*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#dbeafe;--danger:#dc2626;--bg:#f9fafb;--surface:#fff;--border:#e5e7eb;--text:#111827;--text-sub:#6b7280;--bubble-mine:#2563eb;--bubble-mine-text:#fff;--bubble-theirs:#fff;--bubble-theirs-text:#111827;--nav-h:60px;--header-h:56px;--radius:12px;--radius-sm:8px}@media (prefers-color-scheme:dark){:root{--bg:#0f172a;--surface:#1e293b;--border:#334155;--text:#f1f5f9;--text-sub:#94a3b8;--bubble-theirs:#1e293b;--bubble-theirs-text:#f1f5f9}}html,body{background:var(--bg);height:100%;color:var(--text);-webkit-tap-highlight-color:transparent;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px}#root{height:100%}a{color:var(--primary);text-decoration:none}button{cursor:pointer;font:inherit;color:inherit;background:0 0;border:none}input,textarea{font:inherit;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);outline:none;width:100%;padding:10px 12px;transition:border-color .15s}input:focus,textarea:focus{border-color:var(--primary)}.app-layout{background:var(--bg);flex-direction:column;max-width:480px;height:100%;margin:0 auto;display:flex;position:relative}.main-content{padding-bottom:var(--nav-h);flex:1;overflow:hidden auto}.page{flex-direction:column;min-height:100%;display:flex}.bottom-nav{width:100%;max-width:480px;height:var(--nav-h);background:var(--surface);border-top:1px solid var(--border);z-index:100;padding-bottom:env(safe-area-inset-bottom);display:flex;position:fixed;bottom:0;left:50%;transform:translate(-50%)}.nav-item{color:var(--text-sub);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:2px;padding:6px 0;font-size:11px;text-decoration:none;transition:color .15s;display:flex}.nav-item.active{color:var(--primary)}.nav-icon{font-size:22px;line-height:1}.page-header{height:var(--header-h);background:var(--surface);border-bottom:1px solid var(--border);z-index:10;justify-content:space-between;align-items:center;padding:0 16px;display:flex;position:sticky;top:0}.page-header h2{font-size:18px;font-weight:600}.btn-icon-text{color:var(--primary);font-size:15px;font-weight:500}.search-bar{background:var(--surface);border-bottom:1px solid var(--border);padding:10px 16px}.search-bar input{background:var(--bg)}.list{flex:1}.list-item{background:var(--surface);border-bottom:1px solid var(--border);cursor:pointer;align-items:center;gap:12px;padding:12px 16px;transition:background .1s;display:flex}.list-item:active{background:var(--bg)}.list-item-body{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.list-item-row{justify-content:space-between;align-items:center;display:flex}.list-item-name{text-overflow:ellipsis;white-space:nowrap;font-size:15px;font-weight:500;overflow:hidden}.list-item-sub{color:var(--text-sub);font-size:13px}.list-item-preview{color:var(--text-sub);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:13px;overflow:hidden}.list-item-time{color:var(--text-sub);white-space:nowrap;margin-left:8px;font-size:12px}.avatar{background:var(--primary-light);width:46px;height:46px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:18px;font-weight:600;display:flex;position:relative;overflow:hidden}.avatar img{object-fit:cover;width:100%;height:100%}.avatar-badge{background:var(--primary);color:#fff;border-radius:4px;padding:1px 3px;font-size:9px;position:absolute;bottom:0;right:0}.badge{background:var(--danger);color:#fff;text-align:center;border-radius:10px;min-width:18px;padding:1px 6px;font-size:12px;font-weight:600}.empty-state{color:var(--text-sub);flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:60px 20px;display:flex}.empty-hint{font-size:13px}.btn-primary{background:var(--primary);color:#fff;border-radius:var(--radius-sm);padding:10px 18px;font-weight:500;transition:background .15s}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-danger{background:var(--danger);color:#fff;border-radius:var(--radius-sm);padding:10px 18px;font-weight:500}.btn-full{width:100%}.btn-sm{border:1px solid var(--border);background:var(--surface);white-space:nowrap;border-radius:6px;padding:5px 12px;font-size:13px;font-weight:500}.btn-sm.btn-primary{border-color:var(--primary);background:var(--primary);color:#fff}.btn-sm.btn-danger{border-color:var(--danger);background:var(--danger);color:#fff}.btn-group{gap:6px;display:flex}.icon-btn{width:36px;height:36px;color:var(--text-sub);border-radius:50%;justify-content:center;align-items:center;font-size:18px;display:flex}.icon-btn:active{background:var(--bg)}.form-group{flex-direction:column;gap:6px;margin-bottom:14px;display:flex}.form-group label{color:var(--text-sub);font-size:13px;font-weight:500}.form-error{color:var(--danger);padding:4px 0;font-size:13px}.auth-container{background:var(--bg);justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.auth-card{background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);width:100%;max-width:380px;padding:32px 24px}.auth-logo{text-align:center;margin-bottom:28px}.auth-logo-icon{font-size:48px}.auth-logo h1{margin-top:8px;font-size:24px;font-weight:700}.auth-logo p{color:var(--text-sub);margin-top:4px;font-size:14px}.auth-form{flex-direction:column;display:flex}.auth-switch{text-align:center;color:var(--text-sub);margin-top:20px;font-size:14px}.chat-page{flex-direction:column;max-width:480px;height:100vh;margin:0 auto;display:flex}.chat-header{height:var(--header-h);background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:10px;padding:0 12px;display:flex}.chat-header-info{flex:1;min-width:0}.chat-header-name{font-size:16px;font-weight:600}.chat-messages{flex-direction:column;flex:1;gap:8px;padding:12px 12px 8px;display:flex;overflow-y:auto}.chat-input-area{padding:10px 12px;padding-bottom:max(10px, env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--border);flex-shrink:0;align-items:flex-end;gap:6px;display:flex}.chat-input{resize:none;border-radius:20px;flex:1;min-height:38px;max-height:120px;padding:8px 14px;font-size:15px;line-height:1.4;overflow-y:auto}.btn-send{background:var(--primary);color:#fff;white-space:nowrap;border-radius:20px;flex-shrink:0;padding:8px 16px;font-size:14px;font-weight:500}.btn-send:disabled{opacity:.5}.msg-row{align-items:flex-end;gap:8px;display:flex}.msg-row.mine{flex-direction:row-reverse}.msg-avatar{background:var(--primary-light);width:32px;height:32px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:600;display:flex;overflow:hidden}.msg-avatar img{object-fit:cover;width:100%;height:100%}.msg-bubble-wrap{flex-direction:column;gap:3px;max-width:72%;display:flex}.msg-row.mine .msg-bubble-wrap{align-items:flex-end}.msg-sender{color:var(--text-sub);padding-left:4px;font-size:12px}.msg-bubble{word-break:break-word;border-radius:18px;padding:9px 14px}.bubble-mine{background:var(--bubble-mine);color:var(--bubble-mine-text);border-bottom-right-radius:4px}.bubble-theirs{background:var(--bubble-theirs);color:var(--bubble-theirs-text);border:1px solid var(--border);border-bottom-left-radius:4px}.msg-text{white-space:pre-wrap;font-size:15px;line-height:1.45}.msg-meta{align-items:center;gap:4px;padding:0 4px;display:flex}.msg-time{color:var(--text-sub);font-size:11px}.msg-status{color:var(--text-sub);font-size:12px}.msg-status.delivered{color:var(--primary)}.msg-status.failed{color:var(--danger)}.msg-image{cursor:pointer;object-fit:cover;border-radius:12px;max-width:220px;max-height:280px;display:block}.msg-file{color:inherit;align-items:center;gap:10px;padding:2px 0;text-decoration:none;display:flex}.msg-file-icon{font-size:24px}.msg-file-info{flex-direction:column;gap:2px;display:flex}.msg-file-name{text-overflow:ellipsis;white-space:nowrap;max-width:140px;font-size:14px;font-weight:500;overflow:hidden}.msg-file-size{opacity:.7;font-size:12px}.menu-overlay{z-index:200;background:#0000004d;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.context-menu{background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);min-width:160px;overflow:hidden}.context-menu button{text-align:left;border-bottom:1px solid var(--border);width:100%;padding:14px 20px;font-size:15px;display:block}.context-menu button:last-child{border-bottom:none}.context-menu button.danger{color:var(--danger)}.tab-bar{background:var(--surface);border-bottom:1px solid var(--border);display:flex}.tab{text-align:center;color:var(--text-sub);cursor:pointer;background:0 0;border:none;flex:1;justify-content:center;align-items:center;gap:4px;padding:12px 8px;font-size:14px;font-weight:500;display:flex}.tab.active{color:var(--primary);border-bottom:2px solid var(--primary)}.search-section{padding:12px 16px}.search-input-row{gap:8px;margin-bottom:12px;display:flex}.search-input-row input{flex:1}.search-input-row .btn-primary{border-radius:var(--radius-sm);flex-shrink:0;padding:10px 16px}.modal-overlay{z-index:200;background:#0006;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.modal{background:var(--surface);border-radius:var(--radius) var(--radius) 0 0;width:100%;max-width:480px;max-height:80vh;padding:24px 20px;overflow-y:auto}.modal h3{margin-bottom:16px;font-size:17px;font-weight:600}.modal input{margin-bottom:12px}.modal-actions{gap:10px;margin-top:16px;display:flex}.modal-actions .btn-primary{flex:1}.profile-card{background:var(--surface);border-bottom:1px solid var(--border);align-items:center;gap:16px;padding:24px 16px;display:flex}.profile-avatar{background:var(--primary-light);width:72px;height:72px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:28px;font-weight:700;display:flex;overflow:hidden}.profile-avatar img{object-fit:cover;width:100%;height:100%}.profile-info{flex:1}.profile-info h3{font-size:18px;font-weight:600}.profile-uid{color:var(--text-sub);margin-top:4px;font-size:13px}.profile-username{color:var(--text-sub);margin-top:2px;font-size:13px}.settings-list{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-top:12px}.settings-item{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 16px;font-size:15px;display:flex}.settings-item:last-child{border-bottom:none}.settings-value{color:var(--text-sub);font-size:13px}.profile-actions{padding:20px 16px}