:root {
    --reviz-blue: #3B82F6;
    --reviz-green: #10B981;
    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --border-color: #E5E7EB;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.logo a {
    font-family: 'Batangas', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav li a {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav li a:hover {
    color: var(--reviz-blue);
}

.search-bar {
    display: flex;
}

.search-bar input {
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    border-radius: 0.25rem 0 0 0.25rem;
}

.search-bar button {
    background-color: var(--reviz-blue);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0 0.25rem 0.25rem 0;
    cursor: pointer;
}

.article-container {
    display: flex;
    max-width: 1200px;
    margin: 2rem auto;
    gap: 2rem;
}

.article-main {
    flex: 3;
}

.article-sidebar {
    flex: 1;
}

.article-header h1 {
    font-family: 'Source Serif Pro', serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.article-meta {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.article-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
}

.tab-button.active {
    color: var(--reviz-blue);
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--reviz-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.sidebar-section {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 2rem;
}

.sidebar-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--reviz-blue);
}

.footer {
    background-color: var(--bg-secondary);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

.footer-links li {
    display: inline-block;
    margin: 0 1rem;
}

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

.footer-links a:hover {
    color: var(--reviz-blue);
}