:root{--fg:#1c1c28;--muted:#6b6b7b;--bg:#f6f6f8;--card:#ffffff;--line:#e3e3ea;--accent:#4a3fc4;--accent-fg:#fff;--ok:#0f7a4a}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.5}
.top{display:flex;justify-content:space-between;align-items:center;padding:14px 22px;background:var(--card);border-bottom:1px solid var(--line)}
.brand{font-weight:600;color:var(--fg);text-decoration:none}
.who{display:flex;gap:14px;align-items:center;color:var(--muted);font-size:.9rem}
.who form{margin:0}
.wrap{max-width:56rem;margin:0 auto;padding:28px 20px 60px}
h1{font-size:1.5rem;margin:0 0 1rem}
h2{font-size:1.15rem;margin:0 0 .6rem}
h3{font-size:.95rem;margin:1.1rem 0 .4rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.03em}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:0 0 18px}
.card.narrow{max-width:26rem;margin:60px auto}
label{display:block;margin:.8rem 0;font-size:.92rem;font-weight:500}
input{display:block;width:100%;margin-top:.3rem;padding:.6rem .7rem;border:1px solid var(--line);border-radius:8px;font:inherit;background:#fff}
button{font:inherit;cursor:pointer}
.primary{background:var(--accent);color:var(--accent-fg);border:0;border-radius:8px;padding:.65rem 1.1rem;margin-top:1rem;font-weight:600}
.link{background:none;border:0;color:var(--accent);padding:0;font-size:.9rem;underline:none}
.link.small{font-size:.82rem}
.inline{display:inline}
.chapters{list-style:none;padding:0;margin:0}
.chapters li{padding:.5rem 0;border-bottom:1px solid var(--line)}
.chapters li:last-child{border-bottom:0}
.chapters a{color:var(--fg);text-decoration:none}
.chapters a:hover{color:var(--accent)}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.tag{font-size:.75rem;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.05rem .5rem}
.done{font-size:.78rem;color:var(--ok);font-weight:600}
.alert{background:#fff1f1;border:1px solid #f3c2c2;color:#8a1f1f;padding:.6rem .8rem;border-radius:8px;font-size:.9rem}

.actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin:0 0 22px}
.button{display:inline-block;background:var(--accent);color:var(--accent-fg);text-decoration:none;padding:.6rem 1rem;border-radius:8px;font-weight:600;font-size:.92rem}
.button.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.course{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:26px 28px}
.course h1{font-size:1.45rem}
.course h2{font-size:1.2rem;margin:1.6rem 0 .6rem;padding-bottom:.3rem;border-bottom:1px solid var(--line)}
.course h3{font-size:1rem;margin:1.2rem 0 .4rem;text-transform:none;letter-spacing:0;color:var(--fg)}
.course p{margin:.7rem 0}
.course ul,.course ol{margin:.6rem 0 .6rem 1.2rem;padding:0}
.course li{margin:.3rem 0}
.course blockquote{margin:.9rem 0;padding:.7rem .9rem;background:#f3f2fb;border-left:3px solid var(--accent);border-radius:0 8px 8px 0}
.course blockquote p{margin:.25rem 0}
.course table{border-collapse:collapse;width:100%;margin:.9rem 0;font-size:.92rem}
.course th,.course td{border:1px solid var(--line);padding:.45rem .55rem;text-align:left}
.course th{background:#f3f2fb}
.course code{background:#f1f1f5;padding:.1rem .3rem;border-radius:4px;font-size:.9em}
.course hr{border:0;border-top:1px solid var(--line);margin:1.4rem 0}
.qnum{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin:0 0 .3rem}
.qtext{font-weight:600;margin:0 0 .8rem}
.options{display:flex;flex-direction:column;gap:.5rem}
.opt{display:flex;gap:.6rem;align-items:flex-start;margin:0;font-weight:400;padding:.55rem .7rem;border:1px solid var(--line);border-radius:8px;cursor:pointer}
.opt:hover{border-color:var(--accent)}
.opt input{margin-top:.2rem}
.score{font-size:2rem;font-weight:700;margin:0 0 .3rem}
.scorelist{list-style:none;padding:0;margin:0}
.scorelist li{padding:.5rem 0;border-bottom:1px solid var(--line)}
.scorelist li.ok{color:#0f7a4a}
.scorelist li.ko{color:#8a1f1f}