/* ===== HNM Learning — Cognite Data Fusion Learning Path ===== */
:root{
  --bg:#f6f7fb; --surface:#ffffff; --surface-2:#eef1f8; --border:#dfe3ee;
  --text:#1c2130; --muted:#5b6478; --faint:#8a92a6;
  --primary:#1e2fd6; --primary-2:#3b4be0; --primary-soft:#e7eafd;
  --purple:#7c3aed; --purple-soft:#f1e9fe;
  --teal:#0f9d9a; --teal-soft:#e0f5f4;
  --orange:#d97706; --orange-soft:#fdf0dc;
  --green:#16a34a; --green-soft:#e3f6e9;
  --red:#dc2626; --red-soft:#fde8e8;
  --code-bg:#0f172a; --code-text:#e2e8f0;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 4px 16px rgba(16,24,40,.06);
  --radius:12px; --sidebar-w:280px; --content-w:1180px; --rail-w:56px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0f1420; --surface:#161c2b; --surface-2:#1d2538; --border:#2a3349;
    --text:#e6e9f2; --muted:#a3acc2; --faint:#7d8699;
    --primary:#7b8cff; --primary-2:#98a5ff; --primary-soft:#1f2749;
    --purple:#b48cff; --purple-soft:#2b2146;
    --teal:#3dd6d0; --teal-soft:#123634;
    --orange:#f5a524; --orange-soft:#3a2a10;
    --green:#4ade80; --green-soft:#12301d;
    --red:#f87171; --red-soft:#3a1616;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 4px 16px rgba(0,0,0,.35);
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 "Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:2.1rem} h2{font-size:1.55rem;margin-top:2.2em;padding-top:.4em} h3{font-size:1.2rem;margin-top:1.6em} h4{font-size:1.02rem;margin-top:1.2em}
p{margin:0 0 1em}
ul,ol{padding-left:1.4em;margin:0 0 1em}
li{margin:.25em 0}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:var(--surface-2);padding:.1em .4em;border-radius:5px}
pre{background:var(--code-bg);color:var(--code-text);padding:14px 16px;border-radius:10px;overflow-x:auto;font-size:.86rem;line-height:1.55;margin:0 0 1.2em}
pre code{background:none;padding:0;color:inherit;font-size:inherit}
table{border-collapse:collapse;width:100%;margin:0 0 1.4em;font-size:.94rem}
th,td{border:1px solid var(--border);padding:9px 12px;text-align:left;vertical-align:top}
th{background:var(--surface-2);font-weight:600}
.table-wrap{overflow-x:auto;margin:0 0 1.4em}
.table-wrap table{margin:0}
hr{border:0;border-top:1px solid var(--border);margin:2em 0}
.muted{color:var(--muted)} .small{font-size:.9rem}
.badge{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:3px 9px;border-radius:999px;background:var(--primary-soft);color:var(--primary)}
.badge.beginner{background:var(--green-soft);color:var(--green)}
.badge.intermediate{background:var(--orange-soft);color:var(--orange)}
.badge.expert{background:var(--purple-soft);color:var(--purple)}
.badge.teal{background:var(--teal-soft);color:var(--teal)}

/* ---- Top bar ---- */
.topbar{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:1px solid var(--border)}
.topbar-inner{max-width:1600px;margin:0 auto;padding:0 20px;height:60px;display:flex;align-items:center;gap:18px;position:relative}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.02rem;color:var(--text);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand .logo{width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,var(--primary),var(--purple));display:grid;place-items:center;color:#fff;font-size:.85rem;font-weight:900}
.brand small{display:block;font-weight:500;font-size:.72rem;color:var(--muted);line-height:1}
.topnav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.topnav a{padding:7px 10px;border-radius:8px;color:var(--muted);font-weight:600;font-size:.88rem;white-space:nowrap}
.topnav a:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}
.topnav a.active{background:var(--primary-soft);color:var(--primary)}
.menu-btn{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;color:var(--text);font-size:1.1rem;cursor:pointer}

/* ---- Layout ---- */
.layout{max-width:1600px;margin:0 auto;display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);gap:36px;padding:28px 24px}
.sidebar{position:sticky;top:76px;align-self:start;max-height:calc(100vh - 92px);overflow-y:auto;padding-right:6px}
.sidebar h5{margin:0 0 8px;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint)}
.sidebar ol{list-style:none;padding:0;margin:0 0 18px}
.sidebar li a{display:flex;gap:8px;align-items:flex-start;padding:7px 10px;border-radius:8px;color:var(--muted);font-size:.9rem;line-height:1.35}
.sidebar li a:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}
.sidebar li a.active{background:var(--primary-soft);color:var(--primary);font-weight:600}
.sidebar li a .n{flex:0 0 22px;height:22px;border-radius:6px;background:var(--surface-2);color:var(--muted);font-size:.72rem;font-weight:700;display:grid;place-items:center}
.sidebar li a.done .n{background:var(--green-soft);color:var(--green)}
.sidebar .progress{margin:6px 0 18px;background:var(--surface-2);border-radius:999px;height:8px;overflow:hidden}
.sidebar .progress i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--teal));width:0;transition:width .4s}
.content{max-width:var(--content-w);min-width:0}
.content > section{scroll-margin-top:80px}
.single{max-width:1240px;margin:0 auto;padding:28px 24px}

/* ---- Hero ---- */
.hero{background:linear-gradient(135deg,#1a237e 0%,#1e2fd6 45%,#6d28d9 100%);color:#fff;border-radius:18px;padding:44px 40px;margin-bottom:28px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:340px;height:340px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero h1{color:#fff;font-size:2.4rem;margin-bottom:.35em}
.hero p{font-size:1.1rem;max-width:760px;color:rgba(255,255,255,.9)}
.hero .badge{background:rgba(255,255,255,.18);color:#fff}
.hero-meta{display:flex;gap:18px;flex-wrap:wrap;margin-top:18px;font-size:.92rem;color:rgba(255,255,255,.85)}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px;position:relative;z-index:1}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;font-weight:700;background:var(--primary);color:#fff;border:0;cursor:pointer;font-size:.95rem}
.btn:hover{background:var(--primary-2);text-decoration:none}
.btn.light{background:#fff;color:#1e2fd6}
.btn.light:hover{background:#eef1ff}
.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--text)}
.hero .btn.ghost{border-color:rgba(255,255,255,.5);color:#fff}
.hero .btn.ghost:hover{background:rgba(255,255,255,.12)}

/* ---- Cards ---- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin:0 0 1.6em}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow)}
.card h3{margin-top:0;font-size:1.08rem}
.card.level{border-top:5px solid var(--green)}
.card.level.intermediate{border-top-color:var(--orange)}
.card.level.expert{border-top-color:var(--purple)}
.card .meta{font-size:.85rem;color:var(--muted);margin-bottom:8px}
.card ul{margin:8px 0 0;padding-left:1.15em;font-size:.93rem}
.card .btn{margin-top:12px;font-size:.88rem;padding:8px 14px}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;text-align:center}
.stat b{display:block;font-size:1.7rem;color:var(--primary);line-height:1.1}
.stat span{font-size:.85rem;color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:0 0 1.6em}

/* ---- Callouts ---- */
.callout{border-left:5px solid var(--primary);background:var(--primary-soft);border-radius:0 12px 12px 0;padding:14px 18px;margin:1.2em 0}
.callout .t{font-weight:800;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px;display:flex;align-items:center;gap:6px}
.callout p:last-child,.callout ul:last-child,.callout ol:last-child{margin-bottom:0}
.callout.analogy{border-color:var(--orange);background:var(--orange-soft)} .callout.analogy .t{color:var(--orange)}
.callout.key{border-color:var(--primary);background:var(--primary-soft)} .callout.key .t{color:var(--primary)}
.callout.tip{border-color:var(--teal);background:var(--teal-soft)} .callout.tip .t{color:var(--teal)}
.callout.exercise{border-color:var(--green);background:var(--green-soft)} .callout.exercise .t{color:var(--green)}
.callout.warn{border-color:var(--red);background:var(--red-soft)} .callout.warn .t{color:var(--red)}
.callout.ai{border-color:var(--purple);background:var(--purple-soft)} .callout.ai .t{color:var(--purple)}

/* ---- Figures & diagrams ---- */
figure{margin:1.4em 0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
figure img{display:block;margin:0 auto;border-radius:8px}
figure.wide{padding:8px}
figure.light-only img{background:#fff;padding:6px}
figure figcaption{font-size:.86rem;color:var(--muted);margin-top:10px;line-height:1.5}
figure figcaption b{color:var(--text)}
.diagram{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin:1.4em 0;box-shadow:var(--shadow)}
.diagram svg{width:100%;height:auto;display:block;font-family:inherit}
.diagram .cap{font-size:.86rem;color:var(--muted);margin-top:10px}
/* CSS flow (horizontal boxes with arrows) */
.flow{display:flex;flex-wrap:wrap;align-items:stretch;gap:10px;margin:1.2em 0}
.flow .step{flex:1 1 130px;min-width:130px;background:var(--surface);border:1px solid var(--border);border-top:4px solid var(--primary);border-radius:10px;padding:14px 12px 10px;position:relative;box-shadow:var(--shadow)}
.flow .step b{display:block;font-size:.95rem;margin-bottom:4px}
.flow .step span{font-size:.83rem;color:var(--muted);line-height:1.4;display:block}
.flow .step .k{position:absolute;top:-13px;left:10px;background:var(--primary);color:#fff;font-size:.7rem;font-weight:800;padding:2px 8px;border-radius:999px}
.flow .step.src{border-top-color:var(--orange)} .flow .step.src .k{background:var(--orange)}
.flow .step.graph{border-top-color:var(--teal)} .flow .step.graph .k{background:var(--teal)}
.flow .step.app{border-top-color:var(--purple)} .flow .step.app .k{background:var(--purple)}
.flow .arrow{align-self:center;color:var(--faint);font-size:1.4rem;flex:0 0 auto}
@media (max-width:700px){.flow .arrow{display:none}}

/* Layer stack */
.stack{display:flex;flex-direction:column;gap:8px;margin:1.2em 0}
.layer{display:grid;grid-template-columns:160px 1fr;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 14px;box-shadow:var(--shadow)}
.layer .name{font-weight:800;font-size:.86rem;padding:8px 10px;border-radius:8px;color:#fff;text-align:center;background:var(--primary)}
.layer .items{display:flex;flex-wrap:wrap;gap:6px}
.layer .items span{background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:3px 10px;font-size:.8rem}
.layer.l1 .name{background:#d97706} .layer.l2 .name{background:#2563eb} .layer.l3 .name{background:#0f9d9a}
.layer.l4 .name{background:#4f46e5} .layer.l5 .name{background:#7c3aed} .layer.l6 .name{background:#0891b2}
.layer.l7 .name{background:#059669} .layer.l8 .name{background:#475569}
@media (max-width:600px){.layer{grid-template-columns:1fr}}

/* Glossary / definition grid */
.defs{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px;margin:0 0 1.4em}
.def{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 14px}
.def b{display:block;color:var(--primary);margin-bottom:3px}
.def span{font-size:.9rem;color:var(--muted)}

/* Module header */
.module-head{display:flex;align-items:center;gap:14px;margin:2.6em 0 .6em;padding-top:1em;border-top:2px solid var(--border)}
.module-head .num{flex:0 0 46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--purple));color:#fff;display:grid;place-items:center;font-weight:900;font-size:1.1rem}
.module-head h2{margin:0;padding:0}
.module-head .time{margin-left:auto;font-size:.85rem;color:var(--muted);white-space:nowrap}
.objectives{background:var(--surface);border:1px dashed var(--border);border-radius:10px;padding:12px 16px;margin:0 0 1.4em;font-size:.94rem}
.objectives b{display:block;margin-bottom:4px}
.objectives ul{margin:0}

/* Resource list */
.res{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:12px;margin:0 0 1.6em}
.res a.item{display:block;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 14px;color:var(--text)}
.res a.item:hover{border-color:var(--primary);text-decoration:none}
.res .item b{display:block;color:var(--primary);font-size:.95rem}
.res .item span{font-size:.85rem;color:var(--muted)}
.res .item .type{float:right;font-size:.68rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase;background:var(--surface-2);color:var(--muted);padding:2px 7px;border-radius:999px;margin-left:8px}
.video{position:relative;aspect-ratio:16/9;max-width:100%;background:#000;border-radius:10px;overflow:hidden;margin:0 0 6px}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.videos{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin:0 0 1.6em}
.videos .v b{display:block;font-size:.92rem} .videos .v span{font-size:.82rem;color:var(--muted)}

/* Quiz */
.quiz{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin:1.2em 0}
.quiz .q{margin:0 0 14px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.quiz .q:last-of-type{border-bottom:0}
.quiz .q p{font-weight:600;margin-bottom:6px}
.quiz label{display:block;padding:6px 10px;border-radius:8px;cursor:pointer;font-size:.94rem}
.quiz label:hover{background:var(--surface-2)}
.quiz label.correct{background:var(--green-soft)} .quiz label.wrong{background:var(--red-soft)}
.quiz .result{font-weight:700;margin-top:10px}

/* Checklist */
.check{list-style:none;padding:0}
.check li{display:flex;gap:10px;align-items:flex-start;padding:6px 0}
.check input{margin-top:5px;width:16px;height:16px;flex:0 0 16px}

/* Footer & nav */
.pager{display:flex;justify-content:space-between;gap:12px;margin:3em 0 1em;flex-wrap:wrap}
.pager a{flex:1 1 220px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 16px;color:var(--text)}
.pager a small{display:block;color:var(--muted);font-size:.78rem}
.pager a:hover{border-color:var(--primary);text-decoration:none}
footer{border-top:1px solid var(--border);margin-top:30px;padding:22px 20px;color:var(--muted);font-size:.85rem;text-align:center}
.toc-inline{columns:2;column-gap:28px;font-size:.93rem}
@media (max-width:700px){.toc-inline{columns:1}}

/* Outline (intermediate/expert) */
.topic{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 22px;margin:0 0 16px;box-shadow:var(--shadow)}
.topic h3{margin-top:0;display:flex;align-items:center;gap:10px}
.topic h3 .n{flex:0 0 32px;height:32px;border-radius:8px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font-size:.85rem;font-weight:800}
.topic .why{color:var(--muted);font-size:.94rem;margin-bottom:8px}
.topic ul.sub{margin:6px 0 10px}
.topic .links{font-size:.86rem}
.topic .links a{margin-right:12px;white-space:nowrap}

/* Responsive */
@media (max-width:1000px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:fixed;top:60px;left:0;bottom:0;width:min(320px,88vw);background:var(--surface);border-right:1px solid var(--border);padding:18px;transform:translateX(-105%);transition:transform .25s;z-index:60;max-height:none}
  .sidebar.open{transform:none}
  .menu-btn{display:inline-block}
  .menu-btn.nav-toggle{margin-left:auto}
  .topnav{display:none}
  .topnav.open{display:flex;position:absolute;top:60px;right:12px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:8px;flex-direction:column;box-shadow:var(--shadow)}
  .hero{padding:30px 22px} .hero h1{font-size:1.8rem}
}
@media print{.topbar,.sidebar,.pager,.menu-btn{display:none} .layout{display:block} body{background:#fff}}

/* ---- Lightbox (click-to-enlarge with zoom & pan) ---- */
figure img.zoomable{cursor:zoom-in}
figure{position:relative}
figure .zoom-hint{position:absolute;top:22px;right:22px;background:rgba(17,24,39,.78);color:#fff;font-size:.74rem;font-weight:600;padding:5px 10px;border-radius:999px;pointer-events:none;letter-spacing:.02em}
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(8,12,22,.97);display:flex;flex-direction:column;color:#fff}
.lightbox[hidden]{display:none}
.lb-bar{display:flex;align-items:center;gap:10px;padding:8px 14px;background:rgba(0,0,0,.45);flex-wrap:wrap}
.lb-title{font-size:.9rem;font-weight:600;flex:1 1 200px;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lb-controls{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.lb-controls button,.lb-controls a{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);color:#fff;border-radius:8px;padding:6px 11px;font-size:.85rem;font-weight:700;cursor:pointer;line-height:1;text-decoration:none}
.lb-controls button:hover,.lb-controls a:hover{background:rgba(255,255,255,.22);text-decoration:none}
.lb-controls .lb-pct{min-width:52px;text-align:center;font-size:.85rem;font-variant-numeric:tabular-nums}
.lb-controls button[data-z="close"]{background:rgba(220,38,38,.8);border-color:transparent}
.lb-stage{flex:1;position:relative;overflow:hidden;cursor:grab;touch-action:none;contain:strict}
.lb-stage.dragging{cursor:grabbing}
.lb-stage img{position:absolute;left:0;top:0;max-width:none;user-select:none;-webkit-user-drag:none;background:#fff;border-radius:4px;box-shadow:0 8px 40px rgba(0,0,0,.5)}
.lb-hint{text-align:center;font-size:.78rem;color:rgba(255,255,255,.7);padding:6px 10px 8px}

/* ---- Branding: HNM CONSULTANTS wordmark + Cognite logo ---- */
.hnm{display:inline-flex;align-items:baseline;gap:.35em;line-height:1;white-space:nowrap;text-decoration:none}
.hnm b{font-weight:900;font-size:1.22rem;letter-spacing:.01em;color:var(--primary)}
.hnm span{font-weight:700;font-size:.72rem;letter-spacing:.2em;color:var(--text)}
.brand{gap:14px}
.brand .sep{width:1px;height:30px;background:var(--border);flex:0 0 1px}
.brand .cog-logo{height:26px;width:auto;display:block}
.brand .ttl{display:flex;flex-direction:column;line-height:1.15;font-weight:800;font-size:.98rem;color:var(--text)}
.brand .ttl small{display:block;font-weight:500;font-size:.72rem;color:var(--muted);line-height:1.2}
.cog-logo{color:#000}
@media (prefers-color-scheme: dark){ .brand .cog-logo, .footer-brand .cog-logo{filter:invert(1)} }
.hero-brand{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:22px;position:relative;z-index:1}
.hero-brand .hnm b,.hero-brand .hnm span{color:#fff}
.hero-brand .hnm span{opacity:.9}
.hero-brand .cog-logo{height:30px;filter:brightness(0) invert(1);opacity:.95}
.hero-brand .by{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.75);font-weight:700;white-space:nowrap}
.hero-brand .lhs,.hero-brand .rhs{display:flex;align-items:center;gap:12px}
footer{text-align:left}
.footer-brand{max-width:1600px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.footer-brand .col p{margin:8px 0 0;font-size:.85rem;color:var(--muted);line-height:1.55}
.footer-brand .cog-logo{height:28px;display:block}
.footer-brand .hnm b{font-size:1.35rem}
.footer-brand .hnm span{font-size:.78rem}
.footer-legal{max-width:1600px;margin:18px auto 0;padding-top:14px;border-top:1px solid var(--border);font-size:.8rem;color:var(--faint);text-align:center}
@media (max-width:1000px){
  .brand .sep,.brand .ttl{display:none}
  .brand .cog-logo{height:22px}
  .footer-brand{grid-template-columns:1fr}
}
@media (max-width:480px){ .brand .cog-logo{display:none} }

/* ---- Collapsible sidebar (desktop) & reading width ---- */
.side-collapse{display:flex;align-items:center;gap:8px;width:100%;margin:0 0 14px;padding:7px 10px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--muted);font:600 .8rem/1 Inter,system-ui,sans-serif;cursor:pointer;text-align:left}
.side-collapse:hover{color:var(--text);border-color:var(--primary)}
.side-collapse kbd{margin-left:auto;font:600 .7rem ui-monospace,Menlo,Consolas,monospace;background:var(--surface-2);border:1px solid var(--border);border-radius:5px;padding:1px 6px;color:var(--faint)}
.rail{display:none}
@media (min-width:1001px){
  html.nav-collapsed .layout{grid-template-columns:var(--rail-w) minmax(0,1fr);gap:28px}
  html.nav-collapsed .sidebar{overflow:visible;padding-right:0}
  html.nav-collapsed .sidebar > *:not(.rail){display:none}
  html.nav-collapsed .sidebar .rail{display:flex;flex-direction:column;align-items:center;gap:6px}
  html.nav-collapsed .content{max-width:1300px}
  .rail button{width:38px;height:38px;border-radius:9px;border:1px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer;font-weight:800;font-size:1rem;margin-bottom:6px}
  .rail button:hover{border-color:var(--primary);color:var(--primary)}
  .rail a{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;font-size:.8rem;font-weight:800;color:var(--muted);background:var(--surface-2);border:1px solid transparent;position:relative;text-decoration:none}
  .rail a:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}
  .rail a.active{background:var(--primary-soft);color:var(--primary)}
  .rail a.done{background:var(--green-soft);color:var(--green)}
  .rail a[title]:hover::after{content:attr(title);position:absolute;left:46px;top:50%;transform:translateY(-50%);background:var(--text);color:var(--bg);padding:6px 10px;border-radius:7px;font-size:.8rem;font-weight:600;white-space:nowrap;z-index:70;box-shadow:var(--shadow)}
  .rail .sep{width:22px;height:1px;background:var(--border);margin:6px 0}
}
@media (max-width:1000px){ .side-collapse,.rail{display:none !important} }
@media (min-width:1400px){ body{font-size:17px} }