*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:20px}a{color:inherit;text-decoration:none}.container{max-width:1200px;margin:0 auto;background:#fff;border-radius:12px;box-shadow:0 10px 40px rgba(0,0,0,.1);padding:30px;min-height:calc(100vh - 40px)}.btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.btn:hover{transform:translateY(-2px);box-shadow:0 5px 15px rgba(102,126,234,.4)}.btn:active{transform:translateY(0)}.btn-secondary{background:#6c757d}.btn-danger{background:#dc3545}.input{width:100%;padding:12px;border:2px solid #e0e0e0;border-radius:8px;font-size:16px;transition:border-color .3s}.input:focus{outline:none;border-color:#667eea}.card{background:#f8f9fa;border-radius:8px;padding:20px;margin-bottom:20px;border:1px solid #e0e0e0}.message-item{background:#fff;padding:15px;border-radius:8px;margin-bottom:10px;border-left:4px solid #667eea}.message-item.outgoing{border-left-color:#28a745;background:#f0f9ff}.message-form{display:flex;gap:10px;margin-top:20px}.message-form input{flex:1 1}