.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.tutor-heading{margin-bottom:22px}.tutor-heading h1{font-size:clamp(27px,2.5vw,34px);letter-spacing:-.8px;font-weight:700}.tutor-heading p{color:var(--muted);font-size:calc(13px * var(--font-scale,1));line-height:1.8;margin-top:8px}.tutor-workspace{height:calc(100dvh - 220px);min-height:520px;display:grid;grid-template-columns:minmax(0,1fr);border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--panel);position:relative}.tutor-workspace.history-open{grid-template-columns:215px minmax(0,1fr)}.tutor-history{padding:21px 13px 16px;background:var(--panel2);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}.tutor-history[hidden]{display:none}.tutor-history-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 6px 20px}.tutor-history-title h2{font-size:calc(12px * var(--font-scale,1));letter-spacing:0;font-weight:650;color:var(--muted)}.tutor-history-close{display:none}.tutor-chat-list{flex:1;min-height:0;overflow:auto;scrollbar-width:thin}.tutor-chat-row{display:flex;align-items:center;gap:4px;border:1px solid transparent;border-radius:7px;margin-bottom:5px}.tutor-chat-row.active{background:var(--accent-soft)}.tutor-chat-row>button:first-child{flex:1;min-width:0;padding:11px 10px;text-align:left;min-height:41px}.tutor-chat-row strong{display:block;font-size:calc(12px * var(--font-scale,1));font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.tutor-chat-row.active strong{font-weight:650;color:var(--accent)}.tutor-chat-row>.icon-button{width:28px;height:28px;flex:none;opacity:0}.tutor-chat-row:hover>.icon-button,.tutor-chat-row:focus-within>.icon-button{opacity:1}.tutor-history-empty{font-size:calc(12px * var(--font-scale,1));color:var(--muted);line-height:1.9;padding:10px 7px}.tutor-history-note{padding:16px 7px 0;margin-top:15px;border-top:1px solid var(--line);font-size:calc(10px * var(--font-scale,1));color:var(--muted);line-height:1.8}.tutor-chat{display:flex;flex-direction:column;min-width:0;min-height:0}.tutor-chat-toolbar{display:flex;align-items:center;gap:12px;padding:14px 22px;border-bottom:1px solid var(--line);min-height:63px;flex:none}.tutor-chat-toolbar h2{font-size:calc(13px * var(--font-scale,1));letter-spacing:0;font-weight:550;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;flex:1}.tutor-chat-toolbar .btn{font-size:calc(11px * var(--font-scale,1));flex:none;min-height:34px;border-radius:7px;background:var(--panel);border:1px solid var(--line);color:var(--text);box-shadow:none}.tutor-chat-toolbar .btn:hover{background:var(--panel2)}.tutor-history-toggle{display:none}.tutor-scroll{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;padding:27px clamp(20px,4vw,56px)}.tutor-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:-3px}.tutor-welcome{max-width:540px;text-align:left;margin:clamp(18px,5vh,55px) auto 25px}.tutor-welcome h2{font-size:clamp(22px,2.2vw,28px);letter-spacing:-.6px;font-weight:650;line-height:1.4}.tutor-welcome>p{font-size:calc(13px * var(--font-scale,1));color:var(--muted);line-height:1.9;margin:13px 0 26px}.tutor-starters{display:grid;grid-template-columns:1fr 1fr;gap:10px}.tutor-starters button{display:flex;align-items:center;gap:10px;padding:15px 13px;min-height:59px;text-align:left;border:1px solid var(--line);border-radius:8px;background:var(--panel);font-size:calc(12px * var(--font-scale,1));line-height:1.7;font-weight:500}.tutor-starters button:hover{background:var(--panel2);border-color:var(--input-line)}.tutor-starters .icon{width:17px;height:17px;color:var(--muted)}.tutor-context{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:0 8px 8px 0;background:var(--panel2);padding:15px 18px;margin-bottom:27px;font-size:calc(13px * var(--font-scale,1));line-height:1.8}.tutor-context>div{display:flex;align-items:center;gap:8px;font-size:calc(11px * var(--font-scale,1));color:var(--muted)}.tutor-context p{margin-top:9px}.tutor-context small{display:block;font-size:calc(12px * var(--font-scale,1));color:var(--muted);margin-top:8px}.tutor-context button{display:block;margin-top:10px;font-size:calc(12px * var(--font-scale,1))}.tutor-message{max-width:760px;margin:0 auto 29px}.tutor-message-label{display:flex;gap:7px;align-items:center;color:var(--muted);font-size:calc(11px * var(--font-scale,1));font-weight:650;margin-bottom:10px}.tutor-message-label .icon{width:15px;height:15px}.tutor-message.student{display:flex;flex-direction:column;align-items:flex-end}.tutor-bubble{max-width:90%;border:1px solid var(--line);border-radius:11px 11px 3px 11px;background:var(--panel2);padding:13px 17px;line-height:1.85;font-size:calc(14px * var(--font-scale,1));overflow-wrap:anywhere}.tutor-markdown{font-size:calc(14px * var(--font-scale,1));line-height:1.9;overflow-wrap:anywhere}.tutor-markdown p{margin:0 0 13px}.tutor-markdown ul,.tutor-markdown ol{padding-left:24px;margin:10px 0 15px}.tutor-markdown li+li{margin-top:7px}.tutor-markdown :is(h1,h2,h3){font-size:calc(18px * var(--font-scale,1));letter-spacing:-.3px;margin:19px 0 9px}.tutor-markdown code{background:var(--panel2);border-radius:4px;padding:2px 4px;font-size:calc(12px * var(--font-scale,1))}.tutor-markdown pre{overflow:auto;background:var(--panel2);padding:15px;border-radius:7px}.tutor-markdown blockquote{border-left:3px solid var(--line);margin:13px 0;padding:8px 16px;color:var(--muted)}.tutor-markdown table{display:block;overflow:auto;border-collapse:collapse}.tutor-markdown th,.tutor-markdown td{padding:9px 13px;border:1px solid var(--line)}.tutor-copy{font-size:calc(10px * var(--font-scale,1));color:var(--muted);margin-top:9px}.tutor-generating{margin-left:auto;font-weight:400;font-size:calc(10px * var(--font-scale,1));color:var(--muted)}/* Northstar constellation: animate only while waiting for the first answer text. */
.tutor-thinking{display:flex;align-items:center;gap:12px;min-height:46px;padding:5px 0;color:var(--accent)}
.tutor-thinking-mark{position:relative;display:grid;place-items:center;flex:none;width:44px;height:44px}
.tutor-thinking-star{width:22px;height:22px;overflow:visible;fill:currentColor;animation:tutor-star-breathe 2.8s ease-in-out infinite}
.tutor-thinking-rays{opacity:.28}.tutor-thinking-core{fill:var(--panel)}
.tutor-thinking-orbit{position:absolute;inset:0;display:block;width:100%;height:100%;overflow:visible;fill:none;transform-origin:50% 50%;animation:tutor-star-orbit 1.8s linear infinite}
.tutor-thinking-track{stroke:var(--line);stroke-width:1}
.tutor-thinking-trail{stroke:currentColor;stroke-width:2.5;stroke-linecap:round}
.tutor-thinking-satellite{fill:currentColor}
.tutor-thinking-label{color:var(--muted);font-size:calc(12px * var(--font-scale,1));font-weight:500;letter-spacing:.05px}
@keyframes tutor-star-breathe{0%,100%{transform:scale(.86) rotate(-8deg);opacity:.68}50%{transform:scale(1.06) rotate(8deg);opacity:1}}
@keyframes tutor-star-orbit{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
.tutor-quick{display:flex;gap:7px;overflow:auto;padding:8px 22px 0;scrollbar-width:thin;flex:none}.tutor-quick button{white-space:nowrap;border:1px solid var(--line);border-radius:7px;padding:7px 10px;font-size:calc(10px * var(--font-scale,1));background:var(--panel);min-height:31px}.tutor-quick button:hover{background:var(--panel2)}.tutor-error{margin:10px 22px 0;padding:11px 14px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);font-size:calc(12px * var(--font-scale,1));line-height:1.8;flex:none}.tutor-error button{font-size:calc(12px * var(--font-scale,1));text-decoration:underline;margin-left:10px}.tutor-composer{border:1px solid var(--input-line);border-radius:10px;margin:15px 22px 0;padding:13px 15px;background:var(--panel);flex:none}.tutor-composer:focus-within{border-color:var(--accent);outline:1px solid var(--accent);outline-offset:0}.tutor-composer textarea{display:block;width:100%;min-height:52px;max-height:140px;resize:none;border:0;outline:0;background:transparent;color:var(--text);font:inherit;font-size:calc(13px * var(--font-scale,1));line-height:1.8}.tutor-composer textarea:focus{outline:0}.tutor-composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px}.tutor-composer-bottom>span{color:var(--muted);font-size:calc(10px * var(--font-scale,1))}.tutor-composer-bottom .btn{font-size:calc(11px * var(--font-scale,1));border-radius:7px;min-height:35px}.tutor-disclaimer{font-size:calc(10px * var(--font-scale,1));line-height:1.8;text-align:center;color:var(--muted);padding:9px 14px 12px;flex:none}.tutor-history-scrim{display:none}.tutor-loading,.tutor-pending-status{text-align:center;color:var(--muted);font-size:calc(12px * var(--font-scale,1));padding:30px 0;line-height:1.8}.tutor-markdown .katex-display{max-width:100%;overflow:auto;padding:8px 0}.tutor-markdown .katex{font-size:1.15em}.tutor-consent{padding:18px 20px;background:var(--panel2);border:1px solid var(--line);border-radius:8px;margin:10px 22px 0;flex:none;max-height:260px;overflow:auto}.tutor-consent h2{font-size:calc(15px * var(--font-scale,1));margin-bottom:10px}.tutor-consent p{font-size:calc(11px * var(--font-scale,1));line-height:1.9;color:var(--muted)}.tutor-consent label{display:flex;gap:9px;align-items:flex-start;font-size:calc(11px * var(--font-scale,1));line-height:1.8;margin:13px 0}.tutor-consent input{flex:none;margin-top:3px}.tutor-consent>.btn{margin-top:3px}.tutor-privacy-link{font-size:calc(11px * var(--font-scale,1));margin-left:14px}
@media(max-width:1100px){.tutor-workspace.history-open{grid-template-columns:185px minmax(0,1fr)}.tutor-scroll{padding:23px}.tutor-chat-toolbar{padding-inline:19px}}
@media(max-width:899px){.tutor-workspace.history-open{grid-template-columns:minmax(0,1fr)}.tutor-history{position:absolute;inset:0 auto 0 0;z-index:5;width:min(285px,85%);border-radius:11px 0 0 11px;box-shadow:9px 0 25px #08153022}.tutor-history-close,.tutor-history-toggle{display:inline-flex;align-items:center;justify-content:center}.tutor-history-close{width:29px;height:29px}.history-open .tutor-history-scrim{display:block;position:absolute;inset:0;z-index:4;background:#08153055}.tutor-chat-row>.icon-button{opacity:1}}
@media(max-width:700px){.tutor-heading{margin-bottom:17px}.tutor-heading h1{font-size:calc(27px * var(--font-scale,1))}.tutor-heading p{font-size:calc(12px * var(--font-scale,1))}.tutor-workspace{height:calc(100dvh - 195px);min-height:460px;border-radius:10px}.tutor-chat-toolbar{gap:9px;padding:11px 13px;min-height:57px}.tutor-chat-toolbar h2{font-size:calc(12px * var(--font-scale,1))}.tutor-chat-toolbar .btn{font-size:calc(10px * var(--font-scale,1));padding:8px 10px}.tutor-scroll{padding:20px 17px}.tutor-welcome{margin-top:25px}.tutor-welcome h2{font-size:calc(23px * var(--font-scale,1))}.tutor-welcome>p{font-size:calc(12px * var(--font-scale,1))}.tutor-starters{gap:8px}.tutor-starters button{font-size:calc(11px * var(--font-scale,1));padding:12px 10px;gap:8px}.tutor-starters .icon{width:15px;height:15px}.tutor-composer{margin:12px 13px 0;padding:11px 12px}.tutor-composer textarea{font-size:calc(13px * var(--font-scale,1))}.tutor-quick{padding-inline:13px}.tutor-error,.tutor-consent{margin-inline:13px}.tutor-consent{max-height:230px;padding:15px}.tutor-consent>.btn{display:block}.tutor-privacy-link{display:inline-block;margin:12px 0 0}.tutor-bubble,.tutor-markdown{font-size:calc(13px * var(--font-scale,1))}.tutor-context{padding:13px;font-size:calc(12px * var(--font-scale,1))}.tutor-disclaimer{font-size:calc(9px * var(--font-scale,1))}.tutor-generating{font-size:calc(9px * var(--font-scale,1))}}
@media(max-width:390px){.tutor-starters{grid-template-columns:minmax(0,1fr)}.tutor-starters button{min-height:44px}.tutor-chat-toolbar h2{font-size:calc(11px * var(--font-scale,1))}}
@media(prefers-reduced-motion:reduce){.tutor-thinking-star,.tutor-thinking-orbit{animation:none;transform:none;opacity:1}}
body.reduce-motion :is(.tutor-thinking-star,.tutor-thinking-orbit){animation:none;transform:none;opacity:1}
body.high-contrast .tutor-thinking,body.high-contrast .tutor-thinking-label{color:var(--text)}
@media(forced-colors:active){.tutor-thinking{color:CanvasText}.tutor-thinking-track{stroke:CanvasText;opacity:.35}.tutor-thinking-core{fill:Canvas}.tutor-thinking-label{color:CanvasText}}