.login-screen{display:flex;justify-content:center;align-items:center;height:100vh}.login-card{background:#1a1a1a;border-radius:16px;padding:32px;width:380px;border:1px solid #2a2a2a}.login-title{font-size:28px;margin-bottom:4px}.login-subtitle{color:#666;font-size:14px;margin-bottom:24px}.login-create{display:flex;gap:8px;margin-bottom:24px}.login-input{flex:1;padding:10px 14px;border-radius:10px;border:1px solid #333;background:#111;color:#fff;font-size:14px;outline:none}.login-input:focus{border-color:#555}.btn-primary{padding:10px 20px;border-radius:10px;border:none;background:#fff;color:#000;font-weight:600;font-size:14px;cursor:pointer}.btn-primary:hover{background:#ddd}.login-user-list{display:flex;flex-direction:column;gap:6px}.login-user-btn{display:flex;align-items:center;gap:12px;padding:10px 14px;border-radius:10px;border:1px solid #2a2a2a;background:#111;color:#fff;font-size:14px;text-align:left}.login-user-btn:hover{border-color:#444;background:#1a1a1a}.avatar{width:36px;height:36px;border-radius:50%;background:#333;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px;flex-shrink:0}.avatar-sm{width:32px;height:32px;border-radius:50%;background:#333;display:inline-flex;align-items:center;justify-content:center;font-weight:600;font-size:14px;flex-shrink:0}.empty-text{color:#555;font-size:13px;text-align:center;padding:16px}.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}.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:10px 12px;border-radius:10px;cursor:pointer;margin-bottom:2px}.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}.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}.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}.send-btn:hover{background:#1d4ed8}.app-layout{display:flex;height:100vh}*{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}