:root {
    --primary-color: #2c3e50;
    --secondary-color: #27ae60;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f4f7f6;
    --white: #ffffff;
    --container-width: 1100px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.logo a {
    color: var(--white);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo span {
    color: var(--secondary-color);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--secondary-color);
}

main {
    padding: 2rem 0;
}

article {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

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

h1 { font-size: 2.5rem; line-height: 1.2; }
h2 { font-size: 1.8rem; margin-top: 2rem; }

p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
}

ul, ol {
    margin-bottom: 1.2rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-color), #34495e);
    color: var(--white);
    border-radius: 8px;
    margin-bottom: 2rem;
}

.hero h1 { color: var(--white); }

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-card h3 a {
    color: var(--primary-color);
    text-decoration: none;
}

.article-card .btn {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 1rem;
}

footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

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

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
}

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

.footer-bottom {
    text-align: center;
    border-top: 1px solid #34495e;
    padding-top: 1rem;
    font-size: 0.9rem;
    color: #bdc3c7;
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    nav ul {
        margin-top: 1rem;
    }
    nav ul li {
        margin: 0 10px;
    }
    h1 { font-size: 2rem; }
}