@font-face { font-family: 'Bisotun Sans'; font-weight: 400; font-style: normal; font-display: swap; src: url('fonts/bisotun-sans-400.woff2') format('woff2'); }
@font-face { font-family: 'Bisotun Sans'; font-weight: 500; font-style: normal; font-display: swap; src: url('fonts/bisotun-sans-500.woff2') format('woff2'); }
@font-face { font-family: 'Bisotun Sans'; font-weight: 600; font-style: normal; font-display: swap; src: url('fonts/bisotun-sans-600.woff2') format('woff2'); }
@font-face { font-family: 'Bisotun Sans'; font-weight: 700; font-style: normal; font-display: swap; src: url('fonts/bisotun-sans-700.woff2') format('woff2'); }

:root {
  --primary: #0F5C63; --primary-deep: #0B4A50; --on-primary: #FFFFFF;
  --secondary: #C8A46A; --accent: #238C84;
  --ink: #14212B; --ink-muted: #4A5A66;
  --surface: #F6F4EF; --surface-alt: #ECE7DC; --card: #FFFFFF; --border: #D9D2C3;
  --link: #0F5C63; --code-bg: #ECE7DC; --pre-bg: #14212B; --pre-ink: #E8ECEF;
  --warning: #935700;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #4FB3AA; --primary-deep: #0B4A50; --on-primary: #062A2D;
    --secondary: #D9BC8A; --accent: #5CC6BC;
    --ink: #E8ECEF; --ink-muted: #A9B6BF;
    --surface: #10181E; --surface-alt: #18232B; --card: #1C2830; --border: #2C3A44;
    --link: #7FD1C8; --code-bg: #18232B; --pre-bg: #0B1216; --pre-ink: #E8ECEF;
    --warning: #FFB960;
    color-scheme: dark;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  margin: 0; background: var(--surface); color: var(--ink);
  font: 400 16px/1.65 'Bisotun Sans', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
}
a { color: var(--link); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1280px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand img { height: 36px; width: auto; display: block; }
.brand span { font-weight: 600; color: var(--ink-muted); border-inline-start: 1px solid var(--border); padding-inline-start: 12px; }
.topnav { display: flex; gap: 4px; flex-wrap: wrap; margin-inline-start: auto; }
.topnav a {
  text-decoration: none; color: var(--ink); padding: 6px 12px; border-radius: 12px; font-weight: 500;
}
.topnav a:hover { background: var(--surface-alt); }
.topnav a[aria-current="page"] { background: var(--primary); color: var(--on-primary); }

.layout {
  max-width: 1280px; margin: 0 auto; padding: 24px 16px 64px;
  display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 32px; align-items: start;
}
.toc {
  position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow: auto;
  font-size: 14px; padding: 16px; background: var(--card); border: 1px solid var(--border); border-radius: 16px;
}
.toc summary { font-weight: 600; cursor: pointer; }
.toc ul { list-style: none; margin: 8px 0 0; padding: 0; }
.toc ul ul { margin: 2px 0 6px; padding-inline-start: 12px; }
.toc li { margin: 2px 0; }
.toc a { color: var(--ink-muted); text-decoration: none; display: block; padding: 2px 4px; border-radius: 6px; }
.toc a:hover { color: var(--ink); background: var(--surface-alt); }

main.content {
  min-width: 0; background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 32px clamp(16px, 4vw, 48px);
}
main.content > :first-child { margin-top: 0; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }
h1 { font-size: 2rem; color: var(--primary); margin: 0 0 16px; }
h2 { font-size: 1.45rem; margin: 48px 0 12px; padding-top: 16px; border-top: 1px solid var(--border); }
h3 { font-size: 1.15rem; margin: 32px 0 8px; }
h2 .anchor, h3 .anchor { margin-inline-start: 8px; color: var(--border); text-decoration: none; font-weight: 400; opacity: 0; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }
h1 .anchor { display: none; }
hr + h2 { border-top: 0; margin-top: 0; padding-top: 0; }
hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
p, ul, ol { margin: 0 0 14px; }
li { margin: 4px 0; }
li > ul, li > ol { margin-bottom: 0; }
strong { font-weight: 700; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;
  font-size: 0.88em; background: var(--code-bg); padding: 1px 5px; border-radius: 6px;
  overflow-wrap: anywhere;
}
pre {
  background: var(--pre-bg); color: var(--pre-ink); padding: 16px; border-radius: 12px;
  overflow-x: auto; line-height: 1.5; margin: 0 0 16px; font-size: 14px;
}
pre code { background: none; padding: 0; font-size: inherit; color: inherit; overflow-wrap: normal; white-space: pre; }

.table-wrap { overflow-x: auto; margin: 0 0 16px; border: 1px solid var(--border); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: start; vertical-align: top; padding: 8px 12px; border-bottom: 1px solid var(--border); }
th { background: var(--surface-alt); font-weight: 600; }
tr:last-child td { border-bottom: 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 24px 0; }
.card {
  display: block; text-decoration: none; color: var(--ink); background: var(--surface);
  border: 1px solid var(--border); border-radius: 16px; padding: 20px; border-top: 4px solid var(--secondary);
}
.card:hover { border-color: var(--primary); }
.card h2 { border: 0; margin: 0 0 8px; padding: 0; font-size: 1.2rem; color: var(--primary); }
.card p { margin: 0; color: var(--ink-muted); }
.lead { font-size: 1.1rem; color: var(--ink-muted); max-width: 60ch; }
.facts { display: flex; gap: 8px; flex-wrap: wrap; padding: 0; list-style: none; }
.facts li { background: var(--surface-alt); border-radius: 999px; padding: 4px 12px; font-size: 14px; }

footer.site {
  max-width: 1280px; margin: 0 auto; padding: 0 16px 32px; color: var(--ink-muted); font-size: 14px;
}

@media (max-width: 960px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .toc { position: static; max-height: none; }
  .toc:not([open]) { padding-block: 12px; }
  .brand span { display: none; }
}
@media (max-width: 560px) {
  body { font-size: 15px; }
  h1 { font-size: 1.6rem; }
  main.content { padding: 20px 16px; border-radius: 12px; }
  .topnav { margin-inline-start: 0; width: 100%; }
  .topnav a { padding: 6px 10px; }
}
@media print {
  .topbar, .toc { display: none; }
  .layout { display: block; }
  main.content { border: 0; }
  pre { white-space: pre-wrap; }
}