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1fr;gap:1.25rem;align-items:flex-start;margin-top:1rem}.rooms-sidebar{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden}.rooms-section{padding:1rem;border-bottom:1px solid var(--border-color)}.rooms-section:last-child{border-bottom:none}.rooms-heading{font-size:.72rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.8px;margin:0 0 .6rem}.rooms-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}.room-btn{display:block;width:100%;text-align:left;background:none;border:none;color:var(--text-secondary);padding:.45rem .6rem;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;cursor:pointer;transition:background .15s,color .15s}.room-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.room-btn.active{background:#58a6ff1f;color:var(--accent-blue)}.custom-room-form{display:flex;gap:.4rem}.custom-room-input{flex:1;height:32px;padding:0 .6rem;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-size:.8rem;outline:none;transition:border-color .2s}.custom-room-input:focus{border-color:var(--accent-blue)}.custom-room-input::placeholder{color:var(--text-muted)}.empty-page{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:4rem 2rem;color:var(--text-secondary);text-align:center}.empty-icon{font-size:3rem;color:var(--text-muted)}@media (max-width: 640px){.chat-layout{grid-template-columns:1fr}.rooms-sidebar{display:flex;overflow-x:auto;flex-direction:row}.rooms-section{border-bottom:none;border-right:1px solid var(--border-color);flex-shrink:0}.chat-page{padding:1rem 1rem 2rem}}.login-page{min-height:calc(100vh - 60px);display:flex;align-items:center;justify-content:center;padding:2rem}.login-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:2.5rem 2rem;width:100%;max-width:400px;text-align:center;box-shadow:var(--shadow-lg)}.login-logo{font-size:3rem;margin-bottom:.75rem}.login-title{font-size:1.5rem;font-weight:800;color:var(--text-primary);margin:0 0 .5rem}.login-sub{color:var(--text-secondary);font-size:.9rem;margin:0 0 1.75rem}.login-form{display:flex;flex-direction:column;gap:1rem;text-align:left}.form-group{display:flex;flex-direction:column;gap:.4rem}.form-label{font-size:.875rem;font-weight:500;color:var(--text-secondary)}.form-input{height:44px;padding:0 1rem;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;outline:none;transition:border-color .2s}.form-input:focus{border-color:var(--accent-blue);box-shadow:0 0 0 3px #58a6ff26}.form-input.invalid{border-color:var(--accent-red)}.form-input::placeholder{color:var(--text-muted)}.form-error{color:var(--accent-red);font-size:.8rem;margin:0}.login-note{color:var(--text-muted);font-size:.78rem;margin-top:1.25rem}