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

:root {
    --font-serif: 'Merriweather', Georgia, serif;
    --font-sans: 'Open Sans', -apple-system, sans-serif;
    --color-primary: #1a365d;
    --color-dark: #2d3748;
    --color-gray: #4a5568;
    --color-light: #718096;
    --color-border: #e2e8f0;
    --color-bg: #fff;
    --color-bg-alt: #f7fafc;
    --color-accent: #2b6cb0;
}

body {
    font-family: var(--font-sans);
    color: var(--color-dark);
    background: var(--color-bg);
    line-height: 1.7;
    font-size: 16px;
}

a {
    color: inherit;
    text-decoration: none;
}

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

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    background: var(--color-bg);
}

.header-top {
    background: var(--color-primary);
    color: #fff;
    padding: 10px 0;
    font-size: 13px;
}

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

.top-nav a {
    color: rgba(255,255,255,0.8);
    margin-left: 20px;
    font-size: 13px;
}

.top-nav a:hover {
    color: #fff;
}

.header-main {
    padding: 35px 0;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-family: var(--font-serif);
    font-size: 38px;
    font-weight: 900;
    color: var(--color-primary);
}

.tagline {
    margin-top: 8px;
    font-size: 14px;
    color: var(--color-light);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.main-nav {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.nav-menu {
    display: flex;
    justify-content: center;
    list-style: none;
}

.nav-menu li a {
    display: block;
    padding: 16px 28px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gray);
    transition: all 0.2s;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: var(--color-accent);
    background: var(--color-bg);
}

/* Main */
.site-main {
    padding: 40px 0;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* Hero Article */
.hero-article {
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.hero-article .hero-content {
    max-width: 800px;
    cursor: pointer;
}

.hero-article .post-category {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.hero-article .post-title {
    font-family: var(--font-serif);
    font-size: 34px;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.hero-article .post-title:hover {
    color: var(--color-accent);
}

.hero-article .post-excerpt {
    font-size: 18px;
    color: var(--color-gray);
    line-height: 1.7;
    margin-bottom: 16px;
}

.hero-article .post-meta {
    font-size: 14px;
    color: var(--color-light);
}

.hero-article .author {
    color: var(--color-dark);
    font-weight: 600;
}

/* Content Layout */
.content-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 50px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 25px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--color-primary);
}

/* Articles Feed */
.articles-feed .article-item {
    padding: 25px 0;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
}

.articles-feed .post-category {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.articles-feed .post-title {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.articles-feed .post-title:hover {
    color: var(--color-accent);
}

.articles-feed .post-excerpt {
    font-size: 15px;
    color: var(--color-gray);
    line-height: 1.6;
    margin-bottom: 10px;
}

.articles-feed .post-meta {
    font-size: 13px;
    color: var(--color-light);
}

/* Sidebar */
.sidebar-section {
    background: var(--color-bg-alt);
    padding: 25px;
    border-radius: 4px;
}

.sidebar-title {
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-primary);
}

.sidebar-post {
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
}

.sidebar-post:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.sidebar-post .post-title {
    font-family: var(--font-serif);
    font-size: 15px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-dark);
    margin-bottom: 6px;
}

.sidebar-post .post-title:hover {
    color: var(--color-accent);
}

.sidebar-post .post-meta {
    font-size: 12px;
    color: var(--color-light);
}

/* Category Page */
.category-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 3px solid var(--color-primary);
}

.category-header h1 {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary);
}

.category-header p {
    margin-top: 8px;
    color: var(--color-light);
}

/* Single Article */
.single-article {
    max-width: 720px;
    margin: 0 auto;
}

.single-article .back-link {
    display: inline-block;
    font-size: 14px;
    color: var(--color-light);
    margin-bottom: 25px;
}

.single-article .back-link:hover {
    color: var(--color-accent);
}

.single-article .post-category {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.single-article h1 {
    font-family: var(--font-serif);
    font-size: 38px;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.single-article .article-meta {
    font-size: 15px;
    color: var(--color-light);
    padding-bottom: 25px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--color-border);
}

.single-article .author {
    color: var(--color-dark);
    font-weight: 600;
}

.single-article .article-content {
    font-size: 18px;
    line-height: 1.85;
    color: var(--color-dark);
}

.single-article .article-content p {
    margin-bottom: 1.6em;
}

/* Footer */
.site-footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.8);
    padding: 50px 0 25px;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 35px;
    border-bottom: 1px solid rgba(255,255,255,0.15);
}

.footer-logo {
    font-family: var(--font-serif);
    font-size: 26px;
    font-weight: 700;
    color: #fff;
    display: block;
    margin-bottom: 15px;
}

.footer-about p {
    font-size: 14px;
    line-height: 1.7;
}

.footer-nav h4 {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 18px;
}

.footer-nav ul {
    list-style: none;
}

.footer-nav li {
    margin-bottom: 10px;
}

.footer-nav a {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
}

.footer-nav a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: 20px;
    font-size: 13px;
    color: rgba(255,255,255,0.5);
}

/* Empty */
.empty-state {
    text-align: center;
    padding: 50px;
    color: var(--color-light);
}

/* Responsive */
@media (max-width: 900px) {
    .content-layout {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 600px) {
    .logo {
        font-size: 28px;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: flex-start;
    }
    
    .nav-menu li a {
        padding: 12px 16px;
    }
    
    .hero-article .post-title {
        font-size: 26px;
    }
    
    .single-article h1 {
        font-size: 28px;
    }
}