/* lugent — landing page + docs
   Every value here matches a node in lugent-landing-design.pen:
   sizes, gaps, paddings and colors are lifted from the design, not invented. */

:root{
  --bg:      #101010;
  --surface: #161613;
  --rule:    #2a2921;
  --ink:     #f2f2f2;
  --dim:     #a8a294;
  --muted:   #8a8478;
  --accent:  #00f5a0;
  --amber:   #ffcc66;
  --sky:     #06070a;   /* the night behind everything; not the page bg */

  --mono:"JetBrains Mono","Fira Code",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

body{
  font-family:var(--mono);
  /* the sky is a fixed layer under the page; body bg stays transparent so the
     stars show through everywhere that is not an opaque surface */
  background:var(--sky);
  color:var(--dim);
  font-size:15px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

/* starfield — behind every opaque surface, frozen when motion is reduced */
#stars{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:-1;
  pointer-events:none;
  display:block;
}

/* a very soft vignette so the sky does not read as flat black */
#stars::after{content:""}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:radial-gradient(ellipse 120% 80% at 50% -10%, rgba(0,245,160,0.045), transparent 62%);
}

::selection{background:var(--amber);color:var(--bg)}
a{color:var(--amber);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:.2em}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
code{font-family:var(--mono);font-size:.92em;color:var(--ink)}

/* header — h=72, px=64, justify-between, items-center, bottom rule */
.hdr{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;padding:0 64px;
  border-bottom:1px solid var(--rule);
  /* translucent over the starfield: the stars drift behind the chrome */
  background:rgba(6,7,10,0.72);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.brand{display:flex;align-items:center;gap:12px}
.mark{
  display:flex;align-items:center;justify-content:center;
  width:32px;height:32px;background:var(--surface);border-radius:6px;flex:none;
}
.mark svg{display:block;width:32px;height:32px}
.wordmark{font-size:19px;font-weight:700;color:var(--ink);letter-spacing:-.01em}
a.wordmark:hover{text-decoration:none;color:var(--accent)}
.chip{
  display:inline-flex;align-items:center;
  padding:4px 8px;background:var(--surface);border-radius:4px;
  font-size:12px;color:var(--dim);white-space:nowrap;
}
.nav{display:flex;align-items:center;gap:32px;font-size:13px}
.nav a{color:var(--dim)}
.nav a:hover{color:var(--ink);text-decoration:none}
.nav a[aria-current="page"]{color:var(--amber)}
.menu-btn{
  display:none;width:32px;height:32px;
  align-items:center;justify-content:center;
  background:var(--surface);border:1px solid var(--rule);border-radius:4px;
  color:var(--dim);font:inherit;font-size:14px;cursor:pointer;
}

/* hero — py=128, px=64, gap=48 */
.hero{display:flex;flex-direction:column;gap:48px;padding:128px 64px}
.hero-text{display:flex;flex-direction:column;gap:24px;max-width:860px}
.eyebrow{font-size:12px;font-weight:700;color:var(--accent);letter-spacing:.08em}
h1{
  font-size:64px;line-height:1.1;font-weight:700;color:var(--ink);
  letter-spacing:-.03em;text-wrap:balance;
}
.hero-sub{font-size:17px;color:var(--dim);max-width:70ch}

/* install — w=640, gap=16 */
.install{display:flex;flex-direction:column;gap:16px;max-width:640px}
.install-label{font-size:12px;font-weight:700;color:var(--dim);letter-spacing:.08em}
.cmd{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 20px;background:var(--surface);
  border:1px solid var(--rule);border-radius:6px;
}
.cmd code{
  font-size:15px;color:var(--accent);white-space:nowrap;
  overflow-x:auto;scrollbar-width:none;
}
.cmd code::-webkit-scrollbar{display:none}
.copy{
  display:inline-flex;align-items:center;justify-content:center;
  width:64px;height:44px;flex:none;
  background:var(--bg);border:1px solid transparent;border-radius:4px;
  color:var(--dim);font:inherit;font-size:12px;cursor:pointer;
}
.copy:hover{border-color:var(--rule);color:var(--ink)}
.copy[data-copied="true"]{color:var(--accent)}
.install-note{font-size:12px;color:var(--dim)}

/* cta row — gap=16 */
.ctas{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:16px 28px;border-radius:4px;
  font-family:var(--mono);font-size:13px;font-weight:700;
  cursor:pointer;border:1px solid transparent;
  transition:filter .12s ease,background .12s ease;
}
.btn-primary{background:var(--amber);color:var(--bg)}
.btn-primary:hover{filter:brightness(1.08);text-decoration:none}
.btn-ghost{color:var(--ink);border-color:var(--rule)}
.btn-ghost:hover{background:var(--surface);text-decoration:none}

/* features — py=96, px=64, gap=40 */
.features{display:flex;flex-direction:column;gap:40px;padding:96px 64px}
.feat-head{display:flex;flex-direction:column;gap:12px;max-width:640px}
.feat-title{
  font-size:32px;line-height:1.2;font-weight:700;color:var(--ink);
  letter-spacing:-.02em;text-wrap:balance;
}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.card{
  display:flex;flex-direction:column;gap:12px;padding:24px;
  background:var(--surface);border:1px solid var(--rule);border-radius:8px;
}
.card h2,.card h3{font-size:15px;font-weight:700;color:var(--ink)}
.card p{font-size:13px;color:var(--dim)}

/* footer — py=32, px=64 */
.ftr{
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;flex-wrap:wrap;
  padding:32px 64px;border-top:1px solid var(--rule);font-size:12px;
  background:rgba(6,7,10,0.72);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.ftr-links{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.ftr a{color:var(--dim)}
.ftr a:hover{color:var(--ink)}

/* docs — sidebar w=260 py=40 px=28; main py=56 px=72 gap=36 */
.docs{display:flex;align-items:flex-start}
.side{
  width:260px;flex:none;
  display:flex;flex-direction:column;gap:32px;
  padding:40px 28px;
  border-right:1px solid var(--rule);
  position:sticky;top:0;max-height:100vh;overflow-y:auto;
  scrollbar-width:thin;
}
.side-body{display:flex;flex-direction:column;gap:32px}
.side-group{display:flex;flex-direction:column;gap:8px}
.side-label{font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.08em}
.side a{display:block;padding:8px 12px;border-radius:4px;font-size:13px;color:var(--dim)}
.side a:hover{background:var(--surface);color:var(--ink);text-decoration:none}
.side a[aria-current="page"]{background:var(--surface);color:var(--accent)}
.side-install{font-size:12px;color:var(--accent);white-space:nowrap}
.side-toggle{display:none}

.main{
  flex:1;min-width:0;
  display:flex;flex-direction:column;gap:36px;
  padding:56px 72px;
}

.crumbs{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--dim)}
.crumbs span[aria-current]{color:var(--dim)}

.doc-head{display:flex;flex-direction:column;gap:12px;max-width:720px}
h1.doc{font-size:36px;line-height:1.2}
.doc-head p{font-size:15px;color:var(--dim)}

.sec{display:flex;flex-direction:column;gap:16px;max-width:720px}
.sec h2{font-size:19px;font-weight:700;color:var(--ink);letter-spacing:-.01em}
.sec p{font-size:14px;color:var(--dim)}
.sec ul{display:flex;flex-direction:column;gap:8px;padding-left:20px;font-size:14px}
.sec li::marker{color:var(--muted)}

/* code block — py=16 px=20, radius 6 */
pre{
  padding:16px 20px;background:var(--surface);
  border:1px solid var(--rule);border-radius:6px;
  font-family:var(--mono);font-size:12px;line-height:1.7;
  color:var(--dim);overflow-x:auto;white-space:pre;
}
pre .c{color:var(--accent)}
pre .k{color:var(--amber)}
pre .m{color:var(--muted)}

/* table — rows py=12 px=16 */
.table{
  display:flex;flex-direction:column;
  border:1px solid var(--rule);border-radius:6px;overflow:hidden;
}
.row{
  display:grid;grid-template-columns:140px 1fr;gap:16px;
  padding:12px 16px;font-size:12px;border-bottom:1px solid var(--rule);
}
.row:last-child{border-bottom:0}
.row dt{color:var(--amber);font-weight:700}
.row dd{color:var(--dim);min-width:0;overflow-wrap:anywhere}

/* callout — row, gap=16, py=16 px=20, 2px amber bar */
.callout{
  display:flex;gap:16px;
  padding:16px 20px;background:var(--surface);
  border:1px solid var(--rule);border-radius:6px;
  font-size:13px;color:var(--dim);max-width:720px;
}
.callout::before{content:"";flex:none;width:2px;background:var(--amber);border-radius:9999px}
.callout strong{color:var(--ink);font-weight:700}

/* pager — row, gap=16, pt=32, top rule */
.pager{display:flex;gap:16px;padding-top:32px;border-top:1px solid var(--rule)}
.pager a{
  display:flex;flex-direction:column;gap:8px;
  flex:1;min-width:0;padding:16px 20px;
  background:var(--surface);border-radius:6px;font-size:13px;
}
.pager a:hover{background:#1c1c18;text-decoration:none}
.pager a span{font-size:12px;color:var(--muted)}
.pager a strong{font-weight:400;color:var(--amber)}
.pager .next{text-align:right;align-items:flex-end}

/* responsive — 900px; values from the 390px mobile frame */
@media (max-width:900px){
  .hdr{height:64px;padding:0 20px}
  .nav{
    display:none;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    padding:8px 20px 16px;background:var(--sky);
    border-bottom:1px solid var(--rule);z-index:10;
  }
  .nav[data-open="true"]{display:flex}
  .nav a{padding:12px 0;font-size:15px}
  .menu-btn{display:inline-flex}

  .hero{padding:48px 20px;gap:28px}
  h1{font-size:34px}
  .hero-sub{font-size:15px}
  .install{max-width:none}
  .cmd{padding:16px}
  .ctas{flex-direction:column;align-items:stretch}
  .btn{width:100%}

  .features{padding:32px 20px;gap:16px}
  .feat-title{font-size:22px}
  .grid{grid-template-columns:1fr}
  .card{padding:16px;gap:8px}

  .ftr{padding:24px 20px}

  .docs{display:block}
  .side{
    width:auto;position:static;max-height:none;
    padding:16px 20px;border-right:0;border-bottom:1px solid var(--rule);
  }
  .side-toggle{
    display:flex;align-items:center;justify-content:space-between;
    width:100%;padding:12px 0;background:none;border:0;
    color:var(--ink);font:inherit;font-size:13px;font-weight:700;cursor:pointer;
  }
  .side-toggle::after{content:"▾";color:var(--muted)}
  .side[data-open="false"] .side-body{display:none}

  .main{padding:32px 20px;gap:28px}
  h1.doc{font-size:28px}
  .row{grid-template-columns:1fr;gap:4px}
  .pager{flex-direction:column}
  pre{font-size:11px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important}
  /* the starfield freezes to a single static frame (stars.js stops the loop) */
  #stars{animation:none !important}
}