.body{width:100%;background:linear-gradient(145deg,#1a2634,#232f3f);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px;font-family:Plus Jakarta Sans,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.chat-app{max-width:1400px;width:100%;height:90vh;background:#f0f4fa;border-radius:32px;box-shadow:0 30px 60px #00141e66;display:flex;overflow:hidden;backdrop-filter:blur(4px);position:relative}.history-sidebar{width:320px;background:#eef2f6;border-right:1px solid rgba(150,170,190,.25);display:flex;flex-direction:column;padding:24px 0 0;box-shadow:4px 0 12px #00000008;transition:transform .3s ease;z-index:100}.history-header{padding:0 18px 18px;border-bottom:1px solid #d9e0e9}.history-header-top{display:flex;align-items:center;justify-content:space-between}.history-header h3{font-size:1.1rem;font-weight:700;color:#1e2b3c;display:flex;align-items:center;gap:8px}.history-header h3 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#0000004d}.history-sidebar.active{transform:translate(0)}.close-sidebar,.menu-toggle{display:block}.sidebar-overlay{display:block;pointer-events:none}.sidebar-overlay.active{pointer-events:auto}.chat-main-header{padding:12px 16px}.contact-avatar{width:40px;height:40px;font-size:1.2rem}.contact-details h2{font-size:1rem}1 .realtime-indicator{font-size:.7rem}.message-bubble{max-width:85%}.messages-container{padding:16px}.chat-footer{padding:12px 16px 16px}}@media(max-width:640px)and (orientation:landscape){.chat-app{height:100vh;border-radius:0}.body{padding:0}.history-sidebar{width:280px}.contact-avatar{width:36px;height:36px;font-size:1rem}.message-input{padding:10px 0}.attach-btn,.send-btn{width:40px;height:40px}}@media(max-width:480px){.body{padding:0}.chat-app{height:100vh;border-radius:0}.history-sidebar{width:85%;max-width:320px}.chat-main-header{padding:10px 12px}.contact-avatar{width:36px;height:36px;font-size:1rem}.contact-details h2{font-size:.95rem}.realtime-indicator{font-size:.65rem}.message-bubble{max-width:90%;padding:10px 14px}.message-text{font-size:.9rem}.file-attachment{padding:10px 12px;gap:8px;min-width:160px}.file-icon{font-size:1.6rem}.file-name{font-size:.85rem}.messages-container{padding:12px}.chat-footer{padding:10px 12px 12px}.input-area{padding:4px 4px 4px 16px}.message-input{padding:12px 0;font-size:.9rem}.attach-btn,.send-btn{width:42px;height:42px;font-size:1rem}.file-hint span.hint-text{display:none}.file-hint span.hint-short{display:inline}.file-hint{justify-content:center;font-size:.65rem}}@media(max-width:360px){.contact-info{gap:8px}.contact-avatar{width:32px;height:32px}.contact-details h2{font-size:.85rem}.message-bubble{max-width:95%}.attach-btn,.send-btn{width:38px;height:38px}.input-area{padding:4px 4px 4px 12px}.file-hint i{font-size:.8rem}}