:root{--ink:#12263A;--muted:#56677A;--bg:#F2F5F8;--card:#fff;--line:#D5DDE5;--acc:#0F6E7A;--acc2:#0A4F58;--warn:#A8570A;--bad:#B3261E;--ok:#1B7F3B}
*{box-sizing:border-box}html,body{margin:0}body{font:17px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);-webkit-text-size-adjust:100%}
.wrap{max-width:760px;margin:0 auto;padding:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;margin:12px 0}
h1{font-size:1.35rem;margin:.2rem 0 .6rem}h2{font-size:1.1rem;margin:.2rem 0}
label.f{display:block;font-weight:600;margin:12px 0 4px}
input[type=text],input[type=password],input[type=number],textarea{width:100%;font:inherit;padding:12px;border:1.5px solid #9FB0C0;border-radius:10px;background:#fff;color:var(--ink)}
input.num{display:inline-block;width:9.5ch;text-align:right;font-variant-numeric:tabular-nums;padding:8px 10px;margin:0 2px}
input:focus,textarea:focus{outline:3px solid #9BD3DA;border-color:var(--acc)}
button.btn{font:inherit;font-weight:700;background:var(--acc);color:#fff;border:0;border-radius:12px;padding:14px 22px;min-height:48px;cursor:pointer;width:100%;margin-top:14px}
button.btn:hover{background:var(--acc2)}button.btn:disabled{opacity:.55;cursor:default}
button.alt{background:#fff;color:var(--acc);border:1.5px solid var(--acc);width:auto;padding:8px 14px;min-height:40px;margin:2px}
.note{font-size:.88rem;color:var(--muted);background:#EAF4F6;border-left:4px solid var(--acc);padding:10px 12px;border-radius:6px;margin:12px 0}
.err{color:var(--bad);font-weight:600;margin-top:10px;min-height:1.4em}
.top{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:.92rem;color:var(--muted)}
.timer{font-variant-numeric:tabular-nums;font-weight:700;background:#fff;border:1.5px solid var(--line);border-radius:99px;padding:4px 12px;color:var(--ink)}
.timer.warn{color:var(--warn);border-color:var(--warn)}.timer.crit{color:#fff;background:var(--bad);border-color:var(--bad)}
.bar{height:6px;background:#DCE5EC;border-radius:99px;overflow:hidden;margin:8px 0 4px}.bar i{display:block;height:100%;background:var(--acc)}
.q{font-size:1.02rem}.q img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:8px}
.q p{margin:.6em 0}
.mcg{display:block;margin:6px 0 12px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;margin:6px 0;background:#fff;cursor:pointer}
.opt input{margin-top:.3em;width:20px;height:20px;flex:none;accent-color:var(--acc)}
.opt:has(input:checked){border-color:var(--acc);background:#E6F3F5}
.banner{background:#FFF3E0;color:#7A3E00;border:1px solid #F0B76A;border-radius:8px;padding:8px 12px;margin:8px 0;font-size:.9rem}
table{border-collapse:collapse;width:100%;background:#fff;font-size:.92rem}th,td{padding:7px 9px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{color:var(--muted);font-size:.8rem}
.n{text-align:right;font-variant-numeric:tabular-nums}
.f1{display:inline-block;font-size:.76rem;border:1px solid var(--warn);color:var(--warn);border-radius:99px;padding:1px 8px;margin:1px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0}.tabs button.on{background:var(--acc);color:#fff}
.scroll{overflow-x:auto}
code.k{font:700 1rem ui-monospace,Consolas,monospace;letter-spacing:.08em}
@media (max-width:480px){body{font-size:16px}.wrap{padding:10px}.card{padding:14px}}

/* navegación entre preguntas */
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.chip{min-width:44px;min-height:44px;border-radius:10px;border:2px solid #8aa0ac;background:#fff;color:#12303b;font:inherit;font-weight:700;cursor:pointer}
.chip.done{background:#e3f1ee;border-color:#0f6b73}
.chip.cur{background:#0f6b73;border-color:#0f6b73;color:#fff}
.navrow{display:flex;gap:10px;margin:10px 0}
.navrow .btn{flex:1}
#fin{margin-top:6px}
.ov{text-decoration:overline}

input.num.set{width:min(100%,26ch);text-align:left}
select.menu{max-width:100%;padding:7px 8px;margin:2px 2px;font:inherit;border:1px solid #888;border-radius:6px;background:#fff;color:#000}
table.pf{border-collapse:collapse;margin:8px 0}table.pf td{border:1px solid #bbb;padding:4px 8px;vertical-align:middle}
.card.q{overflow-x:auto}
table.pf{width:100%;font-size:.95em}
table.pf td{padding:4px 5px}
table.pf select.menu{width:100%;min-width:0;font-size:.92em}
@media (max-width:600px){table.pf td:first-child{width:1%;white-space:nowrap}}

.setbox{display:inline-flex;align-items:center;gap:4px;max-width:100%;flex-wrap:nowrap}
.setbox .brace{font-size:1.6em;line-height:1}
.setbox input.num.set{flex:1 1 12ch;min-width:8ch;width:auto;max-width:26ch}
.setbox button.empty{padding:6px 12px;font-size:1.1em;border:1px solid #888;border-radius:6px;background:#fff;color:#000;cursor:pointer;margin-left:4px}

.subj{margin:-6px 0 12px;color:var(--muted);font-size:1.02rem;font-weight:600}
.intro{font-size:.93rem;line-height:1.45;margin:12px 0;max-height:none}
.intro h2{font-size:1rem;margin:14px 0 6px}
.intro ul{padding-left:1.2em;margin:6px 0}
.intro .warn{background:#FFF4E5;border-left:4px solid #E08A00;padding:8px 10px;border-radius:6px;margin:10px 0}
.hint{font-size:.9rem;background:#EAF4F6;border-left:4px solid var(--acc);padding:7px 10px;border-radius:6px;margin:0 0 12px}