:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}#root{min-height:100vh}.app{color:#1f2430;width:100vw;height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;display:flex;overflow:hidden}.sidebar{background:#f7f8fa;border-right:1px solid #e2e5ea;flex-shrink:0;width:220px;padding:16px 12px;overflow-y:auto}.sidebar-brand{margin-bottom:16px;padding:0 4px;font-size:15px;font-weight:700}.course-group{margin-bottom:18px}.course-title{text-transform:uppercase;letter-spacing:.04em;color:#8a92a3;padding:0 4px 6px;font-size:12px;font-weight:600}.file-list{margin:0;padding:0;list-style:none}.file-item{text-align:left;color:#333a45;cursor:pointer;background:0 0;border:none;border-left:3px solid #0000;border-radius:4px;width:100%;padding:7px 8px;font-size:13.5px}.file-item:hover{background:#edf0f4}.file-item.active{color:#1f4fb0;background:#e7f0ff;border-left-color:#2f6fed;font-weight:600}.document-viewer{flex:1;min-width:0;padding:24px 40px;overflow-y:auto}.document-viewer.empty{color:#8a92a3;justify-content:center;align-items:center;display:flex}.breadcrumb{color:#8a92a3;margin-bottom:12px;font-size:12px}.document-viewer h1{margin:0 0 20px;font-size:24px}.doc-section{margin-bottom:22px}.doc-section h2{color:#2f6fed;margin-bottom:8px;font-size:15px}.doc-section p{color:#333a45;margin:0 0 10px;font-size:14.5px;line-height:1.6}.chat-panel{background:#fff;border-left:1px solid #e2e5ea;flex-direction:column;flex-shrink:0;width:400px;display:flex}.chat-header{border-bottom:1px solid #e2e5ea;justify-content:space-between;align-items:center;gap:8px;padding:14px 16px;font-size:13.5px;display:flex}.chat-header-title strong{color:#2f6fed}.session-total{color:#276e3f;background:#f2f8f2;border-bottom:1px solid #e2e5ea;padding:8px 16px;font-size:12.5px}.message-list{flex-direction:column;flex:1;gap:14px;padding:16px;display:flex;overflow-y:auto}.empty-state{color:#8a92a3;text-align:center;margin-top:30px;font-size:13px}.msg{max-width:100%;font-size:13.8px;line-height:1.55}.msg-user{color:#fff;background:#2f6fed;border-radius:12px 12px 2px;align-self:flex-end;max-width:85%;padding:9px 13px}.msg-assistant{background:#f4f5f7;border-radius:12px 12px 12px 2px;align-self:flex-start;width:100%;padding:10px 13px}.cursor{color:#2f6fed;animation:1s step-start infinite blink;display:inline-block}@keyframes blink{50%{opacity:0}}.cost-panel{background:#fff;border:1px solid #e2e5ea;border-radius:8px;margin-top:10px;padding:10px 12px;font-size:12px}.cost-row{color:#5a6172;justify-content:space-between;gap:10px;padding:3px 0;display:flex}.model-badge{background:#eef1f6;border-radius:4px;padding:1px 6px;font-size:11.5px}.strike{color:#a3aab8;text-decoration:line-through}.cost-row.saved{color:#276e3f;border-top:1px dashed #e2e5ea;margin-top:4px;padding-top:6px;font-weight:600}.grounding-note{color:#9a6b1f;margin-top:6px;font-size:11.5px}.source-line{color:#8a92a3;margin-top:6px;font-size:11.5px}.chat-input-row{border-top:1px solid #e2e5ea;gap:8px;padding:12px 16px;display:flex}.chat-input-row input{border:1px solid #dadfe6;border-radius:20px;outline:none;flex:1;padding:9px 12px;font-size:13.5px}.chat-input-row input:focus{border-color:#2f6fed}.chat-input-row button{color:#fff;cursor:pointer;background:#2f6fed;border:none;border-radius:20px;padding:0 18px;font-size:13.5px}.chat-input-row button:disabled{cursor:default;background:#a9c1f7}