:root{font-family:Inter,"Microsoft YaHei","PingFang SC",sans-serif;color:#24334b;background:#f4f6fa;font-synthesis:none;--blue:#315ee7;--line:#e4e9f1;--muted:#7b879a}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0}button,input,select{font:inherit}button,select,summary{cursor:pointer}button{min-height:44px;border:0;border-radius:9px;padding:10px 17px;font-weight:600;touch-action:manipulation}button:disabled{opacity:.45;cursor:default}button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #80a5ff;outline-offset:3px}button:hover:not(:disabled){filter:brightness(.97)}.primary{background:var(--blue);color:#fff}.secondary{background:#edf1f7;color:#53627b}.text-button{background:none;color:var(--blue);padding:6px 4px;font-size:13px;font-weight:500}header{height:88px;max-width:1160px;margin:auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center}.mark{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:#182c50;color:white;font-size:18px;font-weight:800}.brand b{font-size:19px;letter-spacing:.3px}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:4px}.edition{font-size:12px;color:#62718b;background:#e9edf5;border-radius:20px;padding:7px 12px}.user-panel{max-width:1160px;margin:18px auto 0;padding:0 28px}.user-controls{display:flex;gap:12px;align-items:center}.user-controls>label{font-size:12px;color:var(--muted);white-space:nowrap}.user-controls>select{width:160px;padding:8px 30px 8px 12px;min-height:38px;font-size:13px}.user-create{margin-left:auto;position:relative;font-size:13px}.user-create>summary{padding:10px;color:#50627e;list-style:none}.user-create>summary::-webkit-details-marker{display:none}.user-create form{position:absolute;right:0;top:44px;z-index:10;width:300px;display:flex;gap:8px;background:white;padding:16px;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 36px #1d335a20}.user-create input{min-width:0;flex:1;margin:0;font-size:13px}.user-create button{white-space:nowrap;font-size:12px;padding:8px 10px}#user-note{font-size:11px;color:var(--muted);line-height:1.7;margin:7px 0 0}.study-tabs{display:flex;gap:24px;max-width:1104px;margin:18px auto 0;border-bottom:1px solid var(--line);padding:0}.study-tabs button{border-radius:0;min-height:50px;background:none;padding:12px 4px;font-size:15px;color:#7a879b;position:relative}.study-tabs .primary{color:var(--blue)}.study-tabs .primary:after{content:"";height:3px;background:var(--blue);position:absolute;left:0;right:0;bottom:-1px;border-radius:3px}main{display:grid;grid-template-columns:230px minmax(0,1fr);gap:32px;max-width:1160px;margin:auto;padding:28px 28px 60px}aside{align-self:start;background:#edf1f8;border:1px solid #e3e9f3;border-radius:16px;padding:23px 20px}.eyebrow{font-size:10px;letter-spacing:1.6px;color:#8190a8;font-weight:600}h1{font-size:22px;line-height:1.5;margin:12px 0}.intro{font-size:13px;color:#7b889e;line-height:1.8;margin:0}.stats{display:flex;gap:30px;margin:24px 0 14px;padding:20px 0;border-top:1px solid #dce3ef;border-bottom:1px solid #dce3ef}.stats strong{display:block;font-size:28px;color:#273f66;font-variant-numeric:tabular-nums}.stats span{display:block;font-size:11px;color:#78859b;margin-top:6px}.local-note,.source{font-size:11px;line-height:1.9;color:#8490a4}.source{margin-top:28px}.source b{font-size:12px;color:#62738c}.source p{margin:6px 0}.workspace{min-width:0}.topline{display:flex;justify-content:space-between;align-items:center}.topline h2{font-size:22px;margin:0;letter-spacing:.4px}.topline span{font-size:12px;color:var(--muted)}.filters{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0 0}.filters label{display:flex;align-items:center;gap:10px;font-size:12px;color:#70809a;white-space:nowrap}select{min-width:0;width:100%;border:1px solid #dce3ee;border-radius:8px;background:white;color:#34445f;padding:11px 12px;min-height:42px}.reset-tools{display:flex;justify-content:flex-end;margin:3px 0 2px}.reset-tools .text-button{color:#9a7480;font-size:11px;min-height:30px}.progress-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#71829c}.progress-meta .text-button{min-height:32px}progress{display:block;width:100%;height:4px;border:0;margin:4px 0 18px;background:#e2e8f4;border-radius:4px}progress::-webkit-progress-bar{background:#e2e8f4;border-radius:4px}progress::-webkit-progress-value{background:var(--blue);border-radius:4px}#question-card,.exam-card{background:white;border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:0 4px 20px #263d6510}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:11px;color:#92a0b4}#badge{padding:5px 9px;background:#edf2ff;border-radius:5px;color:var(--blue);font-size:12px;font-weight:600}h3{font-size:20px;font-weight:600;line-height:1.8;overflow-wrap:anywhere;margin:20px 0 10px}.hint{font-size:12px;color:#8a97aa;margin:0 0 20px;line-height:1.7}#options,.exam-choices{display:grid;gap:10px}.option{display:flex;align-items:center;gap:12px;width:100%;text-align:left;line-height:1.75;font-weight:400;font-size:14px;padding:13px 15px;border:1px solid #e1e7f0;background:#fff;color:#45546c}.option .key{display:grid;place-items:center;flex:0 0 28px;height:28px;border-radius:7px;background:#f3f5fa;font-size:12px;font-weight:600;color:#7385a0}.option.selected{background:#f0f4ff;border-color:#6385ec;color:#254dc1}.option.selected .key{background:var(--blue);color:white}.option.correct{background:#edf8f3;border-color:#66b794;color:#22694b}.option.wrong{background:#fff2f1;border-color:#e5a09a;color:#a3433b}.option:disabled{opacity:1}.actions{display:flex;gap:10px;margin-top:24px}.actions .primary{flex:1}.actions .secondary{min-width:84px}.save-note{font-size:11px;line-height:1.8;color:#8b99ad;text-align:center;margin:16px 0}.mistakes{margin-top:16px;border:1px solid var(--line);background:white;padding:16px 20px;border-radius:12px}.mistakes summary{font-size:13px;font-weight:600;color:#576984}.mistakes-help,#mistakes-empty{font-size:12px;color:var(--muted);line-height:1.8}#mistakes-list{display:grid;gap:8px;max-height:400px;overflow:auto}.mistake-item{display:grid;gap:7px;text-align:left;background:#f5f7fb;color:#53627b;overflow-wrap:anywhere;min-width:0}.mistake-item strong{font-size:12px;color:#aa625d}.mistake-item span{font-size:13px;font-weight:400;line-height:1.7}.mistake-item small{font-size:11px;font-weight:400;color:#8b98aa}#feedback,.exam-explanation{background:#f4f7fc;border-radius:10px;padding:18px;margin-top:20px;font-size:14px;line-height:1.9}#feedback h4{font-size:15px;margin:0 0 8px}#feedback p{margin:8px 0;overflow-wrap:anywhere}#feedback .ref{font-size:11px;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:16px;max-width:calc(100vw - 32px);width:400px;padding:28px;box-shadow:0 20px 80px #142e5330}dialog::backdrop{background:#14233d66}dialog h2{margin-top:0;font-size:20px}dialog label{font-size:13px}input{width:100%;padding:11px;border:1px solid #dce3ee;border-radius:8px;margin-top:12px}#jump-error{color:#a3433b;font-size:12px}.exam-main{max-width:1160px;margin:28px auto;padding:0 28px 60px}.exam-main>h2{font-size:22px;margin:0}.exam-main>p{font-size:13px;color:#8390a4;line-height:1.8}.exam-projects{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:24px}.exam-project{background:white;border:1px solid var(--line);border-radius:16px;padding:24px;border-top:3px solid #6383e3}.exam-project:nth-child(2){border-top-color:#53a58c}.exam-project:nth-child(3){border-top-color:#b48ace}.exam-project h3{margin:0;font-size:20px}.exam-project p{font-size:14px;color:#8390a4;margin:10px 0 22px}.exam-project button{width:100%;margin-top:8px}.exam-project>.secondary{background:none;color:#8d99ac;font-size:12px}.exam-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px}.exam-clock{color:#bc6a44;font-size:16px;font-variant-numeric:tabular-nums}.exam-result{background:#eaf2ff;color:#34588f;padding:16px;border-radius:12px;font-weight:600}.exam-card>p,#exam-paper>p{font-size:13px;color:#7d8ca1;line-height:1.8}.exam-card h3{margin-top:12px}.exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:8px;margin-top:16px}.exam-grid button{padding:8px;font-size:12px}.exam-grid [aria-current]{outline:2px solid #dea550}#exam-paper details{margin-top:20px}#exam-paper summary{font-size:13px;color:#657791;padding:12px 0}
@media(max-width:1160px){.study-tabs{margin-left:28px;margin-right:28px}}
@media(max-width:850px){main{grid-template-columns:1fr;gap:18px;max-width:780px}aside{display:none}.exam-projects{gap:12px}.exam-project{padding:18px}.brand small{display:none}}
@media(max-width:540px){header{height:70px;padding:0 18px}.brand b{font-size:17px}.mark{width:36px;height:36px;font-size:16px}.edition{font-size:10px;padding:6px 8px}.user-panel{padding:0 18px;margin-top:12px}.user-controls{gap:8px}.user-controls>select{width:140px}.user-create form{width:min(300px,calc(100vw - 36px))}#user-note{font-size:10px}.study-tabs{margin:10px 18px 0;gap:28px}.study-tabs button{font-size:14px;min-height:46px}main{padding:22px 16px 36px}.topline h2{font-size:20px}.filters{gap:12px;margin-top:16px}.filters label{display:block;font-size:11px}.filters select{margin-top:6px;font-size:12px;padding:10px 8px}.reset-tools{margin-top:5px}#question-card,.exam-card{padding:20px 17px;border-radius:13px}h3{font-size:18px;line-height:1.8;margin-top:18px}.option{padding:12px;gap:10px;font-size:14px}.actions{gap:8px}.actions button{padding:10px;font-size:13px}.actions .secondary{min-width:68px}.exam-main{padding:0 16px 40px;margin-top:22px}.exam-projects{grid-template-columns:1fr;gap:12px;margin-top:18px}.exam-project{display:grid;grid-template-columns:1fr auto;gap:4px 16px;padding:17px 18px;border-top:1px solid var(--line);border-left:3px solid #6383e3}.exam-project:nth-child(2){border-top-color:var(--line);border-left-color:#53a58c}.exam-project:nth-child(3){border-top-color:var(--line);border-left-color:#b48ace}.exam-project h3{font-size:17px;grid-column:1;grid-row:1}.exam-project p{font-size:12px;margin:2px 0 0;grid-column:1;grid-row:2}.exam-project .primary{grid-column:2;grid-row:1/3;align-self:center;width:auto;font-size:12px;margin:0}.exam-project>.secondary{grid-column:1/-1;margin:0;min-height:32px;padding:5px}.exam-clock{font-size:14px}.exam-toolbar h3{font-size:18px}.mistakes{padding:15px 17px}.question-meta{font-size:10px}}
.exam-grid .exam-grid-correct{background:#dff3e9;color:#217052;border:1px solid #75bd9c}.exam-grid .exam-grid-wrong{background:#fde8e6;color:#b0443d;border:1px solid #e59a94}.exam-grid-legend{margin:0 0 10px!important;font-size:11px!important;color:#7b879a!important}.exam-grid [aria-current].exam-grid-wrong{outline-color:#c8463d}.exam-grid [aria-current].exam-grid-correct{outline-color:#318462}
@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}}
@media(max-width:540px){.filters select{display:block}.filters label{white-space:normal;min-width:0}}
#practical-main{max-width:1000px}#practical-main>label{font-size:12px;color:#71829c;display:block;margin-top:24px}#practical-select{margin:8px 0 18px;width:100%;text-overflow:ellipsis}#practical-main>.progress-meta{margin-bottom:14px;gap:12px}.practical-meta{font-size:12px;color:#7b879a;line-height:1.8}.practical-question{font-size:14px;line-height:1.95;overflow-wrap:anywhere}.practical-question p{white-space:pre-wrap;margin:12px 0}.practical-original{margin:16px 0;font-size:12px;color:#657791}.practical-original summary{padding:10px 0}.practical-original img{display:block;width:100%;height:auto;margin:12px 0;border:1px solid #e4e9f1}.rubric-wrap{overflow:auto}.rubric{border-collapse:collapse;width:100%;font-size:13px;line-height:1.8}.rubric th,.rubric td{padding:12px;border:1px solid #e4e9f1;text-align:left;vertical-align:top}.rubric th{background:#f0f4fa;color:#53627b}.rubric td:nth-child(-n+2){white-space:nowrap}.rubric td:last-child{min-width:180px;overflow-wrap:anywhere}.practical-answer{margin-top:24px;padding:18px;border-radius:12px;border:1px solid #cedcf8;background:#f6f9ff}.practical-answer>summary{font-weight:600;color:#315ee7;cursor:pointer;font-size:15px}.practical-answer-text{white-space:pre-wrap;overflow-wrap:anywhere;font-family:Consolas,"Microsoft YaHei",monospace;font-size:13px;line-height:1.85;tab-size:4}.practical-answer h4{font-size:13px;color:#62718b;border-top:1px solid #e4e9f1;padding-top:16px}@media(max-width:540px){.rubric th,.rubric td{padding:8px;font-size:12px}.practical-answer{padding:12px}.practical-question{font-size:14px}.practical-answer-text{font-size:12px}.study-tabs{gap:22px}}
.answer-line,.answer-completion{min-height:1.85em;padding:1px 8px;border-radius:6px}.answer-code-fill{margin:3px 0;padding:7px 9px;background:#fff4cf;border-left:4px solid #e1a52c;color:#44351a;font-weight:600}.answer-text-fill{padding:5px 8px 3px;color:#44351a;font-weight:600;text-decoration-line:underline;text-decoration-color:#dda52c;text-decoration-thickness:3px;text-underline-offset:5px}
.pdf-fill-mark{background:#fff0ad;color:#3b3015;font-weight:700;text-decoration-line:underline;text-decoration-color:#d59112;text-decoration-thickness:3px;text-underline-offset:4px;border-radius:3px;padding:1px 2px}.mistake-redo{width:100%;margin:4px 0 12px;color:#315ee7;background:#edf2ff}
.answer-tables{margin:10px 0 18px;overflow-x:auto}.answer-table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:1px solid #dce4f0;border-radius:10px;overflow:hidden;font-size:12px;line-height:1.65}.answer-table th,.answer-table td{padding:10px 12px;text-align:left;vertical-align:top;border-right:1px solid #e5eaf2;border-bottom:1px solid #e5eaf2;white-space:pre-wrap;overflow-wrap:anywhere}.answer-table th:last-child,.answer-table td:last-child{border-right:0}.answer-table tbody tr:last-child td{border-bottom:0}.answer-table th{background:#eaf0fb;color:#425675;font-weight:700;white-space:nowrap}.answer-table th:nth-child(1){width:13%}.answer-table th:nth-child(2){width:18%}.answer-table th:nth-child(3){width:40%}.answer-table-code{font-family:Consolas,"Microsoft YaHei",monospace;color:#263d66;background:#fbfcff}
@media(max-width:640px){.answer-tables{overflow:visible}.answer-table,.answer-table tbody,.answer-table tr,.answer-table td{display:block;width:100%}.answer-table{border:0;background:transparent}.answer-table thead{display:none}.answer-table tr{margin:0 0 12px;border:1px solid #dce4f0;border-radius:10px;overflow:hidden;background:#fff}.answer-table td{display:grid;grid-template-columns:76px minmax(0,1fr);gap:8px;border:0;border-bottom:1px solid #e8edf4;padding:9px 10px}.answer-table td:last-child{border-bottom:0}.answer-table td::before{content:attr(data-label);font-family:Inter,"Microsoft YaHei",sans-serif;font-weight:700;color:#6b7b92}.answer-table-code{background:#f8faff}}

#question-card .actions{justify-content:center;gap:24px}#question-card .actions>button{flex:0 0 104px;min-width:0;min-height:38px;background:var(--blue);color:#fff;padding:8px 14px;font-size:13px}
#practice-main{overflow-anchor:none}
.summary-directory{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0}.summary-directory a{padding:9px 13px;border-radius:8px;background:#eaf0ff;color:#315ee7;text-decoration:none;font-size:13px}.summary-body{background:white;border:1px solid var(--line);border-radius:16px;padding:24px;font-size:14px;line-height:1.9}.summary-body h2{font-size:20px;margin:32px 0 16px;scroll-margin-top:20px}.summary-body h3{font-size:16px;color:#315ee7;margin-top:28px}.summary-body p{margin:12px 0}.summary-body pre{background:#f3f6fb;padding:14px;border-radius:9px;overflow:auto;line-height:1.7}.summary-body code{font-family:Consolas,monospace;font-size:13px}.summary-body img{width:100%;height:auto;border-radius:8px}.summary-table-wrap{overflow:auto}.summary-body table{border-collapse:collapse;min-width:680px;width:100%}.summary-body th,.summary-body td{border:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}.summary-body th{background:#edf2ff}@media(max-width:540px){.summary-body{padding:16px}.study-tabs{gap:16px}.summary-directory a{font-size:12px}}
.summary-fill{border:1px solid var(--line);border-radius:10px;margin:12px 0;padding:12px 16px}.summary-fill summary{color:#315ee7;font-weight:600}.summary-fill mark{background:#fff0ad;color:#3b3015;border-bottom:2px solid #d59112}.summary-fill h4{color:#7b879a;font-size:12px}
.summary-subtabs{display:flex;gap:12px;margin:20px 0}.summary-subtabs button{font-size:13px;min-height:38px}.summary-fill h3{margin-top:0}.summary-fill{margin:20px 0}
.summary-subtabs{flex-wrap:wrap;gap:10px}.summary-subtabs button{white-space:nowrap}
.summary-subtabs{flex-wrap:nowrap;overflow-x:auto;gap:24px;border-bottom:1px solid var(--line);margin:24px 0 20px;padding:0 2px}.summary-subtabs button{flex:0 0 auto;position:relative;border-radius:0;background:transparent;color:#7b879a;padding:12px 2px;min-height:46px;font-weight:500}.summary-subtabs button.primary{background:transparent;color:var(--blue);font-weight:600}.summary-subtabs button.primary:after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--blue);border-radius:3px}.summary-body>h2:first-child{margin-top:0}@media(max-width:540px){.summary-subtabs{gap:20px}.summary-subtabs button{font-size:12px}}
.pdf-fill-mark,.summary-fill mark{background:transparent;color:inherit;font-weight:inherit;border:0;border-radius:0;padding:0;text-decoration-line:underline;text-decoration-color:currentColor;text-decoration-thickness:2px;text-underline-offset:4px}.answer-code-fill,.answer-text-fill{background:transparent;color:inherit;font-weight:inherit;border:0;text-decoration-line:underline;text-decoration-color:currentColor;text-decoration-thickness:2px;text-underline-offset:4px}

.summary-body h4{font-size:14px;color:var(--ink,#203451);margin:20px 0 8px}.summary-subtabs{gap:28px}.summary-body>h3{margin-top:28px}.summary-body>h2{margin-bottom:22px}

#summary-panel>h3:first-child{margin-top:0}

.word-fill{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1.5px}.word-answer{line-height:1.9}.word-answer p{margin:10px 0;white-space:pre-wrap}

#exam-paper .exam-actions{display:grid;grid-template-columns:minmax(0,1fr) 104px 104px minmax(0,1fr);gap:24px;align-items:center}#exam-paper .exam-actions>button{min-width:0;min-height:38px;padding:8px 14px;font-size:13px;background:var(--blue);color:#fff}#exam-paper .exam-actions>button:not(.exam-submit):nth-last-child(2){grid-column:2;grid-row:1}#exam-paper .exam-actions>button:last-child{grid-column:3;grid-row:1}#exam-paper .exam-actions>.exam-submit{grid-column:1;grid-row:1;justify-self:start}@media(max-width:540px){#exam-paper .exam-actions{grid-template-columns:minmax(64px,1fr) 84px 84px minmax(0,1fr);gap:10px}}

#practical-main .word-answer{font-family:inherit;font-size:14px;line-height:1.9;color:#24334b;overflow-wrap:anywhere}#practical-main .word-answer p{font-size:14px;font-weight:400;line-height:1.9;margin:8px 0;white-space:normal}#practical-main .word-answer h4{font-size:15px;font-weight:600;line-height:1.8;color:#24334b;border:0;padding:0;margin:22px 0 10px}#practical-main .word-answer>:first-child{margin-top:12px}#practical-main .word-answer .word-fill{font-size:inherit;font-weight:inherit;text-decoration-thickness:1px;text-underline-offset:4px}#practical-main .practical-question h4{font-size:15px;line-height:1.8;margin:20px 0 8px}#practical-main .practical-question p{white-space:normal}#practical-main .practical-code-reference{margin-top:20px}

.word-table-wrap{width:100%;overflow-x:auto;margin:12px 0 20px}.word-table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.8}.word-table th,.word-table td{border:1px solid #dce3ee;padding:10px 12px;text-align:left;vertical-align:middle}.word-table thead th{background:#edf2fa;font-weight:600}.word-table tbody th{font-weight:400;min-width:130px}.word-table td{font-variant-numeric:tabular-nums}.word-table .word-fill{white-space:normal}@media(max-width:540px){.word-table{min-width:480px}.word-table th,.word-table td{padding:8px}}