:root{--bg-void: #07080a;--bg-base: #0d0f12;--bg-panel: #131519;--bg-hover: #1a1d22;--bg-active: #1e2128;--border: rgba(255,255,255,.07);--border-hi: rgba(255,255,255,.13);--accent: #5b8af0;--accent-dim: rgba(91,138,240,.15);--accent-glow: rgba(91,138,240,.35);--accent-muted: rgba(91,138,240,.5);--green: #3ecf8e;--green-dim: rgba(62,207,142,.15);--red: #f05b5b;--red-dim: rgba(240,91,91,.12);--amber: #f0b95b;--text-hi: #eceef2;--text-main: #b8bcc8;--text-muted: #5c6070;--text-dim: #363a44;--msg-me: #1e3a6e;--msg-them: #161920;--msg-me-border: rgba(91,138,240,.25);--msg-them-border: rgba(255,255,255,.06);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--mono: "Space Mono", monospace;--sans: "DM Sans", system-ui, sans-serif;--sidebar-w: 320px;--header-h: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;width:100%;background:var(--bg-void);color:var(--text-main);font-family:var(--sans);font-size:14px;line-height:1.5;overflow:hidden;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-hi);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}#setup-screen{position:fixed;inset:0;background:var(--bg-void);z-index:1000;display:flex;align-items:center;justify-content:center;background-image:linear-gradient(rgba(91,138,240,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(91,138,240,.04) 1px,transparent 1px);background-size:40px 40px}.auth-card{background:var(--bg-panel);border:1px solid var(--border-hi);border-radius:var(--radius-xl);padding:48px 40px;width:min(420px,92vw);display:flex;flex-direction:column;align-items:center;gap:0;box-shadow:0 32px 80px #0009,0 0 0 1px #ffffff0a inset;animation:cardIn .5s cubic-bezier(.22,1,.36,1) both}@keyframes cardIn{0%{opacity:0;transform:translateY(20px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.auth-icon{width:64px;height:64px;background:var(--accent-dim);border:1px solid rgba(91,138,240,.3);border-radius:18px;display:flex;align-items:center;justify-content:center;margin-bottom:28px;box-shadow:0 0 32px var(--accent-glow)}.auth-card h1{font-family:var(--mono);font-size:22px;font-weight:700;color:var(--text-hi);letter-spacing:-.5px;margin-bottom:10px}.auth-card p{color:var(--text-muted);font-size:13px;text-align:center;line-height:1.6;max-width:280px;margin-bottom:32px}.security-badges{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:32px}.badge{display:flex;align-items:center;gap:5px;background:var(--bg-hover);border:1px solid var(--border);border-radius:100px;padding:4px 10px;font-size:11px;color:var(--text-muted);font-family:var(--mono)}.badge .dot{width:6px;height:6px;border-radius:50%}.badge.green .dot{background:var(--green);box-shadow:0 0 6px var(--green)}.badge.blue .dot{background:var(--accent);box-shadow:0 0 6px var(--accent)}.btn-primary{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;background:var(--accent);color:#fff;border:none;padding:14px 24px;font-family:var(--sans);font-size:14px;font-weight:600;border-radius:var(--radius-md);cursor:pointer;transition:all .2s;letter-spacing:.01em}.btn-primary:hover{background:#7099f2;box-shadow:0 0 24px var(--accent-glow)}.btn-primary:active{transform:scale(.99)}.btn-primary.success{background:var(--green)}.btn-primary.success:hover{background:#5de0a5;box-shadow:0 0 24px #3ecf8e66}.btn-primary+.btn-primary{margin-top:10px}.btn-ghost{display:flex;align-items:center;justify-content:center;gap:6px;background:transparent;border:1px solid var(--border-hi);color:var(--text-main);padding:10px 16px;border-radius:var(--radius-sm);font-family:var(--sans);font-size:13px;font-weight:500;cursor:pointer;transition:all .15s}.btn-ghost:hover{background:var(--bg-hover);border-color:var(--border-hi);color:var(--text-hi)}.btn-icon{background:transparent;border:none;color:var(--text-muted);width:36px;height:36px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s;flex-shrink:0}.btn-icon:hover{background:var(--bg-hover);color:var(--text-hi)}.btn-icon svg{width:16px;height:16px}#app-layout{display:none;height:100%;width:100%}#sidebar{width:var(--sidebar-w);height:100%;background:var(--bg-panel);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;position:relative}.sidebar-header{height:var(--header-h);padding:0 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px}.my-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:700;color:#fff;flex-shrink:0;cursor:pointer;transition:box-shadow .2s}.my-avatar:hover{box-shadow:0 0 0 3px #ffffff1a}.sidebar-title{flex:1;font-family:var(--mono);font-size:13px;font-weight:700;color:var(--text-hi);letter-spacing:.05em}.btn-invite{margin:12px;padding:10px 14px;background:var(--accent-dim);border:1px solid rgba(91,138,240,.2);border-radius:var(--radius-md);color:var(--accent);font-family:var(--sans);font-size:13px;font-weight:500;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:8px}.btn-invite:hover{background:#5b8af033;border-color:#5b8af059}.search-wrap{padding:0 12px 10px;position:relative}.search-wrap svg{position:absolute;left:22px;top:50%;transform:translateY(-50%);width:14px;height:14px;color:var(--text-muted);pointer-events:none}.search-input{width:100%;background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 12px 8px 34px;color:var(--text-hi);font-family:var(--sans);font-size:13px;outline:none;transition:border-color .15s}.search-input:focus{border-color:var(--accent-muted)}.search-input::placeholder{color:var(--text-muted)}#contact-list{flex:1;overflow-y:auto}.empty-contacts{padding:40px 20px;text-align:center;color:var(--text-muted);font-size:13px;line-height:1.7}.contact-item{display:flex;align-items:center;gap:12px;padding:10px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .12s;position:relative}.contact-item:hover{background:var(--bg-hover)}.contact-item.active{background:var(--bg-active)}.contact-item.active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);border-radius:0 2px 2px 0}.contact-avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:700;color:#fff;flex-shrink:0;text-transform:uppercase}.contact-meta{flex:1;min-width:0}.contact-row1{display:flex;justify-content:space-between;align-items:center;margin-bottom:3px}.contact-name{font-weight:600;font-size:14px;color:var(--text-hi);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.contact-time{font-size:11px;color:var(--text-muted);font-family:var(--mono);flex-shrink:0;margin-left:8px}.contact-preview{font-size:12px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.contact-unread{background:var(--accent);color:#fff;font-size:10px;font-weight:700;min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 5px;flex-shrink:0}#chat-panel{flex:1;display:flex;flex-direction:column;background:var(--bg-base);min-width:0;position:relative}#empty-state{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg-base);z-index:5}.empty-icon{width:72px;height:72px;border-radius:24px;background:var(--bg-hover);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;margin-bottom:20px}.empty-icon svg{width:32px;height:32px;color:var(--text-dim)}#empty-state h2{font-size:16px;font-weight:600;color:var(--text-main);margin-bottom:6px}#empty-state p{font-size:13px;color:var(--text-muted);text-align:center;max-width:220px}.chat-header{height:var(--header-h);padding:0 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:var(--bg-panel);flex-shrink:0;gap:12px}.chat-header-left{display:flex;align-items:center;gap:12px;min-width:0}#btn-mobile-back{display:none}.header-avatar{width:36px;height:36px;border-radius:50%;font-family:var(--mono);font-size:12px;font-weight:700;color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.header-name{font-size:14px;font-weight:600;color:var(--text-hi);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-key{font-family:var(--mono);font-size:10px;color:var(--text-muted);margin-top:1px}.chat-header-right{display:flex;align-items:center;gap:4px}.dropdown-wrap{position:relative}.dropdown-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);background:var(--bg-panel);border:1px solid var(--border-hi);border-radius:var(--radius-md);box-shadow:0 12px 32px #00000080;z-index:200;overflow:hidden;min-width:180px}.dropdown-menu.open{display:block}.dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 14px;font-size:13px;color:var(--text-main);cursor:pointer;transition:background .1s}.dropdown-item:hover{background:var(--bg-hover);color:var(--text-hi)}.dropdown-item.danger{color:var(--red)}.dropdown-item.danger:hover{background:var(--red-dim)}.dropdown-item svg{width:14px;height:14px;flex-shrink:0}.dropdown-divider{height:1px;background:var(--border)}#chat-window{flex:1;overflow-y:auto;padding:20px 10%;display:flex;flex-direction:column;gap:2px}.date-label{align-self:center;background:var(--bg-panel);border:1px solid var(--border);border-radius:100px;padding:4px 14px;font-size:11px;font-family:var(--mono);color:var(--text-muted);margin:16px 0 8px;letter-spacing:.04em}.msg-wrap{display:flex;width:100%}.msg-wrap.me{justify-content:flex-end}.msg-wrap.them{justify-content:flex-start}.msg-wrap+.msg-wrap{margin-top:2px}.msg-wrap.group-start{margin-top:10px}.msg-bubble{max-width:65%;padding:9px 13px;border-radius:var(--radius-md);font-size:14px;line-height:1.55;word-break:break-word;-webkit-user-select:text;user-select:text;position:relative}.msg-bubble.me{background:var(--msg-me);border:1px solid var(--msg-me-border);border-bottom-right-radius:4px;color:#dce8ff}.msg-bubble.them{background:var(--msg-them);border:1px solid var(--msg-them-border);border-bottom-left-radius:4px;color:var(--text-hi)}.msg-bubble.me.first{border-radius:var(--radius-md);border-bottom-right-radius:4px}.msg-bubble.them.first{border-radius:var(--radius-md);border-bottom-left-radius:4px}.reply-quote{background:#00000040;border-left:2px solid var(--accent-muted);border-radius:4px;padding:6px 10px;margin-bottom:7px;font-size:12px;color:#c8d2f099;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.msg-text{white-space:pre-wrap}.msg-meta{display:flex;align-items:center;justify-content:flex-end;gap:4px;font-size:10px;margin-top:4px;float:right;margin-left:14px}.msg-bubble.me .msg-meta{color:#b4c8ff80}.msg-bubble.them .msg-meta{color:var(--text-muted)}.msg-meta svg{width:12px;height:12px;color:var(--accent-muted)}.input-zone{flex-shrink:0;background:var(--bg-panel);border-top:1px solid var(--border)}#reply-bar{display:none;align-items:center;gap:10px;padding:10px 16px;background:var(--bg-hover);border-bottom:1px solid var(--border)}.reply-bar-indicator{width:3px;height:100%;align-self:stretch;background:var(--accent);border-radius:2px;flex-shrink:0}.reply-bar-content{flex:1;min-width:0}.reply-bar-label{font-size:11px;color:var(--accent);font-weight:600;margin-bottom:2px}.reply-bar-text{font-size:12px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.input-row{display:flex;align-items:center;gap:10px;padding:12px 16px}#msg-input{flex:1;background:var(--bg-hover);border:1px solid var(--border);border-radius:24px;padding:11px 18px;color:var(--text-hi);font-family:var(--sans);font-size:14px;outline:none;transition:border-color .15s;resize:none}#msg-input:focus{border-color:var(--accent-muted)}#msg-input::placeholder{color:var(--text-muted)}#msg-input:disabled{opacity:.4;cursor:not-allowed}.btn-send{width:42px;height:42px;background:var(--accent);border:none;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;flex-shrink:0}.btn-send svg{width:16px;height:16px}.btn-send:hover:not(:disabled){background:#7099f2;box-shadow:0 0 20px var(--accent-glow)}.btn-send:disabled{background:var(--bg-hover);color:var(--text-dim);cursor:not-allowed}#ctx-menu{display:none;position:fixed;background:var(--bg-panel);border:1px solid var(--border-hi);border-radius:var(--radius-md);box-shadow:0 8px 24px #00000080;z-index:3000;overflow:hidden;min-width:160px}#ctx-menu.open{display:block}.ctx-item{display:flex;align-items:center;gap:9px;padding:10px 14px;font-size:13px;color:var(--text-main);cursor:pointer;transition:background .1s}.ctx-item:hover{background:var(--bg-hover);color:var(--text-hi)}.ctx-item svg{width:13px;height:13px}.modal-backdrop{display:none;position:fixed;inset:0;background:#000000bf;backdrop-filter:blur(6px);z-index:2000;align-items:center;justify-content:center}.modal-backdrop.open{display:flex}.modal-box{background:var(--bg-panel);border:1px solid var(--border-hi);border-radius:var(--radius-xl);width:min(460px,94vw);box-shadow:0 24px 60px #0009;overflow:hidden;animation:modalIn .2s cubic-bezier(.22,1,.36,1)}@keyframes modalIn{0%{opacity:0;transform:scale(.96) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--border)}.modal-title{font-size:15px;font-weight:600;color:var(--text-hi);display:flex;align-items:center;gap:8px}.modal-title svg{width:16px;height:16px;color:var(--accent)}.modal-body{padding:24px;display:flex;flex-direction:column;gap:18px}.field-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em;margin-bottom:6px;font-family:var(--mono)}.mono-box{background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;font-family:var(--mono);font-size:11px;color:var(--accent);word-break:break-all;display:flex;align-items:center;justify-content:space-between;gap:10px;cursor:pointer;transition:border-color .15s}.mono-box:hover{border-color:var(--border-hi)}.mono-box span{flex:1}.danger-box{background:var(--red-dim);border:1px solid rgba(240,91,91,.2);border-radius:var(--radius-md);padding:14px;display:flex;align-items:center;gap:12px;cursor:pointer;transition:background .15s;font-size:13px;font-weight:500;color:var(--red)}.danger-box:hover{background:#f05b5b33}.danger-box svg{flex-shrink:0;width:16px;height:16px}.warning-note{font-size:11px;color:var(--red);display:flex;gap:6px;align-items:flex-start}#qrcode-container{background:#fff;border-radius:var(--radius-md);padding:16px;display:inline-flex;align-items:center;justify-content:center;margin:0 auto}#qrcode-container img,#qrcode-container canvas{display:block}.share-key{font-family:var(--mono);font-size:11px;color:var(--accent);text-align:center;word-break:break-all;line-height:1.8;background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px}.share-buttons{display:flex;gap:10px}.share-buttons .btn-primary{margin-top:0}#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%) translateY(80px);background:var(--bg-panel);border:1px solid var(--border-hi);border-radius:var(--radius-md);padding:10px 18px;font-size:13px;color:var(--text-hi);display:flex;align-items:center;gap:8px;box-shadow:0 8px 24px #0006;transition:transform .3s cubic-bezier(.22,1,.36,1);z-index:9999;pointer-events:none}#toast.show{transform:translate(-50%) translateY(0)}#toast svg{width:14px;height:14px;color:var(--green)}.enc-badge{display:flex;align-items:center;gap:5px;background:var(--green-dim);border:1px solid rgba(62,207,142,.2);border-radius:100px;padding:3px 10px;font-size:10px;font-family:var(--mono);color:var(--green)}.enc-badge:before{content:"";width:5px;height:5px;background:var(--green);border-radius:50%;box-shadow:0 0 6px var(--green)}@media(max-width:768px){:root{--sidebar-w: 100%}#app-layout{position:relative;overflow:hidden}#sidebar{position:absolute;top:0;left:0;z-index:50;transition:transform .25s cubic-bezier(.22,1,.36,1)}#sidebar.hidden{transform:translate(-100%)}#btn-mobile-back{display:flex!important;align-items:center;justify-content:center}#chat-window{padding:16px}.msg-bubble{max-width:88%}}