:root{--ink:#203b36;--muted:#70827b;--green:#246b55;--line:#dce6de;--paper:#fffefa;--bg:#f5f6ef;--accent:#e9efce;font-family:"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0;line-height:1.65}a{color:var(--green);text-decoration:none}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #93bc83;outline-offset:3px}.site-header{background:var(--paper);border-bottom:1px solid var(--line)}.header-inner{max-width:1160px;margin:auto;min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px 28px}.brand{display:flex;align-items:center;gap:12px;font-size:21px;font-weight:750;color:var(--ink);letter-spacing:1px}.brand-icon{display:grid;place-items:center;width:43px;height:43px;background:var(--green);color:white;border-radius:13px;font-size:24px}.brand small{display:block;font-size:9px;letter-spacing:3px;color:var(--muted);line-height:1.2}.header-inner nav{display:flex;align-items:center;gap:22px;font-size:14px;flex-wrap:wrap}.header-inner nav form{margin:0}.text-button{border:0;background:none;color:var(--muted);padding:5px 0}.container{max-width:1160px;margin:auto;padding:40px 28px 64px;min-height:calc(100vh - 200px)}.page-intro{padding:16px 0 22px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:650;color:var(--green)}h1{font-size:36px;line-height:1.35;letter-spacing:-.5px;margin:14px 0}h2{font-size:20px;margin:0 0 16px}h3{font-size:18px;margin:8px 0}p{margin:10px 0}.muted{color:var(--muted)}.small{font-size:13px}.panel{background:var(--paper);border:1px solid var(--line);border-radius:16px}.filters{display:flex;gap:16px;align-items:flex-end;padding:22px;margin:10px 0 32px}.filters>div:first-child{flex:1.6}.filters>div{flex:1;min-width:0}.filters input,.filters select{width:100%}label{display:block;font-size:13px;font-weight:600;margin:0 0 7px}input,select{color:var(--ink);background:white;border:1px solid #cbd8ce;border-radius:8px;padding:10px 12px;min-height:44px;min-width:0}input[type=checkbox]{min-height:0;width:18px;height:18px;accent-color:var(--green)}.primary,.secondary{border:0;border-radius:8px;padding:11px 20px;min-height:44px;font-weight:600;white-space:nowrap}.primary{color:white;background:var(--green)}.primary:hover{background:#18513e}.secondary{color:var(--green);background:#eaf0e7}.wide{width:100%;display:flex;justify-content:space-between}.reset{font-size:13px;padding:10px 0}.section-label{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px}.section-label h2{color:var(--ink);margin:0}.day-section{margin:22px 0 32px}.day-title{display:flex;align-items:center;gap:14px;font-size:16px;margin-bottom:14px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.course-card{padding:23px;display:block;color:var(--ink);transition:border-color .15s,transform .15s}.course-card:hover{border-color:#82a98b;transform:translateY(-2px)}.course-top,.course-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px}.subject-chip,.status-chip{background:#ecf0df;color:var(--green);padding:4px 10px;border-radius:6px;font-size:12px}.course-card h3{margin:20px 0 8px}.course-card p{font-size:13px}.course-bottom{border-top:1px solid #edf0e8;margin-top:22px;padding-top:15px;color:var(--green);font-size:13px}.pager{display:flex;gap:24px;justify-content:center;align-items:center;margin-top:35px;font-size:14px}.empty{text-align:center;padding:48px 24px;margin-top:24px}.back-link{font-size:14px}.lesson-heading{margin:24px 0 30px}.lesson-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start}.lesson-nav{padding:24px;position:sticky;top:20px;display:flex;flex-direction:column;gap:16px}.lesson-nav a{font-size:14px}.lesson-nav p{border-top:1px solid var(--line);padding-top:18px}.summary{padding:32px;overflow-wrap:anywhere}.article-label{font-size:12px;color:var(--green);border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:24px}.markdown{font-size:15px;line-height:1.95}.markdown h1{font-size:27px}.markdown h2{font-size:21px;margin:28px 0 12px}.markdown h3{margin-top:22px}.markdown pre{white-space:pre-wrap;background:#f1f4ec;padding:16px;border-radius:8px}.markdown code{background:#edf1e6;padding:2px 5px;border-radius:4px}.markdown table{border-collapse:collapse;display:block;overflow:auto;max-width:100%}.markdown th,.markdown td{border:1px solid var(--line);padding:8px 12px}.attachments{padding:28px;margin-top:24px}.attachment{border-top:1px solid var(--line);padding:18px 0;overflow-wrap:anywhere}.attachment>span{margin-left:10px}.attachment audio{width:100%;display:block;margin-top:14px}.board-image{display:block;max-width:100%;height:auto;border-radius:8px;margin-top:16px}.settings-form{padding:26px}.settings-form>input{width:100%;margin-bottom:20px}.settings-form h2:not(:first-child){margin-top:28px}.check{display:flex;align-items:center;gap:9px;font-weight:400;margin:14px 0}.settings-form .primary{margin-top:16px}.validation{color:#9b3d2d;font-size:14px;margin:12px 0}.validation ul{padding-left:20px}.validation:empty{display:none}.notice{background:#e4efdc;border:1px solid #c1d8b3;padding:14px 20px;border-radius:9px;margin-bottom:24px}.admin-list{display:grid;gap:12px;margin-top:20px}.admin-row{padding:20px 24px;display:flex;justify-content:space-between;align-items:center;gap:20px;color:var(--ink)}.admin-row p{margin:3px 0}.access-row{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:16px;padding:16px 0;overflow-wrap:anywhere}.file-list{padding-left:20px;font-size:12px;overflow-wrap:anywhere}.login-wrap{display:grid;grid-template-columns:1fr 440px;gap:80px;align-items:center;max-width:960px;margin:60px auto}.login-intro h1{font-size:52px;line-height:1.3;margin:20px 0}.login-intro p{color:var(--muted);line-height:2}.intro-note{margin-top:36px;display:inline-block;padding:10px 18px;background:var(--accent);border-radius:8px;font-size:13px}.login-card{padding:36px}.login-card h2{font-size:27px;margin-top:14px}.login-card input{width:100%;margin-bottom:6px}.login-card form{margin:28px 0 20px}.login-card button{margin-top:18px}.site-footer{border-top:1px solid var(--line);max-width:1104px;margin:0 auto;padding:24px 0 28px;display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}@media(max-width:950px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.login-wrap{gap:36px;grid-template-columns:1fr 400px}.lesson-layout{grid-template-columns:220px minmax(0,1fr)}.filters{flex-wrap:wrap}.filters>div:first-child{flex-basis:100%}}@media(max-width:650px){.header-inner{padding:14px 20px;min-height:74px;align-items:flex-start}.brand{font-size:18px;white-space:nowrap}.brand-icon{width:37px;height:37px;font-size:21px}.header-inner nav{gap:12px;justify-content:flex-end;font-size:12px}.container{padding:24px 18px 42px}h1{font-size:28px}.page-intro{padding:8px 0 18px}.page-intro p{font-size:14px}.filters{padding:18px;gap:12px}.filters>div{flex-basis:calc(50% - 12px)}.filters button{flex:1}.course-grid{grid-template-columns:1fr}.course-card{padding:22px}.lesson-layout{display:block}.lesson-nav{position:static;margin-bottom:18px;display:flex;flex-direction:row;flex-wrap:wrap;padding:18px;font-size:13px}.lesson-nav p{display:none}.summary{padding:23px}.markdown{font-size:14px}.attachments{padding:22px}.settings-form{margin-bottom:20px}.admin-row{align-items:flex-start;flex-wrap:wrap;padding:18px;gap:12px}.admin-row>div{flex-basis:100%}.login-wrap{display:block;margin:15px auto}.login-intro h1{font-size:35px}.login-intro p,.intro-note{display:none}.login-intro{margin:0 0 25px}.login-card{padding:26px}.site-footer{padding:22px 18px;display:block}.site-footer span{display:block;margin-top:4px}}

.transcript{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.8 inherit;background:#f4f6ee;padding:16px;border-radius:8px;max-height:620px;overflow:auto}
.validation-summary-valid{display:none}.transcript{font-family:inherit;font-size:14px;line-height:1.8}.math-display{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:8px 2px;overscroll-behavior-x:contain}.math-display .katex-display{margin:0.6em 0;overflow-wrap:normal}.math-inline{overflow-wrap:normal}.markdown .katex{font-size:1.08em}.math-error{font-family:Consolas,monospace;white-space:pre-wrap;color:#9b3d2d}.math-inline.math-error{overflow-wrap:anywhere}

.knowledge-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:24px;align-items:start}.knowledge-nav{padding:22px;position:sticky;top:20px;display:flex;flex-direction:column;gap:12px;font-size:14px}.knowledge-nav a{display:flex;justify-content:space-between;gap:10px}.knowledge-nav p{border-top:1px solid var(--line);padding-top:16px;margin:0}.knowledge-section{margin:0 0 30px}.knowledge-section h2{font-size:18px;margin:0 0 14px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;align-items:start}.knowledge-card{background:var(--paper);border:1px solid var(--line);border-radius:12px;overflow:hidden}.knowledge-card[open]{grid-column:1/-1}.knowledge-card summary{list-style:none;cursor:pointer;padding:16px 18px;display:flex;justify-content:space-between;align-items:baseline;gap:12px}.knowledge-card summary::-webkit-details-marker{display:none}.knowledge-card summary::after{content:"展开";font-size:12px;color:var(--green);white-space:nowrap}.knowledge-card[open] summary::after{content:"收起"}.card-title{font-weight:650;line-height:1.5}.card-key{font-size:11px;color:var(--muted);letter-spacing:.5px}.card-body{border-top:1px solid var(--line);padding:16px 18px;font-size:14px}@media(max-width:650px){.knowledge-layout{display:block}.knowledge-nav{position:static;margin-bottom:16px;flex-direction:row;flex-wrap:wrap}.knowledge-nav p{display:none}.knowledge-card[open]{grid-column:auto}}.knowledge-card:target{border-color:#82a98b;box-shadow:0 0 0 2px #cfe0c4}

.device-connection,.device-create{margin-bottom:24px}.device-connection input{font-family:Consolas,monospace}.device-danger{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.device-danger summary{cursor:pointer;color:var(--green)}.device-actions{display:flex;flex-wrap:wrap;gap:10px}.device-list h2{overflow-wrap:anywhere}.device-connection .secondary{display:inline-block}