:root{--bg: #0f1115;--surface: #1a1d26;--surface-2: #242836;--border: #2e3340;--text: #e8eaed;--text-dim: #9aa0ab;--accent: #6366f1;--accent-hover: #4f46e5;--danger: #ef4444;--radius: 16px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:16px;line-height:1.5;overflow:hidden;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}input,textarea{font-family:inherit;font-size:16px}.touch-target{min-height:44px;min-width:44px}.app{display:flex;flex-direction:column;height:100%;padding-top:var(--safe-top);padding-bottom:var(--safe-bottom)}.topbar{display:flex;align-items:center;gap:12px;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border)}.topbar .brand{font-weight:700;font-size:18px;letter-spacing:.5px}.topbar .tabs{display:flex;gap:4px;margin-left:12px;background:var(--surface-2);border-radius:12px;padding:4px}.topbar .tabs button{padding:8px 18px;border-radius:9px;color:var(--text-dim);font-weight:600;transition:all .15s}.topbar .tabs button.active{background:var(--accent);color:#fff}.topbar .spacer{flex:1}.topbar .user{display:flex;align-items:center;gap:10px;color:var(--text-dim);font-size:14px}.topbar .user button{color:var(--text-dim);font-size:14px;padding:6px 12px;border-radius:8px;border:1px solid var(--border)}.content{flex:1;overflow:hidden;display:flex}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:12px;font-weight:600;background:var(--accent);color:#fff;transition:background .15s,transform .1s}.btn:active{transform:scale(.97)}.btn:hover{background:var(--accent-hover)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.ghost{background:var(--surface-2);color:var(--text)}.auth-screen{display:flex;align-items:center;justify-content:center;height:100%;width:100%}.auth-card{width:380px;max-width:90%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:36px 32px}.auth-card h1{font-size:24px;margin-bottom:6px}.auth-card p{color:var(--text-dim);margin-bottom:24px;font-size:14px}.auth-card .field{margin-bottom:16px}.auth-card label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:6px}.auth-card input{width:100%;padding:14px 16px;border-radius:12px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);outline:none}.auth-card input:focus{border-color:var(--accent)}.auth-card .btn{width:100%;margin-top:8px}.auth-card .switch{text-align:center;margin-top:18px;font-size:14px;color:var(--text-dim)}.auth-card .switch button{color:var(--accent);font-weight:600}.error-text{color:var(--danger);font-size:14px;margin-bottom:12px}.chat-view{display:flex;width:100%;height:100%}.chat-sidebar{width:280px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column}.chat-sidebar .new-btn{margin:16px}.conv-list{flex:1;overflow-y:auto;padding:0 12px;-webkit-overflow-scrolling:touch}.conv-item{display:flex;align-items:center;gap:8px;padding:14px;border-radius:12px;margin-bottom:4px;color:var(--text-dim);font-size:15px}.conv-item.active{background:var(--surface-2);color:var(--text)}.conv-item .title{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-item .del{opacity:0;color:var(--text-dim);font-size:18px}.conv-item.active .del,.conv-item:hover .del{opacity:1}.chat-main{flex:1;display:flex;flex-direction:column;min-width:0}.messages{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px;-webkit-overflow-scrolling:touch}.msg{max-width:80%;padding:14px 18px;border-radius:18px;white-space:pre-wrap;word-break:break-word}.msg.user{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:6px}.msg.assistant{align-self:flex-start;background:var(--surface-2);border-bottom-left-radius:6px}.composer{display:flex;gap:12px;padding:16px 24px;border-top:1px solid var(--border);background:var(--surface)}.composer textarea{flex:1;resize:none;max-height:140px;padding:14px 16px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);outline:none}.composer textarea:focus{border-color:var(--accent)}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-dim);gap:8px}.empty-state .big{font-size:22px;color:var(--text)}.image-view{display:flex;flex-direction:column;width:100%;height:100%}.image-compose{padding:20px 24px;border-bottom:1px solid var(--border);background:var(--surface);display:flex;gap:12px;align-items:flex-end}.image-compose textarea{flex:1;resize:none;height:64px;padding:14px 16px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);outline:none}.image-compose textarea:focus{border-color:var(--accent)}.image-grid{flex:1;overflow-y:auto;padding:24px;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;align-content:start;-webkit-overflow-scrolling:touch}.image-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.image-card img{width:100%;aspect-ratio:1;object-fit:cover;display:block;background:var(--surface-2)}.image-card .meta{padding:12px 14px}.image-card .meta .prompt{font-size:13px;color:var(--text-dim);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.image-card .meta .tag{display:inline-block;margin-top:8px;font-size:11px;color:var(--accent);background:var(--surface-2);padding:3px 8px;border-radius:6px}.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.generating-card{display:flex;align-items:center;justify-content:center;aspect-ratio:1;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius);color:var(--text-dim);gap:10px}@media(max-width:820px){.chat-sidebar{width:220px}}