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

/* --- CSS Variables & Reset --- */
:root {
    --bg-primary: #0d1b2a;
    --bg-secondary: #1b263b;
    --border-color: #415a77;
    --text-primary: #e0e1dd;
    --text-secondary: #a9a9a9;
    --accent-primary: #778da9;
    --accent-hover: #ffffff;
    --font-main: 'Poppins', 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-primary);
    line-height: 1.8;
    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: 1rem;
}

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

/* --- Header & Navigation --- */
.site-header {
    background-color: rgba(27, 38, 59, 0.8);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.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;
    letter-spacing: 1px;
}

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

.main-nav a {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1rem;
    padding: 0.5rem 0;
    position: relative;
}
.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--accent-hover);
    transition: width 0.3s ease;
}
.main-nav a:hover, .main-nav a.active {
    color: var(--accent-hover);
}
.main-nav a:hover::after {
    width: 100%;
}

/* --- Main Layout --- */
.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 3rem 0;
}

@media (min-width: 992px) {
    .main-layout {
        grid-template-columns: 3fr 1fr;
    }
}

.main-content {
    width: 100%;
}

/* --- Article List --- */
.page-title {
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

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

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

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.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-primary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.article-card-title {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
}
.article-card-title a {
    color: var(--text-primary);
}
.article-card-title a:hover {
    color: var(--accent-primary);
}

.article-card-excerpt {
    font-size: 0.95rem;
    line-height: 1.7;
}

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

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

.sidebar-title {
    font-size: 1.25rem;
    padding-bottom: 0.75rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

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

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

.sidebar-widget a {
    color: var(--text-secondary);
    font-weight: 600;
}
.sidebar-widget a:hover {
    color: var(--accent-hover);
}

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

/* --- Single Article Page --- */
.article-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

.article-category {
    color: var(--accent-primary);
    font-size: 1rem;
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 0.75rem;
    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;
}

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

.article-content img {
    max-width: 100%;
    height: auto;
    margin: 2.5rem 0;
    border-radius: 8px;
}

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

/* --- Footer --- */
.site-footer {
    background-color: var(--bg-secondary);
    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: 2.5rem; }

    .header-content {
        flex-direction: column;
        gap: 1.5rem;
    }

    .main-nav ul {
        justify-content: center;
        gap: 1.5rem;
    }
}