:root {
    color-scheme: light;
    --background: #f5f7fa;
    --surface: #ffffff;
    --text: #172033;
    --muted: #596579;
    --primary: #2457c5;
    --primary-dark: #173c91;
    --border: #dce2eb;
    --soft: #eef3ff;
    --shadow: 0 12px 32px rgba(23, 32, 51, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    background: var(--background);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 17px;
    line-height: 1.65;
}

body {
    margin: 0;
}

a {
    color: var(--primary);
    text-underline-offset: 0.18em;
}

a:hover {
    color: var(--primary-dark);
}

a:focus-visible {
    border-radius: 4px;
    outline: 3px solid rgba(36, 87, 197, 0.3);
    outline-offset: 3px;
}

.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.nav-wrap {
    align-items: center;
    display: flex;
    gap: 24px;
    justify-content: space-between;
    margin: 0 auto;
    max-width: 900px;
    padding: 18px 24px;
}

.brand {
    color: var(--text);
    font-size: 1.05rem;
    font-weight: 700;
    text-decoration: none;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
}

.site-nav a {
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 600;
    text-decoration: none;
}

.site-nav a[aria-current="page"] {
    color: var(--primary);
}

main {
    margin: 0 auto;
    max-width: 900px;
    padding: 48px 24px 64px;
}

.hero {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: clamp(28px, 6vw, 56px);
}

.eyebrow {
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin: 0 0 8px;
    text-transform: uppercase;
}

h1,
h2,
h3 {
    line-height: 1.25;
}

h1 {
    font-size: clamp(2rem, 7vw, 3.5rem);
    letter-spacing: -0.035em;
    margin: 0;
}

.subtitle {
    color: var(--primary);
    font-size: clamp(1.15rem, 3vw, 1.45rem);
    font-weight: 650;
    margin: 8px 0 20px;
}

.lead {
    color: var(--muted);
    font-size: 1.08rem;
    margin: 0;
    max-width: 720px;
}

.content-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    margin-top: 28px;
    padding: clamp(24px, 5vw, 40px);
}

.content-card h1 {
    font-size: clamp(1.9rem, 5vw, 2.7rem);
    margin-bottom: 8px;
}

.content-card h2 {
    font-size: 1.35rem;
    margin: 36px 0 10px;
}

.content-card h2:first-of-type {
    margin-top: 28px;
}

.content-card p,
.content-card li {
    color: var(--muted);
}

.content-card strong {
    color: var(--text);
}

.meta {
    color: var(--muted);
    font-size: 0.9rem;
    margin-top: 0;
}

.feature-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    list-style: none;
    margin: 24px 0 0;
    padding: 0;
}

.feature-grid li {
    background: var(--soft);
    border-radius: 12px;
    color: var(--text);
    font-weight: 600;
    padding: 14px 16px;
}

.page-links {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 24px;
}

.page-link {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--text);
    display: block;
    font-weight: 700;
    padding: 20px;
    text-decoration: none;
}

.page-link:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.notice {
    background: var(--soft);
    border-left: 4px solid var(--primary);
    border-radius: 8px;
    color: var(--text);
    padding: 16px 18px;
}

.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.footer-wrap {
    color: var(--muted);
    margin: 0 auto;
    max-width: 900px;
    padding: 28px 24px 36px;
}

.footer-wrap p {
    margin: 3px 0;
}

@media (max-width: 680px) {
    .nav-wrap {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .site-nav {
        gap: 8px 16px;
    }

    main {
        padding-top: 28px;
    }

    .feature-grid,
    .page-links {
        grid-template-columns: 1fr;
    }
}