:root{--bg:#f3f7f6;--panel:#fff;--text:#173630;--muted:#506963;--accent:#086c60;--line:#d5e3df;--soft:#e3f1ec;--bad:#9b3434;--shadow:0 12px 36px #17363008;color-scheme:light}
html[data-theme=dark]{--bg:#101e1d;--panel:#192b29;--text:#e5f2ed;--muted:#adc6be;--accent:#75d5c0;--line:#36524b;--soft:#233e36;--bad:#ffb4ab;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 'Segoe UI',system-ui,sans-serif}button,input{font:inherit}a{color:var(--accent)}button{cursor:pointer;min-height:48px;border:1px solid transparent;background:var(--accent);color:var(--panel);border-radius:12px;padding:10px 20px;font-weight:650}button:disabled{opacity:.55;cursor:default}button.quiet,.tabs button,.text-button{background:transparent;color:var(--text);border-color:var(--line)}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.skip{position:absolute;top:-100px}.skip:focus{top:8px;background:var(--panel);z-index:10;padding:12px}.top{max-width:1180px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:24px 28px;gap:16px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text)}.brand strong{font-size:24px;letter-spacing:-1px}.brand small{display:block;color:var(--muted);font-size:12px;letter-spacing:1px}.mark{width:48px;height:48px;border-radius:15px;background:var(--accent);color:var(--panel);display:grid;place-items:center;font:700 30px Georgia,serif}.header-links{display:flex;align-items:center;gap:20px;font-size:14px}.tabs{display:flex;gap:8px;max-width:1124px;margin:auto;padding:0 0 20px;border-bottom:1px solid var(--line)}.tabs button{border:0;border-radius:8px;color:var(--muted)}.tabs button[aria-current]{background:var(--soft);color:var(--accent)}.shell{max-width:1124px;margin:auto;padding-bottom:30px}.privacy{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);padding:18px 0}.privacy a{margin-left:auto}.dot{height:7px;width:7px;background:var(--accent);border-radius:50%}#notice:empty{display:none}#notice{padding:14px 18px;border:1px solid var(--line);background:var(--panel);border-radius:12px}h1{font-size:clamp(32px,5vw,46px);line-height:1.16;letter-spacing:-1.5px;margin:12px 0 18px}h2{font-size:24px;line-height:1.35;margin:0 0 12px}h3{margin:0}.eyebrow{font-size:12px;letter-spacing:1.7px;text-transform:uppercase;color:var(--accent);font-weight:700}.muted,.lead{color:var(--muted)}.lead{max-width:650px;font-size:18px}.hero{padding:26px 0 22px}.cards{display:grid;grid-template-columns:1.5fr 1fr;gap:20px}.card{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:var(--shadow)}.daily{background:var(--soft);position:relative}.daily h2{font-size:32px;letter-spacing:-.7px;margin-top:20px}.daily .count{font-size:58px;font-weight:700;letter-spacing:-3px;line-height:1.2;margin:18px 0 10px}.count small{font-size:16px;letter-spacing:0;font-weight:400;color:var(--muted)}.stack{display:grid;gap:20px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}.stat{padding:20px;border:1px solid var(--line);border-radius:16px}.stat strong{display:block;font-size:28px}.stat span{font-size:13px;color:var(--muted)}.topics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.topic{text-align:left;background:var(--panel);border:1px solid var(--line);color:var(--text);padding:20px;min-height:120px}.topic span{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:8px}.section-heading{margin:30px 0 16px}.session{max-width:800px;margin:20px auto}.session-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}progress{width:100%;height:8px;accent-color:var(--accent);display:block;margin-bottom:24px}.question{font-size:25px;line-height:1.5;letter-spacing:-.4px;margin:20px 0}.choices{border:0;padding:0;margin:20px 0}.choices legend{color:var(--muted);font-size:14px;margin-bottom:16px}.option{display:flex;align-items:flex-start;gap:14px;padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--panel);margin-bottom:12px;cursor:pointer;min-height:56px}.option:has(input:checked){border-color:var(--accent);background:var(--soft)}.option input{width:20px;height:20px;flex-shrink:0;margin:4px 0;accent-color:var(--accent)}.rationale{margin-top:24px;border-top:1px solid var(--line);padding-top:22px}.rationale p{white-space:pre-line}.result{color:var(--accent)}.result.incorrect{color:var(--bad)}.explanation{padding:12px 0;border-bottom:1px solid var(--line)}.explanation strong{display:block}.source-list{overflow-wrap:anywhere}.list{display:grid;gap:12px}.row{display:flex;justify-content:space-between;gap:20px;align-items:center}.row p{margin:5px 0;color:var(--muted)}footer{margin-top:48px;padding-top:24px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}footer strong{color:var(--text);margin-right:12px}footer p{max-width:850px}footer a{margin-left:20px}dialog{max-width:460px;width:calc(100% - 32px);background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:20px;padding:28px}dialog::backdrop{background:#102c2870}.loading{padding:60px;text-align:center}.empty{padding:40px 28px;text-align:center}
@media(max-width:760px){.top{padding:20px}.header-links{gap:8px}.header-links a{max-width:95px;line-height:1.4}.shell{padding:0 20px 24px}.tabs{padding:0 14px 12px;gap:0;overflow-x:auto}.tabs button{padding:10px 12px;white-space:nowrap;font-size:14px}.privacy{flex-wrap:wrap}.privacy a{margin-left:17px}.cards{grid-template-columns:1fr}.topics{grid-template-columns:repeat(2,1fr)}.card{padding:22px;border-radius:18px}.stats{gap:8px}.stat{padding:14px 10px}.stat strong{font-size:25px}.hero{padding-top:15px}.question{font-size:22px}.row{align-items:flex-start;flex-direction:column}.row button{width:100%}.session-top{font-size:14px}.session-top button{padding:8px 12px}.actions button{flex:1}footer a{display:block;margin:12px 0}.topic{padding:16px}.source-list{padding-left:20px}}