/* Rotaidem Help (rotaidem.info). The same flight-deck look as rotaidem.com: steel on black, headings in
   B612 (the typeface drawn for Airbus cockpit displays), text in IBM Plex Sans. Fonts are served from this
   site (SIL Open Font License, see /assets/fonts/OFL-*.txt). */
@font-face { font-family: 'IBM Plex Sans'; font-weight: 400; font-display: swap; src: url(/assets/fonts/ibm-plex-sans-latin-400-normal.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'IBM Plex Sans'; font-weight: 400; font-display: swap; src: url(/assets/fonts/ibm-plex-sans-latin-ext-400-normal.woff2) format('woff2'); unicode-range: U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: 'IBM Plex Sans'; font-weight: 600; font-display: swap; src: url(/assets/fonts/ibm-plex-sans-latin-600-normal.woff2) format('woff2'); }
@font-face { font-family: 'B612'; font-weight: 700; font-display: swap; src: url(/assets/fonts/b612-latin-700-normal.woff2) format('woff2'); }

:root {
  --bg: #111315; --bg-2: #16191c; --bg-3: #1c2024; --line: #262a2e; --line-2: #30353a;
  --ink: #eef0f2; --text: #c0c4c9; --muted: #878d94; --accent: #aab6c2; --accent-hover: #cfd7de;
  --ok: #4cc38a; --warn: #f5a524; --danger: #e5484d; --blue: #3987e5;
  --display: "B612", "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
  --wrap: 1240px;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 84px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.7 "IBM Plex Sans", "Segoe UI", Arial, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--ink); text-decoration-color: rgba(170, 182, 194, .5); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.2; margin: 0 0 .5em; }
h1 { font-family: var(--display); font-weight: 700; font-size: clamp(30px, 4vw, 44px); letter-spacing: -.02em; }
h2 { font-size: 24px; font-weight: 600; letter-spacing: -.01em; }
h3 { font-size: 18px; font-weight: 600; }
p { margin: 0 0 1em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--accent); color: #0b0c0e; }
.muted { color: var(--muted); }
.skip-link { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: #0b0c0e; padding: 8px 14px; z-index: 50; }
.skip-link:focus { left: 8px; }
main { max-width: var(--wrap); margin: 0 auto; padding: 40px 24px 80px; min-height: 60vh; }
main:focus { outline: none; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 20; background: rgba(17, 19, 21, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar-in { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; height: 64px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-family: var(--display); font-size: 15px; letter-spacing: .14em; text-transform: uppercase; white-space: nowrap; }
.brand b { color: var(--accent); font-weight: 700; }
.site-nav { display: flex; gap: 4px; flex: 1; overflow-x: auto; }
.site-nav a { text-decoration: none; color: var(--text); padding: 8px 12px; border-radius: 6px; font-size: 15px; white-space: nowrap; }
.site-nav a:hover, .site-nav a[aria-current] { color: var(--ink); background: var(--bg-3); }
.topbar-end { display: flex; align-items: center; gap: 16px; margin-left: auto; }
.icon-link { color: var(--text); display: inline-flex; padding: 6px; border-radius: 6px; }
.icon-link:hover { color: var(--ink); background: var(--bg-3); }
.out { font-size: 14px; color: var(--muted); text-decoration: none; white-space: nowrap; }
.out:hover { color: var(--ink); }
.menu-toggle { display: none; margin-left: auto; background: none; color: var(--ink); border: 1px solid var(--line-2); border-radius: 6px; padding: 6px 12px; font: inherit; font-size: 14px; cursor: pointer; }

/* home */
.hero { text-align: center; padding: 56px 0 48px; border-bottom: 1px solid var(--line); margin-bottom: 48px;
  background: radial-gradient(ellipse 60% 70% at 50% 0%, rgba(170, 182, 194, .10), transparent 70%); }
.hero h1 { font-size: clamp(34px, 5vw, 54px); }
.hero p { color: var(--muted); font-size: 19px; margin-bottom: 28px; }
.search-box { display: flex; max-width: 640px; margin: 0 auto; border: 1px solid var(--line-2); border-radius: 10px; background: var(--bg-2); overflow: hidden; }
.search-box:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(170, 182, 194, .18); }
.search-box input { flex: 1; min-width: 0; background: none; border: 0; color: var(--ink); font: inherit; font-size: 17px; padding: 15px 18px; }
.search-box input:focus { outline: none; }
.search-box input::placeholder { color: var(--muted); }
.search-box button { background: var(--accent); color: #0b0c0e; border: 0; font: inherit; font-weight: 600; padding: 0 22px; cursor: pointer; }
.search-box button:hover { background: var(--accent-hover); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; margin-bottom: 56px; }
.card { display: flex; flex-direction: column; text-decoration: none; background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: 24px; transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h2 { font-family: var(--display); font-size: 22px; margin-bottom: 8px; }
.card p { color: var(--text); flex: 1; }
.card .count { font-size: 13px; color: var(--muted); }
.latest { margin-bottom: 56px; }

/* lists of guides */
.page-head { margin-bottom: 36px; max-width: 760px; }
.page-head p { color: var(--muted); font-size: 18px; }
.section-list { margin-bottom: 36px; }
.section-list h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); font-weight: 600; margin-bottom: 10px; }
.links { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.links li { border-bottom: 1px solid var(--line); padding: 12px 2px; display: flex; flex-direction: column; gap: 2px; }
.links li a { font-weight: 600; text-decoration: none; }
.links li a:hover { text-decoration: underline; }
.links .muted { font-size: 14px; }
.crumbs { font-size: 14px; color: var(--muted); margin-bottom: 18px; }
.crumbs a { color: var(--muted); }
.crumbs span { color: var(--text); }

/* a guide: sidebar, text, contents */
.doc { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 48px; align-items: start; }
.sidebar { position: sticky; top: 88px; max-height: calc(100vh - 110px); overflow: auto; padding-right: 8px; font-size: 15px; }
.sidebar-home { display: block; font-family: var(--display); font-weight: 700; color: var(--ink); text-decoration: none; margin-bottom: 14px; }
.sidebar h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 18px 0 6px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a { display: block; text-decoration: none; color: var(--text); padding: 5px 10px; border-left: 2px solid var(--line); }
.sidebar li a:hover { color: var(--ink); border-left-color: var(--line-2); }
.sidebar li a[aria-current] { color: var(--ink); border-left-color: var(--accent); background: var(--bg-2); }
.article { max-width: 780px; }
.article .lead { font-size: 19px; color: var(--text); }
.meta { font-size: 13px; color: var(--muted); }
.toc { border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; margin: 18px 0 28px; background: var(--bg-2); }
.toc h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-bottom: 6px; }
.toc ul { margin: 0; padding-left: 18px; }
.toc a { text-decoration: none; }

/* text written in the admin */
.prose { font-size: 17px; }
.prose h2 { font-size: 26px; margin: 40px 0 12px; padding-top: 8px; }
.prose h3 { font-size: 20px; margin: 28px 0 10px; }
.prose h4 { font-size: 17px; margin: 22px 0 8px; }
.prose ul, .prose ol { padding-left: 24px; margin: 0 0 1.2em; }
.prose li { margin: 4px 0; }
.prose ol { counter-reset: step; list-style: none; padding-left: 0; }
.prose ol > li { counter-increment: step; position: relative; padding-left: 44px; margin: 12px 0; }
.prose ol > li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--bg-3); border: 1px solid var(--line-2); color: var(--ink); font-size: 14px; font-weight: 600; display: grid; place-items: center; }
.prose img { display: block; border: 1px solid var(--line); border-radius: 10px; margin: 20px 0; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--bg-3); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; color: var(--ink); }
.prose pre { position: relative; background: #0b0c0e; border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; overflow-x: auto; margin: 0 0 1.4em; }
.prose pre code { background: none; border: 0; padding: 0; font-size: 14px; line-height: 1.6; }
.copy-code { position: absolute; top: 8px; right: 8px; background: var(--bg-3); color: var(--text); border: 1px solid var(--line-2); border-radius: 6px; font: 12px "IBM Plex Sans", sans-serif; padding: 3px 9px; cursor: pointer; }
.copy-code:hover { color: var(--ink); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.note { margin: 20px 0; padding: 14px 18px; border-radius: 10px; border: 1px solid var(--line); border-left: 4px solid var(--accent); background: var(--bg-2); }
.note p:last-child { margin-bottom: 0; }
.note-tip { border-left-color: var(--ok); }
.note-warning, .note-important { border-left-color: var(--warn); }
.note-note { border-left-color: var(--blue); }

/* questions */
.faq { border-top: 1px solid var(--line); margin-bottom: 32px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 16px 40px 16px 2px; position: relative; font-weight: 600; color: var(--ink); font-size: 17px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 8px; top: 12px; font-size: 24px; font-weight: 400; color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq .prose { padding: 0 2px 16px; font-size: 16px; }
.faq details:target summary, .faq details.hit summary { color: var(--accent-hover); }
#faq { scroll-margin-top: 90px; }

/* previous / next, still stuck */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 48px 0 32px; }
.pager a { display: block; text-decoration: none; border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; color: var(--ink); font-weight: 600; }
.pager a:hover { border-color: var(--accent); }
.pager a span { display: block; font-size: 13px; color: var(--muted); font-weight: 400; }
.pager .next { text-align: right; grid-column: 2; }
.help-cta { border: 1px solid var(--line); border-radius: 12px; padding: 24px 28px; margin-top: 48px; background: linear-gradient(135deg, var(--bg-2), var(--bg)); }
.help-cta h2 { font-family: var(--display); font-size: 22px; }
.btn { display: inline-block; text-decoration: none; background: var(--accent); color: #0b0c0e; font-weight: 600; padding: 10px 18px; border-radius: 8px; margin: 4px 8px 0 0; }
.btn:hover { background: var(--accent-hover); }
.btn-ghost { background: none; color: var(--ink); border: 1px solid var(--line-2); }
.btn-ghost:hover { background: var(--bg-3); }

/* search */
.results { margin-top: 28px; max-width: 780px; }
.result { display: block; text-decoration: none; padding: 16px 4px; border-bottom: 1px solid var(--line); }
.result:hover strong { text-decoration: underline; }
.result strong { color: var(--ink); font-size: 18px; display: block; }
.result .kind { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.result p { margin: 4px 0 0; color: var(--text); font-size: 15px; }
.result mark { background: rgba(170, 182, 194, .25); color: var(--ink); border-radius: 2px; }
.page-search .search-box, .page-notfound .search-box { margin: 0; }

/* footer */
.foot { border-top: 1px solid var(--line); background: #0d0f11; }
.foot-in { max-width: var(--wrap); margin: 0 auto; padding: 48px 24px 24px; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.foot p { color: var(--muted); font-size: 14px; max-width: 320px; margin-top: 12px; }
.foot h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-bottom: 10px; }
.foot-in a:not(.brand) { display: block; color: var(--text); text-decoration: none; font-size: 15px; padding: 3px 0; }
.foot-in a:not(.brand):hover { color: var(--ink); }
.copy { max-width: var(--wrap); margin: 0 auto; padding: 0 24px 32px; font-size: 13px; color: var(--muted); }

@media (max-width: 900px) {
  .doc { grid-template-columns: 1fr; gap: 24px; }
  .sidebar { position: static; max-height: none; border: 1px solid var(--line); border-radius: 10px; padding: 14px; order: 2; }
  .foot-in { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .topbar-in { gap: 12px; flex-wrap: wrap; height: auto; min-height: 60px; padding: 10px 16px; }
  .menu-toggle { display: block; }
  .site-nav { display: none; order: 5; flex-basis: 100%; flex-direction: column; padding-bottom: 8px; }
  .site-nav.open { display: flex; }
  .topbar-end { margin-left: 0; }
  .out { display: none; }
  main { padding: 28px 16px 64px; }
  .hero { padding: 32px 0; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
  .foot-in { grid-template-columns: 1fr; padding: 36px 16px 20px; }
  .copy { padding: 0 16px 28px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }