:root{--c-bg: #f5f7fa;--c-card: #ffffff;--c-border: #e5e7eb;--c-text: #1f2937;--c-sub: #6b7280;--c-primary: #5b21b6;--c-primary-hover: #4c1d95;--c-assistant: #f1f5f9;--c-assistant-border: #e2e8f0;--anim-duration: .14s}.dark{--c-bg: #0f1115;--c-card: #1b1f26;--c-border: #2a3039;--c-text: #f1f5f9;--c-sub: #9ca3af;--c-primary: #7c3aed;--c-primary-hover: #6d28d9;--c-assistant: #262c35;--c-assistant-border: #323945}.chat-root{display:flex;align-items:center;justify-content:center;height:100vh;background:var(--c-bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;padding:16px;box-sizing:border-box}.chat-shell{width:100%;max-width:600px;height:100%;max-height:780px;background:var(--c-card);border:1px solid var(--c-border);border-radius:28px;display:flex;flex-direction:column;box-shadow:0 4px 24px -4px #00000014,0 8px 48px -8px #00000014;overflow:hidden;transition:max-width .25s ease}.chat-shell__header{padding:14px 20px 12px;display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:600;letter-spacing:.3px;border-bottom:1px solid var(--c-border)}.chat-shell__title{font-size:15px;font-weight:600;color:var(--c-text)}.chat-shell__actions{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--c-sub)}.status-dot{width:8px;height:8px;border-radius:50%;background:#ef4444;box-shadow:0 0 0 2px var(--c-card)}.status-dot.on{background:#10b981}.icon-btn{border:none;background:var(--c-assistant);color:var(--c-text);width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:14px}.icon-btn:hover{filter:brightness(.95)}.chat-shell__messages{flex:1;overflow-y:auto;padding:16px 18px 8px;display:flex;flex-direction:column;gap:4px;scroll-behavior:smooth}.date-separator{text-align:center;margin:12px 0 8px;position:relative;font-size:11px;font-weight:500;color:var(--c-sub);letter-spacing:.5px;text-transform:uppercase}.date-separator span{background:var(--c-card);padding:2px 10px;border-radius:14px;border:1px solid var(--c-border);display:inline-block}.typing-row{display:flex;padding:4px 4px 10px}.typing-chip{background:var(--c-assistant);border:1px solid var(--c-assistant-border);border-radius:18px;padding:6px 12px;display:flex;gap:4px}.typing-chip span{width:6px;height:6px;border-radius:50%;background:var(--c-sub);opacity:.4;animation:blink 1.4s infinite ease-in-out}.typing-chip span:nth-child(2){animation-delay:.2s}.typing-chip span:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.3}40%{opacity:1}}.chat-shell__input-bar{padding:14px 18px 16px;display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--c-border)}.input-wrap{display:flex;background:var(--c-assistant);border:1px solid var(--c-assistant-border);border-radius:24px;padding:4px 6px 4px 14px;align-items:center;gap:6px}.input-wrap input{flex:1;background:transparent;border:none;outline:none;padding:10px 4px;font-size:14px;color:var(--c-text)}.input-wrap input::placeholder{color:var(--c-sub)}.send-btn{background:var(--c-primary);color:#fff;border:none;width:40px;height:40px;border-radius:20px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .15s}.send-btn:hover:not(:disabled){background:var(--c-primary-hover)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.mini-spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.offline-banner{text-align:center;font-size:11px;padding:4px 8px;background:#fde68a;color:#92400e;border:1px solid #fcd34d;border-radius:10px;align-self:center}.chat-shell__footer{text-align:center;padding:6px 0 14px;font-size:11px;color:var(--c-sub)}.chat-shell__messages::-webkit-scrollbar{width:6px}.chat-shell__messages::-webkit-scrollbar-thumb{background:var(--c-border);border-radius:3px}.quick-replies{display:flex;flex-wrap:wrap;gap:6px;padding:8px 8px 4px}.qr-btn{background:var(--c-assistant);color:var(--c-sub);border:1px solid var(--c-assistant-border);padding:4px 10px;font-size:11px;line-height:1.2;border-radius:999px;cursor:pointer;transition:background .15s,color .15s,border-color .15s}.qr-btn:hover{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}.qr-btn:active{transform:translateY(1px)}.qr-btn:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}.scroll-latest-btn{position:absolute;bottom:108px;right:20px;background:var(--c-assistant);border:1px solid var(--c-assistant-border);color:var(--c-text);width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 16px -4px #00000040;font-size:18px;transition:background .15s,transform .15s;z-index:5}.scroll-latest-btn:hover{background:var(--c-primary);color:#fff}.scroll-latest-btn:active{transform:translateY(2px)}.scroll-latest-btn:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}.icon-btn:focus-visible,.send-btn:focus-visible,.qr-btn:focus-visible,.scroll-latest-btn:focus-visible{box-shadow:0 0 0 2px var(--c-card),0 0 0 4px var(--c-primary);outline:none}.chat-shell{position:relative}.bubble-row{display:flex;width:100%}.bubble-row.user{justify-content:flex-end}.bubble-row.assistant{justify-content:flex-start}.bubble{max-width:78%;background:var(--c-assistant);color:var(--c-text);border:1px solid var(--c-assistant-border);padding:10px 14px 8px;border-radius:18px;font-size:14px;line-height:1.55;position:relative;display:flex;flex-direction:column;gap:4px;animation:bubble-in .28s ease}.bubble.user{background:var(--c-primary);color:#fff;border:none}.bubble.user .bubble-meta{color:#ffffffa6}.bubble.assistant{background:var(--c-assistant)}.bubble-text{white-space:pre-line;word-break:break-word}.bubble-meta{font-size:10px;font-weight:500;letter-spacing:.4px;color:var(--c-sub);align-self:flex-end}.message-paragraph{margin-bottom:6px}.message-paragraph:last-child{margin-bottom:0}.bullet-point{margin:2px 0 2px 2px;padding-left:4px}.bubble-text strong{font-weight:600}.numbered-point{margin:2px 0 2px 2px;padding-left:4px}.inline-code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,monospace;background:#0000000f;padding:2px 5px;border-radius:5px;font-size:12px}.dark .inline-code{background:#ffffff1f}.msg-link{color:var(--c-primary);text-decoration:none;border-bottom:1px solid rgba(0,0,0,.15)}.msg-link:hover{text-decoration:underline}.bubble.pos-first{border-bottom-left-radius:14px;border-bottom-right-radius:14px}.bubble.pos-middle{margin-top:2px;border-radius:14px}.bubble.pos-last{margin-top:2px}.bubble-row+.bubble-row.user .bubble.user.pos-middle,.bubble-row+.bubble-row.assistant .bubble.assistant.pos-middle{margin-top:2px}@keyframes bubble-in{0%{opacity:0;transform:translateY(6px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}@media (max-width:900px){.bubble{max-width:82%}}@media (max-width:640px){.bubble{max-width:88%;font-size:13px}}@media (max-width:820px){.chat-shell{max-width:520px}}@media (max-width:640px){.chat-shell{max-width:100%;max-height:100%;height:100%;border-radius:0;box-shadow:none}}