@keyframes fadeIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.app .capa-principal,body{display:flex;flex-direction:column}body{height:100vh;width:100%;justify-content:center;align-items:center;font-family:"Segoe UI",Tahoma,Geneva,Verdana,sans-serif;font-size:1.6rem;background:#f5f7fa;color:#333}.hidden{display:none!important}*,::after,::before{box-sizing:border-box;margin:0;padding:0}html{font-size:62.5%}h1,h2{text-shadow:1px 1px 3px rgba(0,0,0,.4);text-align:center;font-size:clamp(2.5rem,3vw,4rem)}h2{font-size:clamp(1.8rem,2.5vw,3rem);margin-bottom:1.5rem;text-shadow:1px 1px 2px rgba(0,0,0,.2)}.app,body{overflow:hidden}.app{width:90%;height:100%;margin:3rem auto 0;background:#fff;padding:1.5rem;border-radius:1.2rem;box-shadow:0 1rem 3rem rgba(0,0,0,.1)}@media (min-width:768px){.app{height:80vh;max-width:70rem}}.app .capa-principal{height:100%;overflow-y:auto}.back-link{display:inline-block;position:absolute;width:2rem;height:2rem;top:1rem;left:1rem;color:#555;text-decoration:none;font-weight:700;transition:color .3s ease,transform .3s ease-in-out}@media (min-width:768px){.back-link{top:3rem;left:3rem;width:3rem;height:3rem}}.back-link:hover{text-decoration:underline;transform:scale(1.2)}.contacto{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;background:#fff;padding:1rem;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.05);cursor:pointer}.contacto .nombre,.formulario label{font-weight:700}.mensajes{display:flex;flex-direction:column;gap:1rem;margin:1.5rem 0;overflow-y:auto;flex-grow:1;padding-right:.8rem;height:85%}@media (min-width:768px){.mensajes{height:90%}}.mensaje{margin-bottom:1.5rem;background:#fff;border-left:4px solid #4f46e5;max-width:70%;padding:1rem 2rem;border-radius:1.8rem;font-size:1.4rem;line-height:1.4;word-break:break-word;position:relative;box-shadow:0 .4rem 1.2rem rgba(0,0,0,.07)}.mensaje.emisor{align-self:flex-end;background:#4f46e5;color:#fff;border-bottom-right-radius:0}.mensaje.receptor{align-self:flex-start;background:#d0d9f6;color:#333;border-bottom-left-radius:0}.panel,.panel-contactos{margin-top:1.5rem;padding:1.5rem;background:#eef2ff;border-radius:1rem}.panel{flex:1}.panel-contactos{box-shadow:0 .4rem 1.2rem rgba(0,0,0,.1);height:auto;max-height:20vh;overflow-y:auto}@media (min-width:768px){.panel-contactos{max-height:10vh}}.panel-chat{display:flex;flex-direction:column;height:80%;flex-grow:1;padding:0 2rem;background:#eef2ff;border-radius:1.5rem;border-bottom:2px solid rgba(79,70,229,.2);box-shadow:0 .4rem 1.2rem rgba(0,0,0,.1);margin-top:1.5rem;overflow-y:auto;align-items:center}.panel-chat .titulo-chat{text-align:center;margin-bottom:1rem;position:fixed;left:50%;transform:translateX(-50%);padding:1rem;border-radius:8px;background-color:rgba(255,255,255,.3);z-index:1}.panel-chat .mensajes{display:flex;flex-direction:column;gap:1rem;margin-top:3rem}.btn-agregar,button{background:#4f46e5;color:#fff}button{padding:1rem 2rem;border:0;font-weight:700;border-radius:8px;cursor:pointer;transition:background .3s ease}button:hover{background:#4338ca}#cerrarModalBtn{margin-top:1.6rem;background:#e11d48}#cerrarModalBtn:hover{background:#be123c}.btn-agregar{transition:background-color .3s ease,color .3s ease;width:100%;max-width:35rem;top:0;left:0;right:0;margin:2rem auto}.btn-agregar:focus,.btn-agregar:hover{background:0 0;color:#4f46e5;border:1px solid #4f46e5}.btn-detalles,.btn-eliminar{margin-left:5px;padding:3px 6px;cursor:pointer;font-size:1.3rem}.btn-detalles{background:0 0;color:#4f46e5;border:1px solid #3c35ca;transition:background-color .3s ease,color .3s ease}.btn-detalles:focus,.btn-detalles:hover{background-color:#3c35ca;color:#fff}.btn-eliminar{background:0 0;color:#dc143c;border:1px solid #dc143c;font-weight:700;transition:background-color .3s ease,color .3s ease}.btn-eliminar:focus,.btn-eliminar:hover{background-color:#dc143c;color:#fff}.formulario{display:flex;flex-direction:column;gap:1.5rem;padding:1.5rem}.formulario input,.formulario-mensaje input{padding:1rem;border:1px solid #ccc;border-radius:4px;font-size:1.5rem}.formulario-mensaje{display:flex;justify-content:flex-end;align-items:center;gap:1rem;margin-top:1.5rem}.formulario-mensaje input{flex:1}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,.4);backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;z-index:999}.modal-overlay.hidden{display:none}.modal-content{background:#fff;padding:1.5rem;border-radius:1.2rem;width:90%;box-shadow:0 2rem 4rem rgba(0,0,0,.2);animation:fadeIn .3s ease-out;position:relative}@media (min-width:768px){.modal-content{max-width:60rem;padding:3rem}}.modal-content h2{margin-top:0}.acciones-modal{margin-top:1rem;display:flex;gap:.5rem}