:root{--bg:#f3f5fb;--card:#fff;--ink:#14182b;--muted:#5d6479;--line:#dfe3ee;--pri:#1f4fd1;--pri2:#173da6;--ok:#14935a;--okbg:#e5f7ee;--bad:#d1342f;--badbg:#fdecea;--sel:#e8eeff;--shadow:0 6px 24px rgba(20,30,70,.08);--gold:#f4a20c;color-scheme:light}
:root.dark{--bg:#0f1220;--card:#1a1f33;--ink:#eef1fb;--muted:#a3abc4;--line:#2d3452;--pri:#5b8cff;--pri2:#7aa2ff;--ok:#3ccf8e;--okbg:#14382a;--bad:#ff6b63;--badbg:#3d1d1f;--sel:#243058;--shadow:0 6px 24px rgba(0,0,0,.35);color-scheme:dark}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;min-height:100vh;overflow-x:hidden}
.skip{position:absolute;left:-999px;top:0;background:var(--pri);color:#fff;padding:8px 12px;z-index:99}
.skip:focus{left:8px}
button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--pri);outline-offset:2px}
.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top));background:var(--card);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;background:none;border:0;font-weight:800;font-size:18px;cursor:pointer;padding:4px}
.brand img{width:28px;height:28px}
.topactions{display:flex;gap:6px}
.iconbtn{width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:var(--card);font-size:20px;cursor:pointer}
main{max-width:720px;margin:0 auto;padding:16px 16px 48px}
.screen[hidden]{display:none}
.hero h1{font-size:30px;margin:8px 0 4px;letter-spacing:-.5px}
.lead{color:var(--muted);margin:0 0 16px}
h1{font-size:26px}
h2{font-size:20px;margin:0 0 10px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow);margin-bottom:14px}
.muted{color:var(--muted);font-size:15px}
.btn{border:0;border-radius:14px;padding:12px 18px;min-height:48px;font-weight:700;cursor:pointer;background:var(--sel);color:var(--ink)}
.btn.primary{background:var(--pri);color:#fff}
.btn.primary:hover{background:var(--pri2)}
.btn.primary:disabled{opacity:.45;cursor:not-allowed}
.btn.big{min-height:56px;font-size:18px;width:100%}
.btn.ghost{background:transparent;border:1px solid var(--line)}
.btn.danger{color:var(--bad);border-color:var(--bad)}
kbd{font:600 12px ui-monospace,monospace;border:1px solid currentColor;border-radius:5px;padding:1px 5px;opacity:.75;margin-left:6px}
.hint{text-align:center;margin-top:10px}
@media (hover:none){.hint,.btn kbd{display:none}}
fieldset{border:0;padding:0;margin:0 0 12px}
legend{font-weight:700;margin-bottom:8px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1.5px solid var(--line);background:var(--card);border-radius:999px;padding:9px 14px;min-height:44px;cursor:pointer;font-size:15px;font-weight:600}
.chip[aria-pressed=true]{background:var(--pri);border-color:var(--pri);color:#fff}
.chip .n{opacity:.7;font-weight:500;margin-left:4px}
.switch{display:flex;gap:10px;align-items:center;min-height:44px;cursor:pointer;font-weight:600}
.switch input{width:22px;height:22px;accent-color:var(--pri)}
.resume{display:flex;gap:14px;align-items:center;justify-content:space-between;border:2px solid var(--pri)}
.resume>div{flex:1}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
@media (max-width:560px){.grid2{grid-template-columns:1fr}}
.tile{display:flex;flex-direction:column;gap:6px;text-align:left;cursor:pointer;margin:0}
.tile:hover{border-color:var(--pri)}
.tileicon{font-size:28px}
.pill{display:inline-block;background:var(--bad);color:#fff;border-radius:999px;font-size:13px;padding:1px 8px;margin-left:4px;vertical-align:2px}
.about summary{cursor:pointer;font-weight:700;min-height:28px}
.about p{font-size:15px}
.tag{display:inline-block;font-size:12px;font-weight:700;border-radius:6px;padding:3px 8px;margin:0 6px 6px 0;background:var(--sel);color:var(--ink)}
.tag.off{background:#0b6b3a;color:#fff}
.tag.com{background:var(--gold);color:#221400}
.bar{height:14px;border-radius:999px;background:var(--line);overflow:hidden}
.bar span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--ok),#2ec4b6);border-radius:999px;transition:width .4s ease}
.bar.small{height:8px;margin-top:8px}
.gamehead{margin-bottom:12px}
.stats{display:flex;justify-content:space-between;align-items:center;font-size:18px;margin-bottom:8px}
.stats b{font-size:22px}
.streak{font-weight:800;padding:4px 10px;border-radius:999px;background:var(--sel);transition:transform .2s}
.streak.hot{background:#ffe2c2;color:#a14a00}
:root.dark .streak.hot{background:#4a2a10;color:#ffb46b}
.streak.pop{animation:pop .45s}
@keyframes pop{50%{transform:scale(1.35)}}
.substats{display:flex;justify-content:space-between;margin-top:6px}
.qcard{padding:18px 18px 12px}
.qimg{margin:4px 0 12px;display:flex;justify-content:center;background:var(--bg);border-radius:14px;padding:12px}
.qimg img{max-width:100%;max-height:190px;height:auto}
.qimg img[src*="/diag/"]{max-height:230px;border-radius:8px}
.qimg img[src*="/signs/"]{height:150px;width:auto;max-width:100%;max-height:none;margin:8px 0}
.qimg img[src$="hospital.svg"]{height:190px}
.qtext{font-size:21px;line-height:1.35;margin:4px 0 14px}
.options{display:grid;gap:10px}
.opt{display:flex;align-items:center;gap:12px;text-align:left;width:100%;min-height:60px;padding:12px 14px;border-radius:14px;border:2px solid var(--line);background:var(--card);cursor:pointer;font-size:17px;transition:border-color .15s,background .15s,transform .1s}
.opt:hover{border-color:var(--pri)}
.opt:active{transform:scale(.99)}
.opt .k{flex:none;width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:var(--sel);font-weight:800;font-size:15px}
.opt[aria-checked=true]{border-color:var(--pri);background:var(--sel)}
.opt[aria-checked=true] .k{background:var(--pri);color:#fff}
.opt.correct{border-color:var(--ok);background:var(--okbg)}
.opt.correct .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--badbg)}
.actions{display:grid;grid-template-columns:auto 1fr;gap:10px;margin-top:6px}
.qcard.flash-ok{animation:okflash .6s}
.qcard.shake{animation:shake .45s}
@keyframes okflash{0%{box-shadow:0 0 0 0 rgba(20,147,90,.6)}100%{box-shadow:0 0 0 18px rgba(20,147,90,0)}}
@keyframes shake{20%,60%{transform:translateX(-8px)}40%,80%{transform:translateX(8px)}}
.overlay{position:fixed;inset:0;background:rgba(8,12,30,.55);display:flex;align-items:flex-end;justify-content:center;z-index:20;padding:12px;padding-bottom:max(12px,env(safe-area-inset-bottom))}
.overlay[hidden]{display:none}
@media (min-width:600px){.overlay{align-items:center}}
.modal{background:var(--card);border-radius:22px;max-width:520px;width:100%;padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.4);animation:up .25s ease;max-height:90vh;overflow:auto}
@keyframes up{from{transform:translateY(40px);opacity:0}}
.modalicon{width:52px;height:52px;border-radius:50%;background:var(--badbg);color:var(--bad);display:grid;place-items:center;font-size:24px;font-weight:900;margin-bottom:8px}
.modal h2{font-size:24px;margin:0 0 12px}
.modal p{margin:0 0 12px}
.yours,.right{display:flex;flex-direction:column;gap:2px;padding:10px 12px;border-radius:12px}
.yours{background:var(--badbg)}
.right{background:var(--okbg)}
.yours span,.right span{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.yours strong{color:var(--bad);text-decoration:line-through;text-decoration-thickness:2px}
.right strong{color:var(--ok)}
.why{font-size:17px}
.src{font-size:13px}
.requeue{font-size:14px;font-weight:600;color:var(--muted);background:var(--sel);padding:8px 12px;border-radius:10px}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ok);color:#fff;font-weight:800;padding:12px 20px;border-radius:999px;box-shadow:var(--shadow);z-index:15;font-size:17px;max-width:92vw;text-align:center}
.toast[hidden]{display:none}
#confetti{position:fixed;inset:0;pointer-events:none;z-index:30;width:100%;height:100%}
.win{text-align:center;padding:26px 18px}
.win .trophy{font-size:56px;margin:0}
.win h1{margin:6px 0}
.statgrid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}
.statgrid div{background:var(--bg);border-radius:14px;padding:12px}
.statgrid b{display:block;font-size:24px}
.pass{color:var(--ok)}.fail{color:var(--bad)}
.rowhead{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.missedlist .card{padding:14px}
.missedlist img{max-height:90px;max-width:100%;display:block;margin-bottom:8px}
.missedlist .ans{color:var(--ok);font-weight:700}
.missedlist .cnt{float:right}
.review h3{margin:18px 0 8px;text-align:left}
.review .card{text-align:left}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
@media (max-width:420px){body{font-size:16px}.qtext{font-size:19px}.hero h1{font-size:26px}main{padding:12px 12px 40px}}

.chapters{margin-top:12px}
.chapters summary{cursor:pointer;font-weight:700;min-height:44px;display:flex;align-items:center;color:var(--pri)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.review img{display:block;margin-bottom:8px}