.chat-layout{display:grid;grid-template-columns:340px 1fr;gap:24px;align-items:stretch;margin-top:14px;height:clamp(520px,68vh,720px)}@media (max-width:900px){.chat-layout{grid-template-columns:1fr;height:auto;gap:20px}}.chat-sidebar{display:flex;flex-direction:column;gap:16px;overflow-y:auto;padding-right:4px}@media (max-width:900px){.chat-sidebar{overflow-y:visible}}.chat-main{display:flex;flex-direction:column;background:var(--panel);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:20px;padding:24px;box-shadow:var(--shadow-lg);height:100%;position:relative}@media (max-width:900px){.chat-main{height:600px}}.chat-thread-container{flex:1 1;overflow-y:auto;padding-right:8px;display:flex;flex-direction:column}.chat-thread{display:flex;flex-direction:column;gap:16px;margin:10px 0}.bubble{max-width:80%;padding:14px 18px;border-radius:16px;font-size:15px;line-height:1.5;box-shadow:var(--shadow-sm);animation:fadeInUp .4s cubic-bezier(.16,1,.3,1) both}.bubble.user{align-self:flex-end;background:linear-gradient(135deg,var(--accent),var(--accent-alt));color:#fff;border-bottom-right-radius:4px;box-shadow:0 4px 12px rgba(47,84,255,.15)}.bubble.user .answer{color:#fff}.bubble.assistant{align-self:flex-start;background:var(--panel-2);border:1px solid var(--border);border-bottom-left-radius:4px}.empty-hint{text-align:center;color:var(--muted);padding:40px 24px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;flex:1 1}.chat-filebar{flex-shrink:0;margin-bottom:14px;padding-bottom:14px;border-bottom:1px solid var(--border)}.chat-uploadwrap{width:100%;max-width:460px}.chat-uploadwrap .drophero{margin-bottom:0}.chat-input-row{display:flex;gap:12px;align-items:flex-end;background:transparent;padding-top:16px;border-top:1px solid var(--border)}.chat-input-row textarea{flex:1 1;margin:0;min-height:52px;max-height:120px;border-radius:16px;resize:none}.chat-send{width:52px;height:52px;min-height:52px;padding:0;gap:0;border-radius:50%;justify-content:center;flex-shrink:0}.chat-send-spinner{width:17px;height:17px;margin-right:0;vertical-align:0}.chat-error{display:flex;align-items:center;gap:10px;margin-top:10px;padding:11px 14px;border-radius:12px;font-size:13.5px;color:var(--danger);background:color-mix(in oklab,var(--danger) 9%,var(--panel));border:1px solid color-mix(in oklab,var(--danger) 35%,transparent)}.chat-error svg{flex-shrink:0}.chat-error-msg{flex:1 1;min-width:0}.chat-retry{display:inline-flex;align-items:center;gap:6px;flex-shrink:0;padding:6px 12px;border-radius:9px;font-size:12.5px;font-weight:700;cursor:pointer;color:var(--text);background:var(--panel);border:1px solid var(--border);transition:all .15s}.chat-retry:hover:not(:disabled){border-color:var(--danger);color:var(--danger)}.chat-retry:disabled{opacity:.5;cursor:default}.bubble{position:relative}.bubble-edit{position:absolute;top:50%;left:-8px;transform:translateX(-100%) translateY(-50%);display:inline-flex;align-items:center;gap:4px;padding:4px 9px;border-radius:8px;font-size:11.5px;font-weight:700;white-space:nowrap;cursor:pointer;color:var(--muted);background:var(--panel-2);border:1px solid var(--border);opacity:0;transition:opacity .15s}.bubble-edit:focus-visible,.bubble.user:hover .bubble-edit{opacity:1}.bubble-edit:hover{color:var(--accent);border-color:var(--accent)}@media (hover:none){.bubble-edit{opacity:.7}}