:root{--whatsapp-green: #006d5b;--whatsapp-green-light: #00a884;--whatsapp-green-dark: #1a5f4c;--whatsapp-bg: #e5ddd5;--whatsapp-chat-bg: #f0f2f5;--whatsapp-message-sent: #dcf8c6;--whatsapp-message-received: #ffffff;--whatsapp-gray: #8696a0;--whatsapp-gray-light: #f0f2f5}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--whatsapp-bg);min-height:100vh;-webkit-font-smoothing:antialiased}#root{min-height:100vh}.mobile-container{max-width:480px;margin:0 auto;min-height:100vh;background-color:#fff;position:relative;overflow:hidden}.header{background:linear-gradient(180deg,var(--whatsapp-green) 0%,var(--whatsapp-green-dark) 100%);padding:16px;color:#fff;display:flex;align-items:center;justify-content:space-between;box-shadow:0 2px 8px #00000026}.header-title{font-size:20px;font-weight:600}.header-actions{display:flex;gap:16px}.btn{border:none;background:none;cursor:pointer;font-size:16px;padding:8px 16px;border-radius:4px;transition:all .2s}.btn-primary{background-color:var(--whatsapp-green);color:#fff}.btn-primary:hover{background-color:var(--whatsapp-green-dark)}.btn-outline{border:1px solid var(--whatsapp-green);color:var(--whatsapp-green)}.btn-outline:hover{background-color:#006d5b1a}.chat-list{background-color:var(--whatsapp-chat-bg);height:calc(100vh - 60px);overflow-y:auto}.chat-item{display:flex;align-items:center;padding:12px 16px;background-color:#fff;border-bottom:1px solid rgba(0,0,0,.05);cursor:pointer;transition:background-color .2s}.chat-item:hover{background-color:#00000008}.chat-item:active{background-color:#0000000d}.avatar{width:50px;height:50px;border-radius:50%;background:linear-gradient(135deg,var(--whatsapp-green) 0%,var(--whatsapp-green-light) 100%);display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;font-weight:600;flex-shrink:0;margin-right:12px}.chat-info{flex:1;min-width:0}.chat-name{font-size:16px;font-weight:500;color:#111;margin-bottom:4px}.chat-preview{font-size:14px;color:var(--whatsapp-gray);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-meta{display:flex;flex-direction:column;align-items:flex-end;margin-left:12px}.chat-time{font-size:12px;color:var(--whatsapp-gray);margin-bottom:4px}.chat-unread{background-color:var(--whatsapp-green);color:#fff;font-size:12px;font-weight:600;padding:2px 8px;border-radius:10px;min-width:20px;text-align:center}.chat-screen{display:flex;flex-direction:column;height:100vh;background-color:var(--whatsapp-bg)}.chat-header{background:linear-gradient(180deg,var(--whatsapp-green) 0%,var(--whatsapp-green-dark) 100%);padding:12px 16px;color:#fff;display:flex;align-items:center;box-shadow:0 2px 8px #00000026}.back-btn{color:#fff;font-size:20px;margin-right:12px;cursor:pointer}.chat-header-info{flex:1}.chat-header-name{font-size:18px;font-weight:600}.chat-header-status{font-size:13px;opacity:.8}.messages-container{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px}.message{max-width:75%;padding:8px 12px;border-radius:8px;animation:messageFadeIn .2s ease-out}@keyframes messageFadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-sent{align-self:flex-end;background-color:var(--whatsapp-message-sent);border-bottom-right-radius:2px}.message-received{align-self:flex-start;background-color:var(--whatsapp-message-received);border-bottom-left-radius:2px;box-shadow:0 1px 2px #0000000d}.message-content{font-size:15px;line-height:1.4;color:#111;word-break:break-word}.message-meta{display:flex;justify-content:flex-end;margin-top:4px}.message-time{font-size:11px;color:var(--whatsapp-gray);margin-right:4px}.message-status{font-size:12px;color:#34b7f1}.message-input-area{background-color:#f0f2f5;padding:8px 16px;display:flex;align-items:center;gap:12px;box-shadow:0 -2px 8px #0000000d}.input-wrapper{flex:1;background-color:#fff;border-radius:20px;padding:8px 16px;display:flex;align-items:center}.message-input{flex:1;border:none;outline:none;font-size:15px;background:transparent}.send-btn{width:40px;height:40px;border-radius:50%;background-color:var(--whatsapp-green);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:18px;transition:transform .2s}.send-btn:hover{transform:scale(1.05)}.send-btn:active{transform:scale(.95)}.login-container{min-height:100vh;background:linear-gradient(135deg,var(--whatsapp-green) 0%,var(--whatsapp-green-dark) 100%);display:flex;align-items:center;justify-content:center;padding:20px}.login-card{background:#fff;border-radius:12px;padding:32px;width:100%;max-width:360px;box-shadow:0 10px 40px #0003}.login-logo{text-align:center;margin-bottom:24px}.login-logo-icon{font-size:64px;color:var(--whatsapp-green);margin-bottom:8px}.login-title{font-size:28px;font-weight:700;color:var(--whatsapp-green)}.form-group{margin-bottom:16px}.form-label{display:block;font-size:14px;font-weight:500;color:#333;margin-bottom:8px}.form-input{width:100%;padding:12px;border:1px solid #ddd;border-radius:8px;font-size:16px;outline:none;transition:border-color .2s}.form-input:focus{border-color:var(--whatsapp-green)}.login-btn{width:100%;padding:14px;background:linear-gradient(135deg,var(--whatsapp-green) 0%,var(--whatsapp-green-light) 100%);color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s}.login-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #006d5b4d}.login-btn:active{transform:translateY(0)}.login-links{text-align:center;margin-top:16px}.login-links a{color:var(--whatsapp-green);text-decoration:none;font-size:14px}.tab-bar{background-color:#fff;border-top:1px solid rgba(0,0,0,.05);padding:8px 0;display:flex;justify-content:space-around;position:fixed;bottom:0;left:0;right:0;max-width:480px;margin:0 auto;z-index:100}.tab-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 24px;cursor:pointer;color:var(--whatsapp-gray);transition:color .2s}.tab-item.active{color:var(--whatsapp-green)}.tab-icon{font-size:22px}.tab-label{font-size:11px}.profile-container{padding:20px;background-color:var(--whatsapp-chat-bg);min-height:calc(100vh - 60px)}.profile-header{background:linear-gradient(180deg,var(--whatsapp-green) 0%,var(--whatsapp-green-dark) 100%);padding:32px 20px;border-radius:12px;margin-bottom:16px;color:#fff}.profile-avatar{width:100px;height:100px;border-radius:50%;background:#fff3;display:flex;align-items:center;justify-content:center;font-size:40px;margin-bottom:12px}.profile-name{font-size:24px;font-weight:600;margin-bottom:4px}.profile-status{font-size:14px;opacity:.8}.profile-section{background-color:#fff;border-radius:8px;margin-bottom:16px;overflow:hidden}.profile-item{display:flex;align-items:center;padding:16px;border-bottom:1px solid rgba(0,0,0,.05);cursor:pointer;transition:background-color .2s}.profile-item:last-child{border-bottom:none}.profile-item:hover{background-color:#00000008}.profile-item-icon{font-size:20px;color:var(--whatsapp-gray);margin-right:16px}.profile-item-label{flex:1;font-size:16px;color:#111}.profile-item-arrow{font-size:14px;color:var(--whatsapp-gray)}.contacts-list{background-color:var(--whatsapp-chat-bg);min-height:calc(100vh - 60px);padding-bottom:60px}.contacts-header{padding:16px;background-color:#fff}.contacts-search{background-color:var(--whatsapp-gray-light);border-radius:8px;padding:8px 12px;display:flex;align-items:center}.contacts-search input{flex:1;border:none;background:transparent;outline:none;font-size:14px;margin-left:8px}.contacts-letter{padding:8px 16px;background-color:var(--whatsapp-gray-light);font-size:12px;font-weight:600;color:var(--whatsapp-gray)}.contact-item{display:flex;align-items:center;padding:12px 16px;background-color:#fff;border-bottom:1px solid rgba(0,0,0,.03);cursor:pointer}.contact-item:hover{background-color:#00000008}.contact-avatar{width:45px;height:45px;border-radius:50%;background:linear-gradient(135deg,var(--whatsapp-green) 0%,var(--whatsapp-green-light) 100%);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:600;margin-right:12px}.contact-info{flex:1}.contact-name{font-size:16px;font-weight:500;color:#111}.contact-status{font-size:13px;color:var(--whatsapp-gray)}.online-dot{width:10px;height:10px;border-radius:50%;background-color:#52c41a}.loading-spinner{display:flex;justify-content:center;align-items:center;padding:20px}.spinner{width:40px;height:40px;border:4px solid rgba(0,109,91,.2);border-top-color:var(--whatsapp-green);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}