:root{--bg: #0b141a;--surface: #1f2c33;--surface-2: #2a3942;--accent: #00a884;--accent-hover: #06cf9c;--text: #e9edef;--muted: #8696a0;--danger: #f15c6d;--border: #2f3b43;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.center-screen{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:24px}.auth-card{width:100%;max-width:380px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px;box-shadow:0 12px 40px #0006}.brand{text-align:center;margin-bottom:20px}.brand .lock{font-size:34px}.brand h1{margin:6px 0 0;font-size:26px;letter-spacing:.5px}.subtitle{margin:2px 0 0;color:var(--muted);font-size:14px}.tabs{display:flex;gap:6px;background:var(--bg);border-radius:10px;padding:4px;margin-bottom:18px}.tab{flex:1;padding:9px;border:none;border-radius:8px;background:transparent;color:var(--muted);font-size:14px;font-weight:600;cursor:pointer;transition:all .15s}.tab.active{background:var(--surface-2);color:var(--text)}.auth-form{display:flex;flex-direction:column;gap:14px}.field{display:flex;flex-direction:column;gap:6px}.field>span{font-size:13px;color:var(--muted)}input[type=text],input[type=email],input[type=password]{width:100%;padding:11px 12px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:15px;outline:none}input:focus{border-color:var(--accent)}.field-error{color:var(--danger);font-size:12px}.checkbox{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text);cursor:pointer;-webkit-user-select:none;user-select:none}.checkbox input{width:16px;height:16px;accent-color:var(--accent)}.alert{background:#f15c6d1f;border:1px solid var(--danger);color:var(--danger);padding:10px 12px;border-radius:8px;font-size:13px}button.primary{padding:12px;border:none;border-radius:8px;background:var(--accent);color:#04231b;font-size:15px;font-weight:700;cursor:pointer;transition:background .15s}button.primary:hover:not(:disabled){background:var(--accent-hover)}button.primary:disabled{opacity:.6;cursor:not-allowed}.spinner{width:34px;height:34px;border:3px solid var(--surface-2);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border)}.topbar-brand{display:flex;align-items:center;gap:8px;font-size:18px}.topbar-user{display:flex;align-items:center;gap:12px}.avatar{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#04231b;display:flex;align-items:center;justify-content:center;font-weight:700}.username{font-size:14px}button.ghost{background:transparent;border:1px solid var(--border);color:var(--text);padding:7px 14px;border-radius:8px;cursor:pointer;font-size:13px}button.ghost:hover{background:var(--surface-2)}.home-main{flex:1;display:flex;align-items:flex-start;justify-content:center;padding:40px 20px}.welcome-card{width:100%;max-width:620px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px}.welcome-card h2{margin:0 0 4px}.muted{color:var(--muted)}.small{font-size:13px}.status-box{margin:20px 0;padding:16px;background:var(--bg);border-radius:12px;border:1px solid var(--border)}.status-box p{margin:0 0 8px;line-height:1.5}.status-box p:last-child{margin-bottom:0}.chat-placeholder{border:2px dashed var(--border);border-radius:12px;padding:40px;text-align:center}.chat-shell{height:100vh;display:grid;grid-template-columns:340px 1fr}.sidebar{background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--border)}.me-info{display:flex;flex-direction:column;line-height:1.2}.conn{font-size:11px}.conn.online{color:var(--accent-hover)}.conn.offline{color:var(--muted)}.new-chat-btn{margin:12px 14px;padding:10px;border:1px solid var(--accent);background:transparent;color:var(--accent-hover);border-radius:8px;font-weight:600;cursor:pointer}.new-chat-btn:hover{background:#00a8841a}.conv-list{overflow-y:auto;flex:1;min-height:0}.conv-empty{padding:20px 14px}.conv-item{display:flex;gap:10px;align-items:center;width:100%;padding:10px 14px;border:none;background:transparent;color:var(--text);cursor:pointer;text-align:left;border-bottom:1px solid var(--border)}.conv-item:hover,.conv-item.active{background:var(--surface-2)}.conv-item-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}.conv-item-top,.conv-item-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px}.conv-title{font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-preview{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.badge{background:var(--accent);color:#04231b;font-size:11px;font-weight:700;min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 5px}.avatar.small{width:28px;height:28px;font-size:13px}.main-area{min-width:0;display:flex;flex-direction:column;background:var(--bg)}.no-conversation{margin:auto;text-align:center;max-width:380px;padding:20px}.lock.big{font-size:56px}.thread{display:flex;flex-direction:column;height:100%;min-height:0}.thread-header{display:flex;align-items:center;gap:10px;padding:12px 18px;background:var(--surface);border-bottom:1px solid var(--border)}.thread-header-info{display:flex;flex-direction:column;line-height:1.2}.identity-warning{background:#f1b05c24;border-bottom:1px solid rgba(241,176,92,.5);color:#f1b05c;padding:10px 16px;font-size:13px;line-height:1.4}.messages{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:4px}.bubble-row{display:flex;justify-content:flex-start}.bubble-row.mine{justify-content:flex-end}.bubble{max-width:65%;background:var(--surface-2);padding:7px 10px 5px;border-radius:2px 10px 10px;position:relative}.bubble.mine{background:#005c4b;border-top-left-radius:10px;border-top-right-radius:2px}.bubble-body{display:block;white-space:pre-wrap;word-break:break-word;font-size:14.5px;line-height:1.35}.bubble-meta{display:flex;align-items:center;gap:4px;justify-content:flex-end;font-size:11px;color:var(--muted);margin-top:2px}.ticks{color:var(--muted);letter-spacing:-2px}.ticks.read{color:#53bdeb}.bubble.typing{display:flex;gap:4px;padding:12px}.dot{width:7px;height:7px;border-radius:50%;background:var(--muted);animation:blink 1.2s infinite}.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}@keyframes blink{0%,60%,to{opacity:.3}30%{opacity:1}}.composer{display:flex;gap:10px;padding:12px 16px;background:var(--surface);border-top:1px solid var(--border)}.composer input[type=text]{flex:1}button.send{padding:11px 18px}.attach-btn{background:transparent;border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:18px;width:44px;cursor:pointer}.attach-btn:hover:not(:disabled){background:var(--surface-2)}.attach-btn:disabled{opacity:.5;cursor:not-allowed}.composer-alert{margin:0 16px 8px}.attachment-image{display:block}.attachment-image img{max-width:260px;max-height:320px;border-radius:8px;display:block}.attachment-loading,.attachment-error{padding:24px 16px;font-size:13px;color:var(--muted);text-align:center}.attachment-file{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;background:#ffffff0f;color:var(--text);text-decoration:none;min-width:180px}.attachment-file:hover{background:#ffffff1f}.attachment-icon{font-size:22px}.attachment-info{display:flex;flex-direction:column;min-width:0}.attachment-info strong{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:200px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;align-items:center;justify-content:center;z-index:50}.modal{width:100%;max-width:420px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.modal-header h3{margin:0}.user-results{margin-top:12px;max-height:320px;overflow-y:auto;display:flex;flex-direction:column;gap:4px}.user-result{display:flex;align-items:center;gap:10px;padding:10px;border:none;background:transparent;color:var(--text);border-radius:8px;cursor:pointer;text-align:left}.user-result:hover{background:var(--surface-2)}.user-result-info{display:flex;flex-direction:column;line-height:1.3}