blog/Post/Generic) */
.page-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-sm);
}

/* Blog Listing */
.article-card.horizontal {
    display: grid;
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-md);
}

.article-card.horizontal img {
    height: 100%;
    min-height: 200px;
}

.meta {
    font-size: 0.875rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.read-more {
    display: inline-block;
    margin-top: var(--spacing-xs);
    font-weight: 600;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

.pagination a, .pagination span {
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.page-current {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Sidebar */
.widget {
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.widget h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--spacing-xs);
}

.category-list, .related-articles {
    list-style: none;
}

.category-list li, .related-articles li {
    margin-bottom: var(--spacing-xs);
}

.related-articles .date {
    display: block;
    font-size: 0.875rem;
}

.tag-cloud a {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.875rem;
    margin: 0 0.25rem 0.25rem 0;
}

/* Post Styling */
.post-wrapper h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.post-meta {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

.breadcrumb {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.featured-image {
    margin-bottom: var(--spacing-md);
}

.featured-image img {
    width: 100%;
    border-radius: var(--radius-md);
}

.featured-image figcaption {
    font-size: 0.875rem;
    color: var(--color-text);
    text-align: center;
    margin-top: var(--spacing-xs);
}

.toc-container {
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.toc-container ul {
    list-style-type: none;
}

.post-body p, .post-body h2 {
    margin-bottom: var(--spacing-sm);
}

.post-body h2 {
    margin-top: var(--spacing-md);
}

.callout-box {
    background: #eef2ff;
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.pull-quote {
    font-size: 1.5rem;
    font-style: italic;
    color: var(--color-primary);
    text-align: center;
    margin: var(--spacing-lg) 0;
    padding: 0 var(--spacing-lg);
    border: none;
}

.author-bio {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
}

.author-bio img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
}

/* Forms */
.contact-form .form-group {
    margin-bottom: var(--spacing-sm);
}

.contact-form label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.contact-form input, .contact-form select, .contact-form textarea, .subscribe-widget input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
}

/* Footer */
.site-footer {
    background: var(--color-secondary);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: white;
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
}

/* Responsive */
@media (min-width: 768px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .page-layout {
        grid-template-columns: 2fr 1fr;
    }
    
    .article-card.horizontal {
        grid-template-columns: 300px 1fr;
    }
}

@media (max-width: 767px) {
    .mobile-toggle {
        display: block;
    }
    
    .main-nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: var(--shadow-md);
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav a {
        display: block;
        padding: var(--spacing-sm);
        border-bottom: 1px solid var(--color-border);
    }
}