:root{--ink:#15231f;--muted:#64716c;--paper:#f5f7f2;--card:#fff;--line:#dfe6df;--green:#176b4d;--mint:#dff5e8;--orange:#ee7a32;--shadow:0 18px 60px rgba(30,54,44,.09)}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.65}.topbar{min-height:72px;padding:0 max(24px,calc((100vw - 1180px)/2));display:flex;align-items:center;justify-content:space-between;background:rgba(245,247,242,.94);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;backdrop-filter:blur(12px)}.brand{font-size:1.45rem;font-weight:900;text-decoration:none;color:var(--ink);letter-spacing:-.04em}.brand span{color:var(--orange)}nav{display:flex;gap:22px;align-items:center}nav a,.link-button{color:var(--ink);text-decoration:none;font:inherit;font-weight:650;border:0;background:none;cursor:pointer}.inline{display:inline}main{max-width:1180px;margin:auto;padding:64px 24px 96px}.hero{display:grid;grid-template-columns:1.45fr .75fr;gap:72px;align-items:center;min-height:620px}.eyebrow{text-transform:uppercase;letter-spacing:.16em;color:var(--green);font-size:.78rem;font-weight:800}.hero h1,.page-head h1,.auth-card h1{font-size:clamp(2.4rem,5vw,5.1rem);line-height:1.05;letter-spacing:-.055em;margin:16px 0 26px}.hero h1 em{color:var(--green);font-style:normal}.hero>div>p:not(.eyebrow){max-width:680px;font-size:1.12rem;color:var(--muted)}.hero-card,.panel,.auth-card,.notice{background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}.hero-card{padding:32px}.hero-card span{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--mint);color:var(--green);font-weight:900}.hero-card h2{display:inline;margin-left:12px;font-size:1.1rem}.hero-card p{margin:4px 0 24px 50px;color:var(--muted)}.primary{display:inline-flex;align-items:center;justify-content:center;margin-top:16px;padding:12px 21px;border:0;border-radius:12px;background:var(--green);color:white;text-decoration:none;font-weight:800;cursor:pointer}.notice{padding:24px 30px;display:flex;gap:24px;align-items:center}.notice p{margin:0;color:var(--muted)}footer{padding:26px;text-align:center;border-top:1px solid var(--line);color:var(--muted);font-size:.88rem}.auth-card{max-width:520px;margin:50px auto;padding:42px}.auth-card h1{font-size:2.4rem}.auth-card form,.question form{display:grid;gap:18px}label{display:grid;gap:7px;font-weight:700}input,select{width:100%;padding:12px 14px;border:1px solid #b9c6bf;border-radius:10px;background:white;color:var(--ink);font:inherit}.muted{color:var(--muted)}.error{padding:13px 16px;background:#fff0eb;color:#9a361d;border-left:4px solid var(--orange);border-radius:8px}.page-head{margin-bottom:38px}.page-head h1{font-size:clamp(2.3rem,4vw,4.2rem)}.page-head p:last-child{color:var(--muted)}.grid.two{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}.panel{padding:28px;margin-bottom:24px}.panel h2{margin-top:0}.pill{display:inline-block;padding:5px 10px;border-radius:99px;background:var(--mint);color:var(--green);font-weight:800;font-size:.82rem}.mastery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.mastery-grid>div{padding:18px;border:1px solid var(--line);border-radius:16px}.mastery-grid p{min-height:48px;margin:0}.mastery-grid strong{font-size:2rem}.mastery-grid span{color:var(--muted);font-size:.8rem}progress{width:100%;accent-color:var(--green)}.question{max-width:820px}.options{display:grid;gap:10px}.options label{display:block}.options input{width:auto;margin-right:8px}.lesson .prose{white-space:pre-wrap}.report-row{display:grid;grid-template-columns:1fr auto auto;gap:20px;padding:13px 0;border-bottom:1px solid var(--line)}table{width:100%;border-collapse:collapse}th,td{padding:12px;text-align:left;border-bottom:1px solid var(--line)}:focus-visible{outline:3px solid #f2a66f;outline-offset:3px}@media(max-width:800px){.topbar{height:auto;padding:14px 18px;align-items:flex-start}.topbar nav{gap:10px;flex-wrap:wrap;justify-content:flex-end;font-size:.85rem}.hero,.grid.two{grid-template-columns:1fr}.hero{gap:24px;min-height:auto}.mastery-grid{grid-template-columns:1fr}main{padding:42px 18px 72px}.notice{align-items:flex-start;flex-direction:column}.panel{overflow:auto}}