:root{--bg:#f7f8f6;--card:#fff;--ink:#1b2421;--muted:#5b6662;--brand:#0f5e57;--brand2:#e7f2f0;--ok:#1e7a3c;--okbg:#e6f4ea;--bad:#a12a2a;--badbg:#fbeaea;--line:#dfe4e1;--warn:#fff6dd;--radius:14px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.5;font-size:17px}
a{color:var(--brand)}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:9}
.top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{font-weight:700;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px}
.brand small{color:var(--muted);font-weight:600}
.logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--brand);color:#fff;font-size:13px}
.top nav{display:flex;gap:14px;font-size:15px}
.top nav a{text-decoration:none;font-weight:600}
.notice{background:var(--warn);border-bottom:1px solid #eedfae;padding:8px 16px;font-size:14px}
.draft{background:#fdecec;border:1px solid #f1b8b8;border-radius:10px;padding:10px 12px;font-size:14px}
main,.page{max-width:720px;margin:0 auto;padding:16px}
main:focus{outline:none}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:0 0 14px}
h1{font-size:1.6rem;line-height:1.25;margin:.2em 0 .4em}
h2{font-size:1.2rem;margin:.8em 0 .5em}
.muted{color:var(--muted)}
.small{font-size:14px}
.btn{display:inline-block;border:0;border-radius:10px;padding:12px 18px;font-size:16px;font-weight:600;cursor:pointer;text-decoration:none;text-align:center;min-height:44px}
.btn.primary{background:var(--brand);color:#fff}
.btn.ghost{background:var(--brand2);color:var(--brand)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:6px 0}
.grid{display:grid;grid-template-columns:1fr;gap:10px}
.topic{display:flex;justify-content:space-between;align-items:center;gap:10px;text-decoration:none;color:inherit;margin:0}
.badge{font-size:12px;font-weight:700;padding:3px 8px;border-radius:99px;background:var(--brand2);color:var(--brand);white-space:nowrap}
.badge.lock{background:#eee;color:#555}
.progress{height:8px;background:var(--line);border-radius:99px;overflow:hidden;margin:8px 0}
.progress>span{display:block;height:100%;background:var(--brand)}
.qtext{font-size:1.15rem;font-weight:600;margin:.3em 0 .2em}
.trans{color:var(--muted);font-size:15px;margin:0 0 10px}
.opts{list-style:none;padding:0;margin:10px 0;display:grid;gap:8px}
.opt{width:100%;text-align:left;background:#fff;border:2px solid var(--line);border-radius:12px;padding:12px 14px;font-size:16px;cursor:pointer;min-height:48px;color:var(--ink)}
.opt:hover{border-color:var(--brand)}
.opt.sel{border-color:var(--brand);background:var(--brand2)}
.opt.right{border-color:var(--ok);background:var(--okbg)}
.opt.wrong{border-color:var(--bad);background:var(--badbg)}
.opt .tr{display:block;color:var(--muted);font-size:14px;margin-top:2px}
.explain{border-left:4px solid var(--brand);background:var(--brand2);padding:10px 12px;border-radius:8px;font-size:15px}
.explain q{font-style:italic}
.toggle{display:flex;align-items:center;gap:8px;font-size:15px}
select{font-size:15px;padding:6px;border-radius:8px;border:1px solid var(--line)}
.timer{font-variant-numeric:tabular-nums;font-weight:700}
.result{font-size:2rem;font-weight:800}
.pass{color:var(--ok)}.fail{color:var(--bad)}
form .field{display:flex;flex-direction:column;gap:6px;margin:8px 0}
input[type=email],input[type=text]{font-size:16px;padding:12px;border:2px solid var(--line);border-radius:10px;min-height:44px}
.foot{max-width:720px;margin:10px auto 30px;padding:0 16px;color:var(--muted);font-size:14px}
.review li{margin:0 0 12px}
.price{font-size:1.8rem;font-weight:800;margin:.2em 0}
.price .small{display:block;font-weight:400}
.tag{display:inline-block;font-size:12px;background:#fff3cd;border:1px solid #eedfae;border-radius:6px;padding:1px 6px;margin-left:6px;vertical-align:middle}
table{border-collapse:collapse;width:100%;font-size:14px}td,th{border:1px solid var(--line);padding:6px;text-align:left;vertical-align:top}