:root{color-scheme:light;--bg:#faf8f5;--bg-soft:#ffffff;--panel:rgba(255,255,255,0.97);--border:rgba(0,0,0,0.08);--text:#2d2a26;--muted:#7a7267;--accent:#e07a3c;--accent-hover:#c86a30;--accent-2:#4a9e98;--danger:#d63031;--ok:#27ae60;--warning:#d4a017;--shadow:0 2px 12px rgba(0,0,0,0.06);--bubble-ai:#ffffff;--bubble-user:#e07a3c;--bubble-user-text:#ffffff;--font-body:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;--radius:18px;--radius-sm:12px}*{box-sizing:border-box}body,html{margin:0;min-height:100dvh;-webkit-overflow-scrolling:touch}body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:15px;line-height:1.6}a{color:var(--accent-2);text-decoration:none}button,input,select,textarea{font:inherit}.chat-app{display:flex;flex-direction:column;height:100dvh;max-width:720px;margin:0 auto;overflow:hidden}.chat-header{display:flex;align-items:center;justify-content:center;padding:14px 16px;border-bottom:1px solid var(--border);background:var(--bg-soft);flex-shrink:0}.chat-header__title{font-size:16px;font-weight:600;color:var(--text)}.chat-header__subtitle{font-size:12px;color:var(--muted);margin-top:2px}.chat-messages{flex:1 1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;scroll-behavior:smooth}.chat-messages::-webkit-scrollbar{width:4px}.chat-messages::-webkit-scrollbar-thumb{background:rgba(0,0,0,.1);border-radius:4px}.bubble-row{display:flex;align-items:flex-end;gap:8px;max-width:85%;animation:bubble-in .3s ease}.bubble-row--user{align-self:flex-end;flex-direction:row-reverse}.bubble-row--ai{align-self:flex-start}.bubble{padding:12px 16px;border-radius:var(--radius);font-size:15px;line-height:1.6;word-break:break-word;box-shadow:var(--shadow)}.bubble--user{background:var(--bubble-user);color:var(--bubble-user-text);border-bottom-right-radius:4px}.bubble--ai{background:var(--bubble-ai);color:var(--text);border-bottom-left-radius:4px;border:1px solid var(--border)}.bubble--typing{display:flex;gap:4px;align-items:center;padding:14px 20px}.bubble--typing span{width:8px;height:8px;border-radius:50%;background:var(--muted);animation:typing-dot 1.4s infinite}.bubble--typing span:nth-child(2){animation-delay:.2s}.bubble--typing span:nth-child(3){animation-delay:.4s}.bubble__steps{list-style:none;padding:0;margin:8px 0 0;counter-reset:step}.bubble__steps li{counter-increment:step;padding:6px 0 6px 28px;position:relative;border-bottom:1px solid rgba(0,0,0,.04)}.bubble__steps li:last-child{border-bottom:none}.bubble__steps li:before{content:counter(step);position:absolute;left:0;top:6px;width:20px;height:20px;border-radius:50%;background:var(--accent);color:white;font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:center}.bubble__citations-toggle{display:inline-flex;align-items:center;gap:4px;margin-top:10px;padding:6px 12px;border-radius:16px;background:rgba(0,0,0,.04);border:none;color:var(--accent-2);font-size:13px;cursor:pointer;transition:background .2s}.bubble__citations-toggle:hover{background:rgba(0,0,0,.07)}.bubble__citations-list{margin-top:8px;padding:0;list-style:none;font-size:13px;color:var(--muted)}.bubble__citations-list li{padding:6px 0;border-bottom:1px solid rgba(0,0,0,.04)}.bubble__citations-list li:last-child{border-bottom:none}.bubble__citations-list a{color:var(--accent-2);text-decoration:underline;text-underline-offset:2px}.chat-composer{flex-shrink:0;padding:12px 16px calc(12px + env(safe-area-inset-bottom, 0px));border-top:1px solid var(--border);background:var(--bg-soft)}.suggested-replies{display:flex;gap:8px;overflow-x:auto;padding-bottom:10px;scrollbar-width:none}.suggested-replies::-webkit-scrollbar{display:none}.suggested-replies button{flex-shrink:0;padding:6px 14px;border-radius:16px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:13px;cursor:pointer;transition:all .2s;white-space:nowrap}.suggested-replies button:hover{border-color:var(--accent);color:var(--accent)}.composer-row{display:flex;align-items:flex-end;gap:8px}.composer-input{flex:1 1;resize:none;border:1px solid var(--border);border-radius:20px;padding:10px 16px;font-size:15px;line-height:1.5;max-height:120px;background:var(--bg);color:var(--text);outline:none;transition:border-color .2s}.composer-input:focus{border-color:var(--accent)}.composer-input::placeholder{color:var(--muted)}.composer-send{width:40px;height:40px;border-radius:50%;border:none;background:var(--accent);color:white;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;transition:background .2s,transform .1s}.composer-send:hover{background:var(--accent-hover)}.composer-send:active{transform:scale(.92)}.composer-send:disabled{opacity:.4;cursor:not-allowed}.composer-send svg{width:18px;height:18px}.composer-stop{width:40px;height:40px;border-radius:50%;border:none;background:#666;color:white;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;transition:background .2s,transform .1s}.composer-stop:hover{background:#555}.composer-stop:active{transform:scale(.92)}.composer-stop svg{width:16px;height:16px}.welcome{flex:1 1;flex-direction:column;padding:32px 16px;text-align:center;gap:24px}.welcome,.welcome__icon{display:flex;align-items:center;justify-content:center}.welcome__icon{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#f4a261);font-size:28px;color:white;box-shadow:0 8px 24px rgba(224,122,60,.2)}.welcome__title{font-size:22px;font-weight:700;color:var(--text);margin:0}.welcome__desc{font-size:14px;color:var(--muted);margin:0;max-width:320px}.welcome__scenarios{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));grid-gap:10px;gap:10px;width:100%;max-width:480px}.welcome__scenario-btn{padding:12px 10px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-soft);color:var(--text);font-size:13px;cursor:pointer;transition:all .2s;text-align:center}.welcome__scenario-btn:hover{border-color:var(--accent);background:rgba(224,122,60,.05);color:var(--accent)}.feedback-row{display:flex;align-items:center;gap:8px;margin-top:8px;padding-left:4px}.feedback-btn{padding:4px 12px;border-radius:14px;border:1px solid var(--border);background:transparent;font-size:12px;color:var(--muted);cursor:pointer;transition:all .2s}.feedback-btn:hover{border-color:var(--accent);color:var(--accent)}.feedback-btn--active{background:var(--accent);color:white;border-color:var(--accent)}.feedback-msg{font-size:12px;color:var(--ok)}@keyframes bubble-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes typing-dot{0%,60%,to{opacity:.3;transform:scale(.8)}30%{opacity:1;transform:scale(1)}}.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}.skip-link:focus{position:fixed;top:8px;left:8px;width:auto;height:auto;padding:8px 16px;background:var(--accent);color:white;border-radius:8px;z-index:9999}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}@media (max-width:480px){.welcome__scenarios{grid-template-columns:repeat(2,1fr)}.bubble-row{max-width:90%}}@media (min-width:768px){.chat-app{border-left:1px solid var(--border);border-right:1px solid var(--border)}.bubble-row{max-width:70%}}@media print{.chat-composer,.chat-header,.feedback-row,.suggested-replies{display:none}.chat-messages{overflow:visible;height:auto}.bubble{box-shadow:none;border:1px solid #ddd}}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;transition-duration:.01ms!important}}.error-bubble{align-self:center;padding:10px 16px;border-radius:var(--radius-sm);background:rgba(214,48,49,.08);color:var(--danger);font-size:13px;text-align:center}.error-bubble button{margin-left:8px;padding:4px 12px;border-radius:12px;border:1px solid var(--danger);background:transparent;color:var(--danger);font-size:12px;cursor:pointer}