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#f0f0f0;max-height:300px;overflow-y:auto}.section-label{font-size:12px;font-weight:600;text-transform:uppercase;color:#7f8c8d;margin:16px 0 12px;letter-spacing:.5px}.user-item{display:flex;align-items:center;padding:10px;margin:4px 0;border-radius:8px;cursor:pointer;transition:all .2s ease}.user-item:hover{background:#f8f9fa;transform:translate(2px)}.user-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;margin-right:12px;font-size:18px;color:#fff}.user-info{flex:1}.user-name{font-weight:500;color:#2c3e50;font-size:14px}.chats-section{flex:1;padding:0 20px;overflow-y:auto}.chat-item{display:flex;align-items:center;padding:12px;margin:4px 0;border-radius:10px;cursor:pointer;transition:all .2s ease;border:1px solid transparent}.chat-item:hover{background:linear-gradient(135deg,#f5f7fa,#e4e8f0);border-color:#e0e0e0;transform:translate(2px)}.chat-item:active{transform:translate(1px)}.chat-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#f093fb,#f5576c);display:flex;align-items:center;justify-content:center;margin-right:12px;font-size:20px;color:#fff}.chat-info{flex:1;min-width:0}.chat-name{font-weight:600;color:#2c3e50;font-size:14px;margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-last-message{font-size:12px;color:#7f8c8d;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chats-section::-webkit-scrollbar,.users-section::-webkit-scrollbar{width:4px}.chats-section::-webkit-scrollbar-track,.users-section::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}.chats-section::-webkit-scrollbar-thumb,.users-section::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:4px}.chats-section::-webkit-scrollbar-thumb:hover,.users-section::-webkit-scrollbar-thumb:hover{background:#a8a8a8}@media(max-width:768px){.sidebar{width:100%;height:100%;border-right:none;box-shadow:none}.sidebar-header{padding-top:60px}.chats-section{max-height:calc(100vh - 250px)}}.message-list{flex:1;padding:20px;overflow-y:auto;background:linear-gradient(180deg,#f8f9fa,#fff);display:flex;flex-direction:column;gap:8px}.message-container{display:flex;margin-bottom:8px;animation:fadeIn .3s ease}.message-left{justify-content:flex-start}.message-right{justify-content:flex-end}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-bubble{max-width:65%;padding:12px 16px;border-radius:18px;position:relative;word-wrap:break-word;line-height:1.4;box-shadow:0 2px 4px #0000001a;transition:all .2s ease}.message-bubble-me{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-bottom-right-radius:4px}.message-bubble-other{background:#fff;color:#2c3e50;border-bottom-left-radius:4px;border:1px solid #e0e0e0}.message-bubble-me:hover{box-shadow:0 4px 8px #667eea33}.message-bubble-other:hover{box-shadow:0 4px 8px #0000001a}.message-text{font-size:14px;white-space:pre-wrap}.message-image{border-radius:12px;overflow:hidden;margin:-4px}.message-image img{max-width:250px;max-height:250px;border-radius:12px;display:block;transition:transform .3s ease}.message-image img:hover{transform:scale(1.02)}.message-meta{display:flex;align-items:center;justify-content:flex-end;margin-top:4px;font-size:11px;gap:4px}.message-time{opacity:.9}.message-status{font-size:12px;display:inline-flex;align-items:center}.message-status.sent{color:#fffc}.message-status.delivered{color:#ffffffe6}.message-status.read{color:#76ff03}.timestamp-group{text-align:center;margin:16px 0;position:relative}.timestamp-label{display:inline-block;padding:4px 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spin{to{transform:rotate(360deg)}}.message-input{padding:16px 20px;background:#fff;border-top:1px solid #e0e0e0;box-shadow:0 -2px 10px #0000000d}.input-container{display:flex;align-items:center;gap:12px;background:#f8f9fa;border-radius:12px;padding:8px 12px;border:1px solid #e0e0e0;transition:all .2s ease}.input-container:focus-within{border-color:#4a90e2;background:#fff;box-shadow:0 0 0 3px #4a90e21a}.text-input{flex:1;border:none;outline:none;padding:10px 12px;font-size:14px;background:transparent;color:#2c3e50}.text-input::placeholder{color:#95a5a6}.input-actions{display:flex;align-items:center;gap:8px}.file-upload{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:#fff;cursor:pointer;font-size:20px;color:#7f8c8d;transition:all .2s ease;border:1px solid #e0e0e0}.file-upload:hover{background:#f0f0f0;color:#4a90e2;transform:translateY(-1px)}.file-upload input[type=file]{display:none}.send-button{padding:10px 24px;border:none;border-radius:8px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-weight:600;font-size:14px;cursor:pointer;transition:all .2s ease;min-width:80px;height:40px}.send-button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 12px #667eea4d}.send-button:active:not(:disabled){transform:translateY(0)}.send-button:disabled{opacity:.5;cursor:not-allowed;background:linear-gradient(135deg,#95a5a6,#7f8c8d)}@media(max-width:768px){.message-input{padding:12px;width:100%}.input-container{padding:6px 10px;width:170px}.text-input{padding:8px 10px;font-size:16px;width:160px}.send-button{padding:8px 16px;min-width:70px}}.chat-header{height:70px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;padding:0 24px;box-shadow:0 2px 10px 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ease}@media(max-width:768px){.chat-page-container{flex-direction:column}.sidebar-container{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:1000;background:#fff;transform:translate(-100%)}.sidebar-container.show{transform:translate(0)}.sidebar-container.hide{transform:translate(-100%)}.chat-area{width:100vw}.chat-area.active{display:flex}.mobile-menu-toggle{position:fixed;top:10px;left:70%;width:80px;z-index:1001;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:12px;border-radius:20px;font-size:14px;font-weight:600;cursor:pointer;box-shadow:0 2px 10px #0003}.chat-header-wrapper{position:relative}.no-chat-selected{display:flex;align-items:center;justify-content:center;height:100%;text-align:center;padding:20px}.no-chat-content{max-width:300px}.no-chat-icon{font-size:64px;margin-bottom:20px}.browse-chats-button{margin-top:20px;padding:12px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;width:100%}}@media(min-width:769px)and (max-width:1024px){.sidebar{width:280px;min-width:280px}.message-bubble{max-width:75%!important}}@media(min-width:1025px){.sidebar-container{display:block!important}.chat-area{display:flex!important}.mobile-menu-toggle,.browse-chats-button{display:none!important}}