:root{font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;color:#242925;background:#f7f5f0;font-synthesis:none;--accent:#a94736;--border:#e3dfd6;--muted:#6b726b}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer;border:1px solid transparent;border-radius:10px;background:var(--accent);color:white;padding:12px 20px;font-weight:650}button:disabled{opacity:.55;cursor:wait}button:hover:not(:disabled){filter:brightness(.96)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #bc8976;outline-offset:3px}.quiet,.secondary{background:#fffefa;color:#333c34;border-color:var(--border)}a{color:var(--accent);text-underline-offset:4px}[hidden]{display:none!important}.topbar{display:flex;align-items:center;gap:18px;padding:16px 4vw;border-bottom:1px solid var(--border);background:#fffefa}.brand{display:flex;align-items:center;gap:10px;font-weight:750;text-decoration:none;color:inherit}.logo{background:var(--accent);color:white;border-radius:9px;padding:6px 10px}.topbar button{margin-left:auto}.subtle,.small{color:var(--muted);line-height:1.7}.small{font-size:13px}main{max-width:1380px;margin:auto;padding:35px 4vw 70px}h1{font-size:clamp(30px,4vw,52px);letter-spacing:-1px;line-height:1.3;margin:10px 0 22px}h2{font-size:21px;margin:0 0 12px}h3{margin:0 0 10px;font-size:21px;line-height:1.5;overflow-wrap:anywhere}p{line-height:1.8;margin:10px 0}.eyebrow{font-size:13px;font-weight:700;letter-spacing:2px;color:var(--accent)}.welcome{max-width:800px;margin:5vh auto}.welcome h1{font-size:clamp(40px,6vw,68px)}.welcome>p{font-size:17px}.role-actions{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:35px 0}.role-actions button{text-align:left;padding:24px;font-size:23px}.role-actions span{display:block;margin-top:14px;font-size:13px;font-weight:400}.page-heading,.section-heading{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:20px}.page-heading h1{font-size:34px;margin-bottom:0}.student-layout{display:grid;grid-template-columns:minmax(290px,.85fr) minmax(320px,1.4fr);gap:26px;align-items:start}.panel,.question-card{background:#fffefa;border:1px solid var(--border);border-radius:16px;padding:24px}.compose{position:sticky;top:20px}label{display:block;font-size:14px;font-weight:650;margin-bottom:8px}textarea,input,select{display:block;width:100%;padding:13px;border:1px solid #cbcfc8;border-radius:9px;background:white;color:#242925;margin:8px 0 16px}textarea{resize:vertical;font-size:20px;line-height:1.6;min-height:140px}.form-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:flex-end}.scope{border-top:1px solid var(--border);margin-top:20px;padding-top:18px;font-size:14px;line-height:1.8}summary{cursor:pointer;font-weight:650}.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.chips button,.chip{padding:7px 10px;background:#f3efe7;color:#5f584b;font-size:13px;border-radius:7px}.question-list{display:grid;gap:15px}.question-card .meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:13px;font-size:12px;color:var(--muted)}.answer{border-left:3px solid #d1dace;padding-left:14px;font-size:17px;white-space:pre-wrap;overflow-wrap:anywhere}.deferred{border-color:#ddd0bd;color:#756954}.resolved{background:#eef4ed;color:#356342}.text-button{background:transparent;color:var(--accent);padding:5px 0;font-size:14px}.empty{border:1px dashed #d3d6cc;border-radius:14px;padding:35px;color:var(--muted);text-align:center;line-height:1.8}.notice{position:sticky;bottom:10px;background:#2c352e;color:white;border-radius:10px;padding:12px 18px;max-width:700px;margin:22px auto 0}.notice:empty{display:none}.metrics{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:24px 0 12px}.metric{background:#fffefa;border:1px solid var(--border);border-radius:12px;padding:18px}.metric b{display:block;font-size:35px;margin:8px 0}.metric span{font-size:13px;color:var(--muted)}.share{display:flex;justify-content:space-between;align-items:center;gap:20px}.share a{overflow-wrap:anywhere}.filters{display:flex;gap:15px;margin-top:20px;align-items:center}.filters label{min-width:150px}.search-label{flex:1}.teacher-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.teacher-list .question-card{padding:18px}.teacher-list h3{font-size:19px}.participant-list{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:20px}details.panel{margin-top:22px}dialog{border:1px solid var(--border);border-radius:16px;padding:28px;max-width:430px;width:calc(100% - 32px)}dialog::backdrop{background:#17231866}#login-error{color:#a13325;font-size:14px}.debate-layout{display:grid;grid-template-columns:300px 1fr;gap:24px}.characters{display:grid;gap:12px;margin:20px 0}.characters button{background:#fffefa;color:inherit;border:1px solid var(--border);display:flex;align-items:center;gap:14px;text-align:left}.characters img{width:54px;height:54px;object-fit:cover;border-radius:50%}.characters button[aria-pressed=true]{border-color:var(--accent);background:#f6eae5}.characters small{display:block;font-weight:400;color:var(--muted);font-size:12px;margin-top:4px}.messages{height:390px;overflow-y:auto;padding:12px 3px;display:flex;flex-direction:column;gap:14px}.message{max-width:90%;padding:15px 18px;border-radius:12px;background:#f1efe7;white-space:pre-wrap;line-height:1.8;overflow-wrap:anywhere}.message.user{background:#eaf0e8;align-self:flex-end}.debate-compose{border-top:1px solid var(--border);padding-top:18px}.debate-compose textarea{min-height:90px;font-size:18px}.teacher-list .answer{font-size:15px}.questions-area .section-heading{align-items:flex-end}
@media(max-width:850px){.student-layout,.debate-layout{grid-template-columns:1fr}.compose{position:static}.metrics{grid-template-columns:repeat(3,1fr)}.teacher-list{grid-template-columns:1fr}.participant-list{grid-template-columns:repeat(2,1fr)}.filters{flex-wrap:wrap}.filters label{flex:1}.page-heading{align-items:flex-start;flex-direction:column}.topbar .subtle{display:none}}
@media(max-width:500px){main{padding:26px 16px 50px}.role-actions{grid-template-columns:1fr}.panel,.question-card{padding:19px}.metrics{grid-template-columns:repeat(2,1fr)}.share{align-items:flex-start;flex-direction:column}.section-heading{align-items:flex-start;flex-direction:column}.topbar{padding:12px 16px}.topbar button{padding:8px 12px}.form-actions button{padding:11px 15px}.welcome{margin:3vh auto}.characters{grid-template-columns:1fr}.filters label{min-width:130px}.question-card h3{font-size:20px}}

/* Compact classroom layout: questions and conversation take priority. */
:root{--question-font:clamp(30px,2.35vw,44px)}
.topbar{padding:8px 16px;min-height:46px;font-size:15px;gap:10px}.logo{padding:3px 8px;border-radius:6px}.topbar button{padding:6px 12px;font-size:13px}
main{max-width:none;width:100%;padding:14px 16px 24px}.welcome{max-width:540px;margin:12vh auto}.welcome h1{font-size:32px;letter-spacing:0;text-align:center}.role-actions{gap:12px;margin:24px 0}.role-actions button{text-align:center;padding:24px 15px;font-size:24px}
.page-heading{margin-bottom:12px;gap:12px}.page-heading h1{font-size:24px;letter-spacing:0;margin:0}.section-heading{margin-bottom:10px;gap:10px}.section-heading h2,h2{font-size:16px;margin:0}.panel,.question-card{border-radius:10px;padding:14px;box-shadow:none}.small{font-size:12px}.form-actions{gap:8px}.form-actions button{padding:8px 12px;font-size:14px}label{font-size:13px}.student-layout{grid-template-columns:minmax(260px,29%) minmax(0,1fr);gap:16px}.compose{top:12px}textarea{font-size:24px;min-height:110px;margin:8px 0 10px;padding:10px}.scope{margin-top:12px;padding-top:10px}.scope p{font-size:12px}.scope summary{font-size:13px}.compose>details.small{margin-top:12px}.compose .text-button{font-size:12px;margin-top:10px}.question-list{display:block;columns:2;column-gap:12px}.question-list .question-card{display:inline-block;width:100%;margin-bottom:12px;break-inside:avoid}.question-card h3{font-size:var(--question-font);font-weight:650;line-height:1.4;margin-bottom:10px}.question-card .answer{font-size:clamp(22px,1.7vw,30px);line-height:1.6;margin:10px 0}.question-card .deferred{font-size:16px}.question-card .meta{font-size:11px;margin-bottom:8px;gap:6px}.question-card .chip{padding:3px 6px;font-size:11px}.question-card>button{font-size:13px;padding:7px 10px}.empty{font-size:16px;padding:24px}.notice{position:static;font-size:13px;padding:7px 12px;margin:12px auto 0}.share-toggle{font-size:12px;margin:0 0 8px}.share-toggle .share{padding:12px;justify-content:flex-start;font-size:13px}.metrics{display:flex;flex-wrap:wrap;gap:8px 24px;margin:10px 0}.metric{display:flex;align-items:baseline;gap:8px;border:0;background:none;padding:0;border-radius:0}.metric b{display:inline;font-size:20px;margin:0}.metric span{font-size:12px}.count-note{margin:0 0 8px}.board{padding:0;border:0;background:none}.board>.section-heading{float:right;margin:0}.board>.section-heading h2{display:none}.board>.section-heading button{font-size:12px;padding:7px 12px}.filters{margin:0;gap:10px;padding-right:110px}.filters label{display:flex;align-items:center;gap:6px;min-width:0;margin:0;font-size:12px;white-space:nowrap}.filters input,.filters select{width:auto;max-width:210px;font-size:13px;padding:6px 8px;margin:0}.filters .search-label input{width:100%;min-width:80px}.chips{gap:6px;margin:10px 0}.chips .chip{font-size:12px;padding:3px 7px}.teacher-list{display:block;columns:3;column-gap:12px}.teacher-list .question-card{display:inline-block;width:100%;padding:10px 12px;margin:0 0 10px;break-inside:avoid}.teacher-list h3{font-size:var(--question-font);line-height:1.36;margin:0 0 6px}.teacher-list small{font-size:10px;color:var(--muted)}.teacher-list details{margin-top:6px;font-size:12px}.teacher-list .answer{font-size:22px}.font-control{display:flex;align-items:center;gap:5px;font-size:12px;margin:0}.font-control select{width:auto;font-size:13px;padding:6px;margin:0}#teacher-view>details.panel{padding:10px;font-size:12px;margin-top:8px}.participant-list p{font-size:12px;margin:0}.participant-list{margin-top:12px}.xiaosi-page .page-heading{margin:0 0 8px}.debate-layout{display:flex;flex-direction:column;gap:8px}.perspectives .characters{display:flex;gap:8px;margin:0}.characters button{padding:6px 20px;font-size:16px;border-radius:7px}.debate-main{padding:0;border:0;background:none}.messages{height:calc(100dvh - 355px);min-height:220px;padding:10px 0;gap:12px}.message{font-size:var(--question-font);line-height:1.45;max-width:92%;padding:12px 16px;border-radius:9px}.debate-main>.chips{margin:8px 0}.debate-main>.chips button{font-size:12px;padding:5px 9px}.debate-compose{padding-top:10px;display:grid;grid-template-columns:1fr auto;gap:8px 12px}.debate-compose>label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.debate-compose textarea{margin:0;min-height:76px;font-size:22px;grid-column:1}.debate-compose .form-actions{grid-column:2;align-content:center}.debate-compose .small{grid-column:1 / -1;margin:0}.small:empty{display:none}
@media(min-width:1700px){.teacher-list{columns:4}}
@media(max-width:1100px){.question-list{columns:1}.teacher-list{columns:2}.filters{flex-wrap:wrap}.filters label{flex:initial}.page-heading{flex-direction:row;align-items:center}.debate-compose{grid-template-columns:1fr}.debate-compose .form-actions{grid-column:1}}
@media(max-width:700px){main{padding:12px 10px 20px}.student-layout{grid-template-columns:1fr;gap:14px}.compose{position:static}.teacher-list{columns:1}.page-heading{flex-wrap:wrap}.page-heading h1{font-size:21px}.question-card h3,.teacher-list h3{font-size:26px}.question-card .answer{font-size:21px}.question-card .deferred{font-size:15px}.role-actions{grid-template-columns:1fr}.filters{padding-right:0;clear:both}.board>.section-heading{float:none;justify-content:flex-end}.filters label{flex:1}.filters input,.filters select{max-width:100%}.filters .search-label{flex-basis:100%}.section-heading{flex-direction:row;align-items:center}.metrics{gap:7px 14px}.messages{height:calc(100dvh - 345px);min-height:200px}.message{font-size:24px}.debate-compose textarea{font-size:22px}.form-actions{justify-content:flex-start}.welcome{margin:10vh auto}.participant-list{grid-template-columns:1fr 1fr}}
/* Collection and requested answers are distinct steps. */
.enroll{max-width:360px}.enroll input{font-size:26px}.enroll button{width:100%}#student-number-error{color:#a13325}.student-steps{display:flex;gap:10px;margin:0 0 12px}.student-steps button{padding:8px 14px;font-size:14px}.student-steps [aria-current=step]{background:#a94736;color:#fff;border-color:#a94736}#begin-answer{width:100%;margin-top:18px;font-size:16px}body[data-role=student][data-stage=answer] .student-layout{grid-template-columns:minmax(0,1fr)}.answer-controls{margin-bottom:14px}.answer-controls p{margin:0 0 8px;font-size:17px}.answer-controls .form-actions{justify-content:flex-start}.question-choice{display:flex;align-items:flex-start;gap:10px;font-size:var(--question-font);line-height:1.4;font-weight:650;margin:0}.question-choice input{appearance:auto;width:22px;height:22px;flex:0 0 22px;margin:10px 0 0;padding:0;accent-color:#a94736}.question-choice span{overflow-wrap:anywhere}.teacher-list .question-card>button{display:block;margin-top:10px}#school-filter{width:90px}.filters{flex-wrap:wrap}.filters .search-label{min-width:200px}body[data-stage=answer] .question-list{columns:3}body[data-role=student] .page-heading>.quiet{padding:6px 10px;font-size:12px}
@media(min-width:1700px){body[data-stage=answer] .question-list{columns:4}}
@media(max-width:1100px){body[data-stage=answer] .question-list{columns:2}}
@media(max-width:700px){body[data-stage=answer] .question-list{columns:1}.question-choice{font-size:26px}.filters .search-label{min-width:0}.question-choice input{margin-top:7px}}