.sidebar{width:300px;border-right:1px solid #1e1e1e;display:flex;flex-direction:column;background:#141414;flex-shrink:0}.sidebar-header{padding:16px;border-bottom:1px solid #1e1e1e;display:flex;justify-content:space-between;align-items:center}.sidebar-user{display:flex;align-items:center;gap:10px}.btn-ghost{padding:6px 12px;border-radius:8px;border:1px solid #333;background:transparent;color:#888;font-size:12px}.btn-ghost:hover{border-color:#555;color:#ccc}.sidebar-section{padding:12px 16px;border-bottom:1px solid #1e1e1e}.section-label{font-size:11px;text-transform:uppercase;color:#555;letter-spacing:1px;margin-bottom:8px;padding:0 4px}.new-chat-list{display:flex;flex-wrap:wrap;gap:6px}.new-chat-btn{padding:5px 12px;border-radius:20px;border:1px solid #2a2a2a;background:transparent;color:#aaa;font-size:12px}.new-chat-btn:hover{border-color:#555;color:#fff}.chat-list{flex:1;overflow-y:auto;padding:12px 8px}.chat-item{display:flex;align-items:center;justify-content:space-between;padding:12px;border-radius:10px;cursor:pointer;margin-bottom:2px;-webkit-tap-highlight-color:transparent}.chat-item:hover{background:#1a1a1a}.chat-item--active{background:#1e1e1e}.chat-item-left{display:flex;align-items:center;gap:10px;flex:1;min-width:0}.avatar-wrapper{position:relative;flex-shrink:0}.unread-dot{position:absolute;top:-2px;right:-2px;width:10px;height:10px;background:#3b82f6;border-radius:50%;border:2px solid #141414}.chat-item-text{min-width:0}.chat-item-text strong{font-size:14px;display:block}.chat-item-preview{font-size:12px;color:#666;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:170px;margin-top:2px}.delete-btn{background:transparent;border:none;color:#444;font-size:14px;padding:4px 8px;border-radius:6px;flex-shrink:0;opacity:0;transition:opacity .15s}.chat-item:hover .delete-btn{opacity:1}.delete-btn:hover{color:#e55;background:#ff32321a}@media(max-width:640px){.sidebar{width:100%;position:absolute;top:0;right:0;bottom:0;left:0;transform:translate(0);transition:transform .3s ease;z-index:1}.app-layout--chat-open .sidebar{transform:translate(-100%)}.section-label{font-size:12px;padding:8px 4px 6px}.chat-item{padding:14px 12px}.chat-item-text strong{font-size:15px}.chat-item-preview{max-width:calc(100vw - 120px)}}.chat-window{flex:1;display:flex;flex-direction:column;min-width:0}.chat-window--empty{justify-content:center;align-items:center}.empty-state{text-align:center;color:#555}.empty-icon{font-size:48px;display:block;margin-bottom:12px}.chat-header{padding:14px 20px;border-bottom:1px solid #1e1e1e;display:flex;align-items:center;gap:10px;background:#141414}.back-btn{display:none;background:transparent;border:none;color:#aaa;font-size:22px;padding:0 8px 0 0;line-height:1;-webkit-tap-highlight-color:transparent}.back-btn:hover{color:#fff}.messages-area{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:6px}.loading-text{color:#555;font-size:13px;text-align:center;padding:40px 0}.msg-row{display:flex}.msg-row--mine{justify-content:flex-end}.msg-row--theirs{justify-content:flex-start}.msg-bubble{max-width:65%;padding:10px 14px;border-radius:16px}.msg-bubble--mine{background:#2563eb;border-bottom-right-radius:4px}.msg-bubble--theirs{background:#1e1e1e;border-bottom-left-radius:4px}.msg-text{font-size:14px;line-height:1.5;word-wrap:break-word}.msg-time{font-size:10px;color:#ffffff59;margin-top:4px;display:block}.typing-indicator{font-size:12px;color:#666;padding:4px 0;font-style:italic}.input-area{padding:12px 16px;border-top:1px solid #1e1e1e;display:flex;gap:8px;background:#141414}.msg-input{flex:1;padding:12px 16px;border-radius:12px;border:1px solid #2a2a2a;background:#111;color:#fff;font-size:14px;outline:none}.msg-input:focus{border-color:#444}.send-btn{padding:12px 24px;border-radius:12px;border:none;background:#2563eb;color:#fff;font-weight:600;font-size:14px;-webkit-tap-highlight-color:transparent}.send-btn:hover{background:#1d4ed8}@media(max-width:640px){.chat-window{position:absolute;top:0;right:0;bottom:0;left:0;transform:translate(100%);transition:transform .3s ease;z-index:2;background:#0f0f0f}.app-layout--chat-open .chat-window{transform:translate(0)}.back-btn{display:block}.chat-header{padding:14px 16px}.messages-area{padding:16px 12px}.msg-bubble{max-width:80%}.input-area{padding:10px 12px;padding-bottom:max(10px,env(safe-area-inset-bottom))}.msg-input{font-size:16px}.send-btn{padding:12px 18px}.chat-window--empty{display:none}}.app-layout{display:flex;height:100vh}.loading-screen{display:flex;align-items:center;justify-content:center;height:100vh;background:#111}.loading-spinner{width:40px;height:40px;border:3px solid #333;border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:640px){.app-layout{position:relative;overflow:hidden}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#0f0f0f;color:#fff;height:100vh;overflow:hidden}#root{height:100vh}input{font-family:inherit}button{font-family:inherit;cursor:pointer}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#333;border-radius:3px}