@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');
*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#04070a; --panel:rgba(8,14,10,.72); --panel2:rgba(11,18,13,.9);
  --green:#39e07a; --green-bright:#5fff95; --green-soft:#a8ffc4; --green-dim:#2f7d49;
  --green-faint:#1a3b27; --amber:#ffd25e; --amber-dim:#b78a33;
  --grid-fine:rgba(74,255,138,.045); --grid-major:rgba(74,255,138,.085);
  --border:rgba(90,255,150,.24); --border-soft:rgba(90,255,150,.12);
  --glow:0 0 6px rgba(60,255,122,.4); --glow-soft:0 0 4px rgba(60,255,122,.25);
}
html{scroll-behavior:smooth}
body{
  margin:0; background-color:var(--bg); color:var(--green-soft);
  font-family:"IBM Plex Mono",ui-monospace,monospace; font-size:14px; line-height:1.55;
  -webkit-font-smoothing:antialiased;
  background-image:
    linear-gradient(var(--grid-fine) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-fine) 1px,transparent 1px),
    linear-gradient(var(--grid-major) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-major) 1px,transparent 1px);
  background-size:24px 24px,24px 24px,120px 120px,120px 120px;
  background-attachment:fixed;
}
/* CRT overlay: scanlines + vignette + faint flicker */
.crt{position:fixed;inset:0;pointer-events:none;z-index:60}
.crt::before{content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,0) 0,rgba(0,0,0,0) 2px,rgba(0,0,0,.16) 3px,rgba(0,0,0,0) 4px);
  animation:flicker 6s infinite steps(60)}
.crt::after{content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse 120% 100% at 50% 50%,transparent 55%,rgba(0,0,0,.5) 100%)}
@keyframes flicker{0%,100%{opacity:.92}48%{opacity:.97}50%{opacity:.88}52%{opacity:.96}}
@media (prefers-reduced-motion:reduce){.crt::before{animation:none}}

a{color:inherit;text-decoration:none}
::selection{background:rgba(95,255,149,.28);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:rgba(0,0,0,.3)}
::-webkit-scrollbar-thumb{background:var(--green-faint);border:1px solid var(--border-soft)}
::-webkit-scrollbar-thumb:hover{background:var(--green-dim)}

/* Home page: hide the document scrollbar chrome beside the ASCII header.
   Scrolling stays fully functional (wheel, trackpad, keyboard, touch);
   only the visible scrollbar is suppressed, and only on the home view. */
html.home-view{scrollbar-width:none}                 /* Firefox */
html.home-view::-webkit-scrollbar{width:0;height:0}  /* Chrome, Safari, Edge */

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:18px;
  height:52px;padding:0 20px;border-bottom:1px solid var(--border-soft);
  background:rgba(4,7,10,.82);backdrop-filter:blur(4px)}
.brand{font-weight:700;font-size:13px;letter-spacing:.04em;color:var(--green-bright);
  text-shadow:var(--glow);white-space:nowrap;cursor:pointer;flex:0 0 auto}
.brand b{color:var(--green-dim);font-weight:400}
.searchwrap{position:relative;flex:1;min-width:0;max-width:520px;margin:0 auto}
.search{width:100%;background:rgba(8,14,10,.8);border:1px solid var(--border-soft);
  color:var(--green-soft);font-family:inherit;font-size:12.5px;padding:7px 12px 7px 28px;outline:none}
.search:focus{border-color:var(--border);box-shadow:var(--glow-soft)}
.searchwrap::before{content:">";position:absolute;left:11px;top:50%;transform:translateY(-50%);
  color:var(--green-dim);font-size:12px}
.results{position:absolute;top:40px;left:0;right:0;background:var(--panel2);
  border:1px solid var(--border);backdrop-filter:blur(6px);max-height:60vh;overflow:auto;
  z-index:50;display:none;box-shadow:0 18px 40px -16px rgba(0,0,0,.8)}
.results.open{display:block}
.res{display:block;padding:9px 14px;border-bottom:1px solid var(--border-soft);cursor:pointer}
.res:hover{background:rgba(60,255,122,.08)}
.res .rc{font-size:10px;letter-spacing:.12em;color:var(--green-dim);text-transform:uppercase}
.res .rl{font-size:12.5px;color:var(--green-soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.res .rl .mk{background:var(--amber);color:#06120a;padding:0 1px}
.res .rempty{padding:14px;color:var(--green-dim);font-size:12px}
.status{display:flex;align-items:center;gap:8px;flex:0 0 auto;font-size:11px;color:var(--green-dim);
  letter-spacing:.08em;white-space:nowrap}
.dot{width:7px;height:7px;border-radius:50%;background:var(--green-bright);box-shadow:0 0 8px var(--green-bright);
  animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.clock{color:var(--green-dim)}

/* ---------- background music player ---------- */
.player{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.player audio{display:none}
.mp-now{display:flex;align-items:center;gap:8px;max-width:210px;overflow:hidden}
.eq{display:inline-flex;align-items:flex-end;gap:2px;height:14px;width:18px;flex:0 0 auto}
.eq i{display:block;width:3px;height:28%;border-radius:1px;background:var(--green-dim);transition:height .2s,background .2s}
.mp-now[data-state="playing"] .eq i{background:var(--green-bright);box-shadow:0 0 5px var(--green-bright);
  animation:eq .9s ease-in-out infinite}
.mp-now[data-state="playing"] .eq i:nth-child(1){animation-delay:0s}
.mp-now[data-state="playing"] .eq i:nth-child(2){animation-delay:.25s}
.mp-now[data-state="playing"] .eq i:nth-child(3){animation-delay:.45s}
.mp-now[data-state="playing"] .eq i:nth-child(4){animation-delay:.12s}
@keyframes eq{0%,100%{height:22%}50%{height:100%}}
@media (prefers-reduced-motion:reduce){.mp-now[data-state="playing"] .eq i{animation:none;height:70%}}
.mp-info{display:flex;flex-direction:column;line-height:1.12;min-width:0}
.mp-lab{font-size:8px;letter-spacing:.18em;color:var(--green-faint);text-transform:uppercase}
.mp-now[data-state="playing"] .mp-lab{color:var(--green-dim)}
.mp-track{display:block;max-width:100%;font-size:10.5px;letter-spacing:.06em;color:var(--green-soft);
  overflow:hidden;white-space:nowrap;position:relative}
/* marquee: two identical segments; translating the pair by -50% loops seamlessly */
.mp-scroll{display:inline-flex;flex-wrap:nowrap;width:max-content;will-change:transform}
.mp-seg{flex:0 0 auto;white-space:nowrap;padding-right:2.5em}
.mp-track.scrolling .mp-scroll{animation:mp-marquee var(--mp-scroll-dur,14s) linear infinite}
@keyframes mp-marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.mp-now[data-state="paused"] .mp-track.scrolling .mp-scroll{animation-play-state:paused}
@media (prefers-reduced-motion:reduce){
  .mp-track.scrolling .mp-scroll{animation:none}
  .mp-track.scrolling{text-overflow:ellipsis}
}
.mp-btn{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:28px;
  padding:0 8px;background:transparent;border:1px solid var(--border-soft);color:var(--green);
  font-family:inherit;font-size:12px;font-weight:700;line-height:1;letter-spacing:1px;cursor:pointer;transition:.14s}
.mp-btn:hover{border-color:var(--border);background:rgba(60,255,122,.1);color:var(--green-bright);box-shadow:var(--glow-soft)}
.mp-btn:active{transform:translateY(1px)}
.mp-btn.playing{color:var(--green-bright);border-color:var(--border);text-shadow:var(--glow);
  background:rgba(60,255,122,.08)}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:250px 1fr;align-items:start}
.side{position:sticky;top:52px;height:calc(100vh - 52px);overflow:auto;
  border-right:1px solid var(--border-soft);padding:20px 14px;background:rgba(5,9,7,.4)}
.nav-grp{margin-bottom:8px}
.nav-cat{display:flex;align-items:center;gap:9px;padding:8px 9px;color:var(--green-soft);
  font-weight:600;font-size:12.5px;border:1px solid transparent;transition:.14s}
.nav-cat:hover{background:rgba(60,255,122,.07);color:var(--green-bright)}
.nav-cat.on{color:var(--green-bright);text-shadow:var(--glow-soft)}
.nav-cat .tag{font-size:9px;letter-spacing:.06em;color:#06120a;background:var(--green-dim);
  padding:2px 5px;flex:0 0 auto;font-weight:700}
.nav-cat.on .tag{background:var(--green-bright)}
.nav-sub{padding:2px 0 8px 6px}
.nav-sub a{display:block;padding:5px 9px 5px 0;color:var(--green-dim);font-size:12px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:.12s}
.nav-sub a::before{content:"+- ";color:var(--green-faint)}
.nav-sub a:hover{color:var(--green-bright)}
.nav-sub a.on{color:var(--green-bright);text-shadow:var(--glow-soft)}
.nav-sub a.on::before{content:"+> ";color:var(--green)}
.side-foot{margin-top:18px;padding-top:14px;border-top:1px solid var(--border-soft);
  font-size:10px;line-height:1.7;color:var(--green-faint);letter-spacing:.04em}

/* ---------- main ---------- */
.main{padding:26px 32px 70px;max-width:1180px;min-height:calc(100vh - 52px)}
.ascii{color:var(--green-bright);text-shadow:var(--glow);font-size:11px;line-height:1.12;
  white-space:pre;overflow-x:auto;margin:0 0 6px}
.crumbs{font-size:10.5px;letter-spacing:.14em;color:var(--green-dim);text-transform:uppercase;margin:0 0 22px}
.crumbs a:hover{color:var(--green-bright)}
.crumbs .sep{color:var(--green-faint);margin:0 7px}

/* hero (home) */
.hero{margin-bottom:30px}
.hero pre{color:var(--green-bright);text-shadow:var(--glow);font-size:clamp(9px,2.1vw,15px);
  line-height:1.05;white-space:pre;overflow-x:hidden;margin:0 0 18px}
.hero .lead{max-width:660px;color:var(--green-soft);font-size:14px;margin:0 0 6px}
.hero .lead b{color:var(--green-bright)}
.hero .meta{color:var(--green-dim);font-size:11.5px;letter-spacing:.04em;margin-top:14px}
.cur{display:inline-block;width:8px;height:1em;background:var(--green-bright);
  vertical-align:-2px;margin-left:2px;animation:blink 1.1s steps(1) infinite;box-shadow:var(--glow)}
@keyframes blink{50%{opacity:0}}

/* cards grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:14px;margin-top:8px}
.card{position:relative;display:block;border:1px solid var(--border-soft);background:var(--panel);
  padding:17px 16px 14px;transition:.16s;overflow:hidden}
.card::before,.card::after{content:"";position:absolute;width:11px;height:11px;opacity:.7;transition:.16s}
.card::before{top:-1px;left:-1px;border-top:2px solid var(--green);border-left:2px solid var(--green)}
.card::after{bottom:-1px;right:-1px;border-bottom:2px solid var(--green);border-right:2px solid var(--green)}
.card:hover{border-color:var(--border);background:var(--panel2);transform:translateY(-3px);
  box-shadow:0 16px 30px -18px rgba(60,255,122,.4)}
.card:hover::before,.card:hover::after{opacity:1;width:15px;height:15px;box-shadow:var(--glow-soft)}
.card .ct{display:flex;align-items:center;gap:9px;margin-bottom:8px}
.card .tag{font-size:9px;color:#06120a;background:var(--green-dim);padding:2px 6px;font-weight:700;letter-spacing:.05em}
.card:hover .tag{background:var(--green-bright)}
.card h3{margin:0;font-size:15px;font-weight:600;color:var(--green-bright)}
.card p{margin:0 0 12px;font-size:12px;color:var(--green-dim);line-height:1.5}
.card .enter{font-size:11px;color:var(--green);letter-spacing:.06em}
.card .enter::after{content:" >";color:var(--green-dim)}
.card .pages{font-size:10.5px;color:var(--green-faint);margin-top:2px}

/* terminal panel (doc view) */
.term{position:relative;border:1px solid var(--border);background:var(--panel);margin-top:4px}
.term::before,.term::after{content:"";position:absolute;width:13px;height:13px;z-index:2}
.term::before{top:-1px;left:-1px;border-top:2px solid var(--green);border-left:2px solid var(--green);box-shadow:var(--glow-soft)}
.term::after{bottom:-1px;right:-1px;border-bottom:2px solid var(--green);border-right:2px solid var(--green);box-shadow:var(--glow-soft)}
.term-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:8px 14px;border-bottom:1px solid var(--border-soft);background:var(--panel2)}
.term-bar .fn{font-size:11px;color:var(--green);letter-spacing:.04em;display:flex;align-items:center;gap:8px}
.term-bar .fn .lt{color:var(--green-faint)}
.term-acts{display:flex;gap:8px}
.btn{background:transparent;border:1px solid var(--border-soft);color:var(--green);
  font-family:inherit;font-size:10.5px;letter-spacing:.08em;padding:4px 11px;cursor:pointer;transition:.14s}
.btn:hover{border-color:var(--border);background:rgba(60,255,122,.1);color:var(--green-bright);box-shadow:var(--glow-soft)}
.btn.ok{background:var(--green-bright);color:#06120a;border-color:var(--green-bright)}
.toc{display:flex;flex-wrap:wrap;gap:6px;padding:11px 14px;border-bottom:1px solid var(--border-soft);background:rgba(5,9,7,.5)}
.toc .tl{font-size:10px;color:var(--green-dim);letter-spacing:.12em;align-self:center;margin-right:4px}
.toc a{font-size:10.5px;color:var(--green-dim);border:1px solid var(--border-soft);padding:3px 9px;transition:.12s}
.toc a:hover{color:var(--green-bright);border-color:var(--border);background:rgba(60,255,122,.08)}
.doc{padding:16px 18px;overflow-x:auto;font-size:12.5px;line-height:1.62}
.ln{display:block;white-space:pre-wrap;word-break:break-word}
.ln.blank{display:block;height:.85em}
.rule-major{color:var(--green-dim)}
.rule-minor{color:var(--green-faint)}
.head{display:block;color:var(--green-bright);font-weight:600;text-shadow:var(--glow);
  margin-top:.5em;padding-top:.5em;scroll-margin-top:64px}
.subhead{display:block;color:var(--green-soft);font-weight:600;letter-spacing:.02em;scroll-margin-top:64px}
.cmd{color:var(--green-bright);cursor:pointer;border-radius:2px;transition:background .1s}
.cmd:hover{background:rgba(95,255,149,.14)}
.cmd.copied{background:var(--green-bright);color:#06120a}
.sep{color:var(--green-faint)}
.desc{color:var(--green-dim)}
.cmt{color:var(--amber-dim);font-style:italic}
.bx{color:var(--amber);font-weight:600}
.arr{color:var(--green-dim)}
.num{color:var(--amber)}
.ln.hit{background:rgba(255,210,94,.16);box-shadow:-3px 0 0 var(--amber);animation:fade 2.4s ease}
@keyframes fade{0%{background:rgba(255,210,94,.32)}100%{background:rgba(255,210,94,.08)}}

/* boot overlay */
.boot{position:fixed;inset:0;z-index:9999;background:var(--bg);display:flex;align-items:center;justify-content:center;
  transition:opacity .5s ease}
.boot.done{opacity:0;pointer-events:none}
.boot pre{color:var(--green);text-shadow:var(--glow);font-size:13px;line-height:1.7;white-space:pre;margin:0}
.boot .bc{display:inline-block;width:8px;height:1em;background:var(--green);vertical-align:-2px;animation:blink 1s steps(1) infinite}

@media (max-width:840px){
  .shell{grid-template-columns:1fr}
  /* menu (sidebar) hidden on mobile across all pages; nav via cards, breadcrumbs, search */
  .side{display:none}
  .main{padding:22px 18px 60px}
  .topbar{gap:10px;padding:0 12px}
  .brand{font-size:11px;letter-spacing:.02em}
  .searchwrap{max-width:none}
  .status .st-txt{display:none}
  .status .clock{display:none}
  .player{gap:6px}
  .mp-info{display:none}
}