:root{color-scheme:light;--green:#176552;--deep:#143f36;--green-light:#edf6f1;--ink:#1c302b;--muted:#61716c;--line:#dce5e0;--red:#a74033;--paper:#fff;--page:#f3f6f5;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px}
*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--ink);line-height:1.65}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button,input,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #d39b2a;outline-offset:4px}h1,h2,h3,p{margin:0}button svg{flex-shrink:0}button{transition:background .15s,border-color .15s}progress{accent-color:var(--green)}.skip{position:absolute;left:16px;top:-80px;z-index:5;background:white;padding:10px}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.topbar{max-width:1280px;padding:28px 36px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:14px}.brand-icon{width:48px;height:48px;display:grid;place-items:center;background:var(--green);color:#fff;border-radius:13px;font-family:serif;font-size:1.65rem}.brand h1{font-size:1.55rem;letter-spacing:.05em;font-weight:750;line-height:1.35}.brand p{color:var(--muted);font-size:.875rem;margin-top:3px}.signature{font-size:.75rem;color:var(--muted);border-left:2px solid var(--green);padding-left:12px}.signature b{display:block;font-size:.8125rem;letter-spacing:.06em;color:var(--deep)}main{max-width:1280px;margin:auto;padding:10px 36px 0}.workspace{display:grid;grid-template-columns:272px minmax(0,1fr);gap:36px;align-items:start}.practice-sidebar{padding-top:7px}.sidebar-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.eyebrow{font-size:.875rem;color:var(--green);font-weight:700;letter-spacing:.09em}.total{font-size:.875rem;color:var(--muted)}.types{display:grid;gap:12px}.type-button{width:100%;display:flex;align-items:center;gap:13px;text-align:left;border:1px solid var(--line);background:var(--paper);border-radius:13px;padding:18px;color:var(--ink)}.type-button:hover{border-color:var(--green)}.type-button.active{background:var(--green);border-color:var(--green);color:white;box-shadow:0 5px 14px #17655212}.type-number{font-size:.875rem;color:#778f85;align-self:flex-start;padding-top:2px}.active .type-number{color:#bddecf}.type-copy{display:flex;flex-direction:column;gap:2px}.type-copy b{font-size:1.15rem;font-weight:650}.type-copy small{font-size:.875rem;color:var(--muted)}.active .type-copy small{color:#d4e9df}.type-check{margin-left:auto;display:flex}.practice-actions{display:grid;gap:4px;margin:22px 0}.button{border:1px solid transparent;border-radius:10px;padding:12px 19px;font-size:1rem;line-height:1.5;font-weight:650;min-height:50px;display:inline-flex;align-items:center;justify-content:center;gap:10px;text-decoration:none}.primary{background:var(--green);color:#fff}.primary:hover:not(:disabled){background:var(--deep)}.secondary{border-color:#cbdad2;background:#fff;color:var(--deep)}.secondary:hover:not(:disabled){background:var(--green-light);border-color:#88ab99}.text-button{background:transparent;color:var(--green);font-weight:550}.count{border-radius:20px;padding:0 8px;font-size:.875rem;background:#e0ebe4}.round-stats{border-top:1px solid var(--line);padding-top:25px}.round-stats h2{font-size:1rem;font-weight:650}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:17px 0}.stats-grid>div{display:flex;flex-direction:column;gap:1px}.stats-grid strong{font-size:1.6rem;line-height:1.4;font-weight:700;font-variant-numeric:tabular-nums}.stats-grid span{font-size:.875rem;color:var(--muted)}.stats-grid .wrong-number{color:var(--red)}progress{display:block;width:100%;height:6px;border:0;border-radius:10px;overflow:hidden;background:#dfe8e2}progress::-webkit-progress-bar{background:#dfe8e2}progress::-webkit-progress-value{background:var(--green);border-radius:10px}.round-stats p{font-size:.875rem;color:var(--muted);margin-top:10px}.save-note{font-size:.875rem;color:var(--muted);line-height:1.7;margin-top:25px}
.practice-main{min-width:0;scroll-margin-top:15px}.section-top{display:flex;justify-content:space-between;align-items:center;margin:0 0 18px}.section-top h2{font-size:1.55rem;margin-top:2px;line-height:1.4}.order-label{color:var(--muted);font-size:1rem;font-variant-numeric:tabular-nums}.order-label b{font-size:1.4rem;color:var(--ink);font-weight:650}.question-card{border:1px solid var(--line);border-top:3px solid var(--green);background:var(--paper);border-radius:16px;box-shadow:0 5px 28px #193f2f04;padding:30px 32px}.question-meta{display:flex;align-items:baseline;gap:11px;color:var(--muted);font-size:.875rem;margin-bottom:20px;flex-wrap:wrap}.type-tag{color:var(--green);background:var(--green-light);padding:3px 10px;border-radius:5px;font-size:.875rem;white-space:nowrap;font-weight:650}#question{font-size:1.35rem;font-weight:650;line-height:1.85;overflow-wrap:anywhere;outline:none}.instruction{color:var(--muted);font-size:.875rem;margin:14px 0 22px}fieldset{margin:0;padding:0;border:0;min-width:0}.options{display:grid;gap:12px}.option{position:relative;display:flex;align-items:flex-start;gap:12px;border:1px solid var(--line);border-radius:10px;padding:16px;cursor:pointer;background:#fff;min-height:61px}.option:hover{background:#f9fbfa;border-color:#90b4a3}.option:has(input:checked){border-color:var(--green);background:var(--green-light);box-shadow:0 0 0 1px var(--green)}.option input{appearance:none;-webkit-appearance:none;width:21px;height:21px;border:1.5px solid #91a299;margin:4px 0 0;flex-shrink:0;background:#fff;position:relative}.option input[type=radio]{border-radius:50%}.option input[type=checkbox]{border-radius:4px}.option input:checked{border-color:var(--green);background:var(--green)}.option input:checked:after{content:"";position:absolute;left:6px;top:2px;width:5px;height:10px;border:solid white;border-width:0 2px 2px 0;transform:rotate(45deg)}.option-letter{font-weight:650;color:var(--muted);min-width:15px;font-size:1.075rem;padding-top:1px}.option-text{font-size:1.125rem;line-height:1.7;flex:1;overflow-wrap:anywhere}.option-status{font-size:.75rem;font-weight:650;white-space:nowrap;align-self:center;color:var(--green)}fieldset:disabled .option{cursor:default}.option.correct,.option.correct:has(input:checked){border-color:#86b19d;background:#eff8f2;box-shadow:none}.option.incorrect,.option.incorrect:has(input:checked){border-color:#d89d92;background:#fff3f1;box-shadow:none}.incorrect .option-status{color:var(--red)}.incorrect input:checked{background:var(--red);border-color:var(--red)}.judge-options{grid-template-columns:1fr 1fr}.judge-options .option{min-height:78px;align-items:center}.judge-options input{margin:0}.submit-row{border-top:1px solid #edf1ef;margin-top:25px;padding-top:23px;display:flex;align-items:center;gap:20px}.submit-row .primary{min-width:180px}.submit-row>span{color:var(--muted);font-size:.875rem}.feedback{margin-top:24px;padding:20px 22px;border-radius:10px;background:#edf7f0;border:1px solid #d3e8da}.feedback.review{background:#fff7ef;border-color:#efddc8}.feedback h4{font-size:1.125rem;margin:0 0 8px;color:var(--green)}.feedback.review h4{color:#9a5724}.answer-line{font-size:1.075rem}.answer-line strong{font-size:1.2rem}.answer-line>span{display:inline-block;font-size:.9375rem;color:var(--muted);margin-left:20px}.source{border-top:1px solid #d4e2d9;margin-top:14px;padding-top:13px}.source b{font-size:.875rem;font-weight:650}.source p{font-size:1rem;line-height:1.65;margin-top:4px}.source-location{font-size:.8125rem;color:var(--muted);margin-top:12px}.source-note{font-size:.875rem;margin-top:12px;color:#8e542a}.navigation{display:flex;justify-content:space-between;gap:15px;margin-top:18px}.navigation .button{min-width:150px}.below-question{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:18px;font-size:.875rem;color:var(--muted)}.below-question>span{display:flex;align-items:center;gap:7px}.link-button{background:none;border:none;color:var(--muted);font-size:.875rem;text-decoration:underline;text-underline-offset:4px;padding:6px 0}.link-button:hover{color:var(--green)}
.summary-card{background:white;border:1px solid var(--line);border-top:3px solid var(--green);border-radius:16px;padding:44px 34px;text-align:center}.summary-icon{margin:0 auto 18px;background:var(--green-light);color:var(--green);display:grid;place-items:center;width:70px;height:70px;border-radius:50%}.summary-card .eyebrow{display:block}.summary-card h2{margin:14px 0 8px}.summary-card>p{color:var(--muted);font-size:1rem}.summary-stats{display:grid;grid-template-columns:repeat(3,1fr);margin:30px 0;padding:20px 0;border-block:1px solid var(--line)}.summary-stats>div{display:flex;flex-direction:column;gap:4px}.summary-stats>div+div{border-left:1px solid var(--line)}.summary-stats strong{font-size:2rem;color:var(--green);font-weight:650}.summary-stats span{font-size:.875rem;color:var(--muted)}.summary-buttons{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}.summary-card .muted{font-size:.875rem;margin-top:22px}footer{max-width:1280px;margin:34px auto 0;padding:25px 36px 30px;border-top:1px solid var(--line);font-size:.8125rem;color:var(--muted);line-height:1.9}.loading,.error-card{padding:40px;text-align:center}.error-card p{margin:15px 0}
@media(min-width:1050px){.practice-sidebar{position:sticky;top:24px}}
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@media(max-width:760px){.topbar{padding:20px 18px;align-items:flex-start;gap:12px}.brand{gap:10px}.brand-icon{width:40px;height:44px;font-size:1.4rem}.brand h1{font-size:1.3rem}.brand p{font-size:.75rem}.signature{font-size:.75rem;margin-top:1px;max-width:140px;padding-left:8px}.signature b{font-size:.75rem;letter-spacing:0}main{padding:0 16px}.workspace{display:flex;flex-direction:column;gap:18px}.practice-sidebar{width:100%;padding:0}.sidebar-heading{margin-bottom:10px}.types{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.type-button{padding:11px 10px;gap:0;justify-content:center;min-height:80px}.type-number,.type-check{display:none}.type-copy{align-items:center}.type-copy b{font-size:1.0625rem}.type-copy small{font-size:.8125rem}.practice-actions{display:flex;gap:10px;margin:12px 0}.practice-actions .button{font-size:.9375rem;min-height:44px;padding:9px 10px;flex:1;gap:6px}.round-stats{padding:10px 0 0;border-top:1px solid var(--line);display:flex;align-items:center;gap:15px;flex-wrap:wrap}.round-stats h2,.round-stats progress{display:none}.stats-grid{display:flex;margin:0;gap:18px}.stats-grid>div{flex-direction:row;align-items:baseline;gap:5px}.stats-grid strong{font-size:1.15rem}.stats-grid span{font-size:.8125rem}.round-stats>p{margin:0 0 0 auto;font-size:.8125rem}.save-note{font-size:.8125rem;margin-top:7px}.practice-main{width:100%}.section-top{margin-bottom:12px}.section-top .eyebrow{font-size:.8125rem}.section-top h2{font-size:1.4rem}.question-card{border-radius:12px;padding:21px 18px}.question-meta{font-size:.8125rem;margin-bottom:16px}#question{font-size:1.25rem;line-height:1.9}.instruction{font-size:.875rem;margin:12px 0 18px}.option{padding:14px 12px;gap:10px}.option-text{font-size:1.0625rem}.option-letter{font-size:1rem}.submit-row{flex-direction:column;align-items:stretch;gap:10px;padding-top:18px}.submit-row>span{text-align:center;font-size:.8125rem}.submit-row .button{min-height:53px}.navigation .button{min-width:0;flex:1;font-size:1rem}.below-question{flex-wrap:wrap;font-size:.8125rem}.link-button{font-size:.8125rem}.feedback{padding:17px}.answer-line>span{display:block;margin:5px 0 0}.summary-card{padding:30px 20px}.summary-card #question{font-size:1.35rem}.summary-buttons{flex-direction:column}.summary-stats strong{font-size:1.75rem}footer{padding:22px 18px;margin-top:25px;font-size:.75rem}.judge-options .option{gap:8px}}
@media(max-width:380px){.topbar{flex-wrap:wrap}.signature{max-width:none;border:0;padding:0;font-size:.75rem}.signature b{display:inline;margin-left:4px}.stats-grid{gap:12px}.practice-actions .button{font-size:.875rem}.question-card{padding-inline:14px}}
.favorites-sidebar{margin:0 0 24px;border-top:1px solid var(--line);padding-top:18px}.favorites-nav{display:flex;align-items:center;gap:12px;width:100%;padding:15px 16px;border:1px solid #cbdad2;border-radius:12px;background:white;color:var(--deep);text-align:left;min-height:55px}.favorites-nav b{font-size:1rem}.favorites-nav .count{margin-left:auto}.favorites-nav.active{background:var(--green-light);border-color:var(--green)}.favorites-nav svg{color:#91651a;flex-shrink:0}.favorite-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:8px 13px;border:1px solid #d8dfda;border-radius:9px;background:white;color:var(--muted);font-size:.9375rem;white-space:nowrap}.favorite-button.saved{background:#fff7df;color:#80580e;border-color:#d8bb78}.favorite-button.saved svg{fill:#e7c875}.favorite-button:hover{border-color:#a68133}.favorite-control{display:flex;justify-content:flex-end;margin:-4px 0 16px}.favorites-toolbar{margin-bottom:18px}.favorites-practice{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 20px}.favorites-list{display:grid;gap:15px}.favorite-card{padding:24px;background:white;border:1px solid var(--line);border-radius:13px}.favorite-card-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:14px}.favorite-card h3{font-size:1.1875rem;line-height:1.85;overflow-wrap:anywhere}.favorite-card details{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.favorite-card summary{cursor:pointer;color:var(--green);font-size:1rem;padding:5px 0;min-height:40px}.favorite-card summary:focus-visible{outline:3px solid #d39b2a;outline-offset:3px}.favorite-options{list-style:none;padding:0;display:grid;gap:10px;font-size:1.0625rem}.favorite-options li{overflow-wrap:anywhere}.favorite-options b{color:var(--green)}
@media(max-width:760px){.favorites-sidebar{margin-bottom:12px;padding-top:0;border:0}.favorites-nav{padding:11px 14px;min-height:48px}.favorite-card{padding:20px 17px}.favorites-practice .button{font-size:.9375rem;padding:10px 12px}.favorite-control{margin:0 0 14px}.favorite-card h3{font-size:1.125rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}