/* ============================================================
   Phase 3: the chosen direction, "The blue edge" on a familiar
   app structure. A white sidebar, white cards on paper, and the
   reef-water gradient spent once, on the Home band. Magenta is
   kept for one primary action per view.

   Its tokens are namespaced --hb-* for now, so the views not yet
   redone keep their first-prototype look inside the new shell.
   Phase 4 retires the old set.
   ============================================================ */
:root{
  color-scheme:light;
  --hb-paper:#F6F7FB;
  --hb-surface:#FFFFFF;
  --hb-ink:#1C244B;
  --hb-ink-2:#525C73;
  --hb-line:rgba(28,36,75,.11);
  --hb-line-strong:rgba(28,36,75,.24);
  --hb-cyan:#1E96D3;          /* marks, icons, active states */
  --hb-link:#1D74AA;          /* text links: brand cyan is too light for text on white */
  --hb-tint:#E8F4FB;
  --hb-navy:#1C244B;
  --hb-magenta:#C21FD1;
  --hb-purple:#841E87;
  --hb-avatar:#1C244B;
  --hb-shadow:0 1px 2px rgba(28,36,75,.04), 0 4px 14px rgba(28,36,75,.05);
  --hb-ok:#1E7D42;
  --hb-font:'Figtree',system-ui,-apple-system,sans-serif;
  --hb-display:'Poppins',system-ui,-apple-system,sans-serif;
  --hb-side:248px;
  --hb-strip:42px;
}
/* dark is deep water: Space for the ground, navy surfaces, the glow cyan for marks */
:root[data-theme="dark"]{
  color-scheme:dark;
  --hb-paper:#0B1128;
  --hb-surface:#151C3D;
  --hb-ink:#F1F4FB;
  --hb-ink-2:#AEB6CC;
  --hb-line:rgba(174,182,204,.16);
  --hb-line-strong:rgba(174,182,204,.32);
  --hb-cyan:#48B6F0;
  --hb-link:#6CC4F2;
  --hb-tint:rgba(72,182,240,.14);
  --hb-avatar:#1D74AA;
  --hb-shadow:0 1px 2px rgba(0,0,0,.35);
  --hb-ok:#6DD38A;
}

.sr{position:absolute !important; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap}

/* ---------- the shell ---------- */
.demostrip{position:sticky; top:0}
.demostrip-inner{min-height:var(--hb-strip)}
.shell{
  display:grid; grid-template-columns:var(--hb-side) minmax(0,1fr);
  min-height:calc(100vh - var(--hb-strip)); background:var(--hb-paper); color:var(--hb-ink);
}
.shell :focus-visible{outline:2px solid var(--hb-cyan); outline-offset:2px; border-radius:8px}
.sidebar{
  position:sticky; top:var(--hb-strip); height:calc(100vh - var(--hb-strip));
  display:flex; flex-direction:column; padding:22px 16px 16px; overflow-y:auto;
  background:var(--hb-surface); border-right:1px solid var(--hb-line); font-family:var(--hb-font);
}
.sb-brand{display:flex; flex-direction:column; gap:6px; padding:2px 10px 26px; color:var(--hb-ink)}
.sb-brand:hover{text-decoration:none}
.sb-brand img{display:block; width:148px; height:auto}
.sb-acad{font:700 11px/1 var(--hb-font); letter-spacing:.42em; text-transform:uppercase; padding-left:2px}
.sb-nav{display:flex; flex-direction:column; gap:2px}
.sb-nav a, .sb-nav button{
  display:flex; align-items:center; gap:12px; width:100%; min-height:42px; padding:0 12px;
  border:0; border-radius:10px; background:none; text-align:left;
  color:var(--hb-ink-2); font:500 15px/1.2 var(--hb-font);
  transition:background-color .15s, color .15s;
}
.sb-nav a:hover, .sb-nav button:hover{background:var(--hb-paper); color:var(--hb-ink); text-decoration:none}
.sb-nav a[aria-current="page"]{background:var(--hb-tint); color:var(--hb-ink); font-weight:600}
.sb-nav svg{width:20px; height:20px; flex:0 0 20px}
.sb-nav a[aria-current="page"] svg{color:var(--hb-cyan)}
.sb-count{margin-left:auto; font-size:13px; font-weight:500; color:var(--hb-ink-2); font-variant-numeric:tabular-nums}
.sb-sub{margin-top:12px; padding-top:12px; border-top:1px solid var(--hb-line)}
.sb-me{display:flex; align-items:center; gap:12px; margin-top:auto; padding:14px 10px 2px; border-top:1px solid var(--hb-line)}
.sb-av, .mb-av{
  flex:0 0 40px; width:40px; height:40px; display:grid; place-items:center; border-radius:50%;
  background:var(--hb-avatar); color:#fff; font:600 14px/1 var(--hb-font);
}
.sb-who{min-width:0}
.sb-who b{display:block; font-weight:600; line-height:20px; color:var(--hb-ink)}
.sb-who span{display:block; font-size:13px; line-height:18px; color:var(--hb-ink-2)}
.shell-main{min-width:0}
.shell .page{max-width:1192px; margin:0 auto; padding:28px 40px 72px}
.shell .routefade{animation:hbfade .2s ease-out both}
@keyframes hbfade{from{opacity:.001}}
.mbar, .tabs{display:none}

/* ---------- redone views share one scope ---------- */
.hb-view{font-family:var(--hb-font); font-size:15px; line-height:1.55; color:var(--hb-ink)}
.hb-view h1, .hb-view h2, .hb-view h3{font-family:var(--hb-display); color:inherit}
.hb-view a{color:inherit}
.hb-view a:hover{text-decoration:none}

/* the one signature: Curaçao's reef water, navy at the drop-off, cyan in the shallows */
.hb-band{
  position:relative; isolation:isolate; overflow:hidden; border-radius:14px;
  padding:34px 44px 30px; color:#fff; background:var(--hb-navy);
}
.hb-band::before{
  content:""; position:absolute; inset:0 0 0 42%; z-index:-1;
  background:linear-gradient(90deg,#1C244B 8%,#1E96D3 68%,#48B6F0);
}
.hb-band .contours{
  position:absolute; top:0; right:0; z-index:-1; width:min(560px,58%); height:100%;
  fill:none; stroke:#fff; stroke-opacity:.16; stroke-width:1;
}
.hb-band .contours path{vector-effect:non-scaling-stroke}
.hb-band h1{font-size:40px; line-height:48px; font-weight:700; letter-spacing:-.03em}
.hb-search{position:relative; max-width:560px; margin-top:18px}
.hb-search svg{position:absolute; left:16px; top:15px; width:20px; height:20px; color:#525C73; pointer-events:none}
.hb-search input{
  width:100%; height:50px; padding:0 16px 0 46px; border:0; border-radius:10px;
  background:#fff; color:#1C244B; font:400 16px var(--hb-font);
}
.hb-search input::placeholder{color:#525C73}
.hb-search input:focus-visible{outline:2px solid #48B6F0; outline-offset:2px}
.hb-band .hint{display:flex; flex-wrap:wrap; align-items:center; gap:4px 16px; margin-top:12px; color:rgba(255,255,255,.82)}
.hb-band .hint button{
  padding:4px 0; border:0; background:none; color:#fff; font:500 15px/22px var(--hb-font);
  text-decoration:underline; text-decoration-color:rgba(255,255,255,.4); text-underline-offset:4px;
  transition:text-decoration-color .15s;
}
.hb-band .hint button:hover{text-decoration-color:#fff}

/* format tiles: icon, label, count. An empty format is not a link. */
.hb-tiles{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:20px; margin-top:20px}
.hb-tile{
  display:flex; align-items:center; gap:14px; min-height:64px; padding:12px 20px;
  background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow);
  font-size:16px; font-weight:600; line-height:1.25; transition:border-color .15s;
}
a.hb-tile:hover{border-color:var(--hb-cyan)}
.hb-tile svg{width:22px; height:22px; flex:0 0 22px; color:var(--hb-cyan)}
.hb-tile .n{margin-left:auto; padding-left:8px; font-size:14px; font-weight:500; color:var(--hb-ink-2); font-variant-numeric:tabular-nums}
.hb-tile.off{background:transparent; box-shadow:none; border-style:dashed; color:var(--hb-ink-2); font-weight:500}
.hb-tile.off svg{color:var(--hb-ink-2)}

/* a course: what it is, how long it stays open, the way in, and the last thing opened */
.hb-course{
  display:grid; grid-template-columns:minmax(0,1fr) auto; gap:24px; align-items:center;
  margin-top:20px; padding:20px 24px; background:var(--hb-surface);
  border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow);
}
.hb-course h2{font-size:18px; line-height:26px; font-weight:600; letter-spacing:-.02em}
.hb-meta{margin-top:4px; font-size:14px; color:var(--hb-ink-2); font-variant-numeric:tabular-nums}
.hb-meta .nw{white-space:nowrap}
.hb-link{display:inline-flex; align-items:center; gap:6px; margin-top:12px; color:var(--hb-link); font-weight:600}
.hb-view a.hb-link{color:var(--hb-link)}
.hb-link:hover{text-decoration:underline !important; text-underline-offset:4px}
.hb-link svg{width:16px; height:16px}
.hb-last{display:flex; align-items:center; gap:8px; margin-top:10px; font-size:14px; color:var(--hb-ink-2)}
.hb-last svg{width:16px; height:16px; flex:0 0 16px}
.hb-view .hb-last a{color:var(--hb-link); font-weight:600}
.hb-view .hb-last a:hover{text-decoration:underline; text-underline-offset:3px}

/* sections and cards */
.hb-head{display:flex; align-items:baseline; justify-content:space-between; gap:16px; margin:36px 0 14px}
.hb-head h2{font-size:22px; line-height:28px; font-weight:700; letter-spacing:-.03em}
.hb-head .hb-link{margin-top:0}
.hb-cards{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:20px}
.hb-card{
  display:flex; flex-direction:column; padding:22px 24px; background:var(--hb-surface);
  border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow);
}
.hb-card .hb-meta{display:flex; align-items:center; flex-wrap:wrap; gap:8px; margin:0; font-size:13px}
.hb-card h3{margin-top:6px; font-size:17px; line-height:24px; font-weight:600; letter-spacing:-.01em}
.hb-card h3 a:hover{color:var(--hb-link)}
.hb-card h3 .v{font-weight:500; color:var(--hb-ink-2)}
.hb-desc{
  margin-top:8px; color:var(--hb-ink-2); line-height:22px;
  display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden;
}
.hb-use{margin-top:10px; font-size:14px; line-height:21px; color:var(--hb-ink-2)}
.hb-use b{font-weight:600; color:var(--hb-ink)}
.hb-acts{display:flex; align-items:center; flex-wrap:wrap; gap:8px; margin-top:auto; padding-top:18px}
.hb-btn{
  display:inline-flex; align-items:center; gap:8px; min-height:40px; padding:0 18px;
  border:1px solid var(--hb-line-strong); border-radius:999px; background:var(--hb-surface);
  color:var(--hb-ink); font:600 14px/1 var(--hb-font); white-space:nowrap;
  transition:border-color .15s, background-color .15s;
}
.hb-view a.hb-btn{color:var(--hb-ink)}
.hb-btn:hover{border-color:var(--hb-ink); text-decoration:none}
.hb-btn svg{width:16px; height:16px; flex:0 0 16px}
.hb-btn.primary{border-color:transparent; color:#fff; background:linear-gradient(90deg,#C21FD1,#841E87)}
.hb-btn.primary:hover{background:linear-gradient(90deg,#A91AB7,#701A73)}
.hb-btn.ok{border-color:#1E7D42; color:#1E7D42; background:var(--hb-surface)}
:root[data-theme="dark"] .hb-btn.ok{border-color:#6DD38A; color:#6DD38A}
.hb-ghost{
  display:inline-flex; align-items:center; min-height:40px; padding:0 12px; border-radius:999px;
  color:var(--hb-link); font-weight:600; transition:background-color .15s;
}
.hb-view a.hb-ghost{color:var(--hb-link)}
.hb-ghost:hover{background:var(--hb-tint)}
.hb-badge{padding:1px 8px; border-radius:999px; background:var(--hb-tint); color:var(--hb-link); font-size:12px; font-weight:600}
.hb-chk{font-size:13px; color:var(--hb-ink-2)}
.hb-tool .hb-acts{justify-content:space-between; flex-wrap:nowrap}
.hb-chk.old{color:#9A5B00; font-weight:600}
:root[data-theme="dark"] .hb-chk.old{color:#F2B860}
.hb-ttop{display:flex; gap:12px; align-items:center}
.hb-ttop h3{margin-top:0}
.hb-glyph{flex:none; width:40px; height:40px; border-radius:10px; display:grid; place-items:center; background:var(--hb-tint); color:var(--hb-link); font-weight:700}
.hb-vendor{font-size:13px; color:var(--hb-ink-2)}
.hb-caveat{margin-top:8px; font-size:13px; line-height:19px; color:var(--hb-ink-2)}
.hb-toolbar{display:flex; flex-direction:column; gap:14px; margin-top:24px}
.hb-tsearch{position:relative; max-width:380px}
.hb-tsearch svg{position:absolute; left:14px; top:50%; transform:translateY(-50%); width:18px; height:18px; color:var(--hb-ink-2)}
.hb-tsearch input{width:100%; min-height:44px; padding:0 14px 0 42px; border:1px solid var(--hb-line-strong); border-radius:10px; background:var(--hb-surface); color:var(--hb-ink); font:400 15px var(--hb-font)}
.hb-chips{display:flex; flex-wrap:wrap; gap:8px}
.hb-view .hb-chips a{display:inline-flex; align-items:center; gap:6px; min-height:36px; padding:0 14px; border:1px solid var(--hb-line-strong); border-radius:999px; background:var(--hb-surface); color:var(--hb-ink-2); font-size:14px; font-weight:500}
.hb-view .hb-chips a span{opacity:.7}
.hb-view .hb-chips a[aria-current="true"]{background:var(--hb-ink); border-color:var(--hb-ink); color:var(--hb-surface)}
.hb-tnone{margin-top:28px; color:var(--hb-ink-2)}
.hb-me{flex-direction:row; align-items:center; gap:16px; margin-top:24px; max-width:720px}
.hb-me h2{font:600 18px/1.3 var(--hb-display)}
.hb-me p{color:var(--hb-ink-2)}
.hb-me > div{flex:1; min-width:0; overflow-wrap:anywhere}
.hb-avatar{flex:none; width:48px; height:48px; border-radius:50%; display:grid; place-items:center; background:var(--hb-avatar); color:#fff; font-weight:600}
.hb-access{max-width:720px; background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow)}
.hb-arow{display:flex; align-items:center; flex-wrap:wrap; gap:14px; padding:16px 20px}
.hb-arow + .hb-arow{border-top:1px solid var(--hb-line)}
.hb-arow .hb-glyph svg{width:20px; height:20px}
.hb-arow .t{flex:1; min-width:180px; display:flex; flex-direction:column}
.hb-arow .t span{font-size:14px; color:var(--hb-ink-2)}
.hb-pill{padding:3px 10px; border-radius:999px; background:var(--hb-tint); color:var(--hb-link); font-size:13px; font-weight:600; white-space:nowrap}
.hb-pill.ok{background:rgba(30,125,66,.1); color:var(--hb-ok)}
.hb-pill.off{background:rgba(154,91,0,.1); color:#9A5B00}
:root[data-theme="dark"] .hb-pill.off{color:#F2B860}
.hb-fine{max-width:720px; margin-top:20px; font-size:14px; color:var(--hb-ink-2)}
.hb-fine b{color:var(--hb-ink)}
.hb-view .hb-fine a{color:var(--hb-link); font-weight:600}
.lg{display:flex; min-height:calc(100vh - var(--hb-strip)); font-family:var(--hb-font); color:var(--hb-ink); background:var(--hb-surface)}
.lg-side{position:relative; isolation:isolate; overflow:hidden; flex:1; display:flex; flex-direction:column; justify-content:space-between; gap:32px; padding:48px; color:#fff; background:linear-gradient(120deg,#1C244B 10%,#1E96D3 70%,#48B6F0)}
.lg-side .contours{position:absolute; inset:0; z-index:-1; width:100%; height:100%; fill:none; stroke:#fff; stroke-opacity:.16}
.lg-side img{display:block; height:auto}
.lg-side h2{font:600 34px/1.2 var(--hb-display); letter-spacing:-.02em; max-width:16ch}
.lg-side ul{list-style:none; display:grid; gap:10px; margin:22px 0 0; padding:0}
.lg-side li{display:flex; gap:10px; align-items:center}
.lg-side li svg{width:18px; height:18px; color:#9FE0FF}
.lg-foot{font-size:13px; opacity:.75}
.lg-main{flex:1; display:flex; align-items:center; justify-content:center; padding:40px 20px}
.lg-form{width:100%; max-width:390px}
.lg-form h1{font:600 28px/1.2 var(--hb-display); letter-spacing:-.02em}
.lg-form form{display:flex; flex-direction:column; gap:8px; margin-top:20px}
.lg-form label{font-weight:600; font-size:14px; margin-top:6px}
.lg-form input{min-height:46px; padding:0 14px; border:1px solid var(--hb-line-strong); border-radius:10px; background:var(--hb-surface); color:var(--hb-ink); font:400 16px var(--hb-font)}
.lg-form .lg-otp{font:600 24px var(--hb-font); letter-spacing:.35em; text-align:center}
.lg-wide{width:100%; justify-content:center; min-height:46px; margin-top:10px}
.lg-sub{margin-top:14px; color:var(--hb-ink-2); font-size:15px}
.lg-sub b{color:var(--hb-ink)}
.lg-sub a,.lg .linkbtn{color:var(--hb-link); font-weight:600}
.lg-or{display:flex; align-items:center; gap:10px; margin:18px 0 6px; color:var(--hb-ink-2); font-size:13px}
.lg-or::before,.lg-or::after{content:""; flex:1; height:1px; background:var(--hb-line)}
.lg-eyebrow{display:flex; align-items:center; gap:8px; margin-bottom:8px; color:var(--hb-link); font-weight:600; font-size:14px}
.lg-eyebrow svg{width:18px; height:18px}
.lg-demo{margin-top:28px; padding-top:14px; border-top:1px dashed var(--hb-line-strong); font-size:13px; color:var(--hb-ink-2)}
.lg .demo-emails{margin-top:24px}
@media (max-width:860px){
  .lg{flex-direction:column}
  .lg-side{flex:none; padding:22px 20px; gap:14px}
  .lg-side h2{font-size:22px}
  .lg-side ul,.lg-foot{display:none}
  .lg-main{align-items:flex-start; padding:28px 16px}
}

/* a closed course: said once, calmly, with the way forward */
.hb-note{
  display:flex; gap:16px; align-items:flex-start; margin-top:20px; padding:20px 24px;
  background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow);
}
.hb-note > svg{width:22px; height:22px; flex:0 0 22px; margin-top:2px; color:var(--hb-cyan)}
.hb-note h2{font-size:17px; line-height:24px; font-weight:600}
.hb-note p{margin-top:6px; max-width:70ch; color:var(--hb-ink-2)}
.hb-note .hb-link{margin-top:10px}

/* ---------- page heads on the redone views: type-led, no band ---------- */
.hb-pagehead{padding:4px 0 2px}
.hb-pagehead h1{font-size:32px; line-height:40px; font-weight:600; letter-spacing:-.03em}
.hb-pagehead p{margin-top:6px; max-width:64ch; font-size:16px; color:var(--hb-ink-2)}
.hb-head + .hb-course{margin-top:0}
.hb-ccard + .hb-ccard{margin-top:16px}
.hb-ccard h2 a:hover{color:var(--hb-link)}
.hb-ccard .hb-desc{-webkit-line-clamp:2}
.hb-ccard .hb-acts{padding-top:14px}

/* tutorials in progress, one row each */
.hb-rows{background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow); overflow:hidden}
.hb-row{
  display:grid; grid-template-columns:minmax(0,1fr) 200px auto; align-items:center; gap:24px;
  padding:16px 20px; border-top:1px solid var(--hb-line); transition:background-color .15s;
}
.hb-row:first-child{border-top:0}
.hb-row:hover{background:var(--hb-paper)}
.hb-row-main b{display:block; font:600 16px/22px var(--hb-display); letter-spacing:-.01em}
.hb-row-main .hb-meta{margin-top:2px; font-size:13px}
.hb-row-prog{display:flex; flex-direction:column; gap:6px; font-size:13px; color:var(--hb-ink-2); font-variant-numeric:tabular-nums}
.hb-bar{display:block; height:6px; border-radius:3px; background:var(--hb-line); overflow:hidden}
.hb-bar i{display:block; height:100%; border-radius:3px; background:var(--hb-cyan)}
.hb-row:hover .hb-btn:not(.primary){border-color:var(--hb-ink)}

/* a closed course */
.hb-next{margin-top:14px; font-size:14px; color:var(--hb-ink-2)}
.hb-next b{font-weight:600; color:var(--hb-ink)}
.hb-proto{display:inline-block; margin-left:6px; padding:1px 8px; border:1px dashed var(--hb-line-strong); border-radius:999px; font-size:12px}

/* breadcrumbs inside the new shell */
.shell .crumbs{font-family:var(--hb-font); font-size:13px}
.shell .crumbs a{color:var(--hb-ink-2)}
.shell .crumbs a:hover{color:var(--hb-link)}
.shell .crumbs .here{color:var(--hb-ink)}

@media (max-width:820px){
  .hb-row{grid-template-columns:minmax(0,1fr); gap:10px; padding:16px}
  .hb-row .hb-btn{justify-self:start}
}
@media (max-width:640px){
  .hb-pagehead h1{font-size:28px; line-height:34px}
}

/* ---------- a course page ---------- */
.hb-pagehead .hb-meta{margin-top:8px}
.hb-lede{margin-top:10px; max-width:68ch; font-size:16px; line-height:1.6}
.hb-cgrid{display:grid; grid-template-columns:minmax(0,1fr) 280px; gap:32px; align-items:start; margin-top:36px}
.hb-h2{margin-bottom:14px; font-size:22px; line-height:28px; font-weight:700; letter-spacing:-.03em}
.hb-parts{display:flex; flex-direction:column; gap:12px; margin:0; padding:0; list-style:none}
.hb-part{
  padding:20px 24px; background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px;
  box-shadow:var(--hb-shadow); scroll-margin-top:calc(var(--hb-strip) + 20px);
}
.hb-part.here{border-color:var(--hb-cyan); box-shadow:0 0 0 1px var(--hb-cyan), var(--hb-shadow)}
.hb-part-head{display:flex; align-items:flex-start; gap:16px}
.hb-pnum{
  flex:0 0 44px; display:inline-flex; align-items:center; gap:8px; padding-top:1px;
  font:700 16px/24px var(--hb-display); font-variant-numeric:tabular-nums;
}
.hb-part h3{font-size:18px; line-height:24px; font-weight:600; letter-spacing:-.01em}
.hb-part h3 .hb-badge{margin-left:6px; vertical-align:2px; font-family:var(--hb-font); letter-spacing:0}
.hb-part-head p{margin-top:4px; max-width:62ch; color:var(--hb-ink-2)}
.hb-items{display:flex; flex-direction:column; margin:14px 0 0 60px; border-top:1px solid var(--hb-line)}
.hb-item{
  display:flex; align-items:center; gap:12px; min-height:48px; padding:10px 4px;
  border-bottom:1px solid var(--hb-line); color:var(--hb-ink); font-weight:500;
}
.hb-item:last-child{border-bottom:0}
.hb-item svg{width:18px; height:18px; flex:0 0 18px; color:var(--hb-cyan)}
.hb-item .t{flex:1 1 auto; min-width:0}
.hb-item:hover .t{color:var(--hb-link); text-decoration:underline; text-underline-offset:3px}
.hb-item .k{flex:0 0 auto; font-size:13px; color:var(--hb-ink-2); white-space:nowrap}
.hb-item .s{flex:0 0 auto; display:inline-flex; align-items:center; gap:4px; font-size:13px; color:var(--hb-ink-2); white-space:nowrap}
.hb-item .s.done{color:var(--hb-ok); font-weight:600}
.hb-item .s svg{width:14px; height:14px; flex-basis:14px; color:inherit}
.hb-side{position:sticky; top:calc(var(--hb-strip) + 24px)}
.hb-sidecard{padding:20px; background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow)}
.hb-sidecard h2{margin-bottom:8px; font-size:16px; line-height:22px; font-weight:600}
.hb-sidecard ul{margin:0 0 14px; padding:0; list-style:none}
.hb-sidecard li button{
  width:100%; display:flex; align-items:center; gap:10px; min-height:40px; padding:0 8px;
  border:0; border-radius:8px; background:none; text-align:left;
  color:var(--hb-ink-2); font:500 15px var(--hb-font); transition:background-color .15s, color .15s;
}
.hb-sidecard li button:hover{background:var(--hb-paper); color:var(--hb-ink)}
.hb-sidecard li svg{width:18px; height:18px; flex:0 0 18px; color:var(--hb-cyan)}
.hb-sidecard li b{margin-left:auto; color:var(--hb-ink); font-variant-numeric:tabular-nums}
.hb-sidecard .hb-btn{width:100%; justify-content:center}
.hb-sidecard .hb-meta{margin-top:12px; font-size:13px}
@media (max-width:1080px){
  .hb-cgrid{grid-template-columns:minmax(0,1fr); gap:24px}
  .hb-side{position:static; order:-1}
}
@media (max-width:1023px){
  .hb-part{scroll-margin-top:calc(var(--hb-strip) + 76px)}
}
@media (max-width:640px){
  .hb-part{padding:18px}
  .hb-part-head{gap:10px}
  .hb-pnum{flex-basis:36px}
  .hb-items{margin-left:0}
  .hb-item{flex-wrap:wrap; row-gap:2px}
  .hb-item .t{flex-basis:calc(100% - 30px)}
  .hb-item .s, .hb-item .k{padding-left:30px}
  .hb-item .s + .k{padding-left:0}
}

/* ---------- a resource: tutorial, guide or prompt ---------- */
.hb-doc-grid{display:grid; grid-template-columns:minmax(0,1fr) 300px; gap:40px; align-items:start}
.hb-doc{min-width:0; max-width:760px}
.hb-res .hb-pagehead h1{text-wrap:balance}
.hb-inline{color:var(--hb-link) !important; font-weight:500}
.hb-inline:hover{text-decoration:underline !important; text-underline-offset:3px}
.hb-doc > section, .hb-doc > .hb-outcome{margin-top:32px}
.hb-doc > section.hb-note{margin-top:24px}
.hb-doc h2{font-size:24px; line-height:30px; font-weight:700; letter-spacing:-.03em; margin-bottom:10px}
.hb-doc .hb-head h2{margin-bottom:0}
.hb-doc section > h2:not(:first-child){margin-top:40px}
.hb-doc h3{margin:28px 0 8px; font-size:19px; line-height:26px; font-weight:600; letter-spacing:-.01em}
.hb-doc h2, .hb-doc h3, .hb-doc .hb-step{scroll-margin-top:calc(var(--hb-strip) + 20px)}
.hb-doc p{max-width:68ch; font-size:16px; line-height:1.65}
.hb-doc p + p{margin-top:12px}
.hb-doc .hb-desc{font-size:15px}
.hb-doc strong{font-weight:600}
.hb-doc p a:not(.hb-inline){color:var(--hb-link); text-decoration:underline; text-underline-offset:3px}
.hb-doc ul, .hb-doc ol:not(.hb-steps):not(.hb-toc){margin:10px 0; padding-left:22px}
.hb-outcome{display:flex; gap:12px; padding:16px 20px; border-radius:12px; background:var(--hb-tint); font-size:16px; line-height:1.6}
.hb-outcome svg{width:22px; height:22px; flex:0 0 22px; margin-top:2px; color:var(--hb-cyan)}
.hb-outcome b{font-weight:600}

.hb-prompt{margin:16px 0; overflow:hidden; background:var(--hb-surface); border:1px solid var(--hb-line-strong); border-radius:12px; box-shadow:var(--hb-shadow)}
.hb-prompt-head{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:10px 12px 10px 20px; background:var(--hb-tint); border-bottom:1px solid var(--hb-line);
}
.hb-prompt-head > span{font-size:14px; font-weight:600}
.hb-prompt-text{padding:18px 20px; white-space:pre-wrap; overflow-wrap:anywhere; font:400 16px/1.65 var(--hb-font)}
.hb-prompt-text b{font-weight:700}
.hb-prompt-list{list-style:none; margin:0; padding:0}
.hb-prompt-list li+li{border-top:1px solid var(--hb-line)}
.hb-prompt-list .hb-prompt-text{padding:0 20px 16px 56px}
.hb-prompt-item{display:flex; align-items:center; gap:12px; padding:14px 16px 6px 20px}
.hb-prompt-item .n{flex:none; width:24px; height:24px; border-radius:50%; display:grid; place-items:center; background:var(--hb-tint); color:var(--hb-link); font-size:13px; font-weight:600}
.hb-prompt-item .t{flex:1; font-weight:600; color:var(--hb-ink)}
.hb-btn.sm{padding:4px 10px; font-size:13px}
@media (max-width:640px){ .hb-prompt-list .hb-prompt-text{padding:0 16px 14px} }
.hb-blank{padding:1px 4px; border-radius:4px; background:var(--hb-tint); color:var(--hb-link); font-weight:600}
.hb-doc .hb-prompt-note{padding:0 20px 16px; font-size:14px; color:var(--hb-ink-2)}

.hb-table{margin:16px 0; overflow-x:auto; background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px}
.hb-table table{width:100%; border-collapse:collapse; font-size:15px; line-height:1.5}
.hb-table th, .hb-table td{padding:12px 16px; text-align:left; vertical-align:top; border-top:1px solid var(--hb-line); border-bottom:0}
.hb-table th{
  font:600 15px/1.5 var(--hb-font); text-transform:none; letter-spacing:normal; white-space:normal;
  color:var(--hb-ink); background:var(--hb-surface);
}
.hb-table thead th{border-top:0; background:var(--hb-paper); font-size:14px}
.hb-table tbody tr:hover{background:transparent}
.hb-table td{color:var(--hb-ink-2)}

.hb-steps{display:flex; flex-direction:column; gap:14px; margin:0; padding:0; list-style:none}
.hb-step{padding:20px 24px; background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow)}
.hb-step.next{border-color:var(--hb-cyan); box-shadow:0 0 0 1px var(--hb-cyan), var(--hb-shadow)}
.hb-step-head{display:flex; align-items:flex-start; gap:14px}
.hb-step-n{
  flex:0 0 32px; width:32px; height:32px; display:grid; place-items:center; border-radius:50%;
  border:1.5px solid var(--hb-line-strong); font:700 15px/1 var(--hb-display); font-variant-numeric:tabular-nums;
}
.hb-step-n svg{width:16px; height:16px}
.hb-step.done .hb-step-n{background:var(--hb-ok); border-color:var(--hb-ok); color:var(--hb-surface)}
.hb-doc .hb-step h3{flex:1 1 auto; margin:2px 0 0}
.hb-step-t{flex:0 0 auto; display:inline-flex; align-items:center; gap:6px; margin-top:6px; font-size:13px; color:var(--hb-ink-2); white-space:nowrap}
.hb-step-t svg{width:14px; height:14px}
.hb-step-body{margin:10px 0 0 46px}
.hb-step-body h4{margin:18px 0 6px; font:600 15px/22px var(--hb-font)}
.hb-step-foot{margin:16px 0 0 46px}
.hb-step .hb-btn[aria-pressed="true"]{border-color:var(--hb-ok); color:var(--hb-ok)}

.hb-doc-side{position:sticky; top:calc(var(--hb-strip) + 24px); display:flex; flex-direction:column; gap:16px}
.hb-sidecard h3{margin:16px 0 0; font-size:14px; line-height:20px; font-weight:600}
.hb-prog{font-size:14px; color:var(--hb-ink-2); margin-bottom:8px}
.hb-prog b{font-size:16px; color:var(--hb-ink)}
.hb-toc{display:flex; flex-direction:column; margin:12px 0 0; padding:0; list-style:none}
.hb-toc a{display:flex; align-items:flex-start; gap:10px; padding:8px; border-radius:8px; color:var(--hb-ink-2); font-size:14px; line-height:20px}
.hb-toc a:hover{background:var(--hb-paper); color:var(--hb-ink)}
.hb-toc .n{flex:0 0 18px; display:inline-flex; justify-content:center; font-weight:600; font-variant-numeric:tabular-nums; color:var(--hb-ink)}
.hb-toc .n svg{width:16px; height:16px; margin-top:2px}
.hb-toc a.done .n{color:var(--hb-ok)}
.hb-toc a.next{background:var(--hb-tint); color:var(--hb-ink); font-weight:600}
.hb-side-note{margin-top:12px; font-size:13px; color:var(--hb-ink-2)}
.hb-cards.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.hb-stepbar{display:none}

@media (max-width:1080px){
  .hb-doc-grid{grid-template-columns:minmax(0,1fr)}
  .hb-doc{max-width:none}
  .hb-doc-side{display:none}
  .hb-stepbar{
    display:block; position:sticky; top:var(--hb-strip); z-index:30; margin-top:20px;
    background:var(--hb-surface); border:1px solid var(--hb-line); border-radius:12px; box-shadow:var(--hb-shadow);
  }
  .hb-stepbar summary{
    display:flex; align-items:center; justify-content:space-between; gap:12px; min-height:52px; padding:0 16px;
    list-style:none; cursor:pointer; font-weight:600; line-height:1.3;
  }
  .hb-stepbar summary::-webkit-details-marker{display:none}
  .hb-stepbar summary svg{width:18px; height:18px; flex:0 0 18px; transition:transform .15s}
  .hb-stepbar[open] summary svg{transform:rotate(180deg)}
  .hb-stepbar .hb-toc{max-height:50vh; overflow:auto; margin:0; padding:0 8px 8px}
  .hb-doc h2, .hb-doc h3, .hb-doc .hb-step{scroll-margin-top:calc(var(--hb-strip) + 72px)}
}
@media (max-width:1023px){
  .hb-stepbar{top:calc(var(--hb-strip) + 60px)}
  .hb-doc h2, .hb-doc h3, .hb-doc .hb-step{scroll-margin-top:calc(var(--hb-strip) + 132px)}
}
@media (max-width:640px){
  .hb-doc h2{font-size:21px; line-height:27px}
  .hb-step{padding:18px}
  .hb-step-head{flex-wrap:wrap; gap:10px 12px}
  .hb-step-t{order:3; flex-basis:100%; margin:0 0 0 44px}
  .hb-step-body, .hb-step-foot{margin-left:0}
  .hb-prompt-head{padding:10px 10px 10px 16px}
  .hb-prompt-text{padding:16px}
  .hb-cards.two{grid-template-columns:minmax(0,1fr)}
}

/* ---------- laptops below 1360 ---------- */
@media (max-width:1360px){
  .hb-tiles{gap:16px}
  .hb-tile{padding:12px 16px; gap:12px}
}
@media (max-width:1180px){
  .hb-tiles{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hb-cards{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- tablets and phones: a slim top bar, the four places in a tab bar ---------- */
@media (max-width:1023px){
  .shell{grid-template-columns:minmax(0,1fr)}
  .sidebar{display:none}
  .mbar{
    display:flex; align-items:center; justify-content:space-between; gap:12px;
    position:sticky; top:var(--hb-strip); z-index:40; min-height:60px; padding:8px 16px;
    background:var(--hb-surface); border-bottom:1px solid var(--hb-line); font-family:var(--hb-font);
  }
  .mbar .sb-brand{padding:0; gap:4px}
  .mbar .sb-brand img{width:118px}
  .mbar .sb-acad{font-size:10px}
  .mbar-acts{display:flex; align-items:center; gap:8px}
  .mb-btn{
    width:44px; height:44px; display:grid; place-items:center; border-radius:10px;
    border:1px solid var(--hb-line); background:var(--hb-surface); color:var(--hb-ink);
  }
  .mb-btn:hover{border-color:var(--hb-line-strong); text-decoration:none}
  .mb-btn svg{width:20px; height:20px}
  .mb-av{width:44px; height:44px; flex-basis:44px}
  .mb-av:hover{text-decoration:none}
  .shell .page{padding:20px 16px 104px}
  .tabs{
    display:grid; grid-template-columns:repeat(4,1fr); position:fixed; left:0; right:0; bottom:0; z-index:50;
    padding:6px 4px calc(6px + env(safe-area-inset-bottom));
    background:var(--hb-surface); border-top:1px solid var(--hb-line); font-family:var(--hb-font);
  }
  .tabs a{
    display:flex; flex-direction:column; align-items:center; justify-content:center; gap:4px; min-height:52px;
    border-radius:10px; color:var(--hb-ink-2); font-size:12px; font-weight:500; line-height:1.2;
  }
  .tabs a:hover{text-decoration:none; color:var(--hb-ink)}
  .tabs a[aria-current="page"]{color:var(--hb-ink); font-weight:600}
  .tabs a[aria-current="page"] svg{color:var(--hb-cyan)}
  .tabs svg{width:22px; height:22px}
}
@media (max-width:640px){
  .hb-band{padding:24px 20px 20px}
  .hb-band h1{font-size:28px; line-height:34px}
  .hb-band .contours{width:70%}
  .hb-tiles{gap:10px; margin-top:16px}
  .hb-tile{min-height:56px; padding:10px 14px; gap:10px; font-size:15px}
  .hb-course{grid-template-columns:minmax(0,1fr); gap:14px; margin-top:16px; padding:18px}
  .hb-course > div:last-child{justify-self:start}
  .hb-cards{grid-template-columns:minmax(0,1fr); gap:14px}
  .hb-card{padding:20px}
  .hb-head{flex-direction:column; align-items:flex-start; gap:2px; margin:30px 0 12px}
  .hb-head h2{font-size:20px}
  .hb-note{padding:18px}
}