:root {
    --primary-color: #005A9C; /* Professional Blue */
    --secondary-color: #00233D; /* Dark Blue */
    --accent-color: #4CAF50; /* Green for CTAs */
    --text-color: #333333;
    --light-grey: #f4f4f4;
    --white: #ffffff;
    --border-color: #dddddd;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Lato', sans-serif;
    --container-width: 1100px;
    --shadow: 0 4px 8px rgba(0,0,0,0.1);
    --border-radius: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--light-grey);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.75rem;
    color: var(--secondary-color);
}

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

p {
    margin-bottom: 1rem;
}

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

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

ul, ol {
    list-style-position: inside;
    margin-bottom: 1rem;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Header & Navigation --- */
.site-header {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 1.5rem 0;
    text-align: center;
}

.site-header h1 {
    color: var(--white);
    font-size: 2.2rem;
    margin: 0;
}

.main-nav {
    background-color: var(--primary-color);
    padding: 0.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
}

.main-nav ul li a {
    color: var(--white);
    padding: 0.8rem 1.2rem;
    display: block;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
    border-radius: 4px;
}

.main-nav ul li a:hover,
.main-nav ul li a.active {
    background-color: var(--secondary-color);
    text-decoration: none;
}

/* --- Main Content Layout --- */
.site-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 2rem;
    padding-bottom: 2rem;
}

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

.main-column, .sidebar-column {
    width: 100%;
}

/* --- Cards & Buttons --- */
.card, .article-card, .widget, .article-content {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: background-color 0.3s ease, transform 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #3e8e41;
    color: var(--white);
    text-decoration: none;
    transform: translateY(-2px);
}

/* --- Articles Section (Homepage) --- */
.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

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

.article-card {
    display: flex;
    flex-direction: column;
}

.article-card h3 {
    color: var(--primary-color);
}

.article-card p {
    flex-grow: 1;
}

/* --- Sidebar --- */
.widget-title {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.widget-list {
    list-style: none;
    padding: 0;
}

.widget-list li {
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--light-grey);
    padding-bottom: 0.5rem;
}

.widget-list li:last-child {
    border-bottom: none;
}

.widget-list a {
    font-weight: 700;
}

.promo-widget {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    text-align: center;
}

.promo-widget h3 {
    color: var(--white);
}

/* --- Article Page --- */
.article-header {
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.article-meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

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

.article-content h2 {
    color: var(--primary-color);
    margin-top: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 0.5rem;
}

.article-content h3 {
    color: var(--secondary-color);
    margin-top: 1.5rem;
}

.cta-section {
    background-color: var(--light-grey);
    border-left: 5px solid var(--accent-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: var(--border-radius);
}

/* --- Footer --- */
.site-footer {
    background-color: var(--secondary-color);
    color: #ccc;
    padding: 3rem 0;
    margin-top: 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
        text-align: left;
    }
}

.site-footer h4 {
    color: var(--white);
    margin-bottom: 1rem;
}

.site-footer p, .site-footer a {
    color: #ccc;
    font-size: 0.9rem;
}

.site-footer a:hover {
    color: var(--white);
}

.footer-links ul {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-legal {
    grid-column: 1 / -1;
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #444;
}

/* --- Responsive Adjustments --- */
@media (max-width: 767px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    .main-nav ul {
        flex-direction: column;
        align-items: center;
    }

    .main-nav ul li a {
        padding: 0.6rem 1rem;
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
}