:root {
    --bg: #f7f8fa;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --accent: #1e40af;
    --accent-soft: #eef2ff;
    --accent-soft-border: #dbe4ff;
    --border: #e5e7eb;
}

* { box-sizing: border-box; }

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

header.page-header {
    background: var(--accent);
    color: #fff;
    padding: 32px 20px;
    text-align: center;
}
header.page-header h1 {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 600;
}
header.page-header p {
    margin: 8px 0 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
}

main {
    max-width: 760px;
    margin: 24px auto;
    padding: 0 20px 60px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.badge {
    display: inline-block;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
    letter-spacing: 0.3px;
    margin-bottom: 16px;
}

h2 {
    font-size: 1.1rem;
    margin: 28px 0 10px;
    color: var(--text);
}
h2:first-of-type { margin-top: 0; }

p, li { font-size: 0.97rem; color: var(--text); }
ul { padding-left: 20px; }
li { margin: 6px 0; }

.meta {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 4px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.callout {
    background: var(--accent-soft);
    border: 1px solid var(--accent-soft-border);
    border-radius: 10px;
    padding: 16px 20px;
    margin-top: 24px;
}

.nav-grid {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}
.nav-grid a {
    display: block;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    transition: border-color 0.15s ease, transform 0.05s ease;
}
.nav-grid a:hover {
    border-color: var(--accent);
    text-decoration: none;
}
.nav-grid a strong { display: block; color: var(--text); margin-bottom: 4px; }
.nav-grid a span { color: var(--muted); font-size: 0.9rem; }

footer.page-footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted);
    padding: 16px 20px 32px;
}

.back-link {
    display: inline-block;
    margin-bottom: 18px;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .card { padding: 22px 18px; }
    header.page-header h1 { font-size: 1.35rem; }
}