:root {
    --primary: #0ea5e9;
    --text: #1f2937;
    --bg: #f8fafc;
    --card-bg: white;
    --border: #e5e7eb;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.85rem;
    font-weight: 600;
}

.logo span { color: var(--primary); }

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
}

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

.search-bar input {
    padding: 0.7rem 1.1rem;
    border: 1px solid var(--border);
    border-radius: 9999px;
    width: 260px;
    font-size: 1rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #0ea5e9, #1e40af);
    color: white;
    padding: 7rem 0;
    text-align: center;
}

.hero h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Posts */
.posts-section { padding: 4rem 0; }

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.post-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    transition: transform 0.3s;
}

.post-card:hover { transform: translateY(-8px); }

.post-content { padding: 1.75rem; }

.category-pill {
    background: #e0f2fe;
    color: #0369a1;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.post-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.35rem;
    line-height: 1.3;
    margin: 0.75rem 0;
}

.post-title a { color: inherit; text-decoration: none; }
.post-title a:hover { color: var(--primary); }

/* Categories */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    border: 1px solid var(--border);
    transition: all 0.3s;
}

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

/* Dark Mode */
.dark {
    --text: #e2e8f0;
    --bg: #0f172a;
    --card-bg: #1e2937;
    --border: #334155;
}

.dark .hero { background: linear-gradient(135deg, #0284c8, #1e3a8a); }
.dark .category-pill { background: #1e40af; color: #bae6fd; }

/* Footer */
footer {
    background: #1e2937;
    color: #cbd5e1;
    padding: 3rem 0;
    text-align: center;
    margin-top: 4rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--card-bg);
        flex-direction: column;
        align-items: center;
        padding: 3rem 0;
        transition: left 0.3s;
    }
    .nav-links.active { left: 0; }
    .mobile-menu-btn { display: block; }
    .search-bar input { width: 100%; }
    .hero h2 { font-size: 2.4rem; }
    .posts-grid { grid-template-columns: 1fr; }
}