/* --- Base / Reset --- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  color: #0f172a;
  background: #ffffff;
}

@media (prefers-color-scheme: dark) {
  body { color: #e2e8f0; background: #0b1020; }
}

/* Accessibility */
.skip-link {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus { position: static; width: auto; height: auto; padding: .5rem .75rem; background: #ffe08a; color: #111827; }

/* --- Header (integrated) --- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: #0f172a; color: #fff;
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header .wrap {
  max-width: 1200px; margin: 0 auto; padding: .85rem 1rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { display: inline-flex; align-items: center; gap: .6rem; color: #fff; text-decoration: none; font-weight: 700; }
.brand-logo { display: inline-block; width: 28px; height: 28px; }
.brand-text { letter-spacing: .2px; }

.nav-toggle {
  display: none; appearance: none; border: 1px solid rgba(255,255,255,.35);
  background: transparent; color: #fff; padding: .4rem .6rem; border-radius: 8px; cursor: pointer;
}
.main-nav ul { list-style: none; display: flex; gap: 1rem; margin: 0; padding: 0; }
.main-nav a { color: #e2e8f0; text-decoration: none; }
.main-nav a:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .main-nav { position: fixed; right: 1rem; top: 3.5rem; background: #0f172a; border: 1px solid rgba(148,163,184,.35); border-radius: 12px; padding: .75rem; display: none; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: .5rem; }
}

/* --- Layout --- */
.container { max-width: 1200px; margin: 0 auto; padding: 1.25rem; }
.doc { display: grid; grid-template-columns: 280px 1fr; gap: 2rem; margin: 2rem 0; }
.doc-header { grid-column: 1 / -1; margin-bottom: .5rem; }
.doc-header h1 { margin: 0 0 .25rem; font-size: clamp(1.75rem, 1.2rem + 1.8vw, 2.4rem); }
.meta { color: #475569; }
@media (prefers-color-scheme: dark) { .meta { color: #a3b2c7; } }

/* Table of contents */
.toc {
  position: sticky; top: 5.5rem; align-self: start;
  border: 1px solid rgba(148,163,184,.35);
  border-radius: 12px; padding: 1rem; background: rgba(241,245,249,.6);
}
@media (prefers-color-scheme: dark) {
  .toc { background: rgba(15,23,42,.35); border-color: rgba(148,163,184,.25); }
}
.toc h2 { margin: 0 0 .5rem; font-size: 1rem; }
.toc ol { margin: 0; padding-left: 1.1rem; display: grid; gap: .25rem; }
.toc a { color: inherit; text-decoration: none; }
.toc a:hover { text-decoration: underline; }

/* Doc content */
.doc-body { min-width: 0; }
.doc-body h2 { margin-top: 2rem; margin-bottom: .5rem; font-size: 1.375rem; }
.doc-body h3 { margin-top: 1rem; margin-bottom: .5rem; font-size: 1.05rem; }
.doc-body p, .doc-body li { color: inherit; }
.doc-body ul { padding-left: 1.25rem; }
.doc-body a { color: #16a34a; text-decoration: underline; text-underline-offset: 3px; }
.doc-body a:hover { text-decoration-thickness: 2px; }

/* Back to top */
.back-top { margin-top: 2rem; }
.back-top a { text-decoration: none; border: 1px solid rgba(100,116,139,.5); padding: .5rem .75rem; border-radius: 10px; }
.back-top a:hover { background: rgba(16,185,129,.08); border-color: rgba(16,185,129,.6); }

/* Footer */
.site-footer { border-top: 1px solid rgba(148,163,184,.35); }
.site-footer .wrap { max-width: 1200px; margin: 0 auto; padding: 1.5rem 1rem; color: #64748b; display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; justify-content: space-between; }
.site-footer nav a { color: inherit; text-decoration: none; margin-right: .5rem; }
.site-footer nav a:hover { text-decoration: underline; }
@media (prefers-color-scheme: dark) { .site-footer .wrap { color: #94a3b8; } }

/* Responsive */
@media (max-width: 960px) {
  .doc { grid-template-columns: 1fr; }
  .toc { position: relative; top: 0; }
}

/* Print styles */
@media print {
  .site-header, .toc, .back-top, .site-footer, .nav-toggle, .main-nav { display: none !important; }
  .container { max-width: none; padding: 0; }
  .doc { display: block; }
  a { color: inherit; text-decoration: none; }
}

/* Live-nav touches */
.main-nav .cta { font-weight: 700; padding: .35rem .65rem; border: 1px solid rgba(255,255,255,.35); border-radius: 10px; }
.main-nav .cta:hover { text-decoration: none; border-color: rgba(34,197,94,.8); }
.nav-phone a { color: #93c5fd; }