:root{--slice-plum:#785568;--slice-mauve:#ede3eb;--slice-paper:#fff;--slice-ink:#17383f;--slice-teal:#177f76;--slice-line:#d4e3e6}
*{box-sizing:border-box}body{margin:0;background:#edf5f7;color:var(--slice-ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif}button,input,select,textarea{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}a{color:#176d88}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #3a9daf;outline-offset:3px}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.slice-header{display:flex;align-items:center;justify-content:space-between;padding:20px max(24px,calc((100vw - 1280px)/2));gap:20px;background:#f7fbfb;border-bottom:1px solid var(--slice-line)}.slice-header nav{display:flex;gap:22px;align-items:center;font-size:13px}.slice-header nav a{text-decoration:none}.slice-header nav button{border:0;background:none;color:#176d88;padding:8px 0}.slice-brand{font-weight:700;text-decoration:none}#slice-main{max-width:1280px;padding:36px 30px 70px;margin:auto;min-height:75vh}.eyebrow{font:11px/1.6 Consolas,"Microsoft YaHei",monospace;letter-spacing:.12em;color:#557780;margin:0 0 15px}h1,h2,h3,p{overflow-wrap:anywhere}h1{font-size:clamp(28px,4vw,43px);letter-spacing:.025em;line-height:1.45;margin:0 0 20px;font-weight:650}h2{font-size:23px;line-height:1.5;margin:12px 0}h3{font-size:15px;margin:0 0 12px}p{line-height:1.8}.slice-intro{display:flex;align-items:center;justify-content:space-between;padding:8px 35px 26px 0;gap:40px}.intro-copy{font-size:15px;color:#52717a;margin:0}.intro-figure{display:flex;align-items:center;flex-direction:column;flex-shrink:0}.intro-figure img{object-fit:contain;width:200px;height:215px}.intro-figure span{font-size:11px;color:#6b8390;padding:7px 12px;border-top:1px solid var(--slice-line)}.setup-grid{display:grid;grid-template-columns:290px minmax(0,1fr);gap:36px;border-top:1px solid var(--slice-line);padding-top:30px}.chapter-list{display:grid;gap:10px}.chapter-button{position:relative;display:block;text-align:left;width:100%;border:1px solid var(--slice-line);border-radius:5px;background:#f7fbfb;color:var(--slice-ink);padding:20px 17px}.chapter-button.active{border-color:var(--slice-teal);background:#fff;border-left:4px solid var(--slice-teal)}.chapter-button b{display:block;line-height:1.65;font-size:16px}.chapter-button small{display:block;font-size:12px;margin-top:10px;color:#607b85}.chapter-detail{background:#fff;padding:28px 34px;border:1px solid var(--slice-line);border-radius:6px}.chapter-heading{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#627b85}.chapter-tag{color:var(--slice-plum);background:var(--slice-mauve);padding:4px 9px;border-radius:3px}#chapter-description{font-size:14px;color:#607b85}.count-form{border-top:1px solid #e3ecee;padding-top:20px;margin-top:22px}.count-form>label{display:block;font-size:14px;margin-bottom:12px;font-weight:600}.count-input{display:inline-flex;border:1px solid #afc9d0;border-radius:4px;align-items:center;padding-right:18px;background:#f7fbfb}.count-input input{font-family:Consolas,monospace;font-size:28px;width:130px;max-width:50vw;border:0;background:none;color:var(--slice-ink);padding:12px 15px}.count-input span{font-size:13px;color:#627b85}.count-presets{display:inline-flex;flex-wrap:wrap;gap:8px;padding:12px}.count-presets button{background:#f7fbfb;color:#43616b;border:1px solid var(--slice-line);border-radius:3px;padding:8px 13px}.count-presets button:hover{border-color:var(--slice-teal)}#count-help{font-size:12px;color:#627b85;margin:8px 0 19px}.primary{display:inline-flex;align-items:center;justify-content:center;gap:30px;border:0;background:var(--slice-teal);border-radius:4px;color:white;font-size:14px;font-weight:600;padding:14px 22px;min-height:46px}.primary:hover:not(:disabled){background:#11695f}.quiet{border:1px solid #afc9d0;border-radius:4px;background:#fff;color:#476870;padding:11px 16px}.chapter-types{margin-top:25px;border-top:1px solid var(--slice-line);padding-top:20px}summary{cursor:pointer;font-size:13px}summary span{color:#627b85;margin-left:12px}.category-list{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.category-list span{display:inline-flex;align-items:center;gap:10px;font-size:12px;padding:6px 9px;background:#f3f7f8;border-radius:3px}.category-list small{color:#7a939b;font-family:Consolas,monospace}.resume-box{background:#e0f0ed;border-left:3px solid var(--slice-teal);display:flex;justify-content:space-between;align-items:center;padding:12px 18px;margin:10px 0 24px;gap:20px}.resume-box p{margin:0;font-size:13px}.resume-box button{border:0;background:none;color:#11695f;white-space:nowrap}.page-status{padding:36px 0;color:#627b85}.page-error,.form-error,.image-error{color:#993b45;font-size:13px;line-height:1.7}.page-error{padding:20px;border:1px solid #dfbfc5;background:#fff5f6;margin:0 0 20px}.page-error button,.image-error button{margin-left:15px;background:none;border:0;text-decoration:underline;color:inherit}.practice-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.practice-heading h1{font-size:28px;margin:0 0 26px}.practice-heading .eyebrow{margin:0 0 8px}.progress-meta{display:flex;justify-content:space-between;font:12px/1.5 Consolas,"Microsoft YaHei",monospace;color:#627b85}progress{display:block;width:100%;height:5px;margin:12px 0 26px;accent-color:var(--slice-teal);border:0;background:#d4e3e6}progress::-webkit-progress-bar{background:#d4e3e6}progress::-webkit-progress-value{background:var(--slice-teal)}.practice-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(350px,.9fr);gap:25px;align-items:start}.specimen-panel{background:#fff;border:1px solid #d6c7d1;border-top:3px solid var(--slice-plum);border-radius:5px;padding:20px}.specimen-topline{display:flex;justify-content:space-between;font-size:12px;margin-bottom:16px;color:var(--slice-plum)}.specimen-topline span{color:#8d7b86}.specimen-image{display:flex;width:100%;align-items:center;justify-content:center;min-height:350px;height:390px;border:0;background:#f3eef2;cursor:zoom-in;padding:12px;border-radius:3px}.specimen-image img{max-height:100%;max-width:100%;object-fit:contain;image-rendering:auto}.specimen-panel>p{font-size:14px;margin:17px 0 10px}.specimen-foot{font:10px/1.8 Consolas,"Microsoft YaHei",monospace;color:#8d7b86}.answer-panel{background:#fff;border:1px solid var(--slice-line);border-radius:5px;padding:22px}.answer-heading .eyebrow{font-size:10px;margin:0;color:#7c97a0}.answer-heading h2{font-size:19px;margin:5px 0}.answer-heading p{font-size:12px;color:#718b94;margin:5px 0 18px}#answer-options{display:grid;grid-template-columns:1fr 1fr;gap:7px;border:0;margin:0 0 17px;padding:0}.answer-option{display:flex;gap:8px;align-items:center;border:1px solid #dbe5e8;border-radius:4px;padding:9px 10px;font-size:12px;line-height:1.65;cursor:pointer;min-height:42px;background:#fbfdfd}.answer-option input{accent-color:var(--slice-teal);flex-shrink:0;margin:0}.answer-option:has(input:checked){border-color:var(--slice-teal);background:#e9f5f1}.answer-option.is-correct{border-color:#177f76;background:#e7f4ec}.answer-option.is-wrong{border-color:#b95151;background:#fceff0}.answer-option:has(input:disabled){cursor:default}#confirm-answer{width:100%}.feedback{background:#fff;border:1px solid #aacbc3;border-left:5px solid var(--slice-teal);padding:26px 30px;margin-top:28px;border-radius:4px;scroll-margin:20px}.feedback.wrong{border-color:#d6b3ba;border-left-color:#a34e5e}.feedback-heading{display:flex;align-items:center;gap:15px}.feedback-heading>span{font-size:26px;color:var(--slice-teal)}.feedback.wrong .feedback-heading>span{color:#a34e5e}.feedback-heading .eyebrow{margin:0}.feedback-heading h2{margin:0;font-size:23px}#your-answer{font-size:13px;color:#657e87}.feedback-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin:24px 0}.feedback-grid p,.feedback-grid li{font-size:13px;line-height:1.9}.feedback-grid ul{padding-left:20px;margin:0}.feedback-source{display:flex;flex-wrap:wrap;gap:16px;align-items:center;border-top:1px solid var(--slice-line);padding:16px 0;font-size:11px;color:#7a9097}.feedback-source>span{flex:1;min-width:200px}.feedback-source button{border:0;background:none;color:#176d88;font-size:12px;padding:0}.feedback-source a{font-size:12px}#next-question{min-width:150px}.result-stats{display:flex;gap:70px;margin:40px 0}.result-stats strong{font:42px/1.3 Consolas,monospace;display:block;color:var(--slice-teal)}.result-stats span{font-size:12px;color:#627b85}.result-actions{display:flex;gap:15px;margin-bottom:40px}.review-list{display:grid;gap:12px}.review-item{background:#fff;border:1px solid var(--slice-line);border-radius:4px;padding:16px}.review-item summary{display:flex;align-items:center;gap:20px;list-style:none}.review-item summary img{width:65px;height:65px;object-fit:contain;background:#f3eef2}.review-item summary span{flex:1;line-height:1.9}.review-item summary small{display:block;color:#7c9098}.review-status{font-size:12px;color:var(--slice-teal)}.review-status.wrong{color:#a34e5e}.review-detail{padding:20px 0 5px;font-size:13px;border-top:1px solid #e2ebee;margin-top:16px}.review-detail p{margin:0 0 10px}.review-detail button{border:0;background:#f1f7f7;color:#176d88;border-radius:3px;padding:9px 13px}.review-full{display:block;max-width:100%;max-height:340px;object-fit:contain;margin:0 auto 20px}.review-more{font-size:12px;color:#176d88}
dialog{max-width:calc(100vw - 28px);border:1px solid var(--slice-line);border-radius:8px;padding:24px;color:var(--slice-ink);box-shadow:0 20px 70px #17383f33}dialog::backdrop{background:#17383fa6}#image-viewer{width:1000px}.dialog-topline{display:flex;justify-content:space-between;align-items:center}.dialog-topline h2{font-size:16px;margin:0}.dialog-topline button,.guide-close{border:0;background:#edf5f7;border-radius:4px;color:#17383f;width:36px;height:36px;font-size:24px}.viewer-body{overflow:auto;max-height:75vh;margin-top:20px;text-align:center;background:#f4eef2}.viewer-body img{max-width:100%;object-fit:contain}#image-viewer>p{font-size:11px;color:#718b94;margin-bottom:0}#slice-guide[open]{display:grid;grid-template-columns:180px 1fr;align-items:center;gap:25px;width:760px;padding:35px}#slice-guide>img{object-fit:contain;max-width:100%}.guide-close{position:absolute;top:12px;right:12px}#slice-guide h2{font-size:26px}#slice-guide ol{padding-left:20px;margin:20px 0}#slice-guide li{padding-left:4px;margin-bottom:15px;font-size:13px}#slice-guide li p{margin:3px 0;color:#607b85;font-size:12px}
@media(min-width:1500px){.specimen-image{height:450px}}@media(max-width:850px){.slice-header{padding:16px 20px}.slice-header nav{gap:14px;font-size:12px}#slice-main{padding:25px 20px 45px}.setup-grid{grid-template-columns:220px 1fr;gap:20px}.chapter-detail{padding:22px}.count-presets{padding-left:0}.practice-grid{grid-template-columns:1fr 1fr;gap:15px}.specimen-image{height:340px;min-height:280px}.specimen-panel,.answer-panel{padding:16px}#answer-options{grid-template-columns:1fr}.answer-option{font-size:12px;padding:7px 9px;min-height:36px}.intro-figure img{width:165px;height:190px}.feedback-grid{gap:20px}}@media(max-width:600px){.slice-header{align-items:flex-start;gap:12px;flex-direction:column}.slice-header nav{width:100%;justify-content:space-between}.slice-intro{padding:5px 0 26px;gap:10px;align-items:flex-start}.slice-intro h1{font-size:27px}.intro-copy{font-size:12px}.intro-figure img{width:100px;height:145px}.intro-figure span{font-size:9px;padding:5px 0}.eyebrow{font-size:9px}.setup-grid{grid-template-columns:1fr;gap:20px;padding-top:22px}.chapter-button{padding:13px 15px}.chapter-button b{font-size:15px}.chapter-button small{margin-top:5px}.chapter-detail{padding:20px}h2{font-size:20px}.count-presets{display:flex;padding:12px 0}.practice-heading{align-items:flex-start}.practice-heading h1{font-size:23px}.practice-heading .quiet{padding:8px 10px;font-size:11px;max-width:110px}.practice-grid{grid-template-columns:1fr}.specimen-image{height:320px}.answer-panel{padding:18px}#answer-options{grid-template-columns:1fr 1fr}.answer-option{font-size:11px}.feedback{padding:20px}.feedback-grid{grid-template-columns:1fr;gap:20px}.feedback-heading h2{font-size:21px}.feedback-source>span{min-width:100%}.result-stats{gap:35px}.result-stats strong{font-size:34px}.result-actions{flex-direction:column;align-items:stretch}.resume-box{align-items:flex-start;flex-direction:column;gap:8px}.review-item summary{gap:12px}.review-item summary img{width:45px;height:50px}#slice-guide[open]{grid-template-columns:1fr;padding:28px 24px;max-height:90vh;overflow:auto;gap:0}#slice-guide>img{width:95px;height:110px;margin:0 auto}#slice-guide h2{font-size:23px}#slice-guide .eyebrow{margin-bottom:5px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* Isolate answer controls from the shared input { width:100%; min-height:44px } rule. */
#answer-options{grid-template-columns:repeat(2,minmax(0,1fr));min-width:0}
#answer-options .answer-option{display:grid;grid-template-columns:18px minmax(0,1fr);gap:10px;align-items:center;min-width:0;min-height:46px;padding:10px 12px;text-align:left}
#answer-options .answer-option input[type="radio"]{appearance:auto;width:18px;min-width:18px;max-width:18px;height:18px;min-height:18px;flex:none;padding:0;margin:0;box-shadow:none;accent-color:var(--slice-teal)}
#answer-options .answer-option span{min-width:0;white-space:normal;word-break:normal;overflow-wrap:break-word;writing-mode:horizontal-tb;line-height:1.65}
.answer-mode-switch{display:flex;gap:4px;padding:4px;background:#edf5f7;border-radius:5px;margin:18px 0 24px}
.answer-mode-switch button{flex:1;min-height:40px;border:1px solid transparent;border-radius:3px;background:none;color:#607b85;font-size:13px}
.answer-mode-switch button[aria-pressed="true"]{background:#fff;border-color:#c6dcdb;color:#11695f;font-weight:600}
.text-answer-area{padding:12px 0 22px}.text-answer-area>label{display:block;font-size:13px;font-weight:600;margin-bottom:12px}
#typed-answer{display:block;width:100%;height:50px;min-height:50px;padding:12px 14px;border:1px solid #afc9d0;border-radius:4px;font-size:16px;color:#17383f;background:#fff}
.text-answer-area>p{font-size:12px;line-height:1.7;margin:12px 0 0;color:#718b94}
.practice-history{margin-top:40px;padding-top:26px;border-top:1px solid var(--slice-line)}.history-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.history-heading h2{font-size:20px;margin:4px 0}.history-heading .eyebrow{margin-bottom:4px}
.history-list{display:grid;gap:10px}.history-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(155px,.45fr) auto;gap:22px;align-items:center;background:#fff;border:1px solid var(--slice-line);border-radius:5px;padding:18px 22px}.history-copy b{font-size:14px;display:block;line-height:1.7}.history-row small{display:block;color:#718b94;font-size:11px;line-height:1.8;margin-top:5px}.history-status>span{font-size:12px;color:#856646}.history-status .history-complete{color:#177f76}.history-row button{font-size:12px;white-space:nowrap}.history-pagination{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:20px;font-size:12px;color:#718b94}.history-empty{font-size:13px;color:#718b94;padding:20px 0}
@media(max-width:600px){.answer-mode-switch{margin:15px 0 18px}.history-row{grid-template-columns:minmax(0,1fr) auto;gap:12px;padding:16px}.history-status{grid-column:1;grid-row:2}.history-row>button{grid-column:2;grid-row:1/3}.history-heading h2{font-size:18px}.history-heading>.quiet{font-size:11px;padding:8px 10px}.history-pagination{gap:8px}.history-pagination button{font-size:11px;padding:8px 10px}}
@media(max-width:420px){#answer-options{grid-template-columns:1fr}#answer-options .answer-option{font-size:13px;min-height:44px}}