/* ============================================================
   ownExam — shared design system
   Type:  Archivo (UI/display) · Newsreader (question stems, prose)
          JetBrains Mono (exam codes, scores, nav paths)
   Color: deep teal accent on green-biased neutrals; pass/fail
          semantics borrowed from real score reports
   ============================================================ */

:root{
  --ground:#F6F7F5;
  --surface:#FFFFFF;
  --surface-2:#EFF1EE;
  --line:#DCE0DA;
  --line-soft:#E8EBE5;
  --ink:#14201E;
  --ink-2:#5A6560;
  --accent:#0B6B63;
  --accent-soft:#E2EFEC;
  --accent-ink:#08514B;
  --pass:#1F7A46;  --pass-bg:#E6F3EA;  --pass-line:#A9D2B8;
  --fail:#A8321F;  --fail-bg:#FBEBE7;  --fail-line:#EDBBAF;
  --warn:#8A6410;  --warn-bg:#FBF1DA;  --warn-line:#E3CB92;
  --cue-term:#D8E7E4;  --cue-term-ink:#0A5751; --cue-term-line:#8FC0BA;
  --cue-scene:#F7E6C4; --cue-scene-ink:#6F5210; --cue-scene-line:#DCBE7E;
  --shadow:0 1px 2px rgba(20,32,30,.05), 0 10px 30px rgba(20,32,30,.05);
  --r:12px;

  --f-ui:'Archivo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --f-read:'Newsreader', Georgia, 'Times New Roman', serif;
  --f-mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ground:#0E1413;
    --surface:#161E1C;
    --surface-2:#1E2725;
    --line:#2C3835;
    --line-soft:#232E2B;
    --ink:#E6EBE8;
    --ink-2:#98A5A0;
    --accent:#4FBFAF;
    --accent-soft:#12302C;
    --accent-ink:#7ED6C7;
    --pass:#5FCB8B; --pass-bg:#10261A; --pass-line:#2C5E40;
    --fail:#F0907C; --fail-bg:#2A1512; --fail-line:#66332A;
    --warn:#E0BC6A; --warn-bg:#2A2110; --warn-line:#5A4820;
    --cue-term:#123B37;  --cue-term-ink:#8FDDD1; --cue-term-line:#2A6660;
    --cue-scene:#33290F; --cue-scene-ink:#EBCB86; --cue-scene-line:#6A5525;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"]{
  --ground:#0E1413;
  --surface:#161E1C;
  --surface-2:#1E2725;
  --line:#2C3835;
  --line-soft:#232E2B;
  --ink:#E6EBE8;
  --ink-2:#98A5A0;
  --accent:#4FBFAF;
  --accent-soft:#12302C;
  --accent-ink:#7ED6C7;
  --pass:#5FCB8B; --pass-bg:#10261A; --pass-line:#2C5E40;
  --fail:#F0907C; --fail-bg:#2A1512; --fail-line:#66332A;
  --warn:#E0BC6A; --warn-bg:#2A2110; --warn-line:#5A4820;
  --cue-term:#123B37;  --cue-term-ink:#8FDDD1; --cue-term-line:#2A6660;
  --cue-scene:#33290F; --cue-scene-ink:#EBCB86; --cue-scene-line:#6A5525;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.3);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--ground);
  color:var(--ink);
  font:400 16px/1.6 var(--f-ui);
  -webkit-font-smoothing:antialiased;
}
html{scroll-behavior:smooth}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;box-shadow:0 0 0 5px color-mix(in srgb, var(--accent) 22%, transparent)}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}

.wrap{max-width:1000px;margin:0 auto;padding:0 20px}
.narrow{max-width:820px}
.hidden{display:none!important}
/* An author `display` (.pill, .row …) otherwise beats the browser's own rule for
   the hidden attribute, leaving empty elements visible as stray boxes. */
[hidden]{display:none!important}

/* ---------- type ---------- */
h1,h2,h3,h4{font-family:var(--f-ui);text-wrap:balance;margin:0}
h1{font-size:clamp(30px,4.4vw,46px);font-weight:700;letter-spacing:-.028em;line-height:1.1}
h2{font-size:24px;font-weight:600;letter-spacing:-.018em;line-height:1.25}
h3{font-size:19px;font-weight:600;letter-spacing:-.012em}
.eyebrow{
  font-family:var(--f-mono);font-size:11.5px;font-weight:600;
  text-transform:uppercase;letter-spacing:.14em;color:var(--ink-2);
}
.lede{font-family:var(--f-read);font-size:19.5px;line-height:1.62;color:var(--ink-2);max-width:60ch}
.prose{font-family:var(--f-read);font-size:17px;line-height:1.68;max-width:66ch;color:var(--ink-2)}
.prose strong{color:var(--ink);font-weight:600}
.prose a{color:var(--accent)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.num{font-variant-numeric:tabular-nums}

/* ---------- controls ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font:600 15px/1 var(--f-ui);cursor:pointer;border-radius:var(--r);
  padding:12px 18px;border:1px solid var(--line);background:var(--surface);color:var(--ink);
  transition:border-color .14s, background .14s, transform .12s, box-shadow .14s;
  text-decoration:none;
}
.btn:hover{border-color:var(--accent);transform:translateY(-1px)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 6px 18px -8px color-mix(in srgb, var(--accent) 65%, transparent)}
.btn.primary:hover{filter:brightness(1.08);box-shadow:0 10px 24px -8px color-mix(in srgb, var(--accent) 75%, transparent)}
.btn.sm{padding:8px 13px;font-size:13.5px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.spread{justify-content:space-between}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow)}
.card + .card{margin-top:14px}

.code-badge{
  display:inline-block;font-family:var(--f-mono);font-size:12.5px;font-weight:600;
  letter-spacing:.02em;padding:3px 8px;border-radius:5px;
  background:var(--accent-soft);color:var(--accent-ink);border:1px solid transparent;
  white-space:nowrap;
}
.tag{
  display:inline-block;font-family:var(--f-mono);font-size:11px;font-weight:600;
  text-transform:uppercase;letter-spacing:.08em;padding:2px 7px;border-radius:4px;
  border:1px solid var(--line);color:var(--ink-2);background:var(--surface-2);
}
.tag.live{color:var(--pass);border-color:var(--pass-line);background:var(--pass-bg)}
.tag.soon{color:var(--warn);border-color:var(--warn-line);background:var(--warn-bg)}

/* ---------- site chrome ---------- */
.masthead{
  border-bottom:1px solid var(--line);
  background:color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter:saturate(1.4) blur(10px);
  -webkit-backdrop-filter:saturate(1.4) blur(10px);
  position:sticky;top:0;z-index:30;
}
.masthead .inner{display:flex;align-items:center;gap:16px;padding:14px 20px;max-width:1000px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand .logo{
  display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;
  width:27px;height:27px;border-radius:8px;background:var(--accent);color:#fff;
  font:700 12px var(--f-mono);letter-spacing:-.02em;
  box-shadow:0 4px 10px -4px color-mix(in srgb, var(--accent) 70%, transparent);
}
.brand .mark{
  font-family:var(--f-ui);font-weight:700;font-size:19px;letter-spacing:-.03em;
}
.brand .mark span{color:var(--accent)}
.brand .tagline{font-family:var(--f-mono);font-size:11px;color:var(--ink-2);letter-spacing:.06em}
.masthead nav{margin-left:auto;display:flex;gap:6px;align-items:center}
.masthead nav a{
  font-size:14px;color:var(--ink-2);text-decoration:none;padding:7px 10px;border-radius:7px;
}
.masthead nav a:hover{color:var(--ink);background:var(--surface-2)}

.foot{border-top:1px solid var(--line);margin-top:64px;padding:28px 0 56px;color:var(--ink-2);font-size:13.5px;line-height:1.7}
.foot a{color:var(--accent)}
.foot .wrap{display:grid;gap:16px}

/* ---------- landing ---------- */
.hero{padding:64px 0 44px;display:grid;gap:20px;position:relative}
.hero::before{
  content:'';position:absolute;top:-60px;right:-140px;width:460px;height:460px;
  background:radial-gradient(circle, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%);
  pointer-events:none;z-index:0;
}
.hero > *{position:relative;z-index:1}
.hero h1 em{font-family:var(--f-read);font-style:italic;font-weight:500;color:var(--accent)}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}

.pledge{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--surface)}
.pledge > div{padding:18px 20px;border-right:1px solid var(--line);transition:background .16s}
.pledge > div:hover{background:var(--surface-2)}
.pledge > div:last-child{border-right:0}
.pledge h3{font-size:15px;margin-bottom:5px}
.pledge p{margin:0;font-size:14px;line-height:1.55;color:var(--ink-2)}
@media (max-width:720px){
  .pledge > div{border-right:0;border-bottom:1px solid var(--line)}
  .pledge > div:last-child{border-bottom:0}
}

.section{padding:44px 0 0}
.section-head{display:flex;align-items:baseline;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.section-head .eyebrow{margin-left:auto}

/* exam catalogue — spec-sheet rows, not marketing cards */
.catalogue{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--surface)}
.exam-row{
  display:grid;
  grid-template-columns:minmax(0,1fr) 190px 128px;
  gap:22px;align-items:center;
  padding:19px 22px;border-bottom:1px solid var(--line);
  text-decoration:none;color:inherit;
  transition:background .14s, box-shadow .14s;
  box-shadow:inset 0 0 0 var(--accent);
}
.exam-row:last-child{border-bottom:0}
.exam-row:hover{background:var(--surface-2);box-shadow:inset 3px 0 0 var(--accent)}
.exam-row.disabled{pointer-events:none;opacity:.62}
.exam-id{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:5px}
.exam-name{font-size:17.5px;font-weight:600;letter-spacing:-.012em;line-height:1.3}
.exam-meta{font-size:13.5px;color:var(--ink-2);margin-top:4px}
.exam-meta .dot{opacity:.45;margin:0 6px}

/* weighting rail: the objective breakdown, rendered as an instrument */
.rail{display:flex;height:7px;border-radius:99px;overflow:hidden;background:var(--surface-2);gap:1.5px}
.rail i{display:block;height:100%}
.rail-key{display:flex;flex-wrap:wrap;gap:10px;margin-top:7px;font-size:11.5px;color:var(--ink-2);font-family:var(--f-mono)}
.rail-key span{display:flex;align-items:center;gap:5px}
.rail-key b{width:7px;height:7px;border-radius:2px;display:block}
.counts{text-align:right;font-family:var(--f-mono);font-size:13px;color:var(--ink-2);line-height:1.7;font-variant-numeric:tabular-nums}
.counts b{display:block;font-size:21px;color:var(--ink);font-weight:600;letter-spacing:-.02em}
@media (max-width:760px){
  .exam-row{grid-template-columns:1fr;gap:14px}
  .counts{text-align:left}
}

.verified{
  display:inline-flex;align-items:center;gap:6px;font-family:var(--f-mono);
  font-size:11.5px;color:var(--ink-2);
}
.verified i{width:6px;height:6px;border-radius:99px;background:var(--pass);display:block;flex:0 0 auto}

.note-panel{
  border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:var(--r);padding:18px 22px;background:var(--surface);
}
.note-panel h3{margin-bottom:7px}
.note-panel p{margin:0;font-size:15px;color:var(--ink-2);line-height:1.62}

/* ---------- forms ---------- */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;font-weight:600;color:var(--ink)}
.field input{
  font:400 15px/1.4 var(--f-ui);color:var(--ink);background:var(--surface-2);
  border:1px solid var(--line);border-radius:9px;padding:11px 13px;
  transition:border-color .14s;
}
.field input:focus{border-color:var(--accent)}
.form-msg{font-size:13.5px;border-radius:9px;padding:10px 13px;margin-bottom:14px}
.form-msg.error{color:var(--fail);background:var(--fail-bg);border:1px solid var(--fail-line)}
.form-msg.ok{color:var(--pass);background:var(--pass-bg);border:1px solid var(--pass-line)}
.form-msg.note{color:var(--ink-2);background:var(--surface-2);border:1px solid var(--line)}

/* ---------- exam app ---------- */
.exam-bar{border-bottom:1px solid var(--line);background:var(--surface);position:sticky;top:0;z-index:20}
.exam-bar .inner{display:flex;align-items:center;gap:12px;padding:11px 20px;max-width:1000px;margin:0 auto}
.exam-bar .back{font-size:13.5px;color:var(--ink-2);text-decoration:none;padding:6px 9px;border-radius:7px;white-space:nowrap}
.exam-bar .back:hover{background:var(--surface-2);color:var(--ink)}
.exam-bar .title{font-size:14.5px;font-weight:600;letter-spacing:-.01em;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.exam-bar .right{margin-left:auto;display:flex;gap:8px;align-items:center}

.app{padding:26px 0 70px}

.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:9px}
.stat{background:var(--surface-2);border:1px solid var(--line-soft);border-radius:9px;padding:12px 13px}
.stat b{display:block;font-size:22px;font-weight:600;letter-spacing:-.024em;line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{font-size:12px;color:var(--ink-2);line-height:1.4;display:block;margin-top:2px}

.opt-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(196px,1fr));gap:9px;margin:6px 0 18px}
.pick{
  border:1px solid var(--line);background:var(--surface-2);border-radius:9px;padding:13px 14px;
  cursor:pointer;text-align:left;font:inherit;color:inherit;transition:border-color .14s,background .14s
}
.pick strong{display:block;font-size:14.5px;font-weight:600;margin-bottom:3px}
.pick span{font-size:12.5px;color:var(--ink-2);line-height:1.45;display:block}
.pick[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-soft)}
.pick:hover:not(:disabled){border-color:var(--accent)}
.pick:disabled{opacity:.45;cursor:not-allowed}

.toggle{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);cursor:pointer;margin-bottom:9px}
.toggle input{margin-top:4px;accent-color:var(--accent);width:16px;height:16px;flex:0 0 auto}
.toggle span{font-size:13.5px;color:var(--ink-2)}
.toggle b{display:block;color:var(--ink);font-size:14.5px;font-weight:600}

mark{border-radius:4px;padding:1px 4px;margin:0 -1px;font-weight:inherit}
mark.term{background:var(--cue-term);color:var(--cue-term-ink);box-shadow:inset 0 -2px 0 var(--cue-term-line)}
mark.scene{background:var(--cue-scene);color:var(--cue-scene-ink);box-shadow:inset 0 -2px 0 var(--cue-scene-line)}
.legend{font-size:12.5px;color:var(--ink-2);display:flex;gap:16px;flex-wrap:wrap;align-items:center}

.qmeta{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12.5px;color:var(--ink-2);flex-wrap:wrap;font-family:var(--f-mono)}
.progress{height:5px;background:var(--surface-2);border-radius:99px;overflow:hidden;margin-top:12px}
.progress i{display:block;height:100%;background:var(--accent);width:0;transition:width .28s}
.domain-chip{display:inline-block;font-family:var(--f-mono);font-size:11px;font-weight:600;padding:2px 8px;border-radius:4px;border:1px solid;text-transform:uppercase;letter-spacing:.06em}

.qtext{font-family:var(--f-read);font-size:21px;line-height:1.52;font-weight:500;margin:18px 0 18px;letter-spacing:-.005em}
.answers{display:flex;flex-direction:column;gap:8px}
.ans{
  display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;
  border:1px solid var(--line);background:var(--surface-2);border-radius:9px;padding:13px 15px;
  font:400 15.5px/1.5 var(--f-ui);color:inherit;cursor:pointer;transition:border-color .12s,background .12s
}
.ans:hover:not(.locked){border-color:var(--accent)}
.ans .key{
  flex:0 0 23px;height:23px;border-radius:5px;background:var(--line);color:var(--ink-2);
  display:flex;align-items:center;justify-content:center;font:600 12px var(--f-mono);margin-top:1px
}
.ans[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-soft)}
.ans[aria-pressed="true"] .key{background:var(--accent);color:#fff}
.ans.correct{border-color:var(--pass-line);background:var(--pass-bg)}
.ans.correct .key{background:var(--pass);color:#fff}
.ans.wrong{border-color:var(--fail-line);background:var(--fail-bg)}
.ans.wrong .key{background:var(--fail);color:#fff}
.ans.locked{cursor:default}

.explain{margin-top:16px;border-radius:9px;padding:17px 19px;border:1px solid var(--line);background:var(--surface-2)}
.explain.ok{border-color:var(--pass-line);background:var(--pass-bg)}
.explain.no{border-color:var(--fail-line);background:var(--fail-bg)}
.explain p{margin:0 0 10px}
.explain p:last-child{margin-bottom:0}
.explain .body{font-family:var(--f-read);font-size:16.5px;line-height:1.62}
.verdict{font:700 15px var(--f-ui);margin:0 0 8px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;letter-spacing:-.01em}
.verdict.ok{color:var(--pass)} .verdict.no{color:var(--fail)}
.topicline{font-family:var(--f-mono);font-size:11.5px;color:var(--ink-2);margin:0 0 10px;text-transform:uppercase;letter-spacing:.07em}
.topicline b{color:var(--ink)}
.why{margin:13px 0 0;padding:12px 0 0;list-style:none;border-top:1px solid rgba(128,128,128,.2)}
.why li{font-size:14.5px;line-height:1.55;margin-bottom:7px;color:var(--ink-2);display:flex;gap:8px}
.why li:last-child{margin-bottom:0}
.why li b{color:var(--ink);font-weight:600;flex:0 0 auto;font-family:var(--f-mono);font-size:12.5px;padding-top:2px}
.why .head{color:var(--ink);font-weight:600;font-size:13px;margin-bottom:9px;font-family:var(--f-ui)}
.pill{display:inline-block;font-family:var(--f-mono);font-size:11px;font-weight:600;padding:2px 7px;border-radius:4px;border:1px solid var(--line);color:var(--ink-2);background:var(--surface)}

/* score report */
.score-top{display:flex;gap:26px;align-items:center;flex-wrap:wrap}
.dial{position:relative;width:128px;height:128px;flex:0 0 128px}
.dial svg{transform:rotate(-90deg)}
.dial .val{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.dial .val b{font:600 29px var(--f-ui);letter-spacing:-.035em;line-height:1;font-variant-numeric:tabular-nums}
.dial .val span{font-family:var(--f-mono);font-size:11px;color:var(--ink-2);margin-top:4px}
.verdict-box{flex:1 1 250px;min-width:230px}
.verdict-box .big{font:700 23px var(--f-ui);letter-spacing:-.025em;margin-bottom:5px}
.dbar{margin-bottom:14px}
.dbar .lbl{display:flex;justify-content:space-between;font-size:14px;margin-bottom:5px;gap:12px}
.dbar .lbl span:last-child{color:var(--ink-2);white-space:nowrap;font-family:var(--f-mono);font-size:12.5px;font-variant-numeric:tabular-nums}
.track{display:block;height:8px;background:var(--surface-2);border-radius:99px;overflow:hidden}
.track i{display:block;height:100%;border-radius:99px}

.rev{border:1px solid var(--line);border-radius:9px;padding:17px 19px;margin-bottom:11px;background:var(--surface-2)}
.rev .qt{font-family:var(--f-read);font-size:18px;font-weight:500;margin:9px 0 12px;line-height:1.5}
.pickline{font-size:14.5px;margin:0 0 6px;display:flex;gap:8px;align-items:flex-start}
.pickline .lab{flex:0 0 auto;font:600 10.5px var(--f-mono);text-transform:uppercase;letter-spacing:.07em;padding:3px 7px;border-radius:4px;margin-top:2px}
.lab.you{background:var(--fail-bg);color:var(--fail);border:1px solid var(--fail-line)}
.lab.right{background:var(--pass-bg);color:var(--pass);border:1px solid var(--pass-line)}

.tline{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid var(--line-soft);font-size:14.5px}
.tline:last-child{border-bottom:none}
.tline .nm{flex:1 1 auto;min-width:0}
.tline .nm i{display:block;font-style:normal;font-size:11.5px;color:var(--ink-2);font-family:var(--f-mono)}
.tline .tr{flex:0 0 84px}
.tline .pc{flex:0 0 92px;text-align:right;font-family:var(--f-mono);font-size:12.5px;color:var(--ink-2);white-space:nowrap;font-variant-numeric:tabular-nums}

.hist{width:100%;border-collapse:collapse;font-size:14px}
.hist th{text-align:left;font:600 11px var(--f-mono);text-transform:uppercase;letter-spacing:.08em;color:var(--ink-2);padding:0 10px 8px 0;border-bottom:1px solid var(--line)}
.hist td{padding:9px 10px 9px 0;border-bottom:1px solid var(--line-soft)}
.hist tr:last-child td{border-bottom:none}
.hist .sc{font-family:var(--f-mono);font-weight:600;font-variant-numeric:tabular-nums}

.warn-note{font-size:13.5px;color:var(--ink-2);background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:9px;padding:12px 14px;margin:0 0 14px;line-height:1.55}

/* mock admin portal */
.portal{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--surface-2);margin-top:4px}
.portal-bar{display:flex;align-items:center;gap:10px;padding:9px 14px;background:var(--hue);color:#fff;font:600 13.5px var(--f-ui)}
.portal-bar .grid{display:grid;grid-template-columns:repeat(3,3px);gap:2px;opacity:.85}
.portal-bar .grid i{width:3px;height:3px;background:#fff;border-radius:1px;display:block}
.portal-bar .url{margin-left:auto;font:400 11.5px var(--f-mono);opacity:.82}
.portal-body{display:flex;align-items:stretch;min-height:262px}
.rail-nav{flex:0 0 234px;border-right:1px solid var(--line);padding:8px 0;background:var(--surface);max-height:430px;overflow-y:auto}
.nav-item{
  display:flex;align-items:center;gap:8px;width:100%;text-align:left;
  font:400 13.5px/1.35 var(--f-ui);color:inherit;
  background:none;border:0;border-left:3px solid transparent;padding:7px 12px 7px 13px;cursor:pointer;
  transition:background .1s
}
.nav-item:hover:not(.locked){background:var(--accent-soft)}
.nav-item.child{padding-left:32px;font-size:13px;color:var(--ink-2)}
.nav-item.parent{font-weight:600}
.nav-item .caret{font-size:9px;opacity:.5;flex:0 0 auto}
.nav-item.hit{background:var(--pass-bg);border-left-color:var(--pass);color:var(--pass);font-weight:700}
.nav-item.miss{background:var(--fail-bg);border-left-color:var(--fail);color:var(--fail);font-weight:700}
.nav-item.locked{cursor:default}
.stage{flex:1 1 auto;padding:20px 22px;display:flex;flex-direction:column;justify-content:center;gap:10px;min-width:0}
.stage .hint{font-size:14px;color:var(--ink-2);line-height:1.5}
.stage .hint b{color:var(--ink);display:block;margin-bottom:4px;font-size:15px}
.crumb{font-size:14px;line-height:1.75;word-break:break-word}
.crumb .step{display:inline-block;background:var(--surface-2);border:1px solid var(--line);border-radius:6px;padding:3px 9px;font-family:var(--f-mono);font-size:12.5px}
.crumb .step.final{background:var(--pass-bg);border-color:var(--pass-line);color:var(--pass);font-weight:600}
.crumb .sep{color:var(--ink-2);margin:0 4px}
.nodedesc{font-size:14px;color:var(--ink-2);line-height:1.55;margin:0}
@media (max-width:640px){
  .portal-body{flex-direction:column}
  .rail-nav{flex:0 0 auto;width:100%;border-right:0;border-bottom:1px solid var(--line);max-height:290px}
  .stage{padding:16px}
}

kbd{font:600 11.5px var(--f-mono);background:var(--surface-2);border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;padding:1px 5px}

@media (max-width:520px){
  .hero{padding:40px 0 32px}
  .card{padding:17px}
  .qtext{font-size:19px}
  .tline .tr{flex:0 0 56px}
}