:root{--bg: #f0f2f5;--panel: #ffffff;--border: #e9edef;--text: #111b21;--text-muted: #667781;--accent: #00a884;--accent-dark: #008069;--bubble-mine: #d9fdd3;--bubble-theirs: #ffffff;--danger: #e53935;color-scheme:light}@media (prefers-color-scheme: dark){:root{--bg: #0b141a;--panel: #111b21;--border: #222d34;--text: #e9edef;--text-muted: #8696a0;--accent: #00a884;--accent-dark: #06cf9c;--bubble-mine: #005c4b;--bubble-theirs: #202c33;color-scheme:dark}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}button{font-family:inherit;cursor:pointer}input,textarea{font-family:inherit}.auth-screen{height:100%;display:flex;align-items:center;justify-content:center;padding:16px}.auth-card{width:100%;max-width:380px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:28px}.auth-card h1{font-size:1.3rem;margin:0 0 4px}.auth-card p.subtitle{color:var(--text-muted);margin:0 0 20px;font-size:.9rem}.field{margin-bottom:14px}.field label{display:block;font-size:.8rem;color:var(--text-muted);margin-bottom:4px}.field input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);font-size:.95rem}.field input:focus{outline:2px solid var(--accent);outline-offset:-1px}.btn-primary{width:100%;padding:11px;border:none;border-radius:8px;background:var(--accent);color:#fff;font-weight:600;font-size:.95rem}.btn-primary:hover{background:var(--accent-dark)}.btn-primary:disabled{opacity:.6;cursor:default}.btn-link{background:none;border:none;color:var(--accent-dark);font-size:.85rem;padding:0}.auth-switch{text-align:center;margin-top:16px;font-size:.85rem;color:var(--text-muted)}.error-banner{background:#fdecea;color:var(--danger);padding:8px 12px;border-radius:8px;font-size:.85rem;margin-bottom:14px}.tabs{display:flex;gap:4px;margin-bottom:20px;background:var(--bg);border-radius:8px;padding:3px}.tabs button{flex:1;padding:8px;border:none;background:transparent;border-radius:6px;font-size:.85rem;color:var(--text-muted)}.tabs button.active{background:var(--panel);color:var(--text);font-weight:600}.app-shell{height:100%;display:grid;grid-template-columns:minmax(280px,380px) 1fr}@media (max-width: 720px){.app-shell{grid-template-columns:1fr}.app-shell[data-view=chat] .sidebar,.app-shell[data-view=list] .chat-panel{display:none}}.sidebar{background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;min-width:0}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}.sidebar-header .who{display:flex;align-items:center;gap:10px;min-width:0}.sidebar-header .who .name{font-weight:600;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.icon-btn{border:none;background:transparent;font-size:1.1rem;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--text-muted)}.icon-btn:hover{background:var(--bg)}.conversation-list{flex:1;overflow-y:auto}.conversation-item{display:flex;gap:12px;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer}.conversation-item:hover,.conversation-item.active{background:var(--bg)}.conversation-item .meta{flex:1;min-width:0}.conversation-item .row1{display:flex;justify-content:space-between;gap:8px}.conversation-item .row1 .name{font-weight:600;font-size:.92rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation-item .row1 .time{font-size:.72rem;color:var(--text-muted);flex-shrink:0}.conversation-item .row2{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:2px}.conversation-item .preview{font-size:.83rem;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.unread-badge{background:var(--accent);color:#fff;border-radius:999px;font-size:.7rem;min-width:18px;height:18px;display:flex;align-items:center;justify-content:center;padding:0 5px;flex-shrink:0}.empty-state{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-muted);text-align:center;padding:24px;font-size:.9rem}.chat-panel{display:flex;flex-direction:column;min-width:0;background:var(--bg)}.chat-header{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border)}.chat-header .back-btn{display:none}@media (max-width: 720px){.chat-header .back-btn{display:flex}}.chat-header .info .name{font-weight:600;font-size:.95rem}.chat-header .info .status{font-size:.75rem;color:var(--text-muted)}.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:4px}.e2ee-banner{align-self:center;background:#00a8841f;color:var(--accent-dark);font-size:.75rem;padding:6px 12px;border-radius:8px;margin-bottom:8px;text-align:center;max-width:480px}.bubble-row{display:flex}.bubble-row.mine{justify-content:flex-end}.bubble{max-width:min(60ch,80%);padding:7px 10px;border-radius:9px;font-size:.9rem;line-height:1.35;box-shadow:0 1px .5px #00000014;word-wrap:break-word;white-space:pre-wrap}.bubble.theirs{background:var(--bubble-theirs);border-top-left-radius:2px}.bubble.mine{background:var(--bubble-mine);border-top-right-radius:2px}.bubble .meta{display:flex;justify-content:flex-end;gap:4px;margin-top:3px;font-size:.68rem;color:var(--text-muted)}.bubble .decrypt-error{color:var(--danger);font-style:italic}.composer{display:flex;align-items:flex-end;gap:8px;padding:10px 16px;background:var(--panel);border-top:1px solid var(--border)}.composer textarea{flex:1;resize:none;border:1px solid var(--border);border-radius:20px;padding:10px 16px;max-height:120px;background:var(--bg);color:var(--text);font-size:.92rem}.composer textarea:focus{outline:none}.composer .send-btn{width:40px;height:40px;border-radius:50%;border:none;background:var(--accent);color:#fff;font-size:1.1rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.composer .send-btn:disabled{opacity:.5}.typing-indicator{font-size:.78rem;color:var(--accent-dark);padding:2px 16px 6px;font-style:italic}.avatar{width:40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.95rem;flex-shrink:0}.presence-dot{width:8px;height:8px;border-radius:50%;background:#ccc;display:inline-block;margin-right:4px}.presence-dot.online{background:var(--accent)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:10;padding:16px}.modal-card{background:var(--panel);border-radius:12px;padding:20px;width:100%;max-width:380px}.modal-card h2{margin:0 0 12px;font-size:1.05rem}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}.btn-secondary{padding:9px 14px;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--text);font-size:.9rem}.result-card{display:flex;align-items:center;gap:10px;padding:10px;border:1px solid var(--border);border-radius:8px;margin-top:10px}.result-card .name{flex:1;font-size:.9rem}