:root {
  --bg: #0d1117; --surface: #161b22; --border: #30363d;
  --text: #e6edf3; --muted: #8b949e; --accent: #58a6ff;
  --green: #3fb950; --orange: #d29922; --purple: #8957e5;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff; --surface: #f6f8fa; --border: #d1d5db;
    --text: #1f2937; --muted: #6b7280; --accent: #2563eb;
    --green: #16a34a; --orange: #d97706; --purple: #7c3aed;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', system-ui, sans-serif;
  background: var(--bg); color: var(--text); min-height: 100vh; line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 800px; margin: 0 auto; padding: 2rem 1.5rem; }
/* Hero */
.hero { text-align: center; padding: 4rem 0 3rem; }
.hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: .75rem; }
.hero .tagline { font-size: 1.15rem; color: var(--muted); max-width: 550px; margin: 0 auto 2rem; }
.hero .cta { display: inline-flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.btn { display: inline-block; padding: .65rem 1.5rem; border-radius: 8px; font-weight: 700; font-size: .9rem; transition: all .2s; }
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { opacity: .85; text-decoration: none; }
.btn-secondary { border: 1px solid var(--border); color: var(--text); }
.btn-secondary:hover { border-color: var(--accent); text-decoration: none; }
/* Sections */
section { padding: 2.5rem 0; }
section h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 1.25rem; text-align: center; }
section h2 .label { font-size: .75rem; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: 1.5px; display: block; margin-bottom: .5rem; }
/* Cards */
.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 600px) { .grid-2, .grid-4 { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; }
.card h3 { font-size: .95rem; font-weight: 700; margin-bottom: .5rem; }
.card p { font-size: .85rem; color: var(--muted); line-height: 1.6; }
.card .icon { font-size: 1.5rem; margin-bottom: .5rem; }
/* Comparison table */
.compare-table { width: 100%; border-collapse: collapse; font-size: .82rem; }
.compare-table th, .compare-table td { padding: .6rem .75rem; text-align: left; border-bottom: 1px solid var(--border); }
.compare-table th { color: var(--muted); font-weight: 600; font-size: .75rem; text-transform: uppercase; letter-spacing: .5px; }
.compare-table td:first-child { font-weight: 600; }
/* Code block */
.code-block { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; font-family: 'SF Mono', monospace; font-size: .82rem; color: var(--muted); overflow-x: auto; margin: 1rem 0; }
/* File tree */
.file-tree { font-family: 'SF Mono', monospace; font-size: .78rem; color: var(--muted); line-height: 1.8; }
.file-tree .highlight { color: var(--accent); font-weight: 600; }
/* Footer */
footer { text-align: center; padding: 2rem 0; font-size: .75rem; color: var(--muted); border-top: 1px solid var(--border); margin-top: 2rem; }
/* Callout */
.callout { background: rgba(88,166,255,.06); border: 1px solid rgba(88,166,255,.15); border-radius: 12px; padding: 1.25rem; margin: 1.5rem 0; font-size: .88rem; }
/* Doc pages */
.doc-nav { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.5rem; max-width: 800px; margin: 0 auto; font-size: .85rem; }
.doc-nav .nav-links { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.doc-nav .nav-links a { color: var(--muted); padding: .15rem .4rem; }
.doc-nav .nav-links a.active { color: var(--accent); font-weight: 600; }
.nav-group { display: inline-flex; align-items: center; gap: .35rem; }
.nav-group + .nav-group { margin-left: .75rem; padding-left: .75rem; border-left: 1px solid var(--border); }
.nav-label { font-size: .65rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); font-weight: 600; }
.doc-container h1 { font-size: 1.8rem; font-weight: 800; margin-bottom: .75rem; }
.doc-container h3 { font-size: 1rem; font-weight: 700; margin: 1.5rem 0 .75rem; }
.doc-container section h2 { text-align: left; }
.doc-container p { margin-bottom: .75rem; }
.doc-intro { font-size: 1.05rem; color: var(--muted); margin-bottom: 2rem; }
.doc-bottom-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); flex-wrap: wrap; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 600px) { .grid-3 { grid-template-columns: 1fr; } }
.source-line { font-size: .78rem; color: var(--muted); margin-top: .5rem; }
code { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: .15rem .4rem; font-family: 'SF Mono', monospace; font-size: .82rem; }
.muted { color: var(--muted); font-size: .82rem; }
/* Focus */
a:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
/* Reduced motion */
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: 0.01ms !important; } }

/* Language Switcher */
.lang-switch {
  position: fixed; top: 1rem; right: 1.5rem; z-index: 100;
  display: flex; gap: 0.25rem; background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 0.2rem;
}
.lang-btn {
  padding: 0.3rem 0.6rem; border-radius: 6px; border: none; background: transparent;
  color: var(--muted); cursor: pointer; font-size: 0.8rem; font-weight: 600;
  transition: all 0.2s; font-family: inherit;
}
.lang-btn.active { background: var(--accent); color: var(--bg); }
.lang-btn:hover:not(.active) { color: var(--text); }
[lang="de"] .en, [lang="en"] .de { display: none; }
@media (max-width: 600px) { .lang-switch { top: 0.75rem; right: 1rem; } }