:root{--bg-main: #f0f2f5;--bg-sidebar: #ffffff;--bg-chat: #efeae2;--bg-chat-header: #f0f2f5;--border-lighter: #e9edef;--text-main: #111b21;--text-muted: #667781;--text-active: #00a884;--bubble-out: #d9fdd3;--bubble-in: #ffffff;--accent: #00a884;--hover-bg: #f5f6f6;--active-bg: #f0f2f5;--font-main: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background-color:#d1d7db;background-image:linear-gradient(180deg,#00a884 127px,#d1d7db 0);color:var(--text-main);height:100vh;display:flex;justify-content:center;align-items:center;overflow:hidden}.app-container{width:95vw;height:95vh;max-width:1600px;display:flex;background:#ffffff;box-shadow:0 6px 18px #0000000d;overflow:hidden}.sidebar{width:30%;min-width:350px;max-width:500px;border-right:1px solid var(--border-lighter);display:flex;flex-direction:column;background:var(--bg-sidebar)}.sidebar-header{height:60px;padding:10px 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#f5f6f6}.chat-item:hover{background:var(--hover-bg)}.chat-item.active{background:var(--active-bg)}.avatar{width:49px;height:49px;border-radius:50%;background:#dfe5e7;margin-right:15px;display:flex;align-items:center;justify-content:center;font-weight:600;color:#fff;flex-shrink:0}.chat-info{flex:1;min-width:0}.chat-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:2px}.chat-title{font-size:1rem;font-weight:400;color:var(--text-main);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-time{font-size:.75rem;color:var(--text-muted)}.chat-bottom{display:flex;align-items:center;font-size:.85rem;color:var(--text-muted)}.chat-preview{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.unread-badge{background:#25d366;color:#fff;min-width:20px;height:20px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;margin-left:auto;padding:0 6px;box-shadow:0 1px 1px #0000001a}.chat-view{flex:1;display:flex;flex-direction:column;background:var(--bg-chat);position:relative}.chat-view:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:url(/Background\ chat.png);background-repeat:repeat;background-size:400px;opacity:.25;z-index:0;pointer-events:none}.chat-header{height:60px;padding:10px 16px;background:#f0f2f5;display:flex;align-items:center;z-index:10;border-left:1px solid rgba(0,0,0,.05)}.chat-header .avatar{width:40px;height:40px;margin-right:15px}.chat-header-info{flex:1}.chat-header-info .name{font-size:1rem;font-weight:500}.messages-container{flex:1;padding:20px 7%;overflow-y:auto;display:flex;flex-direction:column;z-index:1;overflow-anchor:none}.date-header{display:flex;justify-content:center;margin:15px 0 20px;position:sticky;top:5px;z-index:20}.date-header span{background:#ffffff;color:#54656f;padding:6px 14px;border-radius:7.5px;font-size:12.5px;font-weight:500;box-shadow:0 1px .5px #00000021;text-transform:uppercase}.messages-container::-webkit-scrollbar{width:6px}.messages-container::-webkit-scrollbar-thumb{background:rgba(0,0,0,.08)}.message-group{display:flex;flex-direction:column;margin-bottom:12px}.message{max-width:65%;padding:6px 7px 8px 9px;border-radius:7.5px;position:relative;font-size:14.2px;line-height:19px;margin-bottom:2px;word-wrap:break-word;box-shadow:0 1px .5px 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