/* SkyVision GNU/Linux — longervision.us
   Palette: high-altitude sky paper, penguin-navy ink, Tux-feet orange, belly cream */
:root{
  --paper:#F3F8FC;
  --paper-2:#E7F0F8;
  --ink:#0D1B2A;
  --ink-soft:#3D5166;
  --navy:#10283F;
  --navy-2:#0B1E31;
  --sky:#3D8FD1;
  --sky-deep:#1B5E96;
  --feet:#F2A33C;
  --feet-deep:#D9831F;
  --cream:#FAF4E6;
  --line:#C9DAE8;
  --ok:#3FA66A;
  --radius:10px;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:'IBM Plex Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --disp:'Space Grotesk',var(--sans);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
body{
  font-family:var(--sans);color:var(--ink);background:var(--paper);
  font-size:16.5px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--sky-deep);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--feet);outline-offset:2px;border-radius:3px}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ── top bar ── */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(243,248,252,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.topbar .wrap{display:flex;align-items:center;gap:28px;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--disp);font-weight:700;font-size:1.12rem;color:var(--ink);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand img{width:34px;height:41px;object-fit:contain}
.brand small{display:block;font:500 .62rem/1 var(--mono);color:var(--ink-soft);letter-spacing:.14em;text-transform:uppercase;margin-top:2px}
.nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav a{font:500 .93rem var(--sans);color:var(--ink-soft);padding:8px 13px;border-radius:7px}
.nav a:hover{color:var(--ink);background:var(--paper-2);text-decoration:none}
.nav a[aria-current="page"]{color:var(--ink);font-weight:600;background:var(--paper-2)}
.nav .forum-link{margin-left:6px;border:1.5px solid var(--ink);color:var(--ink);font-weight:600}
.nav .forum-link:hover{background:var(--ink);color:#fff}
.nav-toggle{display:none;margin-left:auto;background:none;border:1.5px solid var(--line);border-radius:7px;padding:7px 11px;font:600 .9rem var(--mono);color:var(--ink);cursor:pointer}
@media(max-width:880px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;top:66px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 18px 16px;gap:2px}
  .nav.open{display:flex}
  .nav a{padding:11px 12px}
  .nav .forum-link{margin:8px 0 0;text-align:center}
}

/* ── man-page style section eyebrows ── */
.eyebrow{
  font:600 .75rem var(--mono);letter-spacing:.22em;text-transform:uppercase;
  color:var(--feet-deep);display:flex;align-items:center;gap:14px;margin-bottom:14px;
}
.eyebrow::after{content:"";flex:1;height:1px;background:var(--line)}

h1,h2,h3{font-family:var(--disp);letter-spacing:-.02em;line-height:1.15}
h2{font-size:clamp(1.5rem,3vw,2.05rem);margin-bottom:14px}
h3{font-size:1.13rem;margin-bottom:8px}
.section{padding:72px 0}
.section.alt{background:var(--paper-2)}
.lede{font-size:1.08rem;color:var(--ink-soft);max-width:62ch}

/* ── buttons ── */
.btn{display:inline-flex;align-items:center;gap:9px;font:600 .97rem var(--sans);padding:13px 22px;border-radius:var(--radius);border:1.5px solid transparent;cursor:pointer;transition:transform .12s,box-shadow .12s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--feet);color:var(--navy-2);box-shadow:0 2px 0 var(--feet-deep)}
.btn-primary:hover{box-shadow:0 3px 0 var(--feet-deep)}
.btn-ghost{border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-sky{background:var(--sky-deep);color:#fff;box-shadow:0 2px 0 #123F63}

/* ── hero ── */
.hero{padding:64px 0 76px;background:
  radial-gradient(900px 420px at 85% -10%,rgba(61,143,209,.16),transparent 65%),
  radial-gradient(700px 360px at -10% 110%,rgba(242,163,60,.12),transparent 60%);}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}
.hero h1{font-size:clamp(2.1rem,4.6vw,3.3rem);margin:14px 0 18px}
.hero h1 em{font-style:normal;color:var(--sky-deep)}
.release-tag{display:inline-flex;align-items:center;gap:8px;font:500 .8rem var(--mono);background:#fff;border:1px solid var(--line);border-radius:99px;padding:6px 14px;color:var(--ink-soft)}
.release-tag b{color:var(--feet-deep)}
.hero-actions{display:flex;gap:13px;flex-wrap:wrap;margin-top:26px}
.hero-meta{margin-top:18px;font:.8rem var(--mono);color:var(--ink-soft)}
.hero-logo{display:flex;align-items:flex-end;gap:18px;margin-bottom:6px}
.hero-logo img{width:86px;filter:drop-shadow(0 6px 14px rgba(13,27,42,.18))}
@media(max-width:920px){.hero .wrap{grid-template-columns:1fr;gap:40px}}

/* ── terminal window (signature) ── */
.term{
  background:var(--navy-2);border-radius:14px;overflow:hidden;
  box-shadow:0 22px 50px -18px rgba(13,27,42,.45),0 0 0 1px rgba(255,255,255,.06) inset;
  font:.8rem/1.7 var(--mono);
}
.term-bar{display:flex;align-items:center;gap:8px;background:var(--navy);padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.07)}
.term-bar .dot{width:11px;height:11px;border-radius:50%}
.term-bar .dot:nth-child(1){background:#E5604F}.term-bar .dot:nth-child(2){background:var(--feet)}.term-bar .dot:nth-child(3){background:var(--ok)}
.term-bar span{margin-left:8px;color:#7E93A8;font-size:.72rem}
.term-body{padding:18px 20px 22px;min-height:300px;color:#C9D8E6}
.term-body .ok{color:var(--ok)}
.term-body .accent{color:var(--feet)}
.term-body .skyc{color:#6FB3E8}
.term-body .dim{color:#64798E}
.term-body .cursor{display:inline-block;width:8px;height:15px;background:#C9D8E6;vertical-align:-2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

/* ── code blocks ── */
pre.code{
  background:var(--navy-2);color:#C9D8E6;border-radius:var(--radius);
  padding:18px 20px;font:.84rem/1.75 var(--mono);overflow-x:auto;
  box-shadow:0 0 0 1px rgba(255,255,255,.06) inset;
}
pre.code .c{color:#64798E}pre.code .p{color:var(--feet)}pre.code .s{color:#8CC6F2}
code.inline{font:.86em var(--mono);background:var(--paper-2);border:1px solid var(--line);border-radius:5px;padding:1px 6px}

/* ── cards / grids ── */
.grid{display:grid;gap:18px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
@media(max-width:880px){.grid.c3{grid-template-columns:1fr}.grid.c2{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.card h3{display:flex;align-items:center;gap:10px}
.card p{color:var(--ink-soft);font-size:.95rem;margin-top:6px}
.glyph{font:700 .95rem var(--mono);color:var(--feet-deep);background:var(--cream);border:1px solid #EAD9B8;border-radius:7px;padding:3px 8px}

/* ── tables ── */
table.spec{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:.93rem}
table.spec th,table.spec td{padding:11px 16px;text-align:left;border-bottom:1px solid var(--line)}
table.spec th{font:600 .74rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);background:var(--paper-2)}
table.spec tr:last-child td{border-bottom:none}
table.spec td:first-child{font-family:var(--mono);font-size:.85rem}

/* ── news list ── */
.news{display:flex;flex-direction:column;gap:0;border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden}
.news a{display:grid;grid-template-columns:130px 1fr auto;gap:18px;align-items:baseline;padding:16px 22px;border-bottom:1px solid var(--line);color:var(--ink)}
.news a:last-child{border-bottom:none}
.news a:hover{background:var(--paper-2);text-decoration:none}
.news time{font:.78rem var(--mono);color:var(--ink-soft)}
.news .arr{color:var(--feet-deep);font-family:var(--mono)}
@media(max-width:680px){.news a{grid-template-columns:1fr;gap:4px}}

/* ── download cards ── */
.iso{background:#fff;border:1.5px solid var(--line);border-radius:14px;padding:28px;position:relative}
.iso.featured{border-color:var(--feet)}
.iso .flag{position:absolute;top:-12px;left:24px;font:600 .68rem var(--mono);letter-spacing:.14em;text-transform:uppercase;background:var(--feet);color:var(--navy-2);border-radius:99px;padding:4px 12px}
.iso h3{font-size:1.3rem}
.iso .size{font:.8rem var(--mono);color:var(--ink-soft)}
.iso ul{list-style:none;margin:14px 0 20px;display:flex;flex-direction:column;gap:7px;font-size:.93rem;color:var(--ink-soft)}
.iso ul li::before{content:"▸ ";color:var(--feet-deep);font-family:var(--mono)}
.iso .sum{font:.7rem var(--mono);color:var(--ink-soft);word-break:break-all;background:var(--paper-2);border-radius:7px;padding:9px 12px;margin-top:14px}
.iso .links{display:flex;gap:10px;flex-wrap:wrap}

/* ── docs layout ── */
.docs-layout{display:grid;grid-template-columns:280px 1fr;gap:44px;align-items:start}
@media(max-width:920px){.docs-layout{grid-template-columns:1fr}}
.toc{position:sticky;top:86px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 0;font-size:.9rem;max-height:calc(100vh - 110px);overflow:auto}
.toc h3{font:600 .72rem var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);padding:0 20px 8px}
.toc .part{font:600 .73rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--feet-deep);padding:14px 20px 4px}
.toc a{display:block;color:var(--ink-soft);padding:5px 20px;border-left:3px solid transparent}
.toc a:hover{color:var(--ink);background:var(--paper-2);text-decoration:none}
.toc a.now{color:var(--ink);font-weight:600;border-left-color:var(--feet)}
.bookpage{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:40px 44px}
.bookpage h2{margin-top:0}
.bookpage h3{margin-top:30px}
.bookpage p{margin:12px 0;color:#22364B}
.bookpage .pathline{font:.78rem var(--mono);color:var(--ink-soft);border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:20px}
.bookpage .note{border-left:3px solid var(--sky);background:var(--paper-2);border-radius:0 8px 8px 0;padding:13px 18px;font-size:.92rem;margin:16px 0}
.bookpage pre.code{margin:14px 0}
@media(max-width:680px){.bookpage{padding:26px 22px}}

/* ── community ── */
.chan{display:flex;gap:16px;align-items:flex-start}
.chan .glyph{flex-shrink:0;margin-top:3px}
.cat-list{list-style:none;margin-top:12px;display:flex;flex-direction:column;gap:8px;font-size:.92rem}
.cat-list li{display:flex;gap:10px;align-items:baseline}
.cat-list .swatch{width:10px;height:10px;border-radius:3px;flex-shrink:0;transform:translateY(1px)}

/* ── about ── */
.story{display:grid;grid-template-columns:300px 1fr;gap:48px;align-items:center}
@media(max-width:880px){.story{grid-template-columns:1fr}}
.story img{width:240px;margin:0 auto;filter:drop-shadow(0 14px 28px rgba(13,27,42,.22))}
.roadmap{list-style:none;display:flex;flex-direction:column;gap:0;border-left:2px solid var(--line);margin-left:8px}
.roadmap li{padding:0 0 26px 26px;position:relative}
.roadmap li::before{content:"";position:absolute;left:-8px;top:5px;width:14px;height:14px;border-radius:50%;background:var(--paper);border:3px solid var(--sky-deep)}
.roadmap li.done::before{background:var(--feet);border-color:var(--feet-deep)}
.roadmap b{font-family:var(--disp)}
.roadmap span{display:block;font:.78rem var(--mono);color:var(--ink-soft)}

/* ── CTA band ── */
.band{background:var(--navy-2);color:#DCE8F2;border-radius:18px;padding:46px 48px;display:flex;align-items:center;gap:36px;justify-content:space-between;flex-wrap:wrap;
  background-image:radial-gradient(500px 220px at 90% -30%,rgba(61,143,209,.35),transparent 60%)}
.band h2{color:#fff;margin-bottom:6px}
.band p{color:#9FB4C8;max-width:50ch}

/* ── footer ── */
footer{background:var(--navy-2);color:#9FB4C8;margin-top:80px;font-size:.9rem}
footer .wrap{padding:54px 24px 30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.1)}
@media(max-width:880px){.foot-grid{grid-template-columns:1fr 1fr}}
footer h4{font:600 .72rem var(--mono);letter-spacing:.16em;text-transform:uppercase;color:#fff;margin-bottom:14px}
footer a{color:#9FB4C8;display:block;padding:3px 0}
footer a:hover{color:#fff}
.foot-brand{display:flex;gap:14px;align-items:flex-start}
.foot-brand img{width:42px}
.foot-brand b{color:#fff;font-family:var(--disp)}
.foot-bottom{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;padding-top:24px;font:.76rem var(--mono);color:#64798E}

/* ── doc subpages ── */
.crumb{font:.78rem var(--mono);color:var(--ink-soft);margin-bottom:10px}
.crumb a{color:var(--ink-soft)}
.crumb a:hover{color:var(--ink)}
details.chap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
details.chap summary{cursor:pointer;padding:15px 20px;font:600 .98rem var(--disp);display:flex;gap:12px;align-items:baseline;list-style:none}
details.chap summary::-webkit-details-marker{display:none}
details.chap summary .no{font:600 .78rem var(--mono);color:var(--feet-deep);min-width:2.2em}
details.chap summary::after{content:"+";margin-left:auto;font-family:var(--mono);color:var(--ink-soft)}
details.chap[open] summary::after{content:"–"}
details.chap[open] summary{border-bottom:1px solid var(--line)}
details.chap .chap-body{padding:16px 20px 18px;font-size:.93rem;color:var(--ink-soft)}
details.chap .chap-body ol{margin:10px 0 4px 20px;display:flex;flex-direction:column;gap:5px}
.qa{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin-bottom:14px}
.qa h3{color:var(--sky-deep)}
.relnote{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 34px;margin-bottom:22px}
.relnote h2{display:flex;gap:14px;align-items:baseline;flex-wrap:wrap}
.relnote .when{font:.78rem var(--mono);color:var(--ink-soft)}
.relnote ul{margin:10px 0 10px 20px;display:flex;flex-direction:column;gap:6px;font-size:.95rem;color:#22364B}
.cmdrow td:first-child{white-space:nowrap;color:var(--sky-deep)}