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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #1e293b;
    background-color: #f0f4f8;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-header {
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: #2563eb;
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-link {
    text-decoration: none;
    color: #475569;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #2563eb;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.main-container {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

@media (min-width: 768px) {
    .main-container {
        flex-direction: row;
    }
}

.main-content {
    flex: 1;
}

.sidebar {
    width: 100%;
}

@media (min-width: 768px) {
    .sidebar {
        width: 300px;
    }
}

.article-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 640px) {
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .article-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.article-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.12);
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.card-content {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.card-excerpt {
    color: #64748b;
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.card-link {
    color: #2563eb;
    font-weight: 600;
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.2s ease;
}

.card-link:hover {
    gap: 0.75rem;
}

.sidebar-widget {
    background: #ffffff;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.widget-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #2563eb;
}

.footer {
    background-color: #1e293b;
    color: #cbd5e1;
    padding: 3rem 0;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    text-align: center;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
}

.footer-nav .nav-list {
    gap: 1.5rem;
}

.footer-nav .nav-link {
    color: #94a3b8;
    font-weight: 500;
}

.footer-nav .nav-link:hover {
    color: #ffffff;
}

.copyright {
    font-size: 0.875rem;
    color: #94a3b8;
}

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: #1e293b;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
}

p {
    margin-bottom: 1.5rem;
}

@media (max-width: 767px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }
    .nav-list {
        gap: 1.5rem;
    }
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.75rem;
    }
}