:root{--bg:#fafafa;--surface:#fff;--text-primary:#171717;--text-secondary:#5f5e5a;--text-muted:#888780;--border:#00000014;--border-strong:#00000026;--accent:#2e2e2c;--accent-hover:#454542;--accent-tint:#2e2e2c0f;--imsg-blue:#0a84ff;--imsg-blue-hover:#0972db;--radius:10px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-voice:Georgia, "Times New Roman", serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text-primary);font-family:var(--font-sans);margin:0}.mobile-tabs{display:none}.shell-page{background:#f0f0ee;min-height:100vh;padding:2.5rem 24px}.shell-container{background:var(--surface);border:.5px solid var(--border);border-radius:20px;width:clamp(320px,92vw,1400px);margin:0 auto;overflow:hidden;box-shadow:0 1px 3px #0000000a,0 8px 24px #0000000a}.shell-topbar{border-bottom:.5px solid var(--border);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.shell-topbar .mark{font-size:17px;font-weight:500}.shell-topbar .mark .dot{color:var(--accent)}.shell-body{grid-template-columns:1.3fr 1fr;height:clamp(480px,78vh,820px);display:grid}.shell-ask{border-right:.5px solid var(--border);flex-direction:column;min-width:0;min-height:0;display:flex}.shell-header-row{border-bottom:.5px solid var(--border);justify-content:flex-end;padding:10px 16px;display:flex}.shell-header-row button{border:.5px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);color:var(--text-secondary);cursor:pointer;padding:10px 14px;font-size:12px}.shell-header-row button:disabled{opacity:.4;cursor:default}.shell-browse{flex-direction:column;min-width:0;min-height:0;display:flex}.shell-browse-header{color:var(--text-secondary);border-bottom:.5px solid var(--border);padding:14px 24px 10px;font-size:13px;font-weight:600}.shell-browse-list{flex:1;padding:0 24px 20px;overflow-y:auto}.shell-footer{border-top:.5px solid 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0;text-decoration:none;display:flex}.list-thumb{object-fit:cover;border-radius:6px;flex-shrink:0;width:64px;height:64px}.list-stripe{background:var(--accent);border-radius:2px;flex-shrink:0;align-self:stretch;width:4px}.list-body{flex:1;min-width:0}.list-title{color:var(--text-primary);margin:0 0 4px;font-size:14px;font-weight:500}.list-meta{color:var(--text-muted);text-transform:capitalize;font-size:12px}.chat-thread{flex-direction:column;flex:1;gap:20px;padding:20px 24px;display:flex;overflow-y:auto}.chat-user-msg{background:var(--imsg-blue);color:#fff;border-radius:14px 14px 4px;align-self:flex-end;max-width:80%;padding:10px 16px;font-size:14px}.chat-assistant-msg{align-self:flex-start;max-width:92%}.chat-answer{font-family:var(--font-voice);color:var(--text-primary);margin:0 0 10px;font-size:15px;line-height:1.75}.chat-sources{flex-direction:column;gap:6px;display:flex}.chat-source-link{color:var(--text-secondary);border-bottom:.5px solid var(--border-strong);width:fit-content;padding-bottom:5px;font-size:12px;text-decoration:none;display:block}.chat-source-link:hover{border-bottom-color:var(--accent);color:var(--accent)}.chat-typing{align-items:center;gap:5px;padding:4px 0;display:flex}.chat-typing span{background:var(--text-muted);border-radius:50%;width:6px;height:6px;animation:1.2s ease-in-out infinite bounce}.chat-typing span:nth-child(2){animation-delay:.15s}.chat-typing span:nth-child(3){animation-delay:.3s}@keyframes bounce{0%,60%,to{opacity:.4;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}.chat-input-row{border-top:.5px solid var(--border);gap:8px;padding:14px 16px;display:flex}.chat-input-row input{border:.5px solid var(--border-strong);background:var(--bg);height:44px;color:var(--text-primary);border-radius:22px;flex:1;padding:0 16px;font-size:16px}.chat-input-row button{background:var(--imsg-blue);color:#fff;cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;font-size:16px;display:flex}.chat-input-row button:hover{background:var(--imsg-blue-hover)}.chat-input-row button:disabled{background:var(--border-strong);cursor:default}.chat-input-row button svg{width:18px;height:18px}.chat-empty{justify-content:center;align-items:center;display:flex}.chat-empty-inner{text-align:center;max-width:380px;padding:0 24px}.chat-empty-title{color:var(--text-primary);margin:0 0 8px;font-size:22px;font-weight:700}.chat-empty-subtitle{color:var(--text-muted);margin:0 0 24px;font-size:13px;line-height:1.5}.chat-suggestions{flex-direction:column;gap:8px;display:flex}.chat-suggestion{text-align:left;border:.5px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);color:var(--text-secondary);cursor:pointer;padding:10px 14px;font-size:13px}.chat-suggestion:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-tint)}.fade-in{animation:.5s forwards fadeIn}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@media (width<=900px){.shell-page{padding:1rem 12px}.shell-container{width:100%}.shell-browse-list{padding:0 16px 20px}.filter-row select{flex:1;min-width:0}.mobile-tabs{border-bottom:.5px solid var(--border);gap:4px;padding:10px 16px;display:flex}.mobile-tabs button{border:.5px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);color:var(--text-secondary);cursor:pointer;flex:1;padding:10px;font-size:14px}.mobile-tabs button.active{border-color:var(--accent);background:var(--accent-tint);color:var(--accent);font-weight:500}.shell-body{grid-template-columns:1fr;height:85vh}.shell-ask,.shell-browse{height:100%}.shell-ask.mobile-hidden,.shell-browse.mobile-hidden{display:none}}