:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --card-bg: #f3f4f6;
    --max-width: 800px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 0;
}

header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    text-align: center;
    padding: 4rem 0;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    letter-spacing: -0.025em;
}

header p {
    opacity: 0.8;
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

section {
    margin-bottom: 3rem;
}

h2, h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--card-bg);
    padding-bottom: 0.5rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    transition: transform 0.2s;
}

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

.card h4 {
    margin-top: 0;
    color: #111827;
}

footer {
    background: #f9fafb;
    padding: 2rem 0;
    text-align: center;
    font-size: 0.9rem;
    color: #6b7280;
    border-top: 1px solid #e5e7eb;
}

footer a {
    color: inherit;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 1.8rem;
    }
}