:root{--bg: #090d17;--bg-elevated: #101726;--bg-soft: #131d2f;--border: #263248;--text: #ecf1f9;--text-muted: #95a4bf;--primary: #4f7cff;--primary-hover: #3f6eeb;--danger: #7f1d1d;--danger-border: #b91c1c;--success: #14532d;--success-border: #22c55e;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--shadow: 0 16px 40px rgba(5, 8, 15, .35)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{font-family:Inter,Segoe UI,Roboto,sans-serif;color:var(--text);background:radial-gradient(circle at top,#1d2940 0%,var(--bg) 58%)}h2,h3,p{margin:0}.layout-root{width:100%;max-width:1600px;margin:0 auto;padding:var(--space-4)}.app-shell{display:grid;grid-template-columns:minmax(280px,340px) 1fr;min-height:calc(100vh - 32px);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;background:#0a0f19c7;box-shadow:var(--shadow)}.ui-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-elevated)}.ui-input{width:100%;border:1px solid var(--border);border-radius:var(--radius-md);background:#0a111f;color:var(--text);padding:11px 12px;font-size:.95rem}.ui-input:focus-visible{outline:2px solid rgba(79,124,255,.45);outline-offset:1px}.ui-button{border:1px solid transparent;border-radius:var(--radius-sm);color:#fff;background:var(--primary);cursor:pointer;transition:.18s ease;display:inline-flex;align-items:center;justify-content:center;gap:8px}.ui-button:disabled{opacity:.72;cursor:not-allowed}.ui-button--md{padding:10px 14px;font-size:.92rem}.ui-button--sm{padding:8px 10px;font-size:.82rem}.ui-button:hover{background:var(--primary-hover)}.ui-button:focus-visible{outline:2px solid rgba(79,124,255,.45);outline-offset:2px}.ui-button--ghost{color:var(--text);background:transparent;border-color:var(--border)}.ui-button--ghost:hover{background:#95a4bf1f}.ui-button--danger{background:var(--danger);border-color:var(--danger-border)}.ui-button--danger:hover{background:#991b1b}.ui-empty-state{border:1px dashed var(--border);border-radius:var(--radius-md);padding:var(--space-5);text-align:center;color:var(--text-muted)}.ui-empty-state strong{display:block;color:var(--text);margin-bottom:4px}.ui-spinner{display:inline-block;width:1.35rem;height:1.35rem;border:2px solid rgba(236,241,249,.2);border-top-color:var(--primary);border-radius:50%;animation:ui-spin .75s linear infinite;vertical-align:middle}.ui-spinner--sm{width:1rem;height:1rem;border-width:2px}.ui-spinner--lg{width:2rem;height:2rem;border-width:3px}@keyframes ui-spin{to{transform:rotate(360deg)}}.ui-loading-row{display:flex;align-items:center;justify-content:center;gap:var(--space-3);padding:var(--space-6);color:var(--text-muted);font-size:.9rem}.ui-error-state{border:1px solid var(--danger-border);border-radius:var(--radius-md);background:#7f1d1d59;padding:var(--space-4);text-align:center;display:flex;flex-direction:column;gap:var(--space-3);align-items:center}.ui-error-state strong{color:#fecaca}.ui-error-state .muted{margin:0;max-width:360px}.alert-banner{position:fixed;top:14px;left:50%;transform:translate(-50%);z-index:40;width:min(92vw,600px);padding:12px 14px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);border:1px solid}.alert-banner.success{background:var(--success);border-color:var(--success-border)}.alert-banner.error{background:var(--danger);border-color:#ef4444}.alert-banner button{border:0;border-radius:var(--radius-sm);background:#080a1166;color:inherit;cursor:pointer;padding:6px 10px}.sidebar{display:flex;flex-direction:column;border-right:1px solid var(--border);background:linear-gradient(180deg,#101726,#0d1423)}.sidebar-header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-4);border-bottom:1px solid var(--border)}.sidebar-header h2{font-size:1.05rem}.sidebar-actions{display:flex;gap:var(--space-2)}.chat-list{flex:1;overflow-y:auto;padding:var(--space-3);display:flex;flex-direction:column;gap:var(--space-2)}.chat-list-item{width:100%;border:1px solid transparent;border-radius:var(--radius-md);background:var(--bg-soft);color:inherit;text-align:left;padding:var(--space-3);cursor:pointer;transition:.16s ease}.chat-list-item:hover{border-color:#3b4a67;transform:translateY(-1px)}.chat-list-item.active{border-color:#496dbf;background:#1a2741}.chat-name{font-size:.92rem;font-weight:600;margin-bottom:7px}.participant-stack{display:flex;flex-wrap:wrap;gap:6px}.user-badge{display:inline-flex;align-items:center;gap:6px;font-size:.76rem;color:#cad3e4}.presence-dot{width:8px;height:8px;border-radius:999px}.presence-dot.online{background:#22c55e}.presence-dot.offline{background:#ef4444}.chat-window{display:flex;flex-direction:column;min-width:0}.chat-window.empty{align-items:center;justify-content:center;padding:var(--space-6)}.chat-window-header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);border-bottom:1px solid var(--border);padding:var(--space-4) var(--space-5)}.chat-window-header h3{font-size:1rem;margin-bottom:4px}.chat-header-actions{display:flex;align-items:center;gap:var(--space-3);color:var(--text-muted);font-size:.82rem}.message-list{flex:1;overflow-y:auto;padding:var(--space-5);display:flex;flex-direction:column;gap:var(--space-3)}.message-bubble{max-width:min(72%,680px);border:1px solid #2d3a53;background:#1a2539;border-radius:var(--radius-md);padding:10px 12px}.message-bubble.mine{align-self:flex-end;background:#2a4fba;border-color:#3d66da}.message-meta{display:flex;justify-content:space-between;gap:var(--space-3);font-size:.74rem;color:#c6d2e9}.message-bubble p{margin-top:8px;line-height:1.45;font-size:.9rem}.typing-indicator{min-height:24px;padding:0 var(--space-5);color:#a7b3ca;font-size:.82rem}.composer{display:flex;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-top:1px solid var(--border)}.composer .ui-input{flex:1}.auth-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-6)}.auth-card{width:min(440px,100%);padding:var(--space-6);display:flex;flex-direction:column;gap:var(--space-3)}.auth-title{margin-bottom:var(--space-2)}.auth-error{color:#fca5a5;font-size:.88rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:30;background:#070a11b8;display:flex;align-items:center;justify-content:center;padding:var(--space-5)}.modal-card{width:min(560px,100%);background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-4);display:flex;flex-direction:column;gap:var(--space-3)}.modal-card.compact{width:min(440px,100%)}.modal-header{display:flex;align-items:center;justify-content:space-between}.icon-button{border:0;background:transparent;color:var(--text);font-size:1.35rem;cursor:pointer}.user-picker-list{border:1px solid var(--border);border-radius:var(--radius-md);max-height:280px;overflow-y:auto;padding:var(--space-2);display:flex;flex-direction:column;gap:6px}.user-picker-item{display:grid;grid-template-columns:auto auto 1fr auto;align-items:center;gap:var(--space-2);padding:var(--space-2);border-radius:var(--radius-sm)}.user-picker-item:hover{background:#95a4bf1a}.modal-actions{display:flex;justify-content:flex-end;gap:var(--space-2)}.muted{color:var(--text-muted)}@media (max-width: 1024px){.layout-root{padding:var(--space-3)}.app-shell{grid-template-columns:300px 1fr;min-height:calc(100vh - 24px)}}@media (max-width: 768px){.app-shell{grid-template-columns:1fr;grid-template-rows:40vh 1fr}.sidebar{border-right:0;border-bottom:1px solid var(--border)}.message-bubble{max-width:92%}.chat-window-header{align-items:flex-start;flex-direction:column}.composer{padding:var(--space-3)}}