/* Tristan AI — quiet hierarchy, warm space, sharp blue accents. */
#learn .tai-shell{display:grid;grid-template-columns:238px minmax(0,1fr);min-height:720px;background:#fff;border:1px solid #e3e9f2;border-radius:24px;overflow:hidden;box-shadow:0 16px 60px #132d5010}
#learn .tai-library{display:flex;flex-direction:column;background:#f8faff;border-right:1px solid #e6ecf5;padding:26px 18px;min-width:0}
.tai-library-top .eyebrow{font-size:9px;letter-spacing:1.5px;color:#52647c}.tai-new{display:flex;justify-content:space-between;align-items:center;width:100%;padding:13px 14px;border:1px solid #dce5f4;border-radius:12px;background:#fff;color:#233e6d;font-size:12px;font-weight:600;margin:16px 0 24px}.tai-new span{font-size:21px;font-weight:400;color:#0058ff}.tai-conversations{display:grid;align-content:start;gap:6px;max-height:580px;overflow:auto}.tai-chat{background:transparent;border:1px solid transparent;border-radius:11px;padding:12px;text-align:left;display:grid;gap:6px;min-width:0}.tai-chat>span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;font-weight:600;color:#536580}.tai-chat small{font-size:10px;color:#93a0b5}.tai-chat:hover{background:#edf3ff}.tai-chat.selected{background:#eaf1ff;border-color:#d8e5ff}.tai-chat.selected>span{color:#0058ff}.tai-no-history{font-size:12px;line-height:1.8;color:#52647c;padding:10px 12px}.tai-library-note{font-size:10px;line-height:1.8;color:#52647c;margin-top:auto;padding:32px 12px 4px}.tai-main{display:flex;flex-direction:column;min-width:0}.tai-toolbar{display:flex;align-items:center;gap:20px;padding:22px 30px;border-bottom:1px solid #edf0f6}.tai-identity{display:flex;gap:12px;align-items:center}.tai-avatar{display:grid;place-items:center;width:40px;height:40px;border-radius:13px;background:#eef4ff;color:#0058ff}.tai-avatar svg{width:27px;height:27px}.tai-identity h3{font-size:16px;margin:0 0 4px;letter-spacing:-.3px}.tai-identity>div>span{font-size:11px;color:#52647c}.tai-connection{display:flex;align-items:center;gap:7px;margin-left:auto;font-size:10px;white-space:nowrap;color:#52647c}.tai-connection:before,.tai-status-dot{content:'';display:block;width:6px;height:6px;border-radius:50%;background:#b4bfd0;flex:0 0 6px}.tai-connection.ready:before{background:#1dac8e;box-shadow:0 0 0 3px #20ad8e12}.tai-history-toggle{display:none}.tai-context{display:flex;gap:18px;align-items:end;padding:13px 30px;background:#fcfdff;border-bottom:1px solid #f0f3f8;flex-wrap:wrap}.tai-context label{margin:0;display:flex;align-items:center;gap:9px;font-size:10px;color:#52647c;font-weight:500}.tai-context select{width:auto;max-width:210px;font-size:11px;color:#385073;border:1px solid #e7ecf5;border-radius:8px;background:#fff;margin:0;padding:8px 24px 8px 10px}.tai-context .tai-notes-toggle{font-size:11px}.tai-notes-toggle input{width:auto;margin:0;accent-color:#0058ff}.tai-scroll{min-height:400px;max-height:580px;overflow-y:auto;overscroll-behavior:contain;scroll-behavior:smooth;padding:28px 40px}.tai-welcome{max-width:660px;margin:5px auto 12px;text-align:center}.tai-welcome-mark{color:#0058ff;display:grid;place-items:center;margin:0 auto 20px;width:52px;height:52px;background:linear-gradient(140deg,#e6efff,#f7faff);border:1px solid #e0ebff;border-radius:17px}.tai-welcome-mark svg{height:33px;width:33px}.tai-welcome .eyebrow{font-size:9px;letter-spacing:2px;color:#52647c}.tai-welcome h2{font-size:46px;font-weight:550;letter-spacing:-2px;line-height:1.02;margin:18px 0;color:#102441}.tai-welcome h2 em{font-style:normal;color:#0058ff}.tai-intro{max-width:430px;margin:0 auto;color:#52647c;font-size:12px;line-height:1.8}.tai-prompt-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:26px 0 22px;text-align:left}.tai-prompt{padding:17px;border:1px solid #e4ebf6;border-radius:13px;background:#fff;text-align:left;transition:background .16s,border-color .16s,transform .16s}.tai-prompt:hover{border-color:#b2ccff;background:#f8fbff;transform:translateY(-2px)}.tai-prompt>span{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:12px;font-weight:650;color:#365279}.tai-prompt b{font-size:16px;font-weight:400;color:#91acd1}.tai-prompt small{display:block;color:#52647c;font-size:10px;line-height:1.5;margin-top:7px}.tai-knowledge{display:flex;align-items:center;text-align:left;gap:13px;padding:14px 16px;border-radius:12px;background:#f5f8fe;border:1px solid #edf2fa}.tai-knowledge-icon{width:29px;color:#7a9ccb;flex-shrink:0}.tai-knowledge-icon svg{width:27px;height:27px}.tai-knowledge b{font-size:11px;color:#547096;font-weight:600}.tai-knowledge p{font-size:10px;color:#52647c;margin:5px 0}.tai-knowledge small{font-size:9px;color:#52647c}.tai-setup{display:flex;gap:10px;text-align:left;align-items:start;padding:17px 5px 0}.tai-setup .tai-status-dot{margin-top:5px;background:#c6a45b}.tai-setup b{font-size:11px;color:#6b7591;font-weight:500}.tai-setup p{font-size:10px;line-height:1.7;color:#52647c;margin:5px 0 0}.tai-compose-wrap{margin-top:auto;padding:12px 30px 0}.tai-composer{border:1px solid #dae5f5;background:#fff;border-radius:17px;box-shadow:0 5px 23px #1751aa09;transition:border-color .15s,box-shadow .15s}.tai-composer:focus-within{border-color:#83adff;box-shadow:0 0 0 3px #0058ff09}.tai-composer textarea{width:100%;margin:0;min-height:72px;padding:17px 18px 5px;border:0;background:none;resize:none;box-shadow:none;outline:none;font-size:12px;line-height:1.7;color:#294362;border-radius:17px}.tai-composer textarea::placeholder{color:#a0abc0}.tai-compose-bottom{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:7px 12px 10px 18px}.tai-compose-bottom>span{font-size:9px;color:#52647c;line-height:1.5}.tai-send{display:grid;place-items:center;border:0;border-radius:12px;background:#0058ff;color:#fff;width:37px;height:37px;flex-shrink:0;box-shadow:0 4px 12px #0058ff26}.tai-send:hover{background:#004be0}.tai-send svg{height:20px;width:20px}.tai-caption{font-size:9px;letter-spacing:.2px;text-align:center;color:#52647c;margin:12px 0 16px}.tai-notice{font-size:11px;line-height:1.7;background:#f1f6ff;color:#537299;border:1px solid #e2ebfa;border-radius:11px;padding:12px 15px;margin-bottom:12px}.tai-notice.error{background:#fff7ee;border-color:#f8e7d1;color:#8b6c48}.tai-messages{display:grid;gap:26px;max-width:740px;margin:auto}.tai-message{min-width:0}.tai-message-label{display:flex;gap:7px;align-items:center;font-size:10px;font-weight:600;color:#7188a8;margin-bottom:9px}.tai-message-label svg{width:18px;height:18px;color:#0058ff}.tai-message-text{font-size:13px;line-height:1.95;color:#425875;overflow-wrap:anywhere}.tai-user{margin-left:40px;padding:15px 20px;border:1px solid #e7eefb;border-radius:15px 15px 3px 15px;background:#f3f7ff}.tai-user .tai-message-text{font-size:12px;color:#4a6081}.tai-saved{display:block;font-size:10px;color:#899bb8;margin-top:12px}.tai-sources{margin-top:14px;border-top:1px solid #e8eef7;padding-top:10px}.tai-sources summary{font-size:10px;color:#5e80b1;cursor:pointer}.tai-sources>div{display:grid;gap:10px;margin-top:13px}.tai-source{display:flex;gap:9px}.tai-source>span{font-size:9px;padding:4px 5px;height:20px;background:#eef4ff;border-radius:5px;color:#4275b9}.tai-source b{font-size:10px;font-weight:550;color:#697f9e}.tai-source small{font-size:9px;display:block;color:#52647c;margin-top:3px;line-height:1.6}.tai-thinking{display:flex;gap:5px;align-items:center;color:#95a5be;margin:8px 0}.tai-thinking>span{width:4px;height:4px;border-radius:50%;background:#0058ff;animation:tai-pulse 1.2s infinite}.tai-thinking>span:nth-child(2){animation-delay:.2s}.tai-thinking>span:nth-child(3){animation-delay:.4s}.tai-thinking b{font-size:10px;font-weight:400;margin-left:8px}@keyframes tai-pulse{50%{opacity:.2;transform:translateY(-2px)}}
@media(max-width:1250px){#learn .tai-shell{grid-template-columns:195px minmax(0,1fr)}.tai-toolbar{padding:20px}.tai-context{padding:12px 20px;gap:12px}.tai-scroll{padding:25px}.tai-compose-wrap{padding:12px 20px 0}.tai-welcome h2{font-size:40px}.tai-prompt{padding:14px}}
@media(max-width:1000px){#learn .tai-shell{grid-template-columns:1fr;min-height:740px}#learn .tai-library{display:none}#learn.tai-history-open .tai-library{display:flex;border-right:0;border-bottom:1px solid #e5edf7;padding:16px 20px;order:0;max-height:280px}.tai-library-top .eyebrow,.tai-library-note{display:none}.tai-new{margin:0 0 10px}.tai-main{order:1}.tai-toolbar{gap:10px}.tai-history-toggle{display:block;margin-left:auto;font-size:10px;border:1px solid #e3eaf5;background:#fff;color:#52647c;padding:8px;border-radius:8px}.tai-connection{margin-left:0}.tai-conversations{display:grid;grid-template-columns:1fr 1fr;gap:6px}.tai-library-top{max-width:220px}}
@media(max-width:600px){#learn .tai-shell{border-radius:19px;min-height:calc(100dvh - 200px)}.tai-toolbar{padding:17px 16px;flex-wrap:wrap}.tai-identity>div>span{font-size:9px}.tai-identity h3{font-size:15px}.tai-avatar{width:35px;height:35px;border-radius:11px}.tai-connection{font-size:9px}.tai-identity{gap:8px}.tai-history-toggle{font-size:9px}.tai-context{padding:12px 16px;gap:8px 13px}.tai-context label{font-size:9px;gap:5px}.tai-context select{font-size:10px;max-width:175px;padding:7px}.tai-scroll{max-height:none;min-height:360px;padding:20px 17px}.tai-welcome{margin:0 auto}.tai-welcome h2{font-size:38px;letter-spacing:-1.5px}.tai-welcome .eyebrow{font-size:8px;letter-spacing:1.1px}.tai-intro{font-size:11px}.tai-prompt-grid{gap:8px;margin-top:22px}.tai-prompt{padding:13px}.tai-prompt>span{font-size:11px;gap:5px}.tai-prompt small{font-size:9px}.tai-knowledge{padding:13px 10px;gap:9px}.tai-knowledge p{font-size:9px;line-height:1.6}.tai-knowledge small{font-size:8px;line-height:1.6;display:block}.tai-compose-wrap{padding:6px 12px 0}.tai-composer textarea{font-size:16px;min-height:80px;padding:15px 14px 5px}.tai-compose-bottom{padding-left:14px}.tai-compose-bottom>span{font-size:8px}.tai-message-text{font-size:12px}.tai-user{margin-left:14px;padding:14px}.tai-caption{font-size:8px}.tai-conversations{grid-template-columns:1fr}.tai-setup p{font-size:9px}.tai-notice{font-size:10px}.tai-history-open .tai-scroll{min-height:280px}}
@media(prefers-reduced-motion:reduce){.tai-thinking>span{animation:none}.tai-prompt{transition:none}.tai-scroll{scroll-behavior:auto}}