:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --border-color: #30363d;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.site-header {
    border-bottom: 1px solid var(--border-color);
    padding: 18px 0;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 10;
}

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

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.brand span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

main {
    flex: 1;
    padding: 48px 24px;
}

.hero {
    margin-bottom: 48px;
}

.hero-tag {
    display: inline-block;
    background: rgba(88, 166, 255, 0.1);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
    border: 1px solid rgba(88, 166, 255, 0.2);
}

h1 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.8px;
    margin-bottom: 16px;
}

.subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 680px;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.post-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.post-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.post-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-card h2 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    line-height: 1.35;
}

.post-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex: 1;
    margin-bottom: 20px;
}

.read-more {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.read-more:hover {
    text-decoration: underline;
}

.content-page {
    max-width: 720px;
}

.content-page h2 {
    margin-top: 32px;
    margin-bottom: 16px;
    font-size: 1.5rem;
}

.content-page p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.content-page ul {
    margin-left: 20px;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.content-page li {
    margin-bottom: 8px;
}

.lead {
    font-size: 1.15rem;
    color: var(--text-primary) !important;
}

.btn-link {
    display: inline-block;
    margin-top: 24px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.btn-link:hover {
    text-decoration: underline;
}

.text-center {
    text-align: center;
}

.site-footer {
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: auto;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

@media (max-width: 640px) {
    h1 {
        font-size: 1.75rem;
    }
    .footer-container {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}