:root{--bg-color:#faf9f7;--sidebar-bg:#f0ede8;--text-color:#1c1b18;--border-color:#2b2a27;--accent-color:#8b0000;--input-bg:#fff;--muted:#1c1b1873;--hover-bg:#1c1b180a;--active-bg:#1c1b1812}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:Libre Baskerville,Georgia,Times New Roman,serif;font-size:17px;line-height:1.65}.centered-layout{justify-content:center;align-items:center;min-height:100vh;padding:3rem 1.5rem;display:flex}.sidebar-layout{flex-direction:row;width:100%;min-height:100vh;display:flex}.sidebar-main-content{flex-grow:1;justify-content:center;height:100vh;padding:1.75rem 2rem;display:flex;overflow-y:auto}.paper-container{flex-direction:column;width:100%;max-width:700px;min-height:90vh;display:flex;position:relative}.academic-header{text-align:center;margin-bottom:1.25rem}.academic-title{letter-spacing:.5px;margin-bottom:.25rem;font-size:1.65rem;font-weight:500}.academic-subtitle{opacity:.6;margin-bottom:1rem;font-size:.95rem;font-style:italic}.latex-divider{border-top:1.5px solid var(--border-color);border-bottom:.5px solid var(--border-color);height:4px}.chat-log{flex-direction:column;flex-grow:1;gap:1.75rem;margin-bottom:2rem;display:flex;overflow-y:auto}.message-block{text-align:justify;text-justify:inter-word}.message-meta{letter-spacing:1.5px;text-transform:uppercase;border-bottom:.5px dashed var(--border-color);opacity:.55;margin-bottom:.4rem;padding-bottom:3px;font-size:.78rem;font-weight:500}.message-meta.user{text-align:right}.message-meta.advisor{text-align:left}.message-content{white-space:pre-wrap;font-size:1.05rem;line-height:1.7}.input-form{margin-top:auto}.input-row{align-items:flex-end;gap:8px;width:100%;display:flex}.chat-input{background-color:var(--input-bg);color:var(--text-color);border:1px solid var(--border-color);border-radius:0;outline:none;flex-grow:1;padding:10px 14px;font-family:inherit;font-size:1rem;transition:border-color .15s}.chat-input:focus{border-width:1.5px}.submit-btn{background-color:var(--text-color);color:var(--bg-color);border:1px solid var(--border-color);cursor:pointer;letter-spacing:.5px;white-space:nowrap;border-radius:0;padding:10px 26px;font-family:inherit;font-size:1rem;transition:background .15s,color .15s}.submit-btn:hover{background-color:var(--bg-color);color:var(--text-color)}.submit-btn:disabled{opacity:.45;cursor:not-allowed}.status-indicator{opacity:.55;margin-top:8px;font-size:.95rem;font-style:italic}.error-banner{border:1px solid var(--accent-color);color:var(--accent-color);margin-bottom:1rem;padding:10px 14px;font-size:.95rem;font-style:italic}.sidebar{border-right:1px solid var(--border-color);background-color:var(--sidebar-bg);flex-direction:column;flex-shrink:0;width:260px;height:100vh;padding:1.25rem 1rem;display:flex;position:sticky;top:0;overflow-y:auto}.sidebar-collapsed{border-right:1px solid var(--border-color);background-color:var(--sidebar-bg);flex-direction:column;flex-shrink:0;align-items:center;width:48px;height:100vh;padding:1rem 0;display:flex;position:sticky;top:0}.sidebar-icon-btn{border:1px solid var(--border-color);color:var(--text-color);cursor:pointer;background:0 0;margin-bottom:.75rem;padding:4px 10px;font-family:inherit;font-size:1rem;transition:background .15s}.sidebar-icon-btn:hover{background-color:var(--hover-bg)}.sidebar-header{justify-content:space-between;align-items:center;margin-bottom:1.25rem;display:flex}.sidebar-label{text-transform:uppercase;letter-spacing:2px;opacity:.5;font-family:inherit;font-size:.75rem;font-weight:500}.sidebar-collapse-btn{border:1px solid var(--border-color);color:var(--text-color);cursor:pointer;background:0 0;padding:2px 8px;font-family:inherit;font-size:.85rem;transition:background .15s}.sidebar-collapse-btn:hover{background-color:var(--hover-bg)}.sidebar-new-btn{border:1px solid var(--border-color);width:100%;color:var(--text-color);cursor:pointer;text-align:center;letter-spacing:.3px;background:0 0;margin-bottom:1.25rem;padding:8px 12px;font-family:inherit;font-size:.9rem;transition:background .15s}.sidebar-new-btn:hover:not(:disabled){background-color:var(--hover-bg)}.sidebar-new-btn:disabled{opacity:.45;cursor:not-allowed}.sidebar-chat-list{flex-direction:column;flex-grow:1;gap:1px;margin-bottom:1.25rem;display:flex;overflow-y:auto}.sidebar-empty{opacity:.45;padding:8px 2px;font-size:.9rem;font-style:italic}.sidebar-chat-item{cursor:pointer;border:1px solid #0000;justify-content:space-between;align-items:center;padding:7px 8px;font-family:inherit;transition:background .12s,border-color .12s;display:flex}.sidebar-chat-item:hover{background-color:var(--hover-bg)}.sidebar-chat-item.active{border-color:var(--border-color);background-color:var(--active-bg)}.sidebar-chat-title{text-overflow:ellipsis;white-space:nowrap;flex-grow:1;margin-right:6px;font-size:.9rem;overflow:hidden}.sidebar-chat-title.active{font-weight:500}.sidebar-chat-actions{flex-shrink:0;gap:2px;display:flex}.sidebar-action-btn{color:var(--text-color);cursor:pointer;opacity:.35;background:0 0;border:none;padding:2px 5px;font-family:inherit;font-size:.8rem;transition:opacity .12s}.sidebar-action-btn:hover{opacity:1}.sidebar-delete-btn{color:var(--accent-color);cursor:pointer;opacity:.4;background:0 0;border:none;padding:2px 5px;font-family:inherit;font-size:.8rem;transition:opacity .12s}.sidebar-delete-btn:hover{opacity:1}.sidebar-edit-input{border:1px solid var(--border-color);color:var(--text-color);background-color:#0000;outline:none;flex-grow:1;padding:2px 4px;font-family:inherit;font-size:.9rem}.sidebar-footer{border-top:.5px solid var(--border-color);padding-top:1rem}.sidebar-signout-btn{border:1px solid var(--border-color);width:100%;color:var(--text-color);cursor:pointer;text-align:center;letter-spacing:1px;text-transform:uppercase;background:0 0;padding:7px 12px;font-family:inherit;font-size:.8rem;transition:background .15s}.sidebar-signout-btn:hover{background-color:var(--hover-bg)}.login-card{border:1px solid var(--border-color);background-color:var(--input-bg);width:100%;max-width:440px;padding:2.5rem}.login-title{text-align:center;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:1rem;font-size:1.5rem;font-weight:500}.login-description{text-align:justify;text-justify:inter-word;opacity:.7;margin-bottom:1.75rem;font-size:.95rem;line-height:1.75}.login-google-btn{width:100%}.sidebar-main-content,.chat-log,.sidebar,.sidebar-collapsed,.sidebar-chat-list{-ms-overflow-style:none;scrollbar-width:none}.sidebar-main-content::-webkit-scrollbar{display:none}.chat-log::-webkit-scrollbar{display:none}.sidebar::-webkit-scrollbar{display:none}.sidebar-collapsed::-webkit-scrollbar{display:none}.sidebar-chat-list::-webkit-scrollbar{display:none}.skeleton-msg{flex-direction:column;gap:10px;margin-bottom:1.75rem;animation:1.5s ease-in-out infinite pulse;display:flex}.skeleton-msg.user{align-items:flex-end}.skeleton-meta{background-color:var(--border-color);opacity:.15;width:140px;height:12px;margin-bottom:2px}.skeleton-meta.user{width:110px}.skeleton-line{background-color:var(--border-color);opacity:.08;height:15px}.skeleton-line.user{opacity:.06}@keyframes pulse{0%{opacity:.6}50%{opacity:.9}to{opacity:.6}}.attach-btn{background-color:var(--input-bg);color:var(--text-color);border:1px solid var(--border-color);cursor:pointer;border-radius:0;flex-shrink:0;justify-content:center;align-items:center;height:44px;padding:10px 14px;font-size:1.1rem;line-height:1;transition:background .15s,opacity .15s;display:flex}.attach-btn:hover:not(:disabled){background-color:var(--hover-bg)}.attach-btn:disabled{opacity:.45;cursor:not-allowed}.image-preview-bar{align-items:center;margin-bottom:8px;display:flex}.image-preview-wrapper{border:1px solid var(--border-color);background-color:var(--input-bg);padding:4px;display:inline-block;position:relative}.image-preview-thumb{object-fit:cover;max-width:80px;max-height:80px;display:block}.image-preview-remove-btn{background-color:var(--accent-color);color:#fff;cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:20px;height:20px;font-size:11px;line-height:1;display:flex;position:absolute;top:-6px;right:-6px}.message-image-container{margin-top:6px;margin-bottom:8px}.image-preview-thumb,.message-image{cursor:pointer;transition:opacity .15s}.image-preview-thumb:hover,.message-image:hover{opacity:.85}.message-image{border:1px solid var(--border-color);object-fit:contain;max-width:100%;max-height:350px;display:block}.image-modal-overlay{z-index:1000;cursor:pointer;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background-color:#000000d1;justify-content:center;align-items:center;width:100vw;height:100vh;padding:2rem;display:flex;position:fixed;top:0;left:0}.image-modal-content{cursor:default;max-width:90vw;max-height:90vh;position:relative}.image-modal-img{object-fit:contain;border:1px solid var(--border-color);background-color:#000;max-width:90vw;max-height:85vh;display:block;box-shadow:0 10px 30px #00000080}.image-modal-close-btn{background-color:var(--accent-color);color:#fff;border:1px solid var(--border-color);cursor:pointer;z-index:1001;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;font-size:13px;line-height:1;transition:transform .12s;display:flex;position:absolute;top:-14px;right:-14px}.image-modal-close-btn:hover{transform:scale(1.1)}