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

:root {
    color-scheme: light;
    --text: #1f2933;
    --muted: #52606d;
    --brand: #0b5cab;
    --border: #e2e8f0;
    --bg: #f5f7fa;
    --card: #ffffff;
}

body {
    font-family: "Segoe UI", Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}

main {
    max-width: 920px;
    margin: 40px auto;
    padding: 32px 40px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
}

h1 {
    font-size: 2.2rem;
    color: var(--brand);
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

h2 {
    font-size: 1.25rem;
    margin-top: 28px;
    margin-bottom: 10px;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

h3 {
    font-size: 1.05rem;
    margin-top: 18px;
    margin-bottom: 6px;
    color: var(--brand);
}

p {
    margin-bottom: 12px;
    color: var(--muted);
}

p strong {
    color: var(--text);
}

@media (max-width: 900px) {
    main {
        margin: 24px;
        padding: 24px;
    }
}

@media (max-width: 600px) {
    main {
        margin: 16px;
        padding: 18px;
        border-radius: 8px;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.1rem;
    }
}