:root{
  --ink:#1a2229; --ink-soft:#54636c; --paper:#f6f7f8; --paper-2:#eceff1;
  --card:#ffffff; --line:#d9e0e4; --primary:#1565c0; --primary-soft:#e4eefb;
  --code-bg:#eef1f3; --shadow:0 1px 2px rgba(26,34,41,.06),0 4px 14px rgba(26,34,41,.05);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#e9edf0; --ink-soft:#aab7bf; --paper:#14181c; --paper-2:#1b2126;
    --card:#1e252b; --line:#2b343b; --primary:#6ea8e8; --primary-soft:#1b2a3d;
    --code-bg:#262e34; --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --ink:#e9edf0; --ink-soft:#aab7bf; --paper:#14181c; --paper-2:#1b2126;
  --card:#1e252b; --line:#2b343b; --primary:#6ea8e8; --primary-soft:#1b2a3d;
  --code-bg:#262e34; --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;}
h1,h2,h3{font-family:"Arial Narrow","Helvetica Neue Condensed","Segoe UI Semibold",-apple-system,sans-serif;text-wrap:balance;}
code,.mono{font-family:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace;}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.topbar{border-bottom:1px solid var(--line);background:var(--paper-2)}
.topbar-in{max-width:1180px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:10px;font-size:14px}
.topbar a{color:var(--ink-soft);font-weight:600}
.topbar .sep{color:var(--line)}
.topbar .cur{color:var(--ink);font-weight:700}
.layout{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:270px 1fr;gap:0;min-height:70vh}
.layout.solo{grid-template-columns:1fr}
@media (max-width:860px){.layout{grid-template-columns:1fr}}
aside.tree{border-right:1px solid var(--line);padding:28px 20px 40px}
@media (max-width:860px){aside.tree{border-right:none;border-bottom:1px solid var(--line)}}
aside.tree h4{font-size:11.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-soft);margin:0 0 12px}
aside.tree ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}
aside.tree li a{display:block;padding:7px 10px;border-radius:7px;font-size:14px;color:var(--ink-soft);border-left:2px solid transparent}
aside.tree li a:hover{background:var(--paper-2);text-decoration:none;color:var(--ink)}
aside.tree li a.active{background:var(--accent-soft);color:var(--accent);font-weight:700;border-left-color:var(--accent)}
main.content{padding:36px 32px 80px}
.module-tag{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:999px;font-size:12px;font-weight:700;
  letter-spacing:.03em;text-transform:uppercase;background:var(--accent-soft);color:var(--accent);margin-bottom:14px}
.module-tag .dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}
h1.pt{font-size:clamp(24px,3vw,32px);font-weight:800;margin:0 0 6px;letter-spacing:-.005em}
p.tagline{color:var(--ink-soft);font-size:16.5px;max-width:62ch;margin:0 0 28px}
.where{display:inline-block;font-size:13px;background:var(--code-bg);padding:3px 10px;border-radius:6px;margin-bottom:22px;color:var(--ink-soft)}
.shot{margin:20px 0 26px;border:1px dashed var(--line);border-radius:10px;background:var(--paper-2);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:34px 20px;color:var(--ink-soft)}
.shot .camera{font-size:22px}
.shot .fname{font-size:12px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;background:var(--code-bg);padding:2px 8px;border-radius:5px}
.shot img{max-width:100%;border-radius:8px;display:none}
.shot img.loaded{display:block}
h3.stp{font-size:12.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--ink-soft);margin:28px 0 10px;font-weight:700}
ol.steps{margin:0 0 24px;padding-left:22px;display:flex;flex-direction:column;gap:10px}
ol.steps li{font-size:15px}
ol.steps li::marker{color:var(--accent);font-weight:700}
.callout{display:flex;gap:12px;padding:15px 17px;border-radius:10px;border:1px solid var(--line);background:var(--card);
  box-shadow:var(--shadow);margin:0 0 26px;border-left:3px solid #c85a00}
.callout p{margin:0;font-size:14.5px;color:var(--ink-soft)}
.callout strong{color:var(--ink)}
.pagenav{display:flex;justify-content:space-between;gap:16px;margin-top:36px;padding-top:20px;border-top:1px solid var(--line)}
.pagenav a{font-size:14px;font-weight:700;color:var(--ink-soft)}
.pagenav a:hover{color:var(--accent)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:8px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;box-shadow:var(--shadow)}
.card .dot2{width:10px;height:10px;border-radius:50%;margin-bottom:12px}
.card h3{margin:0 0 6px;font-size:17px;font-weight:800}
.card p{margin:0 0 10px;font-size:14px;color:var(--ink-soft)}
.card .go{font-size:13px;font-weight:700}
.hub-list{list-style:none;margin:26px 0;padding:0;border-top:1px solid var(--line)}
.hub-list li{border-bottom:1px solid var(--line)}
.hub-list a{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 4px;color:var(--ink)}
.hub-list a:hover{text-decoration:none;background:var(--paper-2)}
.hub-list .t{font-weight:700;font-size:15.5px}
.hub-list .s{font-size:13.5px;color:var(--ink-soft);font-weight:400;display:block;margin-top:2px}
.hub-list .arrow{color:var(--ink-soft);font-size:18px}
.extra{margin-top:34px;padding:20px 22px;border-radius:12px;background:var(--paper-2);border:1px solid var(--line)}
.extra h4{margin:0 0 8px;font-size:14.5px;text-transform:uppercase;letter-spacing:.05em}
.extra p{margin:0;color:var(--ink-soft);font-size:14.5px}