:root{--paper:#eef1f4;--panel:#fff;--ink:#233044;--muted:#667386;--line:#d7dde5;--accent:#a80036;--accent-soft:#fbe9ef;--ok:#238455;
  --specific:#d9ebff;--selective:#fff0b5;--timely:#f9dcec;--context:#d6f0de;
  font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink)}
*{box-sizing:border-box}
body{margin:0;background:var(--paper)}
.top{position:sticky;top:0;z-index:30;background:var(--panel);border-bottom:2px solid var(--accent);padding:10px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;gap:12px;align-items:center}
.brand strong{font-size:19px;letter-spacing:-.4px}.brand small{display:block;color:var(--muted);font-size:12px;line-height:1.2}
.logo{background:#fefecf;border:1.5px solid var(--accent);color:var(--accent);font-weight:700;font-size:20px;padding:2px 9px}
.prog{min-width:170px;text-align:right;font-size:12px;color:var(--muted)}
.bar{height:6px;background:var(--line);border-radius:3px;margin-top:4px;overflow:hidden}.bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .3s}
main{max-width:920px;margin:0 auto;padding:26px 18px 90px;outline:none}
h1{font-size:28px;line-height:1.2;margin:0 0 6px;letter-spacing:-.5px}
h2{font-size:21px;margin:0 0 4px}
h3{font-size:17px;margin:0}
.lead{color:var(--muted);margin:0 0 20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:20px 22px;margin:0 0 18px}
.notice{border-left:4px solid #7aa7cc;background:#edf5fc;padding:14px 18px;border-radius:6px;margin:0 0 18px}
.notice p{margin:0 0 8px}.notice p:last-child{margin:0}
button,.btn{font:inherit;border:1px solid var(--line);background:#fff;color:var(--ink);padding:9px 16px;border-radius:6px;cursor:pointer}
button:hover{border-color:var(--accent);color:var(--accent)}
button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button.primary:hover{background:#8d002e;color:#fff}
button:focus-visible,input:focus-visible,textarea:focus-visible,video:focus-visible{outline:3px solid #2f6fb3;outline-offset:2px}
.nav{display:flex;justify-content:space-between;gap:12px;margin-top:26px}
.video-wrap video{width:100%;border-radius:8px;background:#101828;display:block}
.chapters{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.chapters button{font-size:13px;padding:5px 11px;border-radius:14px}
.vlang{font-size:13px;color:var(--muted);margin-top:8px}.vlang button{font-size:13px;padding:2px 9px;border-radius:12px;margin-left:6px}.vlang button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:#fff}
.q{margin:0 0 20px}.q:last-child{margin-bottom:0}
.q>label,.q>legend,.qtext{display:block;font-weight:600;margin:0 0 8px;padding:0}
fieldset{border:0;margin:0;padding:0;min-width:0}
.choices{display:grid;gap:8px}
.choice{display:flex;gap:10px;align-items:flex-start;padding:9px 12px;border:1px solid var(--line);border-radius:8px;cursor:pointer;background:#fff}
.choice:hover{border-color:var(--accent)}
.choice input{margin-top:5px;accent-color:var(--accent)}
.choice:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}
textarea,input[type=text]{width:100%;font:inherit;border:1px solid var(--line);border-radius:8px;padding:10px 12px;background:#fff;color:inherit}
textarea{min-height:90px;resize:vertical}
.hint{color:var(--muted);font-size:14px}
/* 1-5 scale */
.scale{display:flex;align-items:stretch;gap:6px;flex-wrap:wrap}
.scale label{position:relative;cursor:pointer}
.scale input{position:absolute;opacity:0;inset:0;cursor:pointer}
.scale span{display:flex;align-items:center;justify-content:center;min-width:44px;height:44px;border:1px solid var(--line);border-radius:8px;background:#fff;font-weight:700}
.scale label:hover span{border-color:var(--accent)}
.scale input:checked+span{background:var(--accent);border-color:var(--accent);color:#fff}
.scale input:focus-visible+span{outline:3px solid #2f6fb3;outline-offset:2px}
.scale .na span{min-width:0;padding:0 12px;font-weight:500;font-size:13px;color:var(--muted)}
.scale .na input:checked+span{background:#475467;border-color:#475467;color:#fff}
.ends{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin:3px 0 0;max-width:290px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.row2 .who{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin:0 0 6px}
.who.mu{color:var(--accent)}.who.chat{color:#475467}
/* mechanism card */
.mech{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:20px;padding:0;overflow:hidden}
.mech .vis{background:#f7f8fa;border-right:1px solid var(--line);padding:16px;display:flex;flex-direction:column;gap:10px}
.mech .vis img{width:100%;height:auto;border:1px solid var(--line);border-radius:6px;background:#fff;display:block}
.mech .vis .see{font-size:14px;margin:0}
.mech .body{padding:18px 20px 18px 0}
.chip{display:inline-block;font-size:12px;font-weight:700;padding:2px 10px;border-radius:12px;color:var(--ink)}
.chip.Específica{background:var(--specific)}.chip.Selectiva{background:var(--selective)}.chip.A-tiempo{background:var(--timely)}.chip.Contextualizada{background:var(--context)}
.nolive{display:inline-block;font-size:12px;font-weight:700;color:#7a4b00;background:#fff0c9;border-radius:12px;padding:2px 10px}
.mech .what{margin:8px 0 14px}
.watch{align-self:flex-start;font-size:13px;padding:6px 12px}
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cmp figure{margin:0;background:#f7f8fa;border:1px solid var(--line);border-radius:8px;padding:12px}
.cmp img{width:100%;height:auto;border:1px solid var(--line);border-radius:6px;background:#fff;display:block}
.cmp figcaption{font-weight:700;margin:8px 0}
.float{position:fixed;right:18px;bottom:18px;z-index:40;background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 4px 14px #0003}
.float:hover{background:#8d002e;color:#fff}
dialog{width:min(860px,95vw);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:10px;padding:0}
dialog::backdrop{background:#17223788}
.dlg-head{display:flex;justify-content:space-between;align-items:center;padding:12px 18px}
.dlg-head h2{font-size:18px;margin:0}.dlg-head button{border:0;font-size:24px;padding:0 8px;line-height:1}
dialog video{width:100%;display:block;background:#101828}
.dlg-note{margin:10px 18px 0;color:var(--muted);font-size:14px}
dialog .chapters{padding:8px 18px 16px}
.err{color:#a80036;font-weight:600}
.thanks{text-align:center;padding:40px 22px}
.thanks .tick{font-size:46px;color:var(--ok)}
@media(max-width:760px){.mech{grid-template-columns:1fr}.mech .vis{border-right:0;border-bottom:1px solid var(--line)}.mech .body{padding:0 18px 18px}.row2,.cmp{grid-template-columns:1fr}.prog{display:none}}
fieldset.card>legend{float:left;width:100%;padding:0;margin:0 0 8px}
fieldset.card>legend+*{clear:both}

/* part A: sticky comparison + compact rows */
.alayout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:22px;align-items:start}
.compare{position:sticky;top:76px;display:grid;gap:12px}
.compare figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px}
.compare figcaption{font-weight:700;margin:0 0 6px}.compare figcaption small{font-weight:400;color:var(--muted)}
.compare img{width:100%;height:auto;max-height:180px;object-fit:cover;object-position:top;border:1px solid var(--line);border-radius:6px;display:block;background:#fff}
.compare .watch{margin-top:8px;width:100%}
.arows h2{margin-bottom:2px}
.arow{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:10px 0 0}
.arow>legend{float:left;width:100%;padding:0;margin:0 0 10px;font-weight:600}.arow>legend+*{clear:both}
.arow .row2{gap:14px}
.arow .scale span{min-width:38px;height:38px}
.arow .ends{display:none}
.chip.dim-Específica,.def.dim-Específica{background:var(--specific)}
.chip.dim-Selectiva,.def.dim-Selectiva{background:var(--selective)}
.chip.dim-A-tiempo,.def.dim-A-tiempo{background:var(--timely)}
.chip.dim-Contextualizada,.def.dim-Contextualizada{background:var(--context)}
.chip.dim-extra{background:#e4e7ec}
.deflist{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
.def{border-radius:8px;padding:10px 12px;font-size:14px;line-height:1.45;color:var(--ink)}
p.def{margin:6px 0 10px}p.def span{color:var(--muted)}
@media(max-width:900px){.alayout{grid-template-columns:1fr}.compare{position:static;grid-template-columns:1fr 1fr}.deflist{grid-template-columns:1fr}}

fieldset[aria-invalid="true"]{outline:2px solid #a80036;outline-offset:4px}