:root{--blue:#0b6bcb;--blue2:#eaf4ff;--ink:#172033;--muted:#64748b;--line:#dbe3ee;--bg:#f5f7fb;--card:#fff;--green:#16803a;--greenbg:#eaf7ef;--yellow:#a16207;--yellowbg:#fff8df;--red:#c72d2d;--redbg:#fff0f0;--shadow:0 8px 26px rgba(19,39,70,.08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink)}
*{box-sizing:border-box}body{margin:0;background:var(--bg);font-size:16px}.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20;padding:0 max(18px,env(safe-area-inset-left));background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;gap:10px;align-items:center;border:0;background:none;font-weight:800;font-size:16px;color:var(--ink);cursor:pointer}.logo{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--blue);color:white;font-weight:900}.ghost,.primary,.danger,.secondary,.chip{border:0;border-radius:12px;padding:11px 15px;font-weight:750;cursor:pointer;font-size:14px}.ghost,.secondary{background:#edf2f7;color:var(--ink)}.primary{background:var(--blue);color:white}.danger{background:#ffe8e8;color:#a91d1d}.chip{background:white;border:1px solid var(--line)}
.app{width:min(1080px,100%);margin:auto;padding:22px 18px 70px}.hero{background:linear-gradient(135deg,#0b6bcb,#064b93);color:white;padding:26px;border-radius:22px;box-shadow:var(--shadow)}.hero h1{font-size:clamp(28px,5vw,44px);margin:0 0 8px;letter-spacing:-.03em}.hero p{margin:0;opacity:.9;line-height:1.55;max-width:760px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}.mode-card{cursor:pointer;transition:.18s}.mode-card:hover{transform:translateY(-2px);border-color:#9cc9f5}.mode-card h2,.card h2,.card h3{margin:0 0 8px}.mode-card p,.muted{color:var(--muted);line-height:1.45}.big-num{font-size:32px;font-weight:900;letter-spacing:-.03em}.kpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:18px}.kpi{background:white;border:1px solid var(--line);border-radius:16px;padding:15px}.kpi span{display:block;color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.04em}.kpi strong{display:block;font-size:25px;margin-top:4px}.section-title{margin:27px 0 12px}.topic-list,.sim-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.topic,.sim{background:white;border:1px solid var(--line);border-radius:16px;padding:15px;cursor:pointer;text-align:left}.topic:hover,.sim:hover{border-color:#8dbde9}.topic b,.sim b{display:block;margin-bottom:6px}.badge{display:inline-block;padding:5px 8px;border-radius:999px;background:var(--blue2);color:var(--blue);font-size:12px;font-weight:800}.controls{display:flex;gap:9px;flex-wrap:wrap;margin:14px 0}.controls select{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:white;font:inherit}.test-shell{max-width:900px;margin:auto}.test-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:12px}.test-title h1{margin:0;font-size:22px}.test-title p{margin:4px 0 0;color:var(--muted)}.progress{height:8px;background:#e5eaf1;border-radius:99px;overflow:hidden;margin:10px 0 18px}.progress>div{height:100%;background:var(--blue);transition:.2s}.question-card{padding:20px}.q-meta{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:12px}.q-title{font-size:clamp(18px,3.6vw,24px);line-height:1.36;margin:0 0 16px}.q-image{display:block;max-width:100%;max-height:430px;object-fit:contain;margin:0 auto 18px;border-radius:14px;border:1px solid var(--line);background:#fafafa}.options{display:grid;gap:10px}.option{width:100%;display:flex;gap:11px;align-items:flex-start;text-align:left;background:#fff;border:2px solid var(--line);border-radius:14px;padding:13px 14px;cursor:pointer;font-size:15px;line-height:1.4}.option:hover:not(:disabled){border-color:#8dbde9;background:#f7fbff}.opt-key{flex:0 0 29px;height:29px;border-radius:9px;display:grid;place-items:center;background:#edf2f7;font-weight:900}.option.correct{border-color:#54ae72;background:var(--greenbg)}.option.wrong{border-color:#e27474;background:var(--redbg)}.option:disabled{cursor:default;color:inherit}.feedback{margin-top:14px;padding:15px;border-radius:14px;line-height:1.5}.feedback.ok{background:var(--greenbg);border:1px solid #a8dbb8}.feedback.bad{background:var(--redbg);border:1px solid #f0b4b4}.explain{margin-top:8px;color:#475569}.next-row{display:flex;justify-content:space-between;gap:10px;margin-top:15px}.result-hero{text-align:center;padding:28px}.score-circle{width:118px;height:118px;border-radius:50%;display:grid;place-items:center;margin:0 auto 14px;font-size:31px;font-weight:900}.status-green{background:var(--greenbg);color:var(--green)}.status-yellow{background:var(--yellowbg);color:var(--yellow)}.status-red{background:var(--redbg);color:var(--red)}.mistakes{display:grid;gap:10px;margin-top:16px}.mistake{padding:12px;border-radius:12px;background:#fafbfc;border:1px solid var(--line)}.history{width:100%;border-collapse:collapse}.history th,.history td{padding:10px 8px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}.history th{color:var(--muted);font-size:12px;text-transform:uppercase}.empty{padding:30px;text-align:center;color:var(--muted)}.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(30px);opacity:0;background:#172033;color:white;padding:11px 15px;border-radius:12px;transition:.2s;z-index:50;pointer-events:none}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}.small{font-size:12px}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.spacer{flex:1}.search{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:13px;font:inherit;margin:10px 0 14px}.resume{margin-top:15px;background:#eef8ff;border:1px solid #b8d9f6}.footer-note{font-size:12px;color:var(--muted);text-align:center;margin-top:30px;line-height:1.5}
@media(max-width:760px){.grid,.kpis,.topic-list,.sim-list{grid-template-columns:1fr 1fr}.kpis{grid-template-columns:1fr 1fr}.test-head{flex-direction:column}.question-card{padding:15px}.app{padding-left:12px;padding-right:12px}.hero{padding:20px}.history{display:block;overflow-x:auto}}
@media(max-width:480px){.grid,.topic-list,.sim-list{grid-template-columns:1fr}.topbar{height:58px}.brand span:last-child{font-size:14px}.ghost{padding:9px 11px}.app{padding-top:14px}.hero h1{font-size:30px}.option{padding:12px}.q-image{max-height:330px}.next-row{flex-direction:column}.next-row button{width:100%}}
.top-actions{display:flex;gap:8px;align-items:center}.sync-card{max-width:720px;margin:auto}.sync-state{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:12px 0}.sync-dot{width:10px;height:10px;border-radius:50%;background:#94a3b8}.sync-dot.on{background:var(--green)}.sync-dot.err{background:var(--red)}.sync-key{width:100%;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;padding:12px;border:1px solid var(--line);border-radius:12px;background:#f8fafc;word-break:break-all}.warning-box{background:var(--yellowbg);border:1px solid #ecd58d;padding:13px;border-radius:13px;line-height:1.45}.success-box{background:var(--greenbg);border:1px solid #a8dbb8;padding:13px;border-radius:13px;line-height:1.45}.form-row{display:grid;gap:7px;margin:12px 0}.form-row input{padding:12px 13px;border:1px solid var(--line);border-radius:12px;font:inherit}.sync-actions{display:flex;gap:9px;flex-wrap:wrap}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.copy-btn{margin-top:8px}
@media(max-width:480px){.top-actions{gap:4px}.top-actions .ghost{padding:8px 9px;font-size:12px}}
/* v3 · temas PDF + historial detallado + repaso de fallos */
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.mistake-mode{border-color:#f2d48b;background:linear-gradient(180deg,#fff,#fffbef)}.disabled-card{opacity:.72}.badge-warn{background:var(--yellowbg);color:var(--yellow)}.topic-code{display:inline-block;font-size:11px;font-weight:900;color:var(--blue);margin-bottom:5px}.kpis-3{grid-template-columns:repeat(3,minmax(0,1fr))}.sep{border:0;border-top:1px solid var(--line);margin:20px 0}.center-controls{justify-content:center}.mini-btn{border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px 9px;font-weight:750;cursor:pointer}.mini-btn:hover{border-color:#8dbde9;background:#f7fbff}.history-wrap,.mistake-table-wrap{width:100%;overflow-x:auto}.mistake-table{min-width:760px}.mistake-table td:nth-child(3){min-width:320px}.mistake-question{margin:8px 0;line-height:1.45}.attempt-head{margin-top:14px}.attempt-head h1{margin:10px 0 5px}.topic .badge{margin-top:9px}
@media(max-width:900px){.grid-3{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.grid-3,.kpis-3{grid-template-columns:1fr}.history th,.history td{white-space:nowrap}.mistake-table td:nth-child(3){white-space:normal;min-width:260px}}

.level-strip{margin-top:12px;border:1px solid var(--line);border-radius:16px;padding:15px 17px;background:#fff;display:grid;grid-template-columns:minmax(230px,.9fr) minmax(300px,1.25fr);gap:22px;align-items:center;box-shadow:var(--shadow)}
.level-strip b{display:block;font-size:18px;margin:2px 0 4px}.level-strip p{margin:0;color:var(--muted);font-size:13px;line-height:1.4}.level-eyebrow{display:block;text-transform:uppercase;letter-spacing:.05em;font-size:11px;font-weight:900;color:var(--muted)}
.level-meter-label,.level-targets{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:11px;color:var(--muted)}.level-meter-label strong{font-size:17px;color:#172033}.level-targets{margin-top:6px}.level-meter{height:10px;border-radius:999px;background:#e9edf2;overflow:hidden;margin-top:5px}.level-meter>div{height:100%;background:#64748b;border-radius:inherit;transition:.25s}
.level-green{border-color:#9bd7ad;background:#f4fbf6}.level-green .level-meter>div{background:#238b45}.level-yellow{border-color:#f0d38b;background:#fffaf0}.level-yellow .level-meter>div{background:#bc7a00}.level-red{border-color:#efb0b0;background:#fff7f7}.level-red .level-meter>div{background:#c43c3c}.level-neutral{background:#f8fafc}
@media(max-width:760px){.level-strip{grid-template-columns:1fr;gap:12px}.level-targets{font-size:10px}}