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/* 1.1: the conversation is the primary workspace. */
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@media(min-width:981px){.mobile-tabs{display:none}.desk>.panel{display:flex}.material-body{display:block;padding:0 16px 18px}.material-body>.section-label{display:flex}.composer-hint{display:inline}.materials-panel{grid-column:auto;min-height:0}.transcript-panel,.chat-panel{height:auto}.panel-heading{padding-left:16px;padding-right:16px}.capacity-wrap strong,.capacity-wrap small{font-size:.7rem}}
@media(max-width:1200px) and (min-width:981px){.chat-tools .capacity-wrap>div:last-child{display:none}.composer-hint{display:none}.chat-list{padding-left:24px;padding-right:24px}.chat-panel>.panel-heading{padding-left:20px;padding-right:20px}.chat-tools{gap:5px}.chat-tools>.quiet{padding:6px}}
@media(max-width:980px){.mobile-tabs{display:flex;margin:0 14px 10px;background:#e7edf8;padding:4px;border-radius:12px;gap:4px}.mobile-tabs button{flex:1;background:transparent;color:#61718e;padding:9px 4px;font-size:.875rem}.mobile-tabs button.active{background:#fff;color:var(--blue)}.desk,body:has(.notice:not([hidden])) .desk{display:block;padding:0 14px 14px;height:calc(100dvh - var(--workspace-top,250px) - 14px);min-height:460px}.desk>.column-resizer{display:none}.desk>.panel{height:100%;min-height:0;display:none}.desk>.panel.active{display:flex}.chat-panel>.panel-heading{padding:15px 16px}.chat-tools .capacity-wrap>div:last-child{display:none}#chat-expand{display:none}.chat-tools{gap:6px}.chat-list{padding:10px 20px 24px}.answer-text{font-size:1rem;line-height:1.9}.answer-body h1,.answer-body h2{font-size:1.15rem}.composer{padding:10px 12px}.composer-hint{display:none}.math-block{padding:12px;max-width:100%}.desk.chat-expanded .chat-list{padding-left:20px;padding-right:20px}.material-body{display:block}.material-body>.section-label{display:flex}.answer-body table{max-width:100%}}
/* 2.0: reserve the viewport for classroom reading. */
.topbar{height:54px;padding:0 24px}.topbar .brand{font-size:20px}.topbar .brand-mark{width:34px;height:34px;border-radius:10px;font-size:22px}.header-right{gap:12px}.header-right button{padding:7px 12px}.header-right .settings-icon{width:36px;height:36px;padding:0;font-size:24px;line-height:1}.coursebar{padding:10px 24px;gap:14px;min-height:62px}.course-heading>.eyebrow{display:none}.course-picker{gap:12px}.course-picker select{font-size:19px}.course-picker button,.course-actions button{padding:9px 13px}.course-actions{gap:10px}.course-actions .audio-tag{font-size:13px}.notice{padding:9px 14px;margin-bottom:8px}#settings-dialog select{display:block;width:100%;margin-top:8px;border:1px solid var(--line);border-radius:9px;padding:12px;background:#f8faff;color:inherit}
@media(max-width:780px){.topbar{height:50px;padding:0 14px}.topbar .brand{font-size:16px}.topbar .brand-mark{width:30px;height:30px;font-size:20px}.header-right{gap:8px}.coursebar{padding:8px 14px;display:flex;flex-wrap:wrap;gap:8px}.course-heading{flex:1;min-width:220px}.course-picker{justify-content:flex-start;gap:8px}.course-picker select{font-size:17px;max-width:calc(100% - 96px)}.course-picker button{padding:7px 10px;font-size:12px}.course-actions{margin:0;gap:8px;flex:1;justify-content:flex-end;min-width:260px}.course-actions .audio-tag{flex:0;margin-right:auto;font-size:12px}.course-actions button{padding:8px 11px;font-size:12px}.mobile-tabs{margin-top:4px;margin-bottom:8px}.mobile-tabs button{padding:8px 4px}.notice{margin-top:4px}.header-right .settings-icon{width:30px;height:30px;font-size:22px}}