:root{color:#173f55;font-synthesis:none;letter-spacing:0;--ink:#173f55;--muted:#607781;--paper:#fffdf8;--surface:#fff;--canvas:#edf2f3;--line:#cad8dc;--teal:#087e7a;--teal-dark:#066662;--blue:#267aa2;--orange:#d9772d;--yellow:#f2c14e;background:#edf2f3;font-family:Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#root{width:100%;min-width:320px;min-height:100%;margin:0}body{min-height:100dvh;overflow-x:hidden}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}button:focus-visible,textarea:focus-visible,input:focus-visible,iframe:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.login-page{background:var(--paper);grid-template-columns:minmax(420px,1.12fr) minmax(420px,.88fr);min-height:100dvh;display:grid}.login-intro{color:#fff;border-right:10px solid var(--yellow);background:#164d59;flex-direction:column;justify-content:center;min-height:100dvh;padding:clamp(48px,7vw,110px);display:flex}.brand-mark{background:#fff;border:4px solid #fff;border-radius:50%;place-items:center;width:112px;height:112px;margin-bottom:30px;display:grid;overflow:hidden;box-shadow:0 12px 30px #081f2738}.brand-mark img{aspect-ratio:1;object-fit:cover;width:145%;max-width:none;height:auto;transform:translateY(10%)}.login-intro .eyebrow{color:#bfe4df;margin:0 0 14px;font-size:15px;font-weight:700}.login-intro h1{max-width:720px;margin:0;font-size:clamp(42px,5vw,76px);font-weight:780;line-height:1.12}.login-subtitle{color:#dbeceb;margin:22px 0 0;font-size:clamp(20px,2vw,28px)}.login-panel{place-self:center;gap:24px;width:min(430px,100% - 64px);display:grid}.section-kicker{color:var(--teal);margin:0 0 6px;font-size:13px;font-weight:800}.login-panel h2{margin:0;font-size:30px}.login-form{gap:17px;display:grid}.login-form label{color:var(--ink);gap:7px;font-size:14px;font-weight:700;display:grid}.login-form input{border:1px solid var(--line);width:100%;min-height:46px;color:var(--ink);background:#fff;border-radius:6px;padding:0 13px}.login-form input:focus{border-color:var(--teal)}.form-error{color:#a43f35;margin:-5px 0 0;font-size:13px}.login-help{text-align:center;color:#788b92;margin:-10px 0 0;font-size:12px}.session-loading,.admin-placeholder{place-items:center;min-height:100dvh;display:grid}.segmented{border:1px solid var(--line);background:#eff4f4;border-radius:7px;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px;padding:4px;display:grid}.segmented button,.teacher-controls button{min-height:42px;color:var(--muted);background:0 0;border:1px solid #0000;border-radius:5px;justify-content:center;align-items:center;gap:8px;font-weight:700;display:inline-flex}.segmented button.active{color:var(--ink);background:#fff;border-color:#bdcdd2;box-shadow:0 2px 8px #254b5514}.identity-preview{border:1px solid var(--line);background:#fff;border-radius:7px;align-items:center;gap:15px;min-height:80px;padding:15px 17px;display:flex}.identity-preview .avatar{width:47px;height:47px;color:var(--teal-dark);background:#dcedeb;border-radius:50%;flex:none;place-items:center;font-size:20px;font-weight:800;display:grid}.identity-preview div{gap:4px;display:grid}.identity-preview strong{font-size:17px}.identity-preview span:last-child{color:var(--muted);font-size:13px}.primary-command{border:1px solid var(--teal);background:var(--teal);color:#fff;border-radius:6px;justify-content:center;align-items:center;gap:9px;min-height:48px;font-weight:750;display:inline-flex}.primary-command:hover{background:var(--teal-dark)}.demo-notice{text-align:center;color:#788b92;margin:-10px 0 0;font-size:12px}.app-shell{background:var(--canvas);grid-template-rows:64px minmax(0,1fr);height:100dvh;min-height:680px;display:grid;overflow:hidden}.app-header{border-bottom:1px solid var(--line);background:#fff;justify-content:space-between;align-items:center;gap:24px;padding:0 22px;display:flex}.app-brand,.header-status,.app-brand>div{align-items:center;display:flex}.app-brand{gap:12px;min-width:0}.app-brand>div{align-items:baseline;gap:12px;min-width:0}.app-brand strong{white-space:nowrap;font-size:18px}.app-brand>div>span{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;font-size:13px;overflow:hidden}.brand-logo{background:#fff;border:1px solid #d7e3e3;border-radius:50%;flex:none;place-items:center;width:34px;height:34px;display:grid;overflow:hidden}.brand-logo img{aspect-ratio:1;object-fit:cover;width:145%;max-width:none;height:auto;transform:translateY(10%)}.header-status{flex:none;gap:10px}.role-badge,.connection-state,.current-user{white-space:nowrap;border-radius:5px;align-items:center;gap:6px;min-height:30px;padding:0 10px;font-size:13px;display:inline-flex}.role-badge{color:#075f5c;background:#d8ecea;font-weight:700}.role-teacher{color:#6b431d;background:#f5e7d5}.connection-state{color:#346342;background:#e3efe6}.current-user{color:var(--ink);background:#edf2f3;font-weight:700}.icon-button,.send-button{border:1px solid var(--line);width:38px;height:38px;color:var(--ink);background:#fff;border-radius:6px;flex:none;place-items:center;padding:0;display:inline-grid}.icon-button:hover,.send-button:hover:not(:disabled){border-color:var(--teal);color:var(--teal)}.classroom-toolbar{border-bottom:1px solid var(--line);background:#f9fbfb;justify-content:space-between;align-items:center;gap:16px;min-height:54px;padding:6px 22px;display:flex}.teacher-controls{align-items:center;gap:4px;display:flex}.teacher-controls button{min-height:38px;padding:0 13px}.teacher-controls button.active{color:#fff;background:var(--ink)}.toolbar-note{color:var(--muted);font-size:13px}.toolbar-meta{align-items:center;gap:12px;display:flex}.overview-toggle{border:1px solid var(--line);min-height:36px;color:var(--muted);background:#fff;border-radius:5px;align-items:center;gap:7px;padding:0 11px;font-weight:700;display:inline-flex}.overview-toggle.active{color:var(--teal-dark);background:#e3f1ef;border-color:#9ec4c1}.lesson-workspace{min-height:0;padding:12px}.chat-workspace{background:#fff;grid-template-columns:280px minmax(0,1fr);min-height:0;display:grid}.chat-main{min-width:0;min-height:0;position:relative;overflow:hidden}.chat-loading{height:100%;color:var(--muted);place-items:center;display:grid}.chat-error{z-index:5;color:#84372f;background:#fff6f4;border:1px solid #e0b0aa;border-radius:6px;max-width:min(560px,100% - 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440px)}.assistant-drawer.standalone .assistant-messages{padding:36px max(20px,50% - 440px) 20px}.assistant-drawer.standalone .message-student p{width:fit-content;max-width:80%;margin-left:auto}.assistant-drawer.standalone .quick-questions,.assistant-drawer.standalone .assistant-compose{width:min(880px,100% - 40px);margin-inline:auto}.assistant-drawer.standalone .quick-questions{grid-template-columns:repeat(4,minmax(0,1fr));padding-inline:0;display:grid}.assistant-drawer.standalone .quick-questions button{border-radius:6px;justify-content:center;min-height:42px}.assistant-drawer.standalone .assistant-compose{margin-bottom:22px}.assistant-header{border-bottom:1px solid #edf0f1;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:9px;min-height:76px;padding:12px 16px;display:grid}.assistant-symbol{background:#fff;border:1px solid #e3e9e9;border-radius:50%;place-items:center;width:42px;height:42px;display:grid;overflow:hidden}.assistant-symbol img{aspect-ratio:1;object-fit:cover;width:145%;max-width:none;height:auto;transform:translateY(10%)}.assistant-header>div{gap:3px;min-width:0;display:grid}.assistant-header strong{font-size:16px}.assistant-header span:not(.assistant-symbol){color:var(--muted);text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.assistant-messages{background:#fff;flex-direction:column;gap:22px;min-height:0;padding:22px 20px 16px;display:flex;overflow-y:auto}.message{max-width:100%}.message p{overflow-wrap:anywhere;margin:0;font-size:15px;line-height:1.7}.message-assistant{color:#273d45;align-self:flex-start}.message-assistant p{background:0 0;border:0;padding:0}.message-student{align-self:flex-end;max-width:88%}.message-student p{color:#28424b;background:#edf3f3;border-radius:16px 16px 4px;padding:11px 14px}.message-pending p{color:#6b858c}.message-error{color:#8b4038;align-items:center;gap:10px;display:flex}.message-error button{color:#84372f;white-space:nowrap;background:#fff8f6;border:1px solid #d9aaa4;border-radius:5px;align-items:center;gap:5px;min-height:32px;padding:0 10px;display:inline-flex}.quick-questions{background:#fff;flex-wrap:wrap;gap:7px;padding:10px 16px 12px;display:flex}.quick-questions button{color:#4e6970;background:#f7f9f9;border:1px solid #e2e9e9;border-radius:18px;align-items:center;gap:5px;min-height:34px;padding:0 11px;font-size:12px;display:inline-flex}.quick-questions button:hover:not(:disabled){border-color:var(--orange);color:#a9531c}.assistant-compose{background:#f7f9f9;border:1px solid #dae4e4;border-radius:18px;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:8px;margin:0 14px 14px;padding:8px 8px 8px 14px;transition:border-color .16s;display:grid}.assistant-compose:focus-within{border-color:#84b6b3}.assistant-compose textarea{resize:none;width:100%;min-height:40px;max-height:140px;color:var(--ink);background:0 0;border:0;border-radius:0;padding:8px 0;line-height:1.45}.assistant-compose textarea:focus-visible{outline:none}.assistant-compose textarea:disabled{background:0 0}.send-button{color:#fff;background:var(--teal);border-color:var(--teal);border-radius:50%;place-items:center;width:38px;height:38px;padding:0;display:grid}.teacher-overview{flex-direction:column;padding:18px;display:flex;overflow-y:auto}.teacher-overview>header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-start;gap:10px;padding-bottom:16px;display:flex}.teacher-overview header p,.teacher-overview header h2{margin:0}.teacher-overview header p{color:var(--teal);margin-bottom:4px;font-size:12px;font-weight:750}.teacher-overview header h2{font-size:22px}.teacher-overview header>span{color:var(--muted);font-size:12px}.overview-metrics{border-bottom:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.overview-metric{border-right:1px solid var(--line);border-bottom:1px solid var(--line);flex-direction:column;justify-content:center;gap:8px;min-height:105px;padding:15px 10px;display:flex}.overview-metric:nth-child(2n){border-right:0}.overview-metric span{color:var(--muted);align-items:center;gap:6px;font-size:12px;display:flex}.overview-metric strong{font-size:26px}.overview-note{padding-top:18px}.overview-note h3{margin:0 0 8px;font-size:14px}.overview-note p{color:var(--muted);margin:0;font-size:13px;line-height:1.6}@media (width<=1100px){.learning-layout.teacher.with-overview{grid-template-columns:minmax(0,1fr) 286px}.learning-layout.student:has(.assistant-drawer){grid-template-columns:minmax(0,1fr)}.assistant-drawer{z-index:30;width:min(390px,100vw - 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14px);position:fixed;top:125px;bottom:7px;right:7px;box-shadow:0 14px 40px #1c3f4838}.assistant-drawer.standalone .quick-questions{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=520px){.app-shell{grid-template-rows:58px minmax(0,1fr)}.app-brand strong{font-size:15px}.brand-logo{width:30px;height:30px}.role-badge{text-overflow:ellipsis;max-width:86px;overflow:hidden}.header-status{gap:6px}.admin-shell{grid-template-rows:58px minmax(0,1fr)}.admin-toolbar{flex-direction:column;align-items:stretch}.admin-toolbar .primary-command{width:100%}.admin-toolbar h1{font-size:26px}.conversation-sidebar{top:58px}.assistant-launcher-wrap{width:76px;height:76px;bottom:92px;right:14px}.assistant-tuck-button{top:44px}.assistant-side-tab{bottom:94px}.assistant-drawer{width:auto;inset:64px 6px 6px}.assistant-drawer.standalone{width:100%;position:static;inset:auto}.assistant-drawer.standalone .assistant-header{padding-inline:14px}.assistant-drawer.standalone .assistant-messages{padding:24px 16px 14px}.assistant-drawer.standalone .quick-questions{grid-template-columns:1fr;width:calc(100% - 24px)}.assistant-drawer.standalone .assistant-compose{width:calc(100% - 24px);margin-bottom:12px}}@media (prefers-reduced-motion:reduce){.assistant-launcher-wrap,.assistant-launcher img,.assistant-side-tab{animation:none}.assistant-launcher,.assistant-tuck-button,.assistant-side-tab{transition:none}}