/* --- Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

/* --- CSS Variables & Reset --- */
:root {
    --bg-color: #FFFFFF;
    --bg-alt-color: #F8F9FA;
    --border-color: #E9ECEF;
    --text-primary: #212529;
    --text-secondary: #6C757D;
    --accent-color: #007BFF;
    --font-main: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-main);
    color: var(--text-primary);
    background-color: var(--bg-color);
    line-height: 1.6;
    font-size: 16px;
}

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

h1 { font-size: 2.8rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1.2rem; color: var(--text-secondary); }
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* --- Header & Navigation --- */
.site-header {
    background-color: var(--bg-color);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.85);
}

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

.site-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}
.site-title:hover {
    color: var(--text-primary);
    text-decoration: none;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
}
.main-nav a:hover {
    color: var(--accent-color);
    text-decoration: none;
}

/* --- Main Layout --- */
.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
}

@media (min-width: 992px) {
    .main-layout {
        grid-template-columns: 2.5fr 1fr;
    }
}

.main-content {
    width: 100%;
}

/* --- Article List --- */
.page-title {
    margin-bottom: 2rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.article-list {
    display: grid;
    gap: 2rem;
}

.article-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.article-card-image img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

.article-card-content {
    padding: 1.5rem;
}

.article-card-category {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
}

.article-card-title {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
}
.article-card-title a {
    color: var(--text-primary);
    text-decoration: none;
}
.article-card-title a:hover {
    color: var(--accent-color);
}

.article-card-excerpt {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* --- Sidebar --- */
.sidebar {
    padding: 1.5rem;
    background-color: var(--bg-alt-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    align-self: start;
}

.sidebar-widget {
    margin-bottom: 2.5rem;
}
.sidebar-widget:last-child {
    margin-bottom: 0;
}

.sidebar-title {
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.sidebar-widget ul {
    list-style: none;
}

.sidebar-widget li {
    margin-bottom: 0.75rem;
}

.sidebar-widget a {
    color: var(--text-secondary);
    font-weight: 400;
}
.sidebar-widget a:hover {
    color: var(--accent-color);
    text-decoration: none;
}

.promo-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    border-left: 3px solid var(--accent-color);
    padding-left: 1rem;
}

/* --- Single Article Page --- */
.article-header {
    margin-bottom: 2rem;
    text-align: center;
}

.article-category {
    color: var(--accent-color);
    font-size: 1rem;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.article-title {
    font-size: 3rem;
    line-height: 1.2;
}

.article-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

.article-content {
    font-size: 1.1rem;
    max-width: 750px;
    margin: 0 auto;
    color: var(--text-primary);
}

.article-content p {
    color: var(--text-primary);
}

.article-content img {
    max-width: 100%;
    height: auto;
    margin: 2rem 0;
    border-radius: 8px;
}

.article-content h2, .article-content h3 {
    margin-top: 2.5rem;
}

/* --- Footer --- */
.site-footer {
    background-color: var(--bg-alt-color);
    color: var(--text-secondary);
    padding: 2.5rem 0;
    margin-top: 3rem;
    text-align: center;
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    .article-title { font-size: 2.4rem; }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav ul {
        justify-content: center;
        gap: 1rem;
    }
}