@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;600;700&display=swap');
:root{--ink:#19243a;--muted:#73809a;--line:#e7ebf2;--bg:#f6f8fc;--card:#fff;--primary:#3456e8;--primary-dark:#2745ce;--mint:#d9f6ec;--mint-ink:#168563;--lav:#f0edff;--lav-ink:#6f54ce;}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans','Noto Sans TC',sans-serif}.shell{max-width:1180px;margin:auto;padding:0 32px}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:11px;align-items:center}.brand-mark{display:grid;place-items:center;background:var(--ink);color:white;border-radius:11px;width:38px;height:38px;font-weight:700;font-size:12px;letter-spacing:-.5px}.brand strong{display:block;font-size:15px}.brand small{color:var(--muted);font-size:11px}.top-actions{display:flex;align-items:center;gap:13px;color:var(--muted);font-size:12px}.live-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#25bd83;box-shadow:0 0 0 4px #e0f8ee}.icon-button{border:0;background:transparent;font-size:22px;color:#8994aa}.avatar{display:grid;place-items:center;width:33px;height:33px;border-radius:50%;background:#dfe6ff;color:#3456e8;font-weight:700}.hero{background:linear-gradient(120deg,#1a2741,#31477c);border-radius:20px;padding:30px 34px;color:#fff;display:flex;justify-content:space-between;align-items:end;min-height:190px}.eyebrow{font-size:10px;letter-spacing:1.4px;font-weight:700;opacity:.66;margin:0 0 10px}.hero h1{font-size:30px;margin:0 0 9px;letter-spacing:-.7px}.hero-copy{margin:0;color:#d2daf0;font-size:13px}.room-meta{display:flex;gap:16px;align-items:center;color:#d2daf0;font-size:12px}.status-pill{background:#ffffff1a;padding:8px 12px;border-radius:18px;color:#fff;display:flex;gap:9px;align-items:center}.view-switch{margin:24px 0 18px;display:flex;gap:5px;background:#ebeff7;border-radius:10px;padding:4px;width:max-content}.switch{border:0;background:transparent;padding:9px 18px;border-radius:7px;color:var(--muted);font-weight:600;font-size:12px;cursor:pointer}.switch.active{background:#fff;color:var(--ink);box-shadow:0 2px 5px #1c2e6410}.view-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px}.main-column,.side-column{display:flex;flex-direction:column;gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:23px;box-shadow:0 3px 14px #21356706}.card-heading{display:flex;justify-content:space-between;align-items:start;gap:12px}.section-label{font-size:10px;letter-spacing:1.2px;text-transform:uppercase;color:var(--muted);font-weight:700}.card h2{font-size:18px;margin:7px 0 0;letter-spacing:-.3px}.new-badge{background:#fff0c8;color:#ad7800;border-radius:5px;padding:5px 7px;font-size:10px;font-weight:700}.prompt-text{background:#f7f8fb;border:1px solid #eceff5;border-radius:10px;margin:18px 0;padding:17px;white-space:pre-wrap;font:13px/1.75 'DM Sans','Noto Sans TC',sans-serif;color:#37435a}.primary,.outline,.ghost{border-radius:8px;padding:10px 15px;font-weight:600;font-size:12px;cursor:pointer}.primary{background:var(--primary);border:1px solid var(--primary);color:#fff}.primary:hover{background:var(--primary-dark)}.outline{background:#fff;border:1px solid #d9dfec;color:var(--ink)}.ghost{background:#f7f8fc;border:1px solid #edf0f6;color:var(--muted)}.prompt-actions{display:flex;align-items:center;gap:12px}.copy-message{font-size:11px;color:var(--mint-ink)}.interaction-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:17px}.interaction{display:grid;grid-template-columns:32px 1fr;grid-template-rows:1fr 1fr;text-align:left;column-gap:9px;background:#fafbfe;border:1px solid var(--line);border-radius:10px;padding:11px;color:var(--ink);cursor:pointer}.interaction span{grid-row:span 2;width:30px;height:30px;display:grid;place-items:center;background:var(--mint);color:var(--mint-ink);border-radius:8px;font-weight:700}.interaction:nth-child(2) span{background:var(--lav);color:var(--lav-ink)}.interaction b{font-size:12px;align-self:end}.interaction small{font-size:10px;color:var(--muted);align-self:start;margin-top:2px}.question-box{display:flex;gap:8px;margin-top:12px}.question-box textarea{flex:1;border:1px solid var(--line);border-radius:8px;padding:10px;font:12px inherit;resize:vertical;min-height:55px}.hidden{display:none!important}.announcement{font-size:13px;line-height:1.75;color:#556279;margin:17px 0 0}.muted{font-size:11px;color:var(--muted)}.count{font-size:11px;background:#edf1ff;color:#4c64cf;border-radius:20px;padding:5px 9px;font-weight:700}.resource-list{display:flex;flex-direction:column;gap:9px;margin:18px 0}.resource{display:flex;align-items:center;gap:11px;border:1px solid #edf0f5;border-radius:10px;padding:11px}.file-icon{width:32px;height:32px;display:grid;place-items:center;border-radius:8px;background:#eef1ff;color:#4660d7;font-size:14px}.file-icon.green{background:#e4f8ef;color:#168563}.file-icon.orange{background:#fff1df;color:#cb781e}.resource b{display:block;font-size:11px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:190px}.resource small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.download{margin-left:auto;color:#5770d9;text-decoration:none;font-size:12px}.full{width:100%;margin-top:5px}.compact{padding:14px}.qr-placeholder{height:145px;border:1px dashed #dce2ef;border-radius:10px;display:grid;place-content:center;text-align:center;gap:7px;color:var(--muted)}.qr-placeholder span{font-size:44px;line-height:1;color:#bcc6da}.qr-placeholder b{font-size:12px;color:var(--ink)}.qr-placeholder small{font-size:10px}.teacher-view{padding-bottom:35px}.teacher-toolbar{display:flex;justify-content:space-between;align-items:end;margin-bottom:18px}.teacher-toolbar h2{font-size:25px;margin:0 0 3px}.teacher-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.editor-card{display:flex;flex-direction:column;gap:10px}.editor-card input,.editor-card textarea,.upload-row input{border:1px solid var(--line);border-radius:8px;padding:11px;font:12px/1.6 inherit;color:var(--ink)}.editor-card input{font-weight:600;font-size:14px}.editor-card textarea{resize:vertical}.dropzone{border:1.5px dashed #cbd4e6;border-radius:11px;min-height:147px;display:grid;place-content:center;text-align:center;gap:7px;color:var(--muted);cursor:pointer;background:#fafbfe}.dropzone:hover{border-color:var(--primary);background:#f7f8ff}.dropzone span{font-size:30px;color:#8ea0d9}.dropzone b{font-size:12px;color:var(--ink)}.dropzone small,.helper{font-size:10px;color:var(--muted)}.upload-row{display:flex;gap:7px}.upload-row input{flex:1}.teacher-resources{margin-top:18px}footer{display:flex;justify-content:space-between;color:#9aa5ba;font-size:10px;padding:26px 0 35px}@media(max-width:760px){.shell{padding:0 16px}.topbar{height:68px}.hero{display:block;padding:25px 23px}.hero h1{font-size:23px}.room-meta{margin-top:22px}.view-grid,.teacher-grid{grid-template-columns:1fr}.side-column{display:grid;grid-template-columns:1fr 1fr}.teacher-toolbar{align-items:start;gap:10px}.teacher-toolbar .outline{white-space:nowrap}.interaction-row{grid-template-columns:1fr}.side-column .compact{display:none}footer{display:block;line-height:2}}
.room-picker{display:flex;align-items:center;gap:10px;margin:0 0 18px;padding:14px}.room-picker label{font-size:12px;font-weight:600}.room-picker select,.room-picker input{border:1px solid var(--line);border-radius:8px;padding:10px;font:12px inherit;color:var(--ink)}.room-picker select{flex:1}.room-picker input{width:190px}