:root{--bg: #0f172a;--card: #1e293b;--accent: #6366f1;--accent-2: #818cf8;--mine: #6366f1;--theirs: #334155;--text: #e2e8f0;--muted: #94a3b8;--danger: #f43f5e}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:radial-gradient(1000px 600px at 15% -10%,#1e1b4b 0%,transparent 60%),radial-gradient(800px 500px at 110% 110%,#312e81 0%,transparent 55%),var(--bg);color:var(--text);display:flex;align-items:center;justify-content:center;padding:16px}.app{width:100%;max-width:560px;height:min(820px,100vh - 32px);background:var(--card);border:1px solid #334155;border-radius:16px;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 24px 60px #00000073}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid #334155;background:#1e293bcc}.brand{display:flex;align-items:center;gap:12px}.logo{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px;color:#fff}.brand h1{font-size:16px;font-weight:600}.online{font-size:12px;color:var(--muted)}.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#f59e0b;margin-right:4px}.status-dot.connected{background:#22c55e}.topbar-actions{display:flex;align-items:center;gap:8px}.current-user{font-size:13px;color:var(--accent-2);font-weight:600}.name-btn{background:transparent;border:1px solid #475569;color:var(--text);padding:6px 12px;border-radius:999px;font-size:12px;cursor:pointer;transition:border-color .2s,background .2s}.name-btn:hover{border-color:var(--accent-2);background:#6366f11a}.messages{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:10px;scroll-behavior:smooth}.msg{display:flex;flex-direction:column;max-width:80%;animation:pop .2s ease}@keyframes pop{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.msg.mine{align-self:flex-end;align-items:flex-end}.msg.theirs{align-self:flex-start;align-items:flex-start}.msg .meta{font-size:11px;color:var(--muted);margin-bottom:4px;padding:0 4px}.msg .bubble{padding:10px 14px;border-radius:16px;line-height:1.5;word-break:break-word;font-size:14px}.msg.mine .bubble{background:linear-gradient(135deg,var(--mine),var(--accent-2));color:#fff;border-bottom-right-radius:4px}.msg.theirs .bubble{background:var(--theirs);border-bottom-left-radius:4px}.msg .time{font-size:10px;color:var(--muted);margin-top:4px;padding:0 4px}.sys{align-self:center;background:#94a3b826;color:var(--muted);font-size:12px;padding:5px 14px;border-radius:999px;margin:4px 0;animation:pop .2s ease}.composer{display:flex;gap:10px;padding:14px 16px;border-top:1px solid #334155;background:#1e293bcc}.composer input{flex:1;background:#0f172a;border:1px solid #334155;border-radius:999px;padding:11px 18px;color:var(--text);font-size:14px;outline:none;transition:border-color .2s}.composer input:focus{border-color:var(--accent)}.composer input::placeholder{color:var(--muted)}.send-btn{background:linear-gradient(135deg,var(--accent),var(--accent-2));border:none;color:#fff;font-weight:600;font-size:14px;padding:0 22px;border-radius:999px;cursor:pointer;transition:opacity .2s,transform .1s}.send-btn:hover{opacity:.9}.send-btn:active{transform:scale(.96)}.login-view{width:100%;max-width:400px}.login-card{background:var(--card);border:1px solid #334155;border-radius:16px;padding:36px 32px;text-align:center;box-shadow:0 24px 60px #00000073}.login-logo{width:56px;height:56px;margin:0 auto 16px;border-radius:16px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:flex;align-items:center;justify-content:center;font-weight:700;font-size:26px;color:#fff}.login-card h1{font-size:22px;font-weight:600;margin-bottom:4px}.login-sub{color:var(--muted);font-size:14px;margin-bottom:28px}.login-card form{display:flex;flex-direction:column;gap:6px;text-align:left}.login-card label{font-size:13px;color:var(--muted);margin-top:6px}.login-card input{background:#0f172a;border:1px solid #334155;border-radius:10px;padding:12px 16px;color:var(--text);font-size:14px;outline:none;transition:border-color .2s}.login-card input:focus{border-color:var(--accent)}.login-btn{margin-top:20px;background:linear-gradient(135deg,var(--accent),var(--accent-2));border:none;color:#fff;font-weight:600;font-size:15px;padding:12px;border-radius:10px;cursor:pointer;transition:opacity .2s,transform .1s}.login-btn:hover{opacity:.9}.login-btn:active{transform:scale(.98)}.login-btn:disabled{opacity:.6;cursor:not-allowed}.login-error{color:var(--danger);font-size:13px;text-align:center;margin-top:12px}.login-hint{margin-top:24px;color:var(--muted);font-size:12px;line-height:1.8}.login-hint code{background:#0f172a;border:1px solid #334155;border-radius:4px;padding:1px 6px;color:var(--accent-2)}.toast{position:fixed;top:20px;left:50%;transform:translate(-50%);background:#0f172a;border:1px solid #475569;color:var(--text);padding:10px 20px;border-radius:10px;font-size:14px;z-index:100;box-shadow:0 8px 24px #0006;animation:pop .2s ease}.messages::-webkit-scrollbar{width:6px}.messages::-webkit-scrollbar-thumb{background:#475569;border-radius:3px}.messages::-webkit-scrollbar-track{background:transparent}@media (max-width: 480px){body{padding:0}.app{height:100vh;max-height:none;border-radius:0;border:none}}