:root {
    --primary: #003178;
    --primary-light: #0d47a1;
    --surface: #ffffff;
    --surface-low: #f3f3f3;
    --on-surface: #1a1c1c;
    --on-surface-variant: #434652;
    --border: #e5e7eb;
}
[data-theme="dark"] {
    --primary: #b0c6ff;
    --surface: #0f1115;
    --surface-low: #22252d;
    --on-surface: #e2e2e9;
    --on-surface-variant: #c3c6d4;
    --border: #2a2d35;
}
* { box-sizing: border-box; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.65;
    color: var(--on-surface);
    background: var(--surface);
    margin: 0;
    padding: 0;
}
.doc-nav {
    background: var(--primary);
    color: #fff;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 10;
}
.doc-nav a { color: #fff; text-decoration: none; opacity: 0.9; margin-right: 1.2rem; font-size: 0.9rem; }
.doc-nav a:hover { opacity: 1; }
.doc-nav-brand { font-weight: 700; font-size: 1rem; }
.doc-nav-spacer { flex: 1; }
.doc-lang-switch {
    float: right;
    font-size: 0.85rem;
    border: 1px solid rgba(255,255,255,0.4);
    padding: 0.2rem 0.7rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}
.doc-lang-switch.active { background: rgba(255,255,255,0.18); }
.doc-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 3rem 2rem 5rem;
}
h1 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin: 0 0 1rem;
    color: var(--primary);
}
h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 3rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
    color: var(--primary);
}
h3 { font-size: 1.2rem; font-weight: 700; margin: 2rem 0 0.8rem; }
h4 { font-size: 1.05rem; margin: 1.5rem 0 0.6rem; }
p, ul, ol { margin: 0 0 1rem; font-size: 1rem; }
ul, ol { padding-left: 1.5rem; }
li { margin-bottom: 0.4rem; }
strong { font-weight: 700; }
em { color: var(--on-surface-variant); }
code {
    background: var(--surface-low);
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'JetBrains Mono', monospace;
}
pre { background: var(--surface-low); padding: 1rem; border-radius: 8px; overflow-x: auto; }
pre code { background: transparent; padding: 0; }
blockquote {
    margin: 1.5rem 0;
    padding: 0.8rem 1.5rem;
    border-left: 4px solid var(--primary);
    background: var(--surface-low);
    font-style: italic;
    color: var(--on-surface-variant);
}
table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.92rem; }
th, td { border: 1px solid var(--border); padding: 0.6rem 0.8rem; text-align: left; vertical-align: top; }
th { background: var(--surface-low); font-weight: 700; }
hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }
a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.doc-footer {
    max-width: 820px;
    margin: 0 auto;
    padding: 2rem;
    border-top: 1px solid var(--border);
    color: var(--on-surface-variant);
    font-size: 0.88rem;
}
.doc-footer a { color: var(--primary); }
@media print {
    .doc-nav { display: none; }
    body { font-size: 11pt; }
    .doc-container { max-width: none; padding: 0; }
    h2 { page-break-after: avoid; }
    table { page-break-inside: avoid; }
}