/* University of SEO: Virtual Lab practice labs (sandbox_catalog.php, sandbox_workspace.php, js/uos-lab.js). Uses the site tokens. */
.sbx{padding-bottom:64px}
.sbx-crumbs{margin-bottom:4px}
.sbx-hero{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:24px;align-items:end;padding:8px 0 22px}
.sbx-hero h1{font-size:var(--uos-fs-h1);line-height:var(--uos-lh-heading);font-weight:600;letter-spacing:var(--uos-ls-heading);margin:0 0 10px;color:var(--uos-ink)}
.sbx-hero p{margin:0;color:var(--uos-muted);max-width:62ch;line-height:1.6}
.sbx-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0}
.sbx-stats div{border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-surface-solid);padding:12px 14px}
.sbx-stats dt{font-size:.8rem;color:var(--uos-muted);font-weight:500}
.sbx-stats dd{margin:2px 0 0;font-size:1.6rem;font-weight:600;color:var(--uos-ink);font-variant-numeric:tabular-nums}
.sbx-stats dd small{font-size:.85rem;color:var(--uos-muted);font-weight:500}
.sbx-filters{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}
.sbx-chips{display:flex;flex-wrap:wrap;gap:8px}
.sbx-chips a{display:inline-flex;align-items:center;min-height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--uos-line-2);background:var(--uos-surface-solid);color:var(--uos-ink);font-size:.92rem;text-decoration:none}
.sbx-chips a:hover{border-color:var(--uos-ink)}
.sbx-chips a.is-on{background:var(--uos-accent);border-color:var(--uos-accent);color:var(--uos-on-accent);font-weight:600}
.sbx-chips-sm a{min-height:32px;font-size:.85rem;padding:0 12px}
.sbx-empty{color:var(--uos-muted);padding:24px 0}
.sbx-empty a{color:var(--uos-accent-text);font-weight:600;text-decoration:underline;text-underline-offset:.2em;margin-left:10px}
.sbx-topic{margin-top:30px}
.sbx-topic-head{display:flex;gap:16px;align-items:center;margin-bottom:14px}
.sbx-topic-art{flex:0 0 132px;aspect-ratio:240/140;border-radius:14px;background:var(--uos-canvas-2);border:1px solid var(--uos-line);padding:6px 8px 0}
.sbx-topic-head h2{font-size:1.35rem;margin:0 0 3px;color:var(--uos-ink)}
.sbx-topic-head p{margin:0 0 8px;color:var(--uos-muted);font-size:.95rem}
.sbx-topic-head small{color:var(--uos-muted);font-size:.82rem}
.sbx-bar{height:6px;width:min(320px,100%);border-radius:6px;background:var(--uos-line);overflow:hidden;margin-bottom:4px}
.sbx-bar span{display:block;height:100%;background:var(--uos-accent);border-radius:6px}
.sbx-tasks{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.sbx-tasks li{display:flex}
.sbx-task{display:flex;flex-direction:column;gap:6px;width:100%;padding:16px;border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-surface-solid);color:var(--uos-text);text-decoration:none;transition:border-color .15s ease}
.sbx-task:hover{border-color:var(--uos-line-2);color:var(--uos-text)}
.sbx-task:hover strong{text-decoration:underline;text-underline-offset:.2em}
.sbx-task.is-passed{border-color:rgba(var(--uos-accent-rgb),.55)}
.sbx-task strong{color:var(--uos-ink);font-size:1.03rem;line-height:1.35}
.sbx-task small{color:var(--uos-muted);font-size:.9rem;line-height:1.5}
.sbx-task-top{display:flex;justify-content:space-between;align-items:center;gap:8px}
.sbx-meta{font-size:.8rem;color:var(--uos-muted);font-variant-numeric:tabular-nums}
.sbx-pill{display:inline-flex;align-items:center;height:22px;padding:0 9px;border-radius:999px;font-size:.75rem;font-weight:600;border:1px solid var(--uos-line-2);color:var(--uos-ink)}
.sbx-pill-beginner{background:rgba(var(--uos-accent-rgb),.16)}
.sbx-pill-intermediate{background:rgba(245,158,11,.16)}
.sbx-pill-advanced{background:rgba(239,68,68,.14)}
.sbx-task-foot{margin-top:auto;padding-top:6px}
.sbx-status{display:inline-flex;align-items:center;gap:6px;font-size:.88rem;font-weight:600;color:var(--uos-accent-text)}
.sbx-status.is-passed{color:var(--uos-success)}
.sbx-status.is-progress{color:var(--uos-text)}
@media (max-width:767px){.sbx-hero{grid-template-columns:1fr}.sbx-topic-art{flex-basis:96px}}

/* ---------- workspace ---------- */
.sbw .sbw-wrap{max-width:1500px;margin:0 auto;padding:0 20px}
.sbw-top{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;padding:6px 0 14px}
.sbw-back{display:inline-flex;align-items:center;gap:6px;color:var(--uos-muted);font-size:.9rem;text-decoration:none;min-height:32px}
.sbw-back:hover{color:var(--uos-ink)}
.sbw-title h1{font-size:var(--uos-fs-h2);margin:2px 0 6px;color:var(--uos-ink);letter-spacing:-.02em}
.sbw-meta{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:0;color:var(--uos-muted);font-size:.9rem}
.sbw-meta strong{color:var(--uos-ink)}
.sbw-actions{display:flex;gap:8px;flex-wrap:wrap}
.sbw-note{margin-bottom:12px}
.sbw-pass{display:none;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:var(--uos-radius);border:1px solid rgba(var(--uos-accent-rgb),.6);background:rgba(var(--uos-accent-rgb),.12);margin-bottom:14px;color:var(--uos-text)}
.sbw-pass.is-on{display:flex}
.sbw-pass i{font-size:22px;color:var(--uos-accent-text);margin-top:2px}
.sbw-pass a{color:var(--uos-accent-text);font-weight:600}
.sbw-grid{display:grid;grid-template-columns:minmax(300px,380px) minmax(0,1fr);gap:18px;align-items:start}
.sbw-side{display:flex;flex-direction:column;gap:14px;position:static;padding-right:2px}
@media (min-height:1400px){.sbw-side{position:sticky;top:calc(var(--uos-header-h,72px) + 12px)}}
.sbw-card{border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-surface-solid);padding:16px}
.sbw-card h2{font-size:1rem;margin:0 0 8px;color:var(--uos-ink)}
.sbw-card h3{font-size:.95rem;margin:10px 0 6px;color:var(--uos-ink)}
.sbw-brief{color:var(--uos-text);line-height:1.6;font-size:.95rem}
.sbw-muted{color:var(--uos-muted);font-size:.88rem;margin:0 0 8px}
.sbw-goals{margin:0;padding-left:18px;list-style:disc;color:var(--uos-text);font-size:.93rem;line-height:1.55}
.sbw-goals li{margin-bottom:4px}
.sbw-checks{list-style:none;margin:0;padding:0}
.sbw-checks li{display:flex;gap:10px;padding:8px 0;border-top:1px solid var(--uos-line);font-size:.92rem;color:var(--uos-text)}
.sbw-checks li small{display:block;color:var(--uos-muted);margin-top:2px}
.sbw-mark{flex:0 0 22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700}
.sbw-checks .is-pass .sbw-mark{background:var(--uos-accent);color:var(--uos-on-accent)}
.sbw-checks .is-fail .sbw-mark{background:var(--uos-danger-soft);color:var(--uos-danger)}
.sbw-hints{margin:0;padding-left:20px}
.sbw-hints li{margin-bottom:8px;color:var(--uos-text);font-size:.93rem}
.sbw-hints li.is-open p{margin:0;padding:8px 10px;border-radius:10px;background:var(--uos-canvas-2);line-height:1.55}
.sbw-solution{margin-top:10px;padding-top:10px;border-top:1px dashed var(--uos-line-2)}
.sbw-side .uos-btn{white-space:normal;max-width:100%;min-width:0;text-align:center}
.sbw-sources{margin:0;padding-left:18px;list-style:disc;font-size:.9rem}
.sbw-sources a{color:var(--uos-accent-text);display:inline}
.sbw-sources li{line-height:1.5;margin-bottom:4px}
.sbw-sim-gap{margin:0 0 10px;font-size:.9rem;color:var(--uos-text)}
.sbw-sim-gap strong{font-variant-numeric:tabular-nums}
.uos-btn.is-armed{border-color:var(--uos-warning);color:var(--uos-ink)}
.uos-btn-primary.is-armed{color:var(--uos-on-accent)}
.sbw-main{min-width:0;border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-surface-solid);overflow:clip}
.sbw-tabs{display:flex;gap:2px;padding:6px;border-bottom:1px solid var(--uos-line);background:var(--uos-canvas-2)}
.sbw-tabs button,.sbw-subtabs button{border:0;background:transparent;color:var(--uos-muted);font-weight:600;font-size:.92rem;padding:8px 14px;border-radius:10px;cursor:pointer}
.sbw-tabs button[aria-selected=true]{background:var(--uos-surface-solid);color:var(--uos-ink);box-shadow:0 1px 0 var(--uos-line-2)}
.sbw-tabs button:hover,.sbw-subtabs button:hover{color:var(--uos-ink)}
.sbw-panel{padding:16px}
.sbw-subtabs{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:12px}
.sbw-subtabs button{border:1px solid var(--uos-line);padding:6px 12px;font-size:.88rem}
.sbw-subtabs button.is-on{background:var(--uos-accent);border-color:var(--uos-accent);color:var(--uos-on-accent)}
.sbw-pagebar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.sbw-pagebar select{min-width:220px;max-width:100%}
.sbw-editor select,.sbw-editor input[type=text],.sbw-editor textarea,.sbw-addr input,.sbw-q input{width:100%;min-height:38px;padding:8px 10px;border-radius:10px;border:1px solid var(--uos-line-2);background:var(--uos-input);color:var(--uos-ink);font-size:.93rem}
.sbw-pagebar select{width:auto}
.sbw-pagebar .sbw-muted{margin:0}
.sbw-pagebar .uss-trigger{flex:0 1 320px;width:auto;display:inline-flex}
.sbw-unsaved{display:flex;align-items:center;justify-content:space-between;gap:10px 16px;flex-wrap:wrap;padding:10px 12px;margin:0 0 12px;border:1px solid var(--uos-warning);border-radius:12px;background:var(--uos-surface-solid)}
.sbw-unsaved p{margin:0;font-size:.9rem;color:var(--uos-ink);font-weight:600}
.sbw-unsaved-actions{display:flex;gap:8px;flex-wrap:wrap}
.sbw-addpage{border:1px solid var(--uos-line);border-radius:12px;padding:12px 14px;margin:0 0 12px}
.sbw-addpage label{display:block;font-size:.86rem;font-weight:600;color:var(--uos-ink);margin-bottom:4px}
.sbw-addpage-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.sbw-editor .sbw-addpage-row input[type=text]{flex:1 1 220px;width:auto}
.sbw-error{display:block;color:var(--uos-danger);font-size:.82rem;font-weight:600;margin-top:4px}
.sbw-editor textarea.is-mono,.sbw-source{font-family:var(--uos-font-mono);font-size:.84rem;line-height:1.55}
.sbw-editor textarea{resize:vertical}
.sbw-set{border:1px solid var(--uos-line);border-radius:12px;padding:12px 14px 4px;margin:0 0 12px}
.sbw-set legend{float:none;width:auto;font-size:.9rem;font-weight:600;color:var(--uos-ink);padding:0 6px;margin:0}
.sbw-field{margin-bottom:12px}
.sbw-field label,.sbw-label{display:block;font-size:.86rem;font-weight:600;color:var(--uos-ink);margin-bottom:4px}
.sbw-help{display:block;color:var(--uos-muted);font-size:.8rem;margin-top:3px}
.sbw-count{display:block;text-align:right;font-size:.78rem;color:var(--uos-muted);margin-top:2px;font-variant-numeric:tabular-nums}
.sbw-count.is-off{color:var(--uos-danger)}
.sbw-json{font-size:.78rem;color:var(--uos-success)}
.sbw-json.is-off{color:var(--uos-danger)}
.sbw-list{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}
.sbw-pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr) auto;gap:8px;align-items:center}
.sbw-triple{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) 140px auto;gap:8px;align-items:center}
.sbw-arrow{color:var(--uos-muted);font-size:.85rem}
.sbw-row-foot{display:flex;justify-content:space-between;gap:8px;margin-top:4px}
.sbw-link{border:0;background:none;color:var(--uos-accent-text);font-size:.85rem;font-weight:600;padding:4px;cursor:pointer;text-decoration:underline;text-underline-offset:.2em}
.sbw-adv{border:1px solid var(--uos-line);border-radius:12px;padding:10px 14px;margin-bottom:12px}
.sbw-adv summary{cursor:pointer;font-weight:600;font-size:.9rem;color:var(--uos-ink);margin-bottom:6px}
.sbw-check{display:flex;gap:8px;align-items:center;font-size:.9rem;color:var(--uos-text);margin-bottom:10px}
.sbw-savebar{position:sticky;bottom:0;display:flex;justify-content:flex-end;align-items:center;gap:12px;padding:10px 0 2px;background:var(--uos-surface-solid);border-top:1px solid var(--uos-line)}
.sbw-dirty{font-size:.85rem;color:var(--uos-muted)}
.sbw-dirty.is-dirty{color:var(--uos-warning);font-weight:600}
.sbw-addr,.sbw-q{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.sbw-host{color:var(--uos-muted);font-size:.88rem;white-space:nowrap}
.sbw-status{min-height:20px}
.sbw-addr .uos-btn[aria-pressed="true"]{background:rgba(var(--uos-accent-rgb),.12);border-color:var(--uos-accent);color:var(--uos-accent-strong)}
.sbw-serp .sbw-err{color:var(--uos-danger);font-weight:600}
.sbw-skip{display:none}
.sbw-frame{width:100%;height:70vh;min-height:420px;border:1px solid var(--uos-line);border-radius:12px;background:#fff}
.sbw-source{max-height:70vh;overflow:auto;padding:12px;border-radius:12px;background:var(--uos-canvas-2);border:1px solid var(--uos-line);color:var(--uos-text);white-space:pre-wrap;word-break:break-word}
.sbw-serp{list-style:none;margin:10px 0 0;padding:0;max-width:760px}
.sbw-res{display:flex;gap:12px;padding:12px;border-radius:12px;margin-bottom:6px}
.sbw-res.is-own{background:rgba(var(--uos-accent-rgb),.08);border:1px solid rgba(var(--uos-accent-rgb),.35)}
.sbw-pos{flex:0 0 28px;font-size:.82rem;color:var(--uos-muted);font-variant-numeric:tabular-nums;padding-top:2px}
.sbw-crumb{font-size:.82rem;color:var(--uos-muted)}
.sbw-rtitle{font-size:1.12rem;color:var(--uos-info);line-height:1.35;margin:2px 0}
.sbw-rich{font-size:.84rem;color:var(--uos-text);margin:2px 0}
.sbw-rdesc{font-size:.9rem;color:var(--uos-text);line-height:1.5}
.sbw-notes{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.sbw-tag{font-size:.75rem;font-weight:600;padding:2px 8px;border-radius:999px;background:var(--uos-canvas-2);border:1px solid var(--uos-line-2);color:var(--uos-ink)}
.sbw-tag.is-warn{border-color:var(--uos-warning)}
.sbw-ai{max-width:760px;padding:12px 14px;border:1px solid var(--uos-line-2);border-radius:12px;margin:8px 0;background:var(--uos-canvas-2)}
.sbw-ai blockquote{margin:8px 0 0;padding:8px 12px;border-left:3px solid var(--uos-accent);background:var(--uos-surface-solid);border-radius:0 10px 10px 0}
.sbw-ai blockquote p{margin:0 0 4px;color:var(--uos-text);font-size:.92rem}
.sbw-ai cite{font-size:.8rem;color:var(--uos-muted);font-style:normal}
.sbw-toast{position:fixed;right:16px;bottom:16px;z-index:9999;padding:10px 14px;border-radius:10px;background:var(--uos-ink);color:var(--uos-canvas);font-size:.9rem}
.sbw-toast.is-bad{background:var(--uos-danger);color:#fff}
@media (max-width:1100px){.sbw-grid{grid-template-columns:1fr}.sbw-side{position:static;max-height:none;overflow:visible}.sbw-skip{display:inline-block;margin-top:10px;font-weight:600;color:var(--uos-accent-strong)}#sbwWork{scroll-margin-top:80px}}
@media (max-width:575px){.sbw .sbw-wrap{padding:0 12px}.sbw-panel{padding:12px}.sbw-pair{grid-template-columns:1fr 1fr}.sbw-pair .sbw-link{grid-column:1/-1;justify-self:start}.sbw-triple{grid-template-columns:1fr 1fr}.sbw-triple .sbw-arrow{display:none}.sbw-frame{height:60vh}.sbw-addr{flex-wrap:wrap}}

/* ---------- workspace: search results preview (simulated ranking) ---------- */
.sbw-tabs{flex-wrap:wrap}
.sbw-sim-label{display:flex;gap:10px;align-items:flex-start;margin:0 0 14px;padding:10px 12px;border:1px dashed var(--uos-line-2);border-radius:12px;background:var(--uos-canvas-2);color:var(--uos-text);font-size:.9rem;line-height:1.5}
.sbw-sim-label i{margin-top:3px;color:var(--uos-accent-text)}
.sbw-sim-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:0 0 8px}
.sbw-sim-stats div{border:1px solid var(--uos-line);border-radius:12px;padding:10px 12px;min-width:0}
.sbw-sim-stats dt{font-size:.78rem;color:var(--uos-muted);font-weight:500}
.sbw-sim-stats dd{margin:2px 0 0;color:var(--uos-ink);display:flex;flex-wrap:wrap;align-items:center;gap:4px 8px;font-variant-numeric:tabular-nums}
.sbw-sim-stats dd strong{font-size:1.35rem;font-weight:600}
.sbw-sim-stats dd small{color:var(--uos-muted);font-size:.8rem}
.sbw-sim-kw{font-weight:600;font-size:.98rem;overflow-wrap:anywhere}
.sbw-sim-since{margin-bottom:12px}
.sbw-mv{display:inline-flex;align-items:center;height:22px;padding:0 8px;border-radius:999px;font-size:.75rem;font-weight:600;border:1px solid var(--uos-line-2);color:var(--uos-muted);white-space:nowrap}
.sbw-mv.is-up{border-color:var(--uos-success);color:var(--uos-success)}
.sbw-mv.is-down{border-color:var(--uos-danger);color:var(--uos-danger)}
.sbw-sim-alert{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;margin:0 0 12px;border:1px solid var(--uos-warning);border-radius:12px;color:var(--uos-text)}
.sbw-sim-alert i{margin-top:3px;color:var(--uos-warning)}
.sbw-sim-alert p{margin:0;font-size:.92rem;line-height:1.5}
.sbw-sim h3{font-size:.95rem;margin:0 0 8px;color:var(--uos-ink)}
.sbw-sim-moves,.sbw-sim-factors{border:1px solid var(--uos-line);border-radius:12px;padding:12px 14px;margin-bottom:12px}
.sbw-sim-moves ul{list-style:none;margin:0;padding:0}
.sbw-sim-moves li{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:7px 0;border-top:1px solid var(--uos-line);font-size:.92rem;color:var(--uos-text)}
.sbw-sim-moves li:first-child{border-top:0}
.sbw-sim-moves li i{width:16px;text-align:center}
.sbw-sim-moves li.is-good i{color:var(--uos-success)}
.sbw-sim-moves li.is-bad i{color:var(--uos-danger)}
.sbw-sim-moves li span:not(.sbw-mv){flex:1 1 220px}
.sbw-meters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:10px}
.sbw-meter-top{display:flex;justify-content:space-between;gap:8px;font-size:.85rem;color:var(--uos-text)}
.sbw-meter-top strong{color:var(--uos-ink);font-variant-numeric:tabular-nums}
.sbw-meter-bar{height:6px;border-radius:6px;background:var(--uos-line);overflow:hidden;margin:6px 0 4px}
.sbw-meter-bar span{display:block;height:100%;background:var(--uos-accent);border-radius:6px}
.sbw-meter small{display:block;color:var(--uos-muted);font-size:.8rem;line-height:1.4}
.sbw-sim-slots{list-style:none;margin:0;padding:0;font-size:.88rem;color:var(--uos-text)}
.sbw-sim-slots li{padding:4px 0 4px 14px;position:relative;line-height:1.45}
.sbw-sim-slots li::before{content:"";position:absolute;left:0;top:.75em;width:6px;height:6px;border-radius:50%;background:var(--uos-success)}
.sbw-sim-slots li.is-gap::before{background:var(--uos-warning)}
.sbw-sim-serp{list-style:none;margin:6px 0 12px;padding:0;max-width:820px}
.sbw-sim-res{display:flex;gap:12px;padding:12px;border-radius:12px;border:1px solid transparent}
.sbw-sim-res + .sbw-sim-res{margin-top:4px}
.sbw-sim-res.is-own{background:rgba(var(--uos-accent-rgb),.08);border-color:rgba(var(--uos-accent-rgb),.4)}
.sbw-sim-res.is-missing{border-style:dashed}
.sbw-sim-body{min-width:0;flex:1}
.sbw-sim-body .sbw-crumb,.sbw-sim-body .sbw-rtitle{overflow-wrap:anywhere}
.sbw-sim-metrics{display:flex;flex-wrap:wrap;gap:4px 12px;margin-top:6px;font-size:.78rem;color:var(--uos-muted);font-variant-numeric:tabular-nums}
.sbw-sim-how{border:1px solid var(--uos-line);border-radius:12px;padding:10px 14px}
.sbw-sim-how summary{cursor:pointer;font-weight:600;font-size:.9rem;color:var(--uos-ink)}
.sbw-sim-how ul{margin:8px 0 0;padding-left:18px;list-style:disc;font-size:.88rem;line-height:1.55;color:var(--uos-text)}
.sbw-rankline{display:flex;flex-wrap:wrap;align-items:center;gap:4px 6px;margin:10px 0 0;padding-top:10px;border-top:1px solid var(--uos-line);font-size:.9rem;color:var(--uos-text)}
.sbw-rankline i{color:var(--uos-accent-text)}
@media (max-width:900px){.sbw-sim-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.sbw-meters{grid-template-columns:1fr}}
@media (max-width:575px){.sbw-tabs button{padding:8px 10px;font-size:.86rem}.sbw-sim-res{padding:10px 8px;gap:8px}}

/* ---------- Virtual Lab hub (lab.php): tabs and the scenario lab catalogue ---------- */
.lh-tabs{display:flex;flex-wrap:wrap;gap:4px;padding:5px;margin:4px 0 18px;border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-canvas-2)}
.lh-tabs[hidden]{display:none}
.lh-tabs button{display:inline-flex;align-items:center;gap:8px;min-height:40px;border:0;background:transparent;color:var(--uos-muted);font-weight:600;font-size:.93rem;padding:0 14px;border-radius:8px;cursor:pointer}
.lh-tabs button:hover{color:var(--uos-ink)}
.lh-tabs button[aria-selected=true]{background:var(--uos-surface-solid);color:var(--uos-ink);box-shadow:0 1px 0 var(--uos-line-2)}
.lh-tabs .lh-count{font-size:.78rem;font-weight:600;color:var(--uos-muted);font-variant-numeric:tabular-nums}
.lh-panel{scroll-margin-top:calc(var(--uos-header-h,72px) + 16px)}
.lh-panel + .lh-panel{margin-top:28px}
.lh-tabs:not([hidden]) ~ .lh-panel + .lh-panel{margin-top:0}
.lh-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:12px 24px;margin-bottom:14px}
.lh-head h2{font-size:1.4rem;margin:0 0 4px;color:var(--uos-ink)}
.lh-head p{margin:0;color:var(--uos-muted);max-width:68ch;line-height:1.55}
.lh-stats{display:flex;gap:10px;margin:0}
.lh-stats div{border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-surface-solid);padding:8px 12px;min-width:92px}
.lh-stats dt{font-size:.76rem;color:var(--uos-muted);font-weight:500}
.lh-stats dd{margin:0;font-size:1.25rem;font-weight:600;color:var(--uos-ink);font-variant-numeric:tabular-nums}
.lh-stats dd small{font-size:.8rem;color:var(--uos-muted);font-weight:500}
.lh-tools{display:flex;flex-direction:column;gap:10px;margin-bottom:6px}
.lh-search{position:relative;max-width:420px}
.lh-search i{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--uos-muted);pointer-events:none}
.lh-search input{width:100%;min-height:42px;padding:8px 12px 8px 36px;border-radius:999px;border:1px solid var(--uos-line-2);background:var(--uos-input);color:var(--uos-ink);font-size:.95rem}
.lh-chips{display:flex;flex-wrap:wrap;gap:8px}
.lh-chips button{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:0 13px;border-radius:999px;border:1px solid var(--uos-line-2);background:var(--uos-surface-solid);color:var(--uos-ink);font-size:.88rem;cursor:pointer}
.lh-chips button:hover{border-color:var(--uos-ink)}
.lh-chips button[aria-pressed=true]{background:var(--uos-accent);border-color:var(--uos-accent);color:var(--uos-on-accent);font-weight:600}
.lh-chips button small{font-size:.75rem;opacity:.8;font-variant-numeric:tabular-nums}
.lh-cat{margin-top:26px}
.lh-cat[hidden]{display:none}
.lh-cat-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:4px 16px;margin-bottom:12px}
.lh-cat-head h3{font-size:1.15rem;margin:0;color:var(--uos-ink)}
.lh-cat-head p{margin:2px 0 0;color:var(--uos-muted);font-size:.9rem;flex-basis:100%}
.lh-cat-head small{color:var(--uos-muted);font-size:.82rem;font-variant-numeric:tabular-nums}
.lh-cards li[hidden]{display:none}
.lh-card-brief{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.lh-card-meta{display:flex;flex-wrap:wrap;gap:4px 12px;font-size:.8rem;color:var(--uos-muted);font-variant-numeric:tabular-nums}
.lh-card-meta i{margin-right:4px}
.lh-noresults{color:var(--uos-muted);padding:18px 0}
@media (max-width:575px){.lh-tabs button{flex:1 1 auto;justify-content:center;padding:0 10px}.lh-stats{width:100%}.lh-stats div{flex:1;min-width:0}.lh-search{max-width:none}}

/* ---------- topic pages and free resources ---------- */
.tp-hero{display:flex;gap:22px;align-items:center;padding:10px 0 8px}
.tp-art{flex:0 0 220px;aspect-ratio:240/140;border-radius:16px;background:var(--uos-canvas-2);border:1px solid var(--uos-line);padding:8px 10px 0}
.tp-hero h1{font-size:var(--uos-fs-h1);line-height:var(--uos-lh-heading);font-weight:600;letter-spacing:var(--uos-ls-heading);margin:0 0 8px;color:var(--uos-ink)}
.tp-hero p{margin:0 0 8px;color:var(--uos-muted);max-width:62ch;line-height:1.6}
.tp-links{display:flex;gap:16px;flex-wrap:wrap}
.tp-links a{color:var(--uos-accent-text);font-weight:600;text-decoration:underline;text-underline-offset:.2em}
.rs-list{list-style:none;margin:10px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.rs-list li{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border:1px solid var(--uos-line);border-radius:var(--uos-radius);background:var(--uos-surface-solid)}
.rs-list a{color:var(--uos-ink);font-weight:600;text-decoration:none}
.rs-list a:hover{text-decoration:underline;text-underline-offset:.2em}
.rs-list a i{font-size:.75em;color:var(--uos-muted)}
.rs-list span{color:var(--uos-muted);font-size:.92rem;line-height:1.5}
.rs-list small{margin-top:auto;padding-top:4px;font-size:.78rem;font-weight:600;color:var(--uos-accent-text)}
.rs-toc{margin:6px 0 4px}
.rs-group{scroll-margin-top:calc(var(--uos-header-h,72px) + 20px)}
@media (max-width:767px){.tp-hero{flex-direction:column;align-items:flex-start}.tp-art{flex-basis:auto;width:200px}}
/* Topic page: "SEO CTF challenges" heading with its "See all in SEO CTF" link; category label on lab cards in the SEO CTF hub */
.tp-labs-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:4px 16px}
.tp-labs-head .uhub-h2{margin-bottom:6px}
.tp-ctf-link{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--uos-accent-text);text-decoration:none}
.tp-ctf-link:hover{text-decoration:underline;text-underline-offset:.2em}
.sbx-cat{font-size:.78rem;font-weight:600;color:var(--uos-muted);letter-spacing:.01em}