:root{--bg: #0b141a;--panel: #111b21;--sidebar: #202c33;--separator: #1f2c34;--muted: #8696a0;--text: #e9edef;--accent: #00a884;--bubble-me: #005c4b;--bubble-other: #202c33;--input: #2a3942;--tile: url(../bg-chat-tile-dark.png);font-family:Segoe UI,system-ui,-apple-system,Helvetica Neue,Arial}*{box-sizing:border-box}html,body,#root{height:100%;margin:0;background:var(--bg);color:var(--text)}.app{display:flex;height:100vh;overflow:hidden}.sidebar{width:360px;min-width:300px;background:var(--sidebar);display:flex;flex-direction:column;border-right:1px solid var(--separator)}.sidebar-top{height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--panel);border-bottom:1px solid var(--separator)}.sidebar-top .brand{display:flex;align-items:center;gap:12px}.brand .avatar{width:36px;height:36px;border-radius:50%;background:#233138;display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--muted)}.sidebar-actions{display:flex;align-items:center;gap:16px}.icon-btn{background:none;border:none;cursor:pointer;padding:6px;border-radius:6px;color:var(--muted)}.icon-btn:hover{background:#17212b;color:var(--text)}.search{padding:8px 12px;border-bottom:1px solid var(--separator);background:var(--sidebar)}.search .searchbox{display:flex;align-items:center;gap:10px;background:var(--input);border-radius:8px;padding:8px 12px;color:var(--muted)}.search input{flex:1;background:transparent;border:none;outline:none;color:var(--text)}.conversation-list{flex:1;overflow:auto}.item{display:grid;grid-template-columns:56px 1fr auto;gap:12px;padding:10px 16px;align-items:center;cursor:pointer}.item:hover{background:#182229}.item.active{background:#2a3942}.item .avatar{width:48px;height:48px;border-radius:50%;background:#2e3a43;display:flex;align-items:center;justify-content:center;color:#b3c2c7;font-weight:700}.item .meta{min-width:0}.item .name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item .last{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item .time{font-size:12px;color:var(--muted)}.chat{flex:1;display:flex;flex-direction:column;background:var(--panel)}.chat-header{height:60px;display:flex;align-items:center;gap:12px;padding:0 16px;background:#202c33;border-bottom:1px solid var(--separator)}.chat-header .avatar{width:40px;height:40px;border-radius:50%;background:#2e3a43;display:flex;align-items:center;justify-content:center;color:#b3c2c7;font-weight:700}.chat-header .title{display:flex;flex-direction:column}.chat-header .name{font-weight:600}.chat-header .status{font-size:12px;color:var(--muted)}.chat-actions{margin-left:auto;display:flex;gap:8px}.chat-main{flex:1;position:relative;background:#0b141a}.chat-main:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:var(--bg) var(--tile) repeat;background-size:350px;opacity:.18;pointer-events:none}.messages{position:relative;z-index:1;height:100%;overflow:auto;padding:24px 40px;display:flex;flex-direction:column;gap:8px}.msg{max-width:65%;padding:8px 12px;border-radius:8px;box-shadow:0 1px #0003;font-size:14px;line-height:1.4;position:relative;animation:fadeIn .2s ease-in}.msg.sent{align-self:flex-end;background:var(--bubble-me);color:#fff}.msg.received{align-self:flex-start;background:var(--bubble-other);color:#e9edef}.timestamp{display:block;font-size:11px;color:var(--muted);margin-top:6px;text-align:right}.composer{display:flex;align-items:center;gap:10px;padding:10px 16px;background:#202c33;border-top:1px solid var(--separator)}.composer .field{flex:1;display:flex;align-items:center;gap:10px;background:#2a3942;border-radius:8px;padding:10px 12px}.composer input{flex:1;background:transparent;border:none;outline:none;color:var(--text)}.send-btn{width:44px;height:44px;border-radius:50%;background:var(--accent);border:none;color:#083c34;cursor:pointer;transition:transform .1s ease-in}.send-btn:hover{transform:scale(1.05)}.context-menu{position:fixed;background:#233138;border:1px solid #2a3942;border-radius:8px;list-style:none;padding:6px 0;z-index:99999;min-width:190px;box-shadow:0 8px 20px #0006;animation:fadeIn .15s ease-in-out;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.context-menu li{padding:10px 18px;color:#e9edef;cursor:pointer;font-size:14px;transition:background .15s}@keyframes fadeIn{0%{opacity:0;transform:scale(.98)}to{opacity:1;transform:scale(1)}}.hidden{display:none}@media (max-width: 1024px){.sidebar{display:none}}.context-menu{position:fixed;background:#1e2a32;border:1px solid #2a3942;border-radius:8px;list-style:none;padding:6px 0;z-index:999999;min-width:200px;box-shadow:0 8px 24px #00000080;animation:fadeIn .1s ease-in;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);-webkit-user-select:none;user-select:none}.context-menu li{padding:10px 18px;color:#e9edef;cursor:pointer;font-size:14px;transition:background .1s ease-in-out;white-space:nowrap}.context-menu li:hover{background:#2f3b42}@keyframes fadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}