:root{color-scheme:light;--paper:#fafaf7;--white:#fff;--ink:#27352d;--muted:#778078;--line:#dfe4dc;--green:#315e49;--soft:#edf1e8;--sand:#f3eee3;--red:#9c4b36;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0;-webkit-font-smoothing:antialiased}a{color:var(--green);text-underline-offset:4px}button,input,select{font:inherit;touch-action:manipulation}button,.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:44px;border:1px solid var(--green);border-radius:8px;background:var(--green);color:white;padding:10px 17px;text-decoration:none;cursor:pointer;transition:background .15s}button:hover:not(:disabled),.button:hover{background:#234a37}button:disabled{opacity:.45;cursor:wait}button.secondary,.button.secondary{color:var(--green);background:white;border-color:#c9d3c6}button.secondary:hover,.button.secondary:hover{background:var(--soft)}.quiet{background:transparent!important;color:var(--green)!important;border-color:transparent!important;padding:8px 5px}.small{font-size:13px;padding:7px 12px;min-height:38px}input,select{border:1px solid #cbd4c7;background:white;color:var(--ink);border-radius:8px;padding:12px;max-width:100%}input:focus,select:focus,button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid #729879;outline-offset:3px}input[type=checkbox]{width:18px;height:18px;accent-color:var(--green)}h1{font-weight:550;letter-spacing:-.04em;font-size:38px;line-height:1.5;margin:10px 0 15px}h2{font-size:25px;line-height:1.55;font-weight:550;margin:0 0 14px}h3{font-size:17px;font-weight:550;line-height:1.6;margin:0 0 10px}p{font-size:15px;line-height:1.9;margin:10px 0}.muted{color:var(--muted)}.caption{font-size:12px;color:var(--muted);line-height:1.8}.eyebrow{color:var(--green);font-size:12px;letter-spacing:.08em;margin:0 0 12px}.site-header{max-width:1240px;padding:25px 42px;min-height:90px;margin:auto;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:15px}.brand{color:var(--ink);text-decoration:none;white-space:nowrap;font-size:18px;font-weight:600}.brand span{font-size:12px;font-weight:400;padding-left:17px;margin-left:17px;border-left:1px solid var(--line)}#account{display:flex;gap:18px;align-items:center;font-size:12px}main{max-width:1156px;padding:48px 42px 85px;margin:auto;min-height:calc(100vh - 180px)}.site-footer{max-width:1156px;margin:auto;padding:23px 42px;display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.site-footer a{color:var(--muted)}.entry{max-width:960px;margin:35px auto 0;display:grid;grid-template-columns:1fr 350px;gap:90px;align-items:center}.entry-intro h1{font-family:Georgia,"Songti SC","STSong",serif;font-size:45px;line-height:1.65;font-weight:500;letter-spacing:-.035em}.entry-intro>p{max-width:420px}.entry-list{margin-top:32px;border-top:1px solid var(--line)}.entry-list>div{padding:14px 0;display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);font-size:14px}.entry-list small{font-size:12px;color:var(--muted)}.login{background:white;padding:28px;border:1px solid var(--line);border-radius:14px}.login h2{font-size:23px}.login label{display:block;font-size:13px;margin:20px 0 8px}.login input,.login button[type=submit]{width:100%;font-size:16px;min-height:48px}.login button[type=submit]{margin-top:22px}.login details{margin-top:20px}.login details summary{cursor:pointer;font-size:13px;color:var(--green)}.login .caption{margin:17px 0 0}.login.admin{max-width:400px;margin:40px auto}.error{color:var(--red);font-size:13px;line-height:1.8;white-space:pre-wrap}.error:empty{display:none}.page-heading{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:35px}.page-heading h1{font-size:32px}.identity{font-size:12px;color:var(--muted)}.identity code{font-family:ui-monospace,monospace;color:var(--ink);font-size:12px}.course-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}.course-card{background:white;border:1px solid var(--line);border-radius:14px;padding:29px;display:flex;flex-direction:column;position:relative;overflow:hidden}.course-card h2{font:31px/1.5 Georgia,"Songti SC",serif;font-weight:500;margin:8px 0}.course-card .description{color:var(--muted);font-size:14px;min-height:80px;max-width:350px}.course-meta{display:flex;gap:17px;color:var(--muted);font-size:12px;padding:18px 0;margin-top:7px;border-top:1px solid var(--line)}.course-card .bottom{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-top:auto;padding-top:9px}.badge{font-size:11px;letter-spacing:.03em;color:var(--green);background:var(--soft);border:1px solid #dce5d5;border-radius:30px;padding:4px 10px;width:max-content}.badge.locked{color:#89765d;background:#f6f2e9;border-color:#e9e0d0}.course-number{font:74px/1 Georgia,serif;color:#e9ede5;position:absolute;top:27px;right:25px;pointer-events:none}.course-card.method .course-number{color:#eee9dd}.course-card .eyebrow,.course-card h2{position:relative}.guidance{padding:19px 0;margin-top:23px;font-size:13px;line-height:1.9;color:var(--muted);max-width:750px}.recovery-banner{max-width:1072px;margin:24px auto 0;background:var(--sand);border:1px solid #e4dbc6;padding:20px 24px;border-radius:12px;display:flex;justify-content:space-between;gap:25px;align-items:center}.recovery-banner p{font-size:13px;margin:0}.recovery-banner strong{font-size:14px;font-weight:550}.recovery-banner code{display:block;margin:8px 0;overflow-wrap:anywhere;font:14px/1.7 ui-monospace,monospace}.recovery-banner .actions{flex-shrink:0}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.course-intro{max-width:680px;margin-bottom:28px}.course-intro h1{font:38px/1.5 Georgia,"Songti SC",serif;font-weight:500}.back{display:inline-block;font-size:13px;margin-bottom:28px;text-decoration:none}.resource-strip{display:flex;gap:12px 22px;flex-wrap:wrap;padding:18px 0 24px;margin-bottom:24px;border-bottom:1px solid var(--line);font-size:13px}.resource-strip a{line-height:1.8}.module{margin:26px 0}.module>summary{cursor:pointer;font-size:15px;color:var(--green);padding:10px 0;display:flex;justify-content:space-between;gap:20px}.module>summary small{color:var(--muted);font-size:12px;font-weight:400}.lesson-row{display:grid;grid-template-columns:40px minmax(0,1fr) 70px 65px;align-items:center;gap:15px;padding:17px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}.lesson-row:hover{background:#f3f5ef}.lesson-row .number{font:17px Georgia,serif;color:#8c978b}.lesson-row .title{font-size:14px;line-height:1.7}.lesson-row .time,.lesson-row .status{font-size:12px;color:var(--muted);text-align:right}.lesson-row .status.done{color:var(--green)}.lock-panel{padding:25px 28px;background:var(--sand);border:1px solid #e5dcc9;border-radius:12px;margin:25px 0}.lock-panel p{font-size:14px}.lock-panel strong{font-weight:550}.course-toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line);padding-bottom:18px;margin:20px 0}.course-toolbar input{max-width:330px;font-size:14px}.continue{background:var(--soft);border:1px solid #dce5d5;padding:20px 24px;border-radius:12px;margin:25px 0;display:flex;justify-content:space-between;gap:25px;align-items:center}.continue p{font-size:14px;margin:0}.learn-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:32px;align-items:start}.lesson-heading h1{font-size:25px;letter-spacing:-.02em;line-height:1.65;margin-bottom:22px}.video-frame{background:#1f2824;border-radius:12px;overflow:hidden;aspect-ratio:16/9;display:flex;align-items:center}.video-frame video{display:block;width:100%;max-height:100%;background:#1f2824}.video-tools{display:flex;justify-content:space-between;gap:15px;align-items:center;margin:13px 0;font-size:12px;color:var(--muted)}.video-tools label{display:flex;align-items:center;gap:8px}.video-tools select{padding:5px 7px;font-size:13px}.lesson-nav{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:23px 0 28px}.lesson-nav .button{font-size:13px}.syllabus-side{background:#f0f3eb;border:1px solid var(--line);border-radius:12px;padding:20px;position:sticky;top:22px}.syllabus-side h2{font-size:15px}.syllabus-side .side-scroll{max-height:65vh;overflow:auto;overscroll-behavior:contain}.side-link{display:block;font-size:12px;line-height:1.8;padding:11px 8px;border-bottom:1px solid #dce2d5;text-decoration:none;color:#667460}.side-link.active{background:white;color:var(--green);border-radius:6px}.tabs{display:flex;gap:22px;border-bottom:1px solid var(--line);margin:26px 0 18px;overflow:auto}.tabs button{background:transparent;color:var(--muted);border:0;border-radius:0;padding:12px 0;white-space:nowrap}.tabs button[aria-selected=true]{color:var(--green);border-bottom:2px solid var(--green)}.reader{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden;min-height:180px}.reader iframe{width:100%;height:680px;display:block;border:0;background:white}.reader pre{font:16px/1.9 -apple-system,"PingFang SC",sans-serif;white-space:pre-wrap;overflow-wrap:anywhere;padding:23px;margin:0;max-height:680px;overflow:auto}.reader .reader-top{display:flex;justify-content:space-between;padding:12px 17px;border-bottom:1px solid var(--line);font-size:12px}.chapter-list{border-block:1px solid var(--line);margin:20px 0;padding:13px 0}.chapter-list summary{font-size:13px;cursor:pointer;color:var(--green)}.chapter-list button{display:block;width:100%;text-align:left;justify-content:start;background:none;color:var(--ink);border:0;padding:8px 0;font-size:13px}.chapter-list button span{font-size:11px;color:var(--muted);margin-right:9px}.admin-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px}.admin-top input{min-width:270px;font-size:14px}.admin-help{font-size:13px;line-height:1.9;color:var(--muted);margin-bottom:25px;max-width:800px}.learner-table{border-top:1px solid var(--line);width:100%}.learner-table .table-head,.learner-table .learner-row{display:grid;grid-template-columns:minmax(200px,1fr) 130px 130px 120px;gap:18px;align-items:center}.table-head{padding:12px 0;font-size:12px;color:var(--muted)}.learner-row{padding:20px 0;border-bottom:1px solid var(--line)}.learner-row .student-name{font-size:14px;overflow-wrap:anywhere}.learner-row .caption{margin-top:4px}.learner-row label{display:flex;gap:9px;align-items:center;font-size:13px;min-height:44px}.learner-row .saved-label{font-size:11px;color:var(--green)}.pagination{display:flex;justify-content:space-between;align-items:center;margin-top:24px;font-size:12px;color:var(--muted)}.empty{padding:40px 0;color:var(--muted);font-size:14px;line-height:1.9}#notice{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:calc(100vw - 35px);padding:13px 20px;background:#2a4b37;color:white;border-radius:9px;font-size:13px;line-height:1.8;z-index:100}.account-panel{max-width:680px}.account-panel h1{font-size:29px}.account-block{padding:24px 0;border-bottom:1px solid var(--line)}.account-block h2{font-size:17px}.account-block p{font-size:14px}.account-block code{font-family:ui-monospace,monospace;overflow-wrap:anywhere}progress{accent-color:var(--green);height:5px;width:100%;border:0}.progress-caption{font-size:12px;color:var(--muted);margin:12px 0 7px}.button-row{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}[hidden]{display:none!important}
@media(max-width:1000px){.entry{gap:45px;grid-template-columns:1fr 330px}.entry-intro h1{font-size:38px}.learn-layout{grid-template-columns:minmax(0,1fr) 210px;gap:22px}.course-number{font-size:64px}.learner-table .table-head,.learner-table .learner-row{grid-template-columns:minmax(160px,1fr) 100px 100px 100px;gap:10px}}
@media(max-width:720px){.site-header{padding:19px 20px;min-height:78px}.brand{font-size:17px}.brand span{display:block;border:0;padding:0;margin:4px 0 0;font-size:11px}#account{gap:9px;font-size:11px}main{padding:28px 19px 60px}.site-footer{padding:22px 20px;font-size:11px}.entry{display:flex;flex-direction:column;gap:29px;margin:10px 0}.entry-intro{width:100%}.entry-intro h1{font-size:34px;line-height:1.65}.entry-intro p{font-size:14px}.entry-list{margin-top:22px}.login{width:100%;max-width:460px;padding:24px}.entry-list>div{padding:12px 0}.page-heading{align-items:start;gap:12px;margin-bottom:25px}.page-heading h1{font-size:29px}.page-heading .identity{font-size:11px}.course-grid{grid-template-columns:1fr;gap:18px}.course-card{padding:25px}.course-card .description{min-height:0;margin-bottom:20px}.course-card h2{font-size:29px}.course-number{font-size:68px}.course-meta{margin-top:0}.recovery-banner{margin:18px 19px 0;padding:18px;display:block}.recovery-banner .actions{margin-top:13px}.course-intro h1{font-size:33px}.course-intro p{font-size:14px}.back{margin-bottom:20px}.lesson-row{grid-template-columns:28px minmax(0,1fr) 45px;gap:10px;padding:16px 0}.lesson-row .title{font-size:13px}.lesson-row .time{display:none}.lesson-row .status{font-size:10px}.module>summary{font-size:14px}.resource-strip{gap:12px 18px;font-size:12px}.course-toolbar{flex-wrap:wrap;gap:12px}.course-toolbar input{max-width:none;width:100%;font-size:16px}.lock-panel{padding:19px}.continue{padding:18px;gap:15px}.continue .button{font-size:12px;white-space:nowrap}.learn-layout{display:block}.syllabus-side{position:static;margin-top:32px;padding:18px}.syllabus-side .side-scroll{max-height:320px}.lesson-heading h1{font-size:23px}.video-frame{border-radius:8px}.lesson-nav{gap:7px}.lesson-nav .button,.lesson-nav button{font-size:12px;padding:8px 10px}.video-tools{font-size:11px;align-items:start}.video-tools select{font-size:13px}.tabs{gap:20px}.tabs button{font-size:13px}.reader iframe{height:600px}.reader pre{padding:19px;font-size:16px}.admin-top{align-items:stretch;flex-wrap:wrap}.admin-top input{min-width:0;flex:1;font-size:16px}.table-head{display:none!important}.learner-table .learner-row{grid-template-columns:1fr 1fr;gap:10px;padding:20px 0}.learner-row>div:first-child{grid-column:1/-1;margin-bottom:4px}.learner-row>div:last-child{grid-column:1/-1;display:flex;align-items:center;gap:12px;margin-top:7px}.learner-row button{min-width:120px}.learner-row label{font-size:14px}.account-block p{font-size:13px}.login.admin{margin-top:20px}.identity code{font-size:11px}.guidance{font-size:12px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.file-open{padding:24px}

.media-options{display:flex;align-items:center;gap:15px}.media-options input{width:15px;height:15px}.media-options label{white-space:nowrap}