/* --- CSS Variables --- */
:root {
    --primary-color: #0a4d68;
    --secondary-color: #088395;
    --accent-color: #fca311;
    --light-color: #ffffff;
    --dark-color: #232931;
    --background-color: #f8f9fa;
    --text-color: #343a40;
    --border-radius: 8px;
    --box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
}

h1, h2, h3 {
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

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

p {
    margin-bottom: 1rem;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

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

ul {
    list-style: none;
}

/* --- Header & Navigation --- */
header {
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--light-color);
}

.logo:hover {
    color: var(--light-color);
    text-decoration: none;
}

nav ul {
    display: flex;
    gap: 1.5rem;
}

nav a {
    color: var(--light-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width var(--transition-speed);
}

nav a:hover::after,
nav a.active::after {
    width: 100%;
}

/* --- Main Layout --- */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

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

main {
    background: var(--light-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* --- Hero Section --- */
.hero .intro {
    font-size: 1.1rem;
    font-weight: 500;
}

/* --- Articles Grid & Cards --- */
.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 1024px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.card {
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.card h3 {
    margin-top: 0;
}

.card p {
    flex-grow: 1;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--light-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: bold;
    text-align: center;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
}

.btn:hover {
    background-color: var(--accent-color);
    color: var(--dark-color);
    text-decoration: none;
    transform: translateY(-2px);
}

/* --- Sidebar & Widgets --- */
aside .widget {
    background: var(--light-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.widget h3 {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
    margin-top: 0;
}

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

.widget ul li a {
    font-weight: 500;
}

.widget.promo {
    background-color: var(--primary-color);
    color: var(--light-color);
}

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

/* --- Article Page Specifics --- */
.article-header {
    border-bottom: 1px solid #eee;
    margin-bottom: 2rem;
}
.article-meta {
    font-size: 0.9rem;
    color: #6c757d;
    margin-bottom: 1rem;
}

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

.article-content ul, .article-content ol {
    list-style-position: inside;
    margin-bottom: 1rem;
    padding-left: 1rem;
}
.article-content ul li, .article-content ol li {
    margin-bottom: 0.5rem;
}

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

.cta-box p {
    margin: 0 0 1rem 0;
}

/* --- Footer --- */
footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    text-align: center;
    padding: 2rem 1.5rem;
    margin-top: 2rem;
}

.footer-links a {
    color: var(--light-color);
    margin: 0 0.5rem;
}
.footer-links a:hover {
    color: var(--accent-color);
}


/* --- Mobile Responsiveness --- */
@media (max-width: 600px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    main, aside .widget {
        padding: 1.5rem;
    }
}