:root{--bg:#f1f7fc;--paper:#ffffff;--ink:#182a3b;--muted:#617284;--line:#d0e1ef;--green:#2f6fa8;--accent:#2f6fa8}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:15px;line-height:1.6}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:4px}button{cursor:pointer}header{max-width:1380px;margin:auto;padding:24px 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;align-items:center;gap:12px;font-size:23px;font-weight:650;letter-spacing:2px}.seal{display:grid;place-items:center;background:var(--green);color:#fff;width:45px;height:45px;border-radius:10px;font-size:29px;font-family:serif}.brand small{font-size:10px;font-weight:500;display:block;letter-spacing:1px;color:var(--muted)}nav{display:flex;align-items:center;gap:25px;font-size:13px}nav a:hover{color:var(--accent)}.local{font-size:12px;color:var(--muted)}main{max-width:1240px;margin:auto;padding:44px 32px 80px;min-height:80vh}h1,h2,h3,p{margin-top:0}h1{font-family:Georgia,"Times New Roman",serif;font-weight:400;font-size:46px;line-height:1.17;letter-spacing:-1px;margin-bottom:14px}h2{font-size:23px;line-height:1.4;font-weight:550}h3{font-size:17px;font-weight:600;margin-bottom:8px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;color:var(--green);margin-bottom:15px}.muted{color:var(--muted)}.page-top{display:flex;justify-content:space-between;align-items:center;gap:25px;margin-bottom:30px}.page-top p{max-width:700px}.primary,.secondary{display:inline-flex;justify-content:center;align-items:center;gap:8px;border-radius:8px;padding:12px 20px;border:1px solid transparent;font-size:13px;font-weight:600;white-space:nowrap}.primary{background:var(--green);color:#fff}.primary:hover{background:#1e3549}.secondary{background:var(--paper);border-color:var(--line)}.secondary:hover{border-color:var(--green)}.quiet{background:none;border:0;color:var(--muted);padding:0}.full{width:100%}.banner{background:#dceaf7;border:1px solid #cedfee;border-radius:14px;padding:30px 36px;display:flex;align-items:center;justify-content:space-between;overflow:hidden;margin-bottom:42px}.banner h2{font-family:Georgia,serif;font-size:28px;font-weight:400;margin-bottom:8px}.banner p{color:#5d6b77;margin:0}.banner-sign{font-family:serif;font-size:115px;line-height:1;color:#abbac8;transform:rotate(-8deg);margin-right:25px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.section-heading h2{margin:0}.count{font-family:system-ui;font-size:12px;color:var(--muted);background:#dae9f6;border-radius:20px;padding:3px 9px;vertical-align:middle;margin-left:8px}.search{max-width:230px;padding:10px 14px;background:transparent}.book-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.book-card{border-radius:12px;overflow:hidden;background:var(--paper);border:1px solid var(--line);transition:transform .18s,box-shadow .18s}.book-card:hover{transform:translateY(-4px);box-shadow:0 10px 25px #182a3b10}.cover{height:260px;padding:25px 28px;position:relative;color:#f5f4e9;background:#344a5d;overflow:hidden;border-left:10px solid #0002}.cover.clay{background:#a5684d}.cover:after{content:'';position:absolute;border:1px solid #ffffff25;width:230px;height:230px;border-radius:50%;right:-60px;bottom:-85px}.cover-series{font-size:9px;letter-spacing:2px;color:#ffffffa6}.cover-title{font-family:Georgia,serif;font-size:34px;line-height:1.15;max-width:230px;margin-top:26px;position:relative;z-index:1}.cover-chinese{display:block;margin-top:15px;font-family:serif;letter-spacing:3px;color:#e9e2cc}.cover-mark{position:absolute;right:20px;bottom:7px;font-family:serif;font-size:80px;color:#ffffff17}.book-info{padding:20px 24px}.book-info p{font-size:12px;color:var(--muted);margin:0}.book-info p span{float:right;color:var(--green);font-size:18px}.back{display:inline-block;color:var(--muted);font-size:13px;margin-bottom:25px}.actions{display:flex;gap:10px}.lesson-list{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--paper)}.lesson-row{display:flex;align-items:center;gap:24px;padding:24px;border-bottom:1px solid var(--line)}.lesson-row:last-child{border-bottom:0}.lesson-row:hover{background:#e5f0f9}.lesson-row>div{flex:1}.lesson-row p{margin:0;color:var(--muted);font-size:13px}.lesson-number{font-family:Georgia,serif;font-size:32px;color:#8e9aa5;min-width:45px}.badge{font-size:10px;border-radius:20px;background:#dceaf7;color:var(--green);padding:5px 11px;white-space:nowrap}.badge.draft{background:#f3e8d8;color:#936639}.panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:30px}.editor{max-width:900px}.attachments{max-width:900px;margin-top:24px}label{display:block;font-size:13px;font-weight:550;margin-bottom:20px}label .muted{display:block;font-weight:400;font-size:12px;margin:4px 0}input,textarea,select{display:block;width:100%;padding:11px 13px;color:var(--ink);border:1px solid #cdd9e4;border-radius:7px;background:#ffffff;margin-top:7px}input:focus,textarea:focus{border-color:var(--green)}textarea{resize:vertical;line-height:1.8}.two{display:grid;grid-template-columns:1fr 1fr;gap:22px}.number-title{grid-template-columns:100px 1fr}.check{display:flex;align-items:center;gap:10px;margin:0}.check input{width:18px;margin:0;accent-color:var(--green)}.publish{background:#e3eef8;border-radius:8px;padding:18px;margin:20px 0}.publish p{margin:6px 0 0;font-size:12px}.drop{padding:22px;border:1px dashed #a4afb9;border-radius:9px;background:#ebf3fa}.file-row{display:flex;gap:20px;align-items:center;padding:15px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.file-row>a{flex:1}.file-row>span{font-size:11px;color:var(--muted)}.danger{color:#a34f36;background:none;border:0;padding:7px;font-size:12px}.danger-zone{margin-top:25px}.reading-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:25px;align-items:start}aside .panel{margin-bottom:22px}.prose{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.95;font-size:16px}.homework{border-top:1px solid var(--line);margin-top:35px;padding-top:30px}.next{display:block;text-align:center;margin-top:20px;font-size:13px;color:var(--green)}.resource{border-top:1px solid var(--line);padding:15px 0;overflow-wrap:anywhere}.resource a{font-size:13px;color:var(--green)}.resource small{display:block;color:var(--muted)}audio,video,.attachment-image{width:100%;margin-top:12px;max-height:350px}.student{padding:20px 0;border-top:1px solid var(--line)}summary{cursor:pointer;font-size:12px;color:var(--green)}details form{margin-top:15px}.empty{padding:60px 25px;text-align:center;grid-column:1/-1}.empty h1{font-size:32px}.empty p{color:var(--muted)}.auth-grid{display:grid;grid-template-columns:1fr 420px;gap:70px;align-items:center;max-width:1050px;margin:35px auto}.intro h1{font-size:58px}.intro>p{max-width:370px;color:var(--muted)}.hanzi{font-family:serif;color:#a3c6e4;font-size:110px;letter-spacing:15px;margin-top:20px}.hanzi span{color:#2f6fa8}.auth{padding:35px}.auth h2{font-size:25px}.auth p{font-size:13px;margin-bottom:25px}.flash{padding:14px 20px;border:1px solid #becedc;background:#e3eef8;border-radius:8px;margin-bottom:25px}.flash.error{background:#fff0e9;border-color:#ebcab7;color:#944f32}footer{max-width:1240px;margin:auto;padding:24px 32px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted);font-size:11px}[hidden]{display:none!important}@media(max-width:900px){.book-grid{grid-template-columns:repeat(2,1fr)}.auth-grid{gap:25px;grid-template-columns:1fr 360px}.intro h1{font-size:42px}.reading-grid{grid-template-columns:1fr}.page-top{align-items:flex-start;flex-direction:column}.banner-sign{display:none}}@media(max-width:600px){header{padding:18px;flex-wrap:wrap}nav{gap:17px;flex-wrap:wrap}main{padding:28px 18px 50px}h1{font-size:36px}.book-grid{grid-template-columns:1fr}.cover{height:240px}.auth-grid{grid-template-columns:1fr;margin:0}.intro{display:none}.panel{padding:22px}.section-heading{align-items:flex-start;flex-direction:column}.search{max-width:none}.banner{padding:24px}.banner h2{font-size:24px}.lesson-row{gap:12px;padding:18px}.lesson-row .badge{font-size:9px}.two{grid-template-columns:1fr}.number-title{grid-template-columns:75px 1fr;gap:12px}.actions{flex-wrap:wrap}.file-row{flex-wrap:wrap}footer{padding:20px;display:block}.auth{padding:26px}footer span{display:block}}
.editor-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:22px 0 14px}.editor-heading h2,.editor-heading h3{margin-bottom:0}.editor-heading p{margin:8px 0 0;font-size:13px}.editor-block,.word-editor{border:1px solid var(--line);border-radius:10px;padding:20px;margin:16px 0;background:#f0f6fc}.editor-block .editor-heading,.word-editor .editor-heading{margin-top:0}.row-controls,.block-toolbar{display:flex;gap:7px;flex-wrap:wrap}.row-controls button{padding:5px 12px}.block-toolbar{margin:20px 0 35px}.vocab-editor{border-top:1px solid var(--line);padding-top:12px;margin-bottom:30px}.small{font-size:12px}.save-bar{position:sticky;bottom:12px;background:var(--paper);border:1px solid var(--line);padding:12px;border-radius:10px;display:flex;align-items:center;gap:16px;box-shadow:0 5px 18px #0001;z-index:2}.save-bar span{font-size:12px}.lesson-block{margin-top:30px;padding-top:25px;border-top:1px solid var(--line)}.kind-grammar{background:#e3eff9;border:0;padding:23px;border-radius:9px}.kind-exercise{background:#f8f0e5;border:0;padding:23px;border-radius:9px}.answer{margin-top:18px}.answer summary{font-size:14px}.answer .prose{margin-top:15px}.pdf-viewer{width:100%;height:620px;border:1px solid var(--line);border-radius:8px;background:#eee;margin:15px 0}.block-image{max-width:100%;max-height:700px;display:block;margin:15px auto;object-fit:contain}.vocab-card{border-bottom:1px solid var(--line);padding:22px 0}.vocab-card:last-child{border-bottom:0}.vocab-top{display:flex;justify-content:space-between;align-items:center;gap:16px}.vocab-top strong{font-size:30px;font-weight:500}.pinyin{color:var(--green);margin:7px 0}.hide-pinyin .pinyin{visibility:hidden}.vocab-card p{margin:8px 0}.example{background:#e7f1f9;padding:12px;border-radius:7px}.anki-options{display:flex;flex-direction:column;gap:7px;font-size:12px;margin:15px 0;color:var(--green)}.preview-banner{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:13px}button:disabled{opacity:.45;cursor:not-allowed}.file-link{color:var(--green);font-size:13px}@media(max-width:600px){.editor-heading{align-items:flex-start;flex-wrap:wrap}.editor-block,.word-editor{padding:14px}.save-bar{flex-direction:column;align-items:stretch;bottom:5px}.preview-banner{flex-direction:column;align-items:stretch}.pdf-viewer{height:450px}.vocab-top{align-items:flex-start;flex-wrap:wrap}}

/* Assessments and student progress */
.analysis-section{margin-top:24px}
.table-scroll{overflow-x:auto}
.analysis-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}
.analysis-table th,.analysis-table td{padding:13px 12px;border-bottom:1px solid #d6e7f6;vertical-align:top}
.analysis-table th{font-weight:600;color:#505c67}
.analysis-table small{display:block;color:#68737d;margin-top:5px}
.metric-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin:22px 0}
.metric-grid>div,.metric-grid>section{padding:20px;background:#ecf4fb;border-radius:12px}
.metric-grid strong{display:block;font-size:26px;margin:8px 0}
.question-editor,.grade-question,.error-card{border:1px solid #d0e1ef;padding:20px;border-radius:12px;margin:16px 0;background:#fff}
.question-editor h3{margin:0}
.topic-row{display:flex;gap:16px;justify-content:space-between;padding:14px 0;border-bottom:1px solid #d6e7f6}
.topic-row span{flex-shrink:0;color:#606c77}
.student-links{display:flex;flex-wrap:wrap;gap:10px}
.progress-chart{overflow-x:auto;margin-top:22px}
.progress-chart svg{display:block;width:100%;min-width:650px;min-height:240px}
.chart-grid{stroke:#d5e4f1;stroke-width:1}
.chart-label{font-size:12px;fill:#606c77}
.chart-line{stroke:currentColor;stroke-width:2.5}
.chart-point{fill:currentColor;stroke:white;stroke-width:1}
.legend-total{color:#25333f}
.legend-listening{color:#377495}
.legend-reading{color:#306491}
.legend-writing{color:#af660d}
.chart-legend{display:flex;gap:20px;flex-wrap:wrap;margin:8px 0 20px}
.prose{white-space:pre-wrap;overflow-wrap:anywhere}
.error-card p,.grade-question p{overflow-wrap:anywhere}
@media(max-width:700px){.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-row{flex-direction:column;gap:5px}.question-editor,.grade-question,.error-card{padding:14px}.section-heading{flex-wrap:wrap;gap:12px}}

.hw-flashcard{text-align:center;max-width:680px;margin:24px auto}
.hw-flashcard[hidden]{display:none}
.hw-flashcard h2{font-size:64px;line-height:1.3;margin:28px 0}
.hw-flashcard details{margin:22px 0}
.hw-flashcard .hw-pinyin{font-size:25px;color:#516374}
.hw-options{border:0;padding:0;margin:24px 0}
.hw-options label{display:flex;align-items:center;gap:14px;border:1px solid #d1e2f0;border-radius:12px;padding:18px;margin:12px 0;cursor:pointer}
.hw-options input{width:auto;margin:0;flex-shrink:0}
.hw-options label:has(input:checked){background:#eaf3fa;border-color:#224c71}
.hw-order-answer,.hw-order-pool{display:flex;flex-wrap:wrap;gap:12px;min-height:76px;padding:16px;margin:20px 0;border-radius:12px}
.hw-order-answer{border:2px dashed #92a6b8;background:#edf5fb}
.hw-order-pool{background:#f1f7fc}
.hw-order-answer button,.hw-order-pool button{font-size:22px}
#homework-audio{padding:20px;background:#ecf4fb;border-radius:12px;margin:20px 0}
[hidden]{display:none!important}

.role-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:6px 0 4px}.role-card{display:flex;flex-direction:column;align-items:center;gap:2px;padding:16px 8px 14px;border:1px solid var(--line);border-radius:14px;background:#f6fafd;color:var(--ink);transition:transform .35s cubic-bezier(.2,.8,.2,1),opacity .35s,border-color .25s,box-shadow .35s,background .25s}.role-card img{width:96px;height:96px;transition:transform .45s cubic-bezier(.2,.8,.2,1)}.role-card b{font-size:16px}.role-card small{font-size:11px;color:var(--muted)}.role-card:hover{border-color:#7ab3de;transform:translateY(-3px)}.role-card:hover img{transform:scale(1.06) rotate(-2deg)}.role-card[aria-pressed=true]{background:#fff;border-color:#2f6fa8;box-shadow:0 10px 26px #2f6fa826;transform:translateY(-3px)}.role-card[aria-pressed=true] img{transform:scale(1.08)}.role-stage:not([data-role='']) .role-card[aria-pressed=false]{opacity:.55;transform:scale(.96)}.role-stage:not([data-role='']) .role-card[aria-pressed=false]:hover{opacity:.9}
.role-form{display:grid;grid-template-rows:0fr;opacity:0;visibility:hidden;transition:grid-template-rows .5s cubic-bezier(.2,.8,.2,1),opacity .4s .08s,visibility 0s .5s}.role-form-inner{overflow:hidden;min-height:0}.role-stage:not([data-role='']) .role-form{grid-template-rows:1fr;opacity:1;visibility:visible;transition:grid-template-rows .5s cubic-bezier(.2,.8,.2,1),opacity .4s .12s,visibility 0s}.role-hint{margin:20px 0 14px!important}
@media(prefers-reduced-motion:reduce){.role-card,.role-card img,.role-form{transition:none!important}}
.role-form-inner{padding:10px;margin:-10px}.role-hint{margin:10px 0 14px!important}