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

:root {
    --color-primary: #1a365d;
    --color-accent: #2b6cb0;
    --color-bg: #ffffff;
    --color-text: #1a202c;
    --color-muted: #718096;
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Hero */
.hero {
    text-align: center;
    padding: 4rem 0 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.2rem;
    color: var(--color-muted);
}

/* Features */
.features {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.5rem;
    padding: 2rem 0;
}

.feature {
    text-align: center;
    padding: 1.5rem;
}

.feature h3 {
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.feature p {
    color: var(--color-muted);
    font-size: 0.95rem;
}

/* Certifications */
.certifications {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid #e2e8f0;
    border-bottom: 1px solid #e2e8f0;
    color: var(--color-muted);
}

/* Contact */
.contact {
    text-align: center;
    padding: 2rem 0;
}

.contact h2 {
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.contact a {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 1.1rem;
}

.contact a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1.5rem;
    border-top: 1px solid #e2e8f0;
    color: var(--color-muted);
    font-size: 0.85rem;
}

footer a {
    color: var(--color-muted);
    text-decoration: none;
}

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

footer p {
    margin-top: 0.5rem;
}

/* Responsive */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 2rem;
    }

    .features {
        grid-template-columns: 1fr;
    }
}