:root{font-family:Inter,"Microsoft YaHei",system-ui,sans-serif;color:#203a35;background:#f5f6f1;font-size:16px;--green:#164d43;--muted:#66766f;--line:#dce2d9}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer;border:1px solid transparent;border-radius:10px;background:var(--green);color:white;padding:12px 18px;min-height:46px}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #d4a55a;outline-offset:3px}a{color:var(--green)}button.quiet{background:transparent;color:var(--green);border-color:var(--line)}header{max-width:1240px;margin:auto;padding:24px 34px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-family:Georgia,serif;font-size:36px;font-weight:bold}.brand span{font:600 17px system-ui}.brand small{display:block;font-weight:400;color:var(--muted);font-size:11px;margin-top:4px;letter-spacing:3px}main{max-width:1172px;margin:auto;padding:0 0 60px}.intro{padding:36px 0 26px;border-top:1px solid var(--line)}.eyebrow{font-size:11px;letter-spacing:2px;color:#7a8f7c;font-weight:700}h1{font-size:clamp(30px,4vw,48px);font-weight:600;letter-spacing:-1px;margin:18px 0}p{line-height:1.8}.intro>p:not(.eyebrow){color:var(--muted)}.stats{display:flex;gap:46px;margin-top:28px}.stats strong{display:block;font-size:27px;font-weight:550}.stats span{color:var(--muted);font-size:12px}.tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin:10px 0 28px}.tabs button{background:none;color:var(--muted);border-radius:0;padding:16px 4px;border-bottom:3px solid transparent}.tabs .active{border-bottom-color:var(--green);color:var(--green);font-weight:bold}.filters{display:flex;gap:14px}label{display:block;color:var(--muted);font-size:12px}.filters label{flex:1}input,select{width:100%;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px;color:#243e36;margin-top:7px;min-height:46px}.searchrow{display:flex;align-items:end;gap:12px;margin:10px 0 23px}.searchrow input{flex:1}.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:26px}#question{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;min-height:440px;touch-action:pan-y;box-shadow:0 6px 30px #203a3505}#guide{padding:8px 5px;color:var(--muted);font-size:13px}#guide h3{color:var(--green);font-size:20px}hr{border:0;border-top:1px solid var(--line);margin:24px 0}.question-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.badge{font-size:11px;color:#7d5b22;background:#f8edda;padding:5px 8px;border-radius:5px}.meta{font-size:12px;color:var(--muted);line-height:1.8}#question h2{font-size:21px;line-height:1.7;margin:22px 0}.options{display:grid;gap:11px}.option{text-align:left;background:#fff;color:#30433d;border:1px solid var(--line);border-radius:10px;line-height:1.6;display:flex;gap:12px;padding:14px 16px}.option.selected{background:#edf5ee;border-color:#448370}.option.correct{background:#e4f2e9;border-color:#3b8965}.option.wrong{background:#fff0eb;border-color:#bd7260}.option b{min-width:19px}.actions{display:flex;align-items:center;gap:12px;margin-top:24px}.navbuttons{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:20px;margin-top:24px}.navbuttons button{flex:1}.explanation{margin-top:24px;background:#f5f7f2;border-left:3px solid #718d70;padding:18px;line-height:1.9;font-size:14px;overflow-wrap:anywhere}.source{font-size:12px;color:var(--muted);margin-top:12px}.muted{color:var(--muted);font-size:13px}.section-head{display:flex;justify-content:space-between;align-items:center}.prose{background:white;border:1px solid var(--line);border-radius:14px;padding:32px;line-height:1.9;overflow-wrap:anywhere}.prose h2{border-top:1px solid var(--line);padding-top:26px}.prose table{display:block;overflow-x:auto;border-collapse:collapse;max-width:100%;font-size:14px}.prose td,.prose th{border:1px solid var(--line);padding:10px;min-width:130px;vertical-align:top}.prose details{margin:10px 0}.prose img{max-width:100%}#coverage-body details{border-bottom:1px solid var(--line);padding:16px 0}summary{cursor:pointer;line-height:1.8}#coverage-body .slide{padding:15px;background:#fff;margin:10px 0;border-radius:8px;font-size:14px}pre{white-space:pre-wrap;font:inherit;color:var(--muted)}#history>div{padding:16px 0;border-bottom:1px solid var(--line);font-size:14px}dialog{border:0;border-radius:18px;max-width:440px;width:calc(100% - 32px);padding:30px;color:#203a35}dialog::backdrop{background:#102c2566}dialog button{margin-top:16px}#login-error{color:#a14e38}footer{text-align:center;padding:25px;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#164d43;color:white;padding:12px 20px;border-radius:10px;display:none;z-index:9;max-width:90vw}
@media(max-width:1230px){main{margin:0 28px}}@media(max-width:700px){header{padding:18px 18px}.brand{font-size:28px}.brand span{font-size:15px}header button{font-size:12px;padding:8px 10px}main{margin:0 16px;padding-bottom:30px}.intro{padding:22px 0 18px}.intro>p{font-size:13px}.stats{gap:0;justify-content:space-between}.stats strong{font-size:23px}.stats span{font-size:11px}.tabs{gap:0;justify-content:space-between;position:sticky;top:0;background:#f5f6f1;z-index:2;margin-bottom:20px}.tabs button{font-size:14px;padding:14px 5px}.filters{display:grid;grid-template-columns:1fr 1fr;gap:10px}select{font-size:14px}.searchrow{gap:8px}.searchrow button{font-size:12px;padding:10px;white-space:nowrap}.searchrow input{min-width:0;font-size:14px}.practice-layout{display:block}#guide{padding:16px 4px}#guide hr,#guide .eyebrow,#guide h3{display:none}#question{padding:21px 16px;border-radius:13px;min-height:400px}#question h2{font-size:19px;margin:20px 0;line-height:1.7}.option{font-size:15px;padding:14px 12px;min-height:52px}.actions{flex-wrap:wrap}.navbuttons{position:sticky;bottom:0;background:white;padding-bottom:env(safe-area-inset-bottom);z-index:1}.prose{padding:18px;font-size:15px}.section-head{align-items:start;gap:10px}.section-head button{font-size:12px}footer{font-size:11px;padding-bottom:calc(22px + env(safe-area-inset-bottom))}input,select{font-size:16px}}