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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: #1a1a1a;
    background: #ffffff;
    padding: 24px 20px 60px;
    max-width: 760px;
    margin: 0 auto;
}

header {
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: 20px;
    margin-bottom: 32px;
}

header h1 {
    font-size: 26px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 6px;
}

header p {
    font-size: 13px;
    color: #6b7280;
}

h1 { font-size: 26px; font-weight: 700; color: #111827; margin-bottom: 16px; }

h2 {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    margin: 36px 0 12px;
    padding-left: 12px;
    border-left: 4px solid #f59e0b;
}

h3 {
    font-size: 15px;
    font-weight: 600;
    color: #374151;
    margin: 20px 0 8px;
}

h4 {
    font-size: 14px;
    font-weight: 600;
    color: #374151;
    margin: 16px 0 6px;
}

p { margin-bottom: 12px; }

ul, ol {
    padding-left: 22px;
    margin-bottom: 12px;
}

li { margin-bottom: 4px; }

a { color: #d97706; text-decoration: none; }
a:hover { text-decoration: underline; }

.highlight {
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 8px;
    padding: 14px 16px;
    margin: 24px 0;
    font-size: 14px;
    color: #78350f;
}

.section-divider {
    border: none;
    border-top: 1px solid #e5e7eb;
    margin: 32px 0;
}

footer {
    margin-top: 48px;
    padding-top: 20px;
    border-top: 1px solid #e5e7eb;
    font-size: 13px;
    color: #6b7280;
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    body { background: #0f172a; color: #e2e8f0; }
    header { border-color: #334155; }
    header h1 { color: #f1f5f9; }
    header p { color: #94a3b8; }
    h1 { color: #f1f5f9; }
    h2 { color: #f1f5f9; border-color: #f59e0b; }
    h3 { color: #cbd5e1; }
    h4 { color: #cbd5e1; }
    .highlight { background: #1c1917; border-color: #78350f; color: #fde68a; }
    hr.section-divider { border-color: #334155; }
    footer { border-color: #334155; color: #64748b; }
    a { color: #fbbf24; }
}