/* --- Global Styles & Variables --- */
:root {
    --primary-font: 'Inter', sans-serif;
    --background-color: #f9fafb;
    --text-color: #374151;
    --header-color: #111827;
    --accent-color: #2563eb;
    --accent-color-hover: #1d4ed8;
    --card-bg-color: #ffffff;
    --border-color: #e5e7eb;
    --footer-bg-color: #1f2937;
    --footer-text-color: #d1d5db;
}

/* --- Base & Reset --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 0;
}

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

/* --- Header & Navigation --- */
.site-header {
    background-color: var(--card-bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.site-header .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

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

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

.main-nav a {
    font-weight: 500;
    color: var(--text-color);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

@media (min-width: 768px) {
    .site-header .container {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* --- Main Content & Articles --- */
.page-header {
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

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

@media (min-width: 768px) {
    .article-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

.article-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.3s ease;
}

.article-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.article-card h3 {
    margin-top: 0;
}

.article-card .read-more {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 600;
}

/* --- Single Article Page --- */
.article-full {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
}

.article-meta {
    color: #6b7280;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.article-meta span {
    margin-right: 1rem;
}

.article-content h2, .article-content h3 {
    margin-top: 2rem;
}

.cta-box {
    background-color: #eef2ff;
    border: 1px solid #c7d2fe;
    color: #4338ca;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
    text-align: center;
}

.cta-box p {
    margin: 0;
}

/* --- Sidebar --- */
.sidebar-widget {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.sidebar-widget h3 {
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

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

.sidebar-widget ul li {
    margin-bottom: 0.5rem;
}

.promo-text {
    background-color: #ecfdf5;
    color: #065f46;
    padding: 1rem;
    border-radius: 8px;
    font-weight: 500;
}

/* --- Footer --- */
.site-footer {
    background-color: var(--footer-bg-color);
    color: var(--footer-text-color);
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

/* --- Generic Page Content --- */
.content-page {
     background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    min-height: 400px;
}