:root{--bg-primary:#0e1621;--bg-secondary:#17212b;--bg-tertiary:#1e2c3a;--bg-hover:#242f3d;--bg-active:#2b5278;--bg-user-bubble:#2b5278;--bg-assistant-bubble:#182533;--text-primary:#f5f5f5;--text-secondary:#8b9dab;--text-muted:#6b7d8d;--accent:#5eb5f7;--accent-hover:#4da0e0;--border:#1e2c3a;--danger:#e74c3c;--radius:10px;--radius-sm:6px;--sidebar-width:320px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-primary);color:var(--text-primary);height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;overflow:hidden}.auth-body{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;display:flex}.auth-card{background:var(--bg-secondary);border-radius:12px;width:100%;max-width:400px;margin:1rem;padding:2.5rem 2rem}.auth-brand{flex-direction:column;align-items:center;gap:.5rem;display:flex}.auth-logo{border-radius:12px}.auth-title{text-align:center;color:var(--accent);margin-bottom:.25rem;font-size:2rem}.auth-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:1.5rem}.auth-error{color:var(--danger);border-radius:var(--radius-sm);background:#e74c3c26;margin-bottom:1rem;padding:.75rem 1rem;font-size:.875rem}.auth-form{flex-direction:column;gap:.75rem;display:flex}.auth-form input[type=text],.auth-form input[type=email],.auth-form input[type=password]{background:var(--bg-tertiary);border:1px solid var(--border);color:var(--text-primary);border-radius:var(--radius-sm);outline:none;padding:.75rem 1rem;font-size:1rem;transition:border-color .2s}.auth-form input:focus{border-color:var(--accent)}.auth-form button{background:var(--accent);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;padding:.75rem;font-size:1rem;font-weight:600;transition:background 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.2s;display:flex}.user-menu-trigger:hover{background:var(--bg-hover)}.user-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.user-menu-arrow{opacity:.6;margin-left:.5rem;font-size:.65rem;transition:transform .2s}.user-menu-dropdown.open+.user-menu-arrow,.user-menu-dropdown.open~.user-menu-arrow{transform:rotate(180deg)}.user-menu-dropdown{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);z-index:50;padding:.25rem;display:none;position:absolute;bottom:calc(100% + 4px);left:0;right:0;box-shadow:0 -4px 16px #0000004d}.user-menu-dropdown.open{display:block}.user-menu-item{width:100%;color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:4px;align-items:center;gap:.5rem;padding:.5rem .75rem;font-family:inherit;font-size:.85rem;text-decoration:none;transition:background .15s,color 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