:root{font-synthesis:none;--stem:20px;--option:17px;--nav-height:64px}*{box-sizing:border-box}body{margin:0}body.large{--stem:24px;--option:21px}button,input,select{font:inherit}button{cursor:pointer;border:0;color:inherit;background:none;min-height:44px}button:disabled{cursor:default;opacity:.45}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #84a9ff;outline-offset:3px}input,select{min-height:44px;border:1px solid #cbd5e3;border-radius:8px;background:white;padding:9px 11px;min-width:0;max-width:100%}h1,h2,h3,p{margin:0}h1{font-size:27px;line-height:1.4}h2{font-size:21px}h3{font-size:17px}.shell{display:flex;min-height:100vh}#sidebar{position:sticky;top:0;height:100vh;width:238px;flex-shrink:0;padding:34px 22px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:16px}.brand-logo{display:grid;place-items:center;width:42px;height:45px;background:var(--blue);color:white;border-radius:13px;font-size:21px}.brand small{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:6px}.nav-caption{font-size:12px;color:var(--muted);margin:42px 13px 15px}.navigation{display:flex;flex-direction:column;gap:9px}.nav-btn{display:flex;align-items:center;gap:12px;text-align:left;padding:13px 15px;border-radius:10px;color:var(--muted);font-size:15px}.nav-btn.active{background:#edf3ff;color:var(--blue);font-weight:700}.nav-symbol{font-size:20px;width:24px;text-align:center}.nav-badge{font-size:12px;background:#e9edf5;border-radius:5px;padding:2px 5px;margin-left:auto}.side-note{margin-top:auto;font-size:14px;color:var(--muted);padding:24px 6px 0}.side-note strong{display:block;color:#17233d;font-size:25px;margin-bottom:5px}.side-note p{font-size:12px;margin-top:12px}.side-note small{display:block;font-size:12px;line-height:1.9;margin-top:25px}.progress{height:5px;background:#e9edf5;border-radius:4px;overflow:hidden;margin:13px 0}.progress i{display:block;height:100%;width:0;background:var(--blue)}.main{min-width:0;flex:1}.desktop-caption{color:var(--muted);font-size:13px}.mobile-brand{display:none}.icon-button{font-size:22px;min-width:44px;border:1px solid var(--line);border-radius:9px;line-height:1}#main{max-width:1260px;margin:0 auto;padding:28px 36px 40px}.heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:19px}.heading p{font-size:13px;line-height:1.8;color:var(--muted);margin-top:6px}.heading .mini-stat{text-align:right;white-space:nowrap}.mini-stat strong{font-size:23px}.mini-stat span{font-size:12px;color:var(--muted)}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:17px}.segmented{display:flex;padding:4px;gap:4px;background:#e9edf5;border-radius:10px}.segment{border-radius:7px;padding:8px 14px;font-size:14px;min-height:44px;color:var(--muted)}.segment.active{background:white;color:var(--blue);box-shadow:0 1px 4px #1024440d;font-weight:600}.filter-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:14px}.check-label{display:flex;align-items:center;gap:7px;min-height:44px;cursor:pointer;color:var(--muted)}input[type=checkbox]{accent-color:var(--blue);width:18px;height:18px;min-height:18px}.study-grid{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:22px;align-items:start}.question,.card,.surface{background:#fff;border:1px solid var(--line);border-radius:16px}.question{padding:26px 28px;min-width:0;scroll-margin-top:14px}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:13px;color:var(--muted)}.type-tag{display:inline-block;background:#edf3ff;color:var(--blue);padding:6px 9px;border-radius:6px;margin-right:8px;font-size:12px}.favorite{font-size:14px;padding:8px 0 8px 12px;color:var(--muted);white-space:nowrap}.favorite.on{color:#956515}.stem{font-size:var(--stem);font-weight:500;line-height:1.85;margin:20px 0 22px;overflow-wrap:anywhere}.options{display:grid;gap:12px}.option{display:flex;align-items:flex-start;text-align:left;gap:12px;width:100%;border:1px solid #dce3ee;border-radius:11px;padding:15px;background:#fff;min-height:60px;font-size:var(--option);line-height:1.65;transition:background-color .12s,border-color .12s}.option:disabled{opacity:1}.option:hover:not(:disabled){border-color:#9bb7f6}.option.selected{border-color:var(--blue);background:#eff5ff}.option.correct{border-color:#8ac5a7;background:#f0faf4}.option.wrong{border-color:#dfa3ae;background:#fff2f4}.option-key{display:grid;place-items:center;width:29px;height:29px;flex-shrink:0;border:1px solid #d5deeb;border-radius:7px;font-size:14px;line-height:1;background:white}.selected .option-key{background:var(--blue);border-color:var(--blue);color:white}.correct .option-key{background:var(--green);border-color:var(--green);color:white}.wrong .option-key{background:var(--red);border-color:var(--red);color:white}.option-copy{flex:1;min-width:0;overflow-wrap:anywhere}.option-mark{display:block;font-size:12px;line-height:1.8;color:var(--muted)}.feedback{margin-top:20px;padding:17px 19px;border-radius:11px;font-size:14px;line-height:1.9;scroll-margin-bottom:155px}.feedback.good{background:#eff9f3;border-left:3px solid var(--green)}.feedback.bad{background:#fff1f3;border-left:3px solid var(--red)}.feedback.neutral{background:#f1f5fc;border-left:3px solid var(--blue)}.feedback strong{font-size:16px}.feedback p{margin-top:5px}.correct-label{color:var(--green);font-weight:700}.wrong-label{color:var(--red);font-weight:700}.hint{font-size:12px;color:var(--muted);line-height:1.9;margin-top:15px}.question-tools{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.text-button{font-size:13px;color:var(--muted);padding:7px 10px;border-radius:8px;border:1px solid var(--line)}.actionbar{margin-top:23px;padding-top:19px;border-top:1px solid var(--line);display:flex;align-items:center;gap:9px}.primary,.secondary,.danger{border-radius:9px;padding:11px 17px;font-size:14px;font-weight:600;line-height:1.5}.primary{background:var(--blue);color:white}.secondary{background:#fff;border:1px solid #d9e1ed}.danger{color:var(--red);border:1px solid #e1b9c2;background:#fff}.actionbar .primary{margin-left:auto;min-width:138px}.card{padding:20px;min-width:0}.card summary{font-size:15px;font-weight:700;cursor:pointer;list-style:none;min-height:44px;display:flex;align-items:center;justify-content:space-between;gap:8px}.card-summary{font-size:12px;font-weight:400;color:var(--muted)}.legend{display:flex;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin:13px 0}.legend span:before{content:'';display:inline-block;width:8px;height:8px;margin-right:5px;background:#e9edf5;border:1px solid #ccd5e3;border-radius:2px}.legend .good:before{background:#bce6cd;border-color:#9ad0b1}.legend .bad:before{background:#f1c4cc;border-color:#db9aa7}.legend .done:before{background:#bacefc;border-color:#8eaff2}.numbers{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}.number{min-height:44px;border:1px solid var(--line);border-radius:7px;font-size:12px;padding:4px 0;font-variant-numeric:tabular-nums}.number.good{background:#eff9f3;border-color:#afd8c0;color:var(--green)}.number.bad{background:#fff1f3;border-color:#e3b4bf;color:var(--red)}.number.done{background:#edf3ff;border-color:#bdd1ff;color:var(--blue)}.number.current{outline:2px solid var(--blue);outline-offset:-2px;font-weight:700}.card-pages{display:flex;align-items:center;justify-content:space-between;gap:4px;font-size:12px;color:var(--muted);margin:10px 0}.card-pages button{padding:6px 9px}.jump-form{display:flex;gap:7px;margin-top:12px}.jump-form input{width:100%;font-size:13px}.jump-form button{flex-shrink:0}.surface{padding:27px;margin-bottom:18px}.surface p{font-size:14px;line-height:1.9;color:var(--muted);margin-top:12px}.empty{text-align:center;padding:45px 22px}.empty .primary{margin-top:20px}.list-head{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:17px}.question-list{display:grid;gap:10px}.list-item{width:100%;text-align:left;border:1px solid var(--line);border-radius:11px;padding:15px;background:#fff;line-height:1.8;font-size:15px;overflow-wrap:anywhere}.list-item small{display:block;font-size:12px;color:var(--muted);margin-bottom:7px}.list-page{display:flex;align-items:center;justify-content:center;gap:15px;margin-top:20px;font-size:13px;color:var(--muted)}.search-controls{display:grid;grid-template-columns:1fr 100px;gap:10px}.search-controls input{width:100%}.search-tools{display:flex;gap:9px;flex-wrap:wrap;margin-top:10px}.exam-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:27px 0}.exam-stats strong{display:block;font-size:30px;color:#17233d}.exam-stats small{font-size:14px;font-weight:400;color:var(--muted)}.exam-stats span{display:block;font-size:13px;color:var(--muted);margin-top:5px}.rules{width:100%;border-collapse:collapse;font-size:14px;margin:20px 0}.rules td,.rules th{padding:12px 6px;border-bottom:1px solid var(--line);text-align:left}.rules th{font-weight:400;color:var(--muted)}.timer{font-size:24px;color:var(--blue);font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}.score{font-size:49px;color:var(--blue);font-weight:750;white-space:nowrap}.score small{font-size:14px;color:var(--muted);font-weight:400}.result-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.result-buttons{display:flex;gap:10px;flex-wrap:wrap}.tools-grid{display:grid;gap:10px}.tool-link{display:flex;text-align:left;align-items:center;justify-content:space-between;border:1px solid var(--line);padding:16px;border-radius:10px;font-size:16px}.tool-link small{display:block;color:var(--muted);font-size:12px;line-height:1.7;margin-top:5px}.setting{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:19px 0;border-bottom:1px solid var(--line);font-size:15px}.setting small{display:block;color:var(--muted);line-height:1.8;margin-top:6px;font-size:12px}.setting input{flex-shrink:0}.backup-buttons{display:grid;gap:12px;margin:22px 0}.summary-box{background:#f3f6fb;padding:15px;border-radius:10px;margin:18px 0;font-size:14px;line-height:1.9}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:18px}dialog{border:1px solid var(--line);border-radius:18px;padding:25px;max-width:520px;width:calc(100% - 28px);color:#17233d;max-height:85dvh;overflow:auto}dialog::backdrop{background:#13223d66}#confirm{max-width:420px}#confirm-text{margin:17px 0 24px;font-size:14px;line-height:1.9;color:var(--muted)}.dialog-actions{display:flex;justify-content:flex-end;gap:10px}.dialog-message{font-size:14px;line-height:1.9;color:var(--muted)}#warning{padding:12px 18px;background:#fff2d1;color:#775219;font-size:14px;line-height:1.8}#warning button{text-decoration:underline;font-weight:700}#toast{display:none;position:fixed;z-index:10;bottom:24px;left:50%;transform:translateX(-50%);max-width:calc(100% - 24px);width:max-content;background:#17233d;color:#fff;padding:13px 20px;border-radius:10px;font-size:14px;line-height:1.6}#bottom-nav{display:none}.exam-active #sidebar,.exam-active #bottom-nav,.exam-active #menu-button{display:none}.exam-active #main{max-width:1120px}.exam-active .mobile-brand{display:block;font-size:14px}.exam-active .desktop-caption{display:none}.complete{padding:13px 16px;margin-top:18px;background:#edf3ff;border-radius:10px;font-size:14px;color:var(--blue)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(max-width:1100px){#sidebar{width:210px;padding:28px 16px}#main{padding:24px}.study-grid{gap:16px;grid-template-columns:minmax(0,1fr) 250px}.question{padding:23px}}
@media(max-width:959px){#sidebar{display:none}.shell{display:block}.mobile-brand{display:block;font-size:20px;font-weight:800;color:var(--blue)}.mobile-brand span{font-size:15px;color:#17233d;margin-left:6px}.desktop-caption{display:none}#main{padding:19px 16px calc(100px + env(safe-area-inset-bottom))}.heading{margin-bottom:15px}h1{font-size:23px}.heading p{font-size:12px}.study-grid{grid-template-columns:1fr;gap:16px}.question{padding:20px}.card{padding:15px 18px}.card:not([open]){padding-top:7px;padding-bottom:7px}.card summary:after{content:'展开 / 收起';font-size:12px;font-weight:400;color:var(--muted)}.card summary{flex-wrap:wrap}.numbers{grid-template-columns:repeat(8,minmax(0,1fr))}.card-pages{justify-content:center;gap:20px}#bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:fixed;bottom:0;left:0;right:0;z-index:4;height:calc(var(--nav-height) + env(safe-area-inset-bottom));padding:4px 9px calc(4px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line)}#bottom-nav .nav-btn{display:flex;flex-direction:column;justify-content:center;gap:2px;min-height:44px;padding:4px 0;position:relative;border-radius:8px;font-size:12px}#bottom-nav .nav-symbol{font-size:22px;line-height:25px}#bottom-nav .nav-badge{position:absolute;top:2px;left:calc(50% + 13px);font-size:10px;padding:1px 4px}#bottom-nav .nav-btn.active{background:#f0f5ff}.has-question #main{padding-bottom:calc(170px + env(safe-area-inset-bottom))}.actionbar{position:fixed;left:0;right:0;bottom:calc(var(--nav-height) + env(safe-area-inset-bottom));margin:0;padding:11px 15px;background:#fff;border-top:1px solid var(--line);z-index:4;box-shadow:0 -5px 18px #16223a05}.actionbar .primary{flex:1;min-width:0}.actionbar .secondary{padding-left:13px;padding-right:13px}.exam-active .actionbar{bottom:0;padding-bottom:calc(11px + env(safe-area-inset-bottom))}.exam-active.has-question #main{padding-bottom:calc(100px + env(safe-area-inset-bottom))}.exam-active .heading{position:sticky;top:0;background:#f4f6fa;z-index:2;padding:10px 0;margin-top:-10px}.exam-active .question{scroll-margin-top:80px}#toast{bottom:calc(145px + env(safe-area-inset-bottom))}.exam-active #toast{bottom:95px}.surface{padding:22px}.list-item{font-size:15px}.segment{padding:8px 13px}.toolbar{gap:9px}.question-meta{font-size:12px}.feedback{scroll-margin-bottom:170px}.exam-active .feedback{scroll-margin-bottom:100px}}
@media(max-width:430px){#main{padding-left:12px;padding-right:12px}.question{padding:17px}.stem{margin-top:16px;margin-bottom:20px}.option{padding:13px 12px;gap:11px}.numbers{grid-template-columns:repeat(6,minmax(0,1fr))}.filter-row{gap:7px}.filter-row select{font-size:13px;padding:8px}.check-label{font-size:13px}.segment{font-size:13px;padding:8px 11px}.mini-stat strong{font-size:20px}.heading p{max-width:225px}.surface{padding:20px 17px}.exam-stats{gap:8px}.exam-stats strong{font-size:26px}.result-heading h2{font-size:18px}.score{font-size:42px}dialog{padding:20px}.search-controls{grid-template-columns:1fr 86px}.search-tools input{width:106px}.question-tools{gap:6px}.text-button{padding:6px 8px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.practical-entry{text-decoration:none;min-height:44px}.navigation .practical-entry:focus-visible{outline:3px solid #84a9ff;outline-offset:3px}@media(max-width:959px){#bottom-nav{grid-template-columns:repeat(5,minmax(0,1fr))}}

.exam-active .practical-exam-entry{display:none!important}.practical-exam-entry{font-size:13px;white-space:nowrap}