:root{--bg:#eef1f5;--bg-alt:#e2e7f0;--card:#fff;--card-soft:#f7f9fc;--border-subtle:rgba(148,163,184,.4);--border-strong:rgba(15,23,42,.18);--text:#111827;--muted:#6b7280;--accent:#22c55e;--accent-strong:#16a34a;--accent-soft:rgba(34,197,94,.14);--danger:#ef4444;--radius-lg:18px;--radius-md:12px;--radius-pill:999px;--shadow-soft:0 12px 28px rgba(15,23,42,.08)}*,:after,:before{box-sizing:border-box}body,html{padding:0;margin:0;height:100%;font-family:system-ui,-apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,sans-serif}body{color:var(--text);background:linear-gradient(135deg,#eef2ff,#eef1f5 40%,#e5e7eb)}button,input{font-family:inherit}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:rgba(148,163,184,.6);border-radius:999px}.landing-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:32px 16px}.auth-panel{width:min(460px,100%);background:var(--card);border-radius:20px;padding:30px 26px 26px;border:1px solid var(--border-subtle);box-shadow:var(--shadow-soft)}.auth-panel h1{margin:0 0 6px;font-size:26px;letter-spacing:.02em}.auth-subtitle{margin:0 0 22px;font-size:14px;color:var(--muted)}.field-label{display:block;margin-bottom:6px;font-size:13px;color:#4b5563}.auth-panel input{width:100%;border-radius:10px;border:1px solid var(--border-subtle);padding:11px 13px;background:#f3f4f6;color:var(--text);font-size:14px;outline:none}.auth-panel input::placeholder{color:#9ca3af}.auth-panel input:focus{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-soft)}.primary-btn{margin-top:18px;width:100%;border-radius:999px;border:none;background:linear-gradient(135deg,var(--accent),var(--accent-strong));color:#ecfdf5;font-weight:600;font-size:15px;padding:10px 16px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center}.primary-btn:hover{filter:brightness(1.03)}.primary-btn:active{transform:translateY(1px)}.error-text{margin-top:8px;font-size:13px;color:var(--danger)}.auth-hint{margin-top:12px;font-size:12px;color:var(--muted)}.app-root{min-height:100vh;display:flex;flex-direction:column}.navbar{height:68px;padding:0 32px;justify-content:space-between;border-bottom:1px solid var(--border-subtle);background:rgba(248,250,252,.96);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);position:-webkit-sticky;position:sticky;top:0;z-index:20;box-shadow:0 10px 25px rgba(15,23,42,.08)}.nav-left,.navbar{display:flex;align-items:center}.nav-left{gap:10px}.logo-badge{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--accent),#4ade80);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;color:#022c22;box-shadow:0 8px 18px rgba(16,185,129,.45)}.brand-block{display:flex;flex-direction:column;gap:2px}.brand{font-size:18px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#111827}.brand-sub{font-size:11px;color:var(--muted)}.nav-right{display:flex;align-items:center;gap:16px}.connection-pill{display:inline-flex;align-items:center;gap:7px;padding:6px 11px;border-radius:999px;border:1px solid rgba(148,163,184,.5);background:#f9fafb;font-size:11px;color:var(--muted)}.status-dot{width:8px;height:8px;border-radius:999px}.status-dot.online{background:#22c55e}.status-dot.offline{background:#f97316}.user-pill{display:inline-flex;align-items:center;gap:10px;padding:5px 12px 5px 6px;border-radius:999px;background:#f9fafb;border:1px solid rgba(148,163,184,.7)}.avatar{width:28px;height:28px;border-radius:999px;background:linear-gradient(135deg,#22c55e,#16a34a);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#ecfdf5}.user-meta{display:flex;flex-direction:column}.user-name{font-size:13px;color:#111827}.link-btn{margin:0;padding:0;border:none;background:none;color:#6b7280;font-size:11px;text-align:left;cursor:pointer}.link-btn:hover{color:#111827;text-decoration:underline}.shell{flex:1 1;max-width:1200px;width:100%;margin:0 auto;padding:20px 20px 26px;display:flex;gap:18px}.chatlist{width:280px;background:var(--card);border-radius:var(--radius-lg);padding:14px;border:1px solid var(--border-subtle);display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow-soft)}.rooms-header{display:flex;justify-content:space-between;align-items:center;gap:10px}.rooms-header h3{margin:0;font-size:15px}.room-search{flex:1 1;border-radius:999px;border:1px solid var(--border-subtle);padding:6px 10px;font-size:12px;background:#f3f4f6;color:var(--text)}.room-search::placeholder{color:#9ca3af}.rooms{display:flex;flex-direction:column;gap:7px;margin-top:6px}.room{border-radius:999px;border:1px solid transparent;padding:8px 12px;font-size:13px;color:var(--muted);background:var(--card-soft);display:flex;align-items:center;justify-content:space-between;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease}.room:hover{border-color:var(--border-subtle);background:#edf1f7}.room.active{background:linear-gradient(135deg,var(--accent),var(--accent-strong));color:#ecfdf5;font-weight:600}.room-meta{display:inline-flex;align-items:center;gap:4px;font-size:11px}.room-dot{width:6px;height:6px;border-radius:999px;background:rgba(148,163,184,.8)}.new-room{margin-top:auto;padding-top:10px;border-top:1px solid var(--border-subtle);display:flex;gap:6px}.new-room input{flex:1 1;border-radius:999px;border:1px solid var(--border-subtle);background:#f3f4f6;padding:8px 10px;font-size:13px;color:var(--text)}.new-room input::placeholder{color:#9ca3af}.new-room button{border-radius:999px;border:none;background:var(--accent);color:#ecfdf5;font-size:12px;padding:0 12px;font-weight:600;cursor:pointer}.new-room button:hover{background:var(--accent-strong)}.empty-text{font-size:12px;color:var(--muted)}.chat-window{flex:1 1;background:var(--card);border-radius:var(--radius-lg);padding:16px 16px 12px;border:1px solid var(--border-subtle);display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow-soft)}.chat-window.empty{font-size:14px;color:var(--muted)}.chat-window.empty,.chat-window.intro{display:flex;align-items:center;justify-content:center}.intro-wrapper{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);grid-gap:20px;gap:20px;max-width:820px;width:100%}.intro-main,.intro-side{position:relative;background:var(--card-soft);border-radius:var(--radius-md);padding:18px 18px 16px;border:1px solid var(--border-subtle)}.intro-main h2{margin:0 0 6px;font-size:19px}.intro-text{margin:0 0 10px;font-size:13px;color:var(--muted)}.intro-list{margin:0;padding-left:18px;font-size:13px}.intro-list li+li{margin-top:4px}.intro-side h3{margin:0 0 8px;font-size:15px}.intro-side ol{margin:0;padding-left:18px;font-size:13px}.intro-side ol li+li{margin-top:4px}.intro-footnote{margin-top:10px;font-size:12px;color:var(--muted)}.chat-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:4px}.chat-header h2{margin:0;font-size:16px}.chat-subtitle{margin:2px 0 0;font-size:12px;color:var(--muted)}.chip-row{display:flex;flex-wrap:wrap;gap:6px;justify-content:flex-end}.user-chip{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;border-radius:999px;background:#f3f4f6;border:1px solid var(--border-subtle);font-size:11px;color:var(--muted)}.chip-avatar{width:18px;height:18px;border-radius:999px;background:#dcfce7;display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:600;color:#16a34a}.chip-name{max-width:120px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.messages{flex:1 1;overflow-y:auto;padding-right:4px;display:flex;flex-direction:column;gap:10px}.messages-empty{display:flex;align-items:center;justify-content:center}.message{background:#f3f4f6;border-radius:14px;padding:8px 11px;max-width:72%;border:1px solid rgba(209,213,219,.8)}.message.self{align-self:flex-end;background:linear-gradient(135deg,var(--accent),var(--accent-strong));color:#ecfdf5;border-color:transparent}.message .meta{display:flex;gap:6px;align-items:center;font-size:11px;opacity:.85}.message .time{opacity:.7}.message .body{margin-top:4px;font-size:14px}.empty-room-tip{max-width:420px;text-align:center;color:var(--muted)}.empty-room-tip h3{margin:0 0 6px;font-size:18px}.empty-room-tip p{margin:4px 0;font-size:13px}.empty-room-tip ul{margin:10px 0;padding-left:18px;text-align:left;font-size:13px}.empty-room-footer{margin-top:6px;font-size:12px}.message-input{display:flex;gap:8px;margin-top:4px}.message-input input{flex:1 1;border-radius:999px;border:1px solid var(--border-subtle);background:#f3f4f6;padding:9px 12px;color:var(--text);font-size:14px}.message-input input::placeholder{color:#9ca3af}.message-input input:disabled{opacity:.6;cursor:not-allowed}.message-input button{border-radius:999px;border:none;background:var(--accent);color:#ecfdf5;padding:8px 16px;font-size:14px;font-weight:600;cursor:pointer}.message-input button:hover{background:var(--accent-strong)}.message-input button:disabled{opacity:.6;cursor:not-allowed}.typing-indicator{font-size:12px;color:var(--muted)}@media (max-width:900px){.shell{flex-direction:column}.chatlist{width:100%}.navbar{padding-inline:18px}}