:root{font-family:'Segoe UI','Microsoft YaHei',sans-serif;color:#273f36;background:#f7faf8;font-synthesis:none;--ink:#273f36;--muted:#74847b;--line:#dfe8e2;--accent:#28735b}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}button,input{font:inherit}button{cursor:pointer;color:inherit;background:white;border:1px solid var(--line);border-radius:8px;padding:8px 12px}button:hover{background:#eef5f0}button[aria-pressed=true]{background:#e2f0e8;border-color:#9cc4b1;color:#205d47}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #69ac90;outline-offset:3px}[hidden]{display:none!important}.skip{position:fixed;top:-80px;left:16px;z-index:10;background:white;padding:15px}.skip:focus{top:10px}.top{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--line);background:#fff}.brand{font-size:23px;font-weight:700;letter-spacing:2px}.brand span{font-size:13px;color:var(--muted);font-weight:400;letter-spacing:0}.top nav{display:flex;gap:25px;font-size:14px}.top [aria-current]{color:var(--accent)}.workspace{display:grid;grid-template-columns:290px minmax(0,1fr);min-height:calc(100dvh - 110px)}#sidebar{padding:20px 18px;background:#f0f5f1;border-right:1px solid var(--line);height:calc(100dvh - 64px);position:sticky;top:0;overflow:auto;scrollbar-width:thin}.side-head{display:flex;justify-content:space-between;align-items:center;font-weight:600;margin-bottom:20px}.side-head button{border:0;background:transparent;font-size:23px}.search-label{font-size:12px;color:var(--muted)}.search-box{display:flex;position:relative;margin:8px 0 14px}.search-box input{width:100%;min-width:0;border:1px solid #cadbd0;border-radius:9px;background:white;padding:11px 28px 11px 10px;font-size:13px}.search-box button{position:absolute;right:3px;top:4px;border:0;padding:5px;background:transparent}.side-filters{display:flex;gap:8px}.side-filters button{font-size:12px;padding:6px 12px}#search-status{font-size:12px;color:var(--muted)}#tree details{border-bottom:1px solid #dce6df;padding:10px 0}#tree summary{cursor:pointer;font-size:14px;font-weight:600;line-height:1.7}#tree summary small{font-weight:400;color:var(--muted);margin-left:8px}#tree .module{margin:13px 0 4px;padding-left:12px;font-size:11px;color:#6b8476}#tree a{display:block;font-size:12px;line-height:1.7;padding:7px 10px 7px 14px;border-radius:7px}#tree a.active{background:#dcebe1;color:#205d47;font-weight:600}.storage-note{font-size:11px;color:#829087;line-height:1.8;margin-top:24px}#content{min-width:0;padding:0 42px 40px;outline:none}.reading-tools{display:flex;align-items:center;gap:16px;position:sticky;top:0;padding:14px 0;background:#f7faf8f5;backdrop-filter:blur(8px);z-index:2;border-bottom:1px solid var(--line);font-size:12px}.reading-tools button{font-size:12px}.mode{display:flex;margin-left:auto;gap:4px}.reading-tools>a{color:var(--muted)}#view{max-width:970px;margin:0 auto}.eyebrow{font-size:12px;color:var(--accent);letter-spacing:2px;margin:30px 0 12px}h1{font-size:32px;line-height:1.4;font-weight:600;margin:10px 0 14px;overflow-wrap:anywhere}.lead{color:#718278;line-height:1.9;font-size:15px;max-width:760px}.overview-entries{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:28px 0}.entry{padding:22px 24px;border:1px solid #d4e4da;background:linear-gradient(120deg,#fff,#ecf5ee);border-radius:15px;transition:transform .15s}.entry:hover{transform:translateY(-2px)}.entry small{color:#83a090;font-size:11px;letter-spacing:1px}.entry h2{margin:14px 0 8px;font-size:21px}.entry p{margin:0;font-size:13px;color:var(--muted);line-height:1.8}.overview-section{margin:30px 0}.overview-section h2{font-size:20px;font-weight:600}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px}.topic-list a{display:flex;gap:10px;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}.topic-list small{font-size:11px;color:var(--muted);flex-shrink:0}.resume{display:block;border-left:3px solid #80b29a;padding:12px 18px;background:#edf4ee;font-size:13px;line-height:1.8}.crumb{color:var(--muted);font-size:12px;margin-top:26px}.topic-head{border-bottom:1px solid var(--line);padding-bottom:20px}.topic-meta{font-size:11px;color:#85938a;margin-top:15px}.topic-actions{display:flex;gap:8px;margin-top:17px;flex-wrap:wrap}.topic-actions button{font-size:12px}.keypoints{padding:17px 22px;border-radius:12px;background:#eaf3ed;margin:24px 0;font-size:14px;line-height:1.9}.keypoints ul{margin:0;padding-left:19px}.lesson-block{margin:28px 0}.lesson-block h2{font-size:19px;font-weight:600;margin:0 0 12px}.lesson-block p,.lesson-block li{font-size:16px;line-height:1.95;overflow-wrap:anywhere}.lesson-block p{margin:10px 0;white-space:pre-wrap}.lesson-block ol,.lesson-block ul{padding-left:24px}.example{padding:20px 24px;background:white;border:1px solid #dce7df;border-radius:13px}.example .example-label{font-size:11px;color:#8a9d90;letter-spacing:1px}.example h2{margin-top:8px}.example details{border-top:1px solid var(--line);padding-top:14px;margin-top:15px}.example summary,.aux summary{cursor:pointer;font-size:14px;font-weight:500;line-height:1.8}.aux{border:1px solid var(--line);border-radius:11px;padding:15px 18px;margin:16px 0;line-height:1.9;font-size:13px}.aux li{margin:9px 0}.aux a{text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}.sources small{display:block;color:var(--muted);font-size:11px}.quick-list li{font-size:16px;line-height:2;margin:10px 0}.related{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.related a{font-size:13px;border:1px solid var(--line);background:white;border-radius:8px;padding:10px 14px}.prev-next{display:grid;grid-template-columns:1fr 1fr;gap:20px;border-top:1px solid var(--line);padding:25px 0;margin-top:35px;font-size:13px;line-height:1.8}.prev-next a:last-child{text-align:right}.prev-next small{display:block;color:var(--muted)}.legal{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;padding:13px 20px;font-size:11px;color:#7c8c81;background:#f0f5f1;border-top:1px solid var(--line)}.no-sidebar .workspace{grid-template-columns:minmax(0,1fr)}.no-sidebar #sidebar{display:none}.no-sidebar #content{padding-left:5vw;padding-right:5vw}.loading{padding:60px 0;color:var(--muted)}.error{padding:25px;border:1px solid #d8b9ae;background:#fff7f2;border-radius:12px}.katex-display{overflow-x:auto;overflow-y:hidden;padding:6px 0}.katex{font-size:1.08em}
@media(min-width:1450px){#content{padding-left:65px;padding-right:65px}}@media(max-width:1000px){.workspace{grid-template-columns:250px minmax(0,1fr)}#content{padding:0 24px 30px}.reading-tools{gap:8px}.reading-tools>a{display:none}h1{font-size:28px}.topic-list{grid-template-columns:1fr}}
@media(max-width:700px){.top{height:57px;padding:0 18px}.brand{font-size:20px}.top nav{gap:16px;font-size:12px}.workspace{display:block}#sidebar{position:relative;top:auto;height:auto;max-height:64dvh;border-right:0;border-bottom:1px solid var(--line);padding:16px 20px}body:not(.mobile-directory) #sidebar{display:none}#content{padding:0 20px 28px}.reading-tools{padding:10px 0;gap:6px}.reading-tools button{padding:8px 9px}.overview-entries{gap:10px;margin:22px 0}.entry{padding:18px 14px}.entry h2{font-size:19px}.entry p{font-size:12px}.eyebrow{margin-top:24px}h1{font-size:26px}.lesson-block p,.lesson-block li{font-size:16px;line-height:1.9}.example{padding:18px}.keypoints{padding:15px 18px}.legal{gap:9px;font-size:10px}.no-sidebar #content{padding-left:20px;padding-right:20px}.prev-next{gap:14px}.topic-list{grid-template-columns:1fr}}
@media print{.top,#sidebar,.reading-tools,.topic-actions,.prev-next,.legal{display:none}.workspace{display:block}#content{padding:0}.example details>*,.aux>*{display:block}.aux summary{font-weight:bold}body{background:white}h1{font-size:24px}}
.lesson-figure{display:block;max-width:100%;height:auto;margin:18px auto;border-radius:12px}
.writing-entries{margin-bottom:18px}.writing-entries .entry{border-top:3px solid #5b9172}.writing-source-note{color:#61796c;font-size:12px;line-height:1.9;padding:13px 16px;border-left:3px solid #a8cbb6;background:#eef5ef}.writing-focus{margin:34px 0 44px}.writing-focus>h2{font-size:25px;border-bottom:2px solid #b7d4c0;padding-bottom:15px}.writing-group{margin:28px 0 34px}.writing-group>h3{font-size:19px;margin-bottom:7px}.writing-types{font-size:12px;color:#407657}.writing-recognize,.writing-structure{font-size:13px;line-height:1.9;color:#647c6c;margin:7px 0}.writing-structure{margin-bottom:15px}.case-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.case-card{display:block;min-width:0;border:1px solid #d4e3d9;border-radius:12px;padding:19px;background:white;transition:background .15s,border-color .15s}.case-card:hover{background:#f1f8f2;border-color:#8cbaa0}.case-card h4{font-size:16px;line-height:1.7;margin:11px 0 9px}.case-card p{font-size:12px;line-height:1.9;color:#6b7f71;margin:0 0 13px}.case-card>small{font-size:11px;color:#477b59}.case-badge{display:inline-block;font-size:10px;color:#6a756e;border:1px solid #dce4dc;background:#f6f8f5;padding:4px 8px;border-radius:5px}.case-badge.primary{color:#326649;background:#e4f1e7;border-color:#b9d7c2}.case-source{background:#edf5ee;border:1px solid #d2e4d7;border-radius:10px;padding:17px 20px;margin:19px 0;font-size:13px;line-height:1.9}.case-source strong{color:#346a49}.case-source p{margin:6px 0}.case-source a{text-decoration:underline;text-underline-offset:3px}.case-source small{display:block;font-size:11px;color:#708275;margin-top:8px}.lesson-table-wrap{overflow:auto;margin:18px 0}.lesson-table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.9}.lesson-table th,.lesson-table td{border:1px solid #d8e4da;padding:12px 15px;text-align:left;vertical-align:top;min-width:125px}.lesson-table th{background:#ecf4ed;color:#42694e}.lesson-table td{background:white}.example details p{white-space:pre-line}.writing-lectures{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0 32px}.writing-lectures a{border:1px solid #d6e3d9;border-radius:8px;padding:11px 14px;font-size:12px;background:white;line-height:1.7}.foundation{border-top:1px solid var(--line);padding-top:18px}.foundation>summary{font-size:17px;font-weight:600;cursor:pointer}.foundation .topic-list{margin-top:20px}.course-directory>summary{font-size:16px;font-weight:600;cursor:pointer}
@media(max-width:950px){.case-grid{grid-template-columns:1fr}}@media(max-width:700px){.writing-focus>h2{font-size:21px}.case-card{padding:16px}.case-card h4{font-size:16px}.writing-focus{margin-top:28px}.lesson-table th,.lesson-table td{padding:10px}.case-source{padding:15px}.writing-group>h3{font-size:18px}}
.course-tools{display:grid;grid-template-columns:1fr auto;gap:8px 18px;align-items:center;margin:26px 0 12px}.course-search-label{grid-column:1/-1;font-size:12px;color:var(--muted)}#course-search{width:100%;min-width:0;background:white;border:1px solid #c8dcd0;border-radius:10px;padding:13px 15px;color:var(--ink);font-size:14px}.course-subjects{display:flex;gap:6px}.course-subjects button{white-space:nowrap;font-size:12px;padding:11px 13px}.course-status{font-size:12px;color:var(--muted);line-height:1.8}.course-subject{margin:30px 0 42px}.course-subject>h2{font-size:23px;font-weight:600;padding-bottom:13px;border-bottom:2px solid #aecfbc}.course-group{margin:26px 0}.course-group-head{font-size:17px;font-weight:600;margin-bottom:12px}.course-group-note{color:#72857a;font-size:12px;line-height:1.9;margin:8px 0 14px}.course-type-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.course-type{min-width:0;padding:17px 18px;border:1px solid #dce7df;border-radius:12px;background:#fff}.course-type h3{font-size:15px;font-weight:600;line-height:1.7;margin:0 0 10px}.course-links{display:grid;gap:6px}.course-link{display:grid;grid-template-columns:1fr auto;gap:2px 8px;border-radius:7px;padding:8px 10px;background:#f2f7f3}.course-link:hover{background:#e5f1e9}.course-link strong{font-size:12px;font-weight:600}.course-link span{grid-column:1/-1;grid-row:2;font-size:12px;color:#617c6a;line-height:1.6}.course-link small{font-size:10px;color:#7b8b80;align-self:center}.course-method{display:block;color:#6f8d79;font-size:11px;line-height:1.8;margin-top:10px}.handbook-heading{margin-top:44px;font-size:22px}.handbook-note{font-size:13px;color:var(--muted)}.course-version-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:22px}.course-version{border-top:1px solid var(--line);padding-top:14px;min-width:0}.course-version>a{font-size:13px}.course-version>small{display:block;font-size:11px;color:var(--muted);margin-top:7px}.course-version p{font-size:12px;line-height:1.9;margin:8px 0}.course-evidence{font-size:11px!important}
@media(max-width:1050px){.course-tools{grid-template-columns:1fr}.course-search-label{grid-column:auto}.course-type-grid{grid-template-columns:1fr}.course-subjects{justify-self:start}}
@media(max-width:700px){.course-type{padding:16px}.course-subject>h2{font-size:21px}.course-version-grid{grid-template-columns:1fr}.course-tools{margin-top:20px}.course-subject{margin-top:26px}}