/* ================================
   Simply Nerdy - Layout Styles
   Grid Systems & Page Layouts
   ================================ */

/* ================================
   Header & Navigation
   ================================ */

.site-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    display: flex;
    align-items: center;
    transition: opacity var(--transition-fast);
}

.nav-brand a:hover {
    opacity: 0.8;
}

.nav-brand .logo {
    height: 28px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-links a {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    color: var(--neutral-800);
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links .btn-subscribe {
    color: #F2F2F2;
}

.nav-links .btn-subscribe:hover {
    color: #F2F2F2;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--neutral-900);
    transition: all var(--transition-fast);
}

/* ================================
   Hero Section
   ================================ */

.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero h1 {
    font-size: var(--text-5xl);
    color: white;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.95);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* ================================
   Grid Layouts
   ================================ */

.video-grid,
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

/* ================================
   About Page Layouts
   ================================ */

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.about-main h2,
.about-main h3 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.about-main h2:first-child {
    margin-top: 0;
}

.about-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

/* ================================
   Blog Post Page Layout
   ================================ */

.blog-post-page {
    padding: var(--spacing-3xl) 0;
}

.post-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-2xl);
}

.post-main {
    min-width: 0;
}

.post-header {
    margin-bottom: var(--spacing-2xl);
}

.post-meta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.post-category {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-date {
    font-size: var(--text-sm);
    color: var(--neutral-600);
}

.post-header h1 {
    font-size: var(--text-4xl);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.post-excerpt {
    font-size: var(--text-lg);
    color: var(--neutral-700);
    line-height: 1.6;
}

.post-image {
    margin-bottom: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.post-image img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.post-content {
    font-size: var(--text-lg);
    line-height: 1.8;
    color: var(--neutral-800);
}

.post-content h2,
.post-content h3,
.post-content h4 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.post-content p {
    margin-bottom: var(--spacing-lg);
}

.post-content ul,
.post-content ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.post-content ul {
    list-style: disc;
}

.post-content ol {
    list-style: decimal;
}

.post-content li {
    margin-bottom: var(--spacing-sm);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-2xl) 0;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--border);
}

.post-navigation {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--border);
}

.post-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

/* ================================
   Blog Filters
   ================================ */

.blog-filters {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border);
}

.filter-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.no-posts {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--neutral-600);
}

/* ================================
   Footer
   ================================ */

.site-footer {
    background-color: var(--neutral-900);
    color: var(--accent);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: var(--neutral-400);
}

.footer-links h4,
.footer-social h4 {
    color: white;
    font-size: var(--text-base);
    margin-bottom: var(--spacing-md);
}

.footer-links ul,
.footer-social ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a,
.footer-social a {
    color: var(--neutral-400);
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-social a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--neutral-700);
    text-align: center;
}

.footer-bottom p {
    color: var(--neutral-400);
    font-size: var(--text-sm);
}