/* =====================================================
   Tat Seng Packaging — carton.wa-ya.cn
   Hoja de estilos principal (diseño responsivo)
   ===================================================== */
:root{
  --marron-oscuro:#241a10;
  --marron:#3b2a1a;
  --kraft:#a9743f;
  --kraft-oscuro:#8a5c30;
  --dorado:#d9a441;
  --dorado-claro:#f0d9a8;
  --crema:#faf6ef;
  --blanco:#ffffff;
  --texto:#3e362e;
  --gris:#7a6f63;
  --borde:#e8dfd2;
  --sombra:0 10px 30px rgba(36,26,16,.08);
  --sombra-hover:0 16px 40px rgba(36,26,16,.14);
  --radio:14px;
  --transicion:all .28s ease;
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Inter','Segoe UI',Tahoma,Arial,sans-serif;
  color:var(--texto);
  background:var(--blanco);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:'Montserrat','Segoe UI',Arial,sans-serif;color:var(--marron-oscuro);line-height:1.25;}
h1{font-size:2.5rem;font-weight:800;}
h2{font-size:2rem;font-weight:700;}
h3{font-size:1.3rem;font-weight:700;}
p{margin-bottom:1rem;}
a{color:var(--kraft);text-decoration:none;transition:var(--transicion);}
a:hover{color:var(--kraft-oscuro);}
img{max-width:100%;height:auto;display:block;}
ul{list-style:none;}

.contenedor{max-width:1180px;margin:0 auto;padding:0 22px;}
.seccion{padding:78px 0;}
.seccion-crema{background:var(--crema);}
.seccion-centro{text-align:center;}

/* ---------- Encabezados de sección ---------- */
.etiqueta-seccion{
  display:inline-block;
  font-size:.78rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--kraft);margin-bottom:12px;
}
.titulo-seccion{margin-bottom:14px;}
.subtitulo-seccion{color:var(--gris);max-width:720px;margin:0 auto 42px;}
.linea-dorada{width:64px;height:4px;background:linear-gradient(90deg,var(--dorado),var(--kraft));border-radius:2px;margin:18px auto;}

/* ---------- Botones ---------- */
.btn{
  display:inline-block;padding:14px 32px;border-radius:50px;
  font-weight:700;font-size:.95rem;letter-spacing:.02em;
  transition:var(--transicion);border:2px solid transparent;cursor:pointer;text-align:center;
}
.btn-primario{background:linear-gradient(135deg,var(--dorado),var(--kraft));color:#fff;box-shadow:0 8px 22px rgba(169,116,63,.35);}
.btn-primario:hover{color:#fff;transform:translateY(-2px);box-shadow:0 12px 28px rgba(169,116,63,.45);}
.btn-borde{border-color:var(--kraft);color:var(--kraft);background:transparent;}
.btn-borde:hover{background:var(--kraft);color:#fff;transform:translateY(-2px);}
.btn-blanco{border-color:#fff;color:#fff;background:transparent;}
.btn-blanco:hover{background:#fff;color:var(--marron);}
.btn-claro{background:#fff;color:var(--marron);}
.btn-claro:hover{color:var(--kraft);transform:translateY(-2px);}

/* ---------- Cabecera ---------- */
.cabecera{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--borde);
}
.barra-cabecera{
  display:flex;align-items:center;justify-content:space-between;
  height:78px;max-width:1180px;margin:0 auto;padding:0 22px;
}
.marca{display:flex;align-items:center;gap:14px;}
.marca img{width:52px;height:52px;border-radius:10px;box-shadow:var(--sombra);}
.marca-texto strong{
  display:block;font-family:'Montserrat',sans-serif;font-size:1.02rem;
  color:var(--marron-oscuro);font-weight:800;line-height:1.2;
}
.marca-texto span{font-size:.72rem;color:var(--gris);letter-spacing:.06em;}
.navegacion ul{display:flex;align-items:center;gap:30px;}
.navegacion a{font-weight:600;font-size:.94rem;color:var(--texto);position:relative;padding:6px 0;}
.navegacion a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;
  background:var(--dorado);transition:var(--transicion);
}
.navegacion a:hover::after,.navegacion a.activo::after{width:100%;}
.navegacion a.activo{color:var(--kraft);}
.btn-cabecera{padding:10px 24px;font-size:.88rem;}
.btn-menu{
  display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px;
}
.btn-menu span{display:block;width:26px;height:3px;background:var(--marron-oscuro);border-radius:2px;transition:var(--transicion);}

/* ---------- Héroe ---------- */
.heroe{
  position:relative;color:#fff;
  background:
    linear-gradient(115deg,rgba(36,26,16,.88) 0%,rgba(59,42,26,.78) 55%,rgba(169,116,63,.55) 100%),
    url('/img/banner.jpg') center/cover no-repeat;
  padding:120px 0 130px;
}
.heroe-contenido{max-width:760px;}
.heroe .etiqueta-seccion{color:var(--dorado);}
.heroe h1{color:#fff;font-size:2.9rem;margin-bottom:20px;}
.heroe h1 em{font-style:normal;color:var(--dorado);}
.heroe p{font-size:1.12rem;color:rgba(255,255,255,.88);margin-bottom:34px;max-width:640px;}
.heroe-acciones{display:flex;gap:16px;flex-wrap:wrap;}

/* ---------- Franja de cifras ---------- */
.cifras{background:var(--marron-oscuro);padding:44px 0;}
.cifras-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;text-align:center;}
.cifra strong{
  display:block;font-family:'Montserrat',sans-serif;font-size:2.2rem;
  font-weight:800;color:var(--dorado);
}
.cifra span{font-size:.88rem;color:rgba(255,255,255,.75);}

/* ---------- Tarjetas genéricas ---------- */
.rejilla{display:grid;gap:28px;}
.rejilla-2{grid-template-columns:repeat(2,1fr);}
.rejilla-3{grid-template-columns:repeat(3,1fr);}
.rejilla-4{grid-template-columns:repeat(4,1fr);}
.tarjeta{
  background:#fff;border:1px solid var(--borde);border-radius:var(--radio);
  overflow:hidden;box-shadow:var(--sombra);transition:var(--transicion);
  display:flex;flex-direction:column;
}
.tarjeta:hover{transform:translateY(-6px);box-shadow:var(--sombra-hover);}
.tarjeta-img{overflow:hidden;background:#f3ece1;}
.tarjeta-img img{width:100%;height:210px;object-fit:cover;transition:transform .5s ease;}
.tarjeta:hover .tarjeta-img img{transform:scale(1.06);}
.tarjeta-cuerpo{padding:22px 22px 24px;flex:1;display:flex;flex-direction:column;}
.tarjeta-cuerpo h3{font-size:1.08rem;margin-bottom:10px;}
.tarjeta-cuerpo h3 a{color:var(--marron-oscuro);}
.tarjeta-cuerpo h3 a:hover{color:var(--kraft);}
.tarjeta-cuerpo p{font-size:.92rem;color:var(--gris);flex:1;}
.enlace-flecha{font-weight:700;font-size:.9rem;margin-top:12px;display:inline-flex;align-items:center;gap:6px;}

.tarjeta-icono{padding:30px 26px;text-align:left;}
.tarjeta-icono .icono{
  width:56px;height:56px;border-radius:14px;margin-bottom:18px;
  background:linear-gradient(135deg,var(--dorado-claro),var(--kraft));
  display:flex;align-items:center;justify-content:center;
}
.tarjeta-icono .icono svg{width:28px;height:28px;stroke:#fff;}
.tarjeta-icono h3{font-size:1.05rem;margin-bottom:10px;}
.tarjeta-icono p{font-size:.9rem;color:var(--gris);margin:0;}

/* ---------- Dos columnas con imagen ---------- */
.dos-columnas{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.dos-columnas img{border-radius:var(--radio);box-shadow:var(--sombra);}
.lista-verificacion li{
  position:relative;padding-left:32px;margin-bottom:12px;font-size:.97rem;
}
.lista-verificacion li::before{
  content:"";position:absolute;left:0;top:5px;width:20px;height:20px;border-radius:50%;
  background:linear-gradient(135deg,var(--dorado),var(--kraft));
}
.lista-verificacion li::after{
  content:"";position:absolute;left:6px;top:10px;width:8px;height:4px;
  border-left:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(-45deg);
}

/* ---------- Banda CTA ---------- */
.cta-banda{
  background:
    linear-gradient(115deg,rgba(36,26,16,.9),rgba(101,74,44,.82)),
    url('/img/banner.jpg') center/cover no-repeat;
  color:#fff;text-align:center;padding:70px 0;
}
.cta-banda h2{color:#fff;margin-bottom:14px;}
.cta-banda p{color:rgba(255,255,255,.85);max-width:640px;margin:0 auto 30px;}

/* ---------- Página interior / migas de pan ---------- */
.cabecera-pagina{
  background:
    linear-gradient(115deg,rgba(36,26,16,.88),rgba(59,42,26,.8)),
    url('/img/banner.jpg') center/cover no-repeat;
  color:#fff;padding:64px 0 58px;
}
.cabecera-pagina h1{color:#fff;font-size:2.2rem;margin-bottom:10px;}
.cabecera-pagina p{color:rgba(255,255,255,.82);max-width:720px;margin:0;}
.migas{font-size:.85rem;color:rgba(255,255,255,.7);margin-bottom:14px;}
.migas a{color:var(--dorado);}
.migas span{margin:0 8px;opacity:.6;}

/* ---------- Página de productos ---------- */
.categoria-productos{margin-bottom:56px;}
.categoria-productos h2{font-size:1.5rem;margin-bottom:8px;display:flex;align-items:center;gap:12px;}
.categoria-productos h2::before{
  content:"";width:10px;height:26px;border-radius:4px;
  background:linear-gradient(180deg,var(--dorado),var(--kraft));
}
.categoria-productos > p{color:var(--gris);margin-bottom:26px;max-width:820px;}

/* ---------- Detalle de producto ---------- */
.detalle-producto{display:grid;grid-template-columns:460px 1fr;gap:52px;align-items:start;}
.detalle-imagen{
  position:sticky;top:100px;background:#f6f1e7;border:1px solid var(--borde);
  border-radius:var(--radio);padding:26px;box-shadow:var(--sombra);
}
.detalle-imagen img{border-radius:10px;width:100%;}
.detalle-contenido h1{font-size:1.9rem;margin-bottom:16px;}
.detalle-contenido .resumen-destacado{
  background:var(--crema);border-left:4px solid var(--dorado);
  padding:16px 20px;border-radius:0 10px 10px 0;margin-bottom:24px;
  font-size:1.02rem;color:var(--marron);
}
.detalle-contenido h2{font-size:1.25rem;margin:28px 0 12px;}
.tabla-especificaciones{width:100%;border-collapse:collapse;margin:8px 0 18px;font-size:.93rem;}
.tabla-especificaciones th,.tabla-especificaciones td{
  border:1px solid var(--borde);padding:10px 14px;text-align:left;
}
.tabla-especificaciones th{background:var(--crema);color:var(--marron-oscuro);width:220px;font-weight:700;}
.pilares{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0 20px;}
.pilar{
  display:flex;gap:12px;align-items:flex-start;background:var(--crema);
  border-radius:10px;padding:14px 16px;
}
.pilar .icono{flex-shrink:0;width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--dorado),var(--kraft));
  display:flex;align-items:center;justify-content:center;}
.pilar .icono svg{width:20px;height:20px;stroke:#fff;}
.pilar strong{display:block;font-size:.92rem;color:var(--marron-oscuro);}
.pilar span{font-size:.84rem;color:var(--gris);}

/* ---------- Productos relacionados ---------- */
.relacionados{border-top:1px solid var(--borde);}

/* ---------- Historia / cronología ---------- */
.cronologia{position:relative;max-width:860px;margin:0 auto;padding-left:34px;}
.cronologia::before{
  content:"";position:absolute;left:8px;top:6px;bottom:6px;width:3px;
  background:linear-gradient(180deg,var(--dorado),var(--kraft));border-radius:2px;
}
.hito{position:relative;padding-bottom:30px;}
.hito::before{
  content:"";position:absolute;left:-33px;top:8px;width:15px;height:15px;border-radius:50%;
  background:#fff;border:4px solid var(--kraft);box-shadow:0 0 0 4px rgba(169,116,63,.15);
}
.hito .anio{
  font-family:'Montserrat',sans-serif;font-weight:800;color:var(--kraft);
  font-size:1.15rem;display:block;margin-bottom:4px;
}
.hito p{color:var(--texto);margin:0;font-size:.95rem;}

/* ---------- Certificados ---------- */
.rejilla-cert{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.certificado{
  background:#fff;border:1px solid var(--borde);border-radius:12px;
  padding:18px 16px;text-align:center;font-size:.88rem;font-weight:600;
  color:var(--marron);box-shadow:var(--sombra);transition:var(--transicion);
  display:flex;align-items:center;justify-content:center;gap:10px;min-height:76px;
}
.certificado:hover{transform:translateY(-4px);border-color:var(--dorado);}
.certificado svg{width:22px;height:22px;stroke:var(--kraft);flex-shrink:0;}

/* ---------- Cultura ---------- */
.cultura-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;}
.tarjeta-cultura{
  background:linear-gradient(135deg,#fff 0%,var(--crema) 100%);
  border:1px solid var(--borde);border-radius:var(--radio);padding:30px 28px;
  box-shadow:var(--sombra);
}
.tarjeta-cultura h3{color:var(--kraft);margin-bottom:10px;font-size:1.05rem;text-transform:uppercase;letter-spacing:.08em;}
.tarjeta-cultura p{margin:0;color:var(--texto);font-size:.97rem;}

/* ---------- FAQ ---------- */
.faq-lista{max-width:860px;margin:0 auto;}
.faq-item{
  background:#fff;border:1px solid var(--borde);border-radius:12px;
  margin-bottom:14px;overflow:hidden;box-shadow:var(--sombra);
}
.faq-item summary{
  cursor:pointer;padding:20px 56px 20px 24px;font-weight:700;
  font-family:'Montserrat',sans-serif;color:var(--marron-oscuro);
  list-style:none;position:relative;font-size:1rem;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);
  font-size:1.6rem;color:var(--kraft);font-weight:400;transition:var(--transicion);
}
.faq-item[open] summary::after{content:"−";}
.faq-item[open] summary{color:var(--kraft);}
.faq-item .respuesta{padding:0 24px 22px;color:var(--texto);font-size:.95rem;}
.faq-item .respuesta p{margin-bottom:.6rem;}

/* ---------- Formulario de contacto ---------- */
.formulario-envoltura{max-width:760px;margin:0 auto;}
.formulario{
  background:#fff;border:1px solid var(--borde);border-radius:var(--radio);
  padding:38px;box-shadow:var(--sombra);
}
.fila-formulario{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.campo{margin-bottom:18px;}
.campo label{display:block;font-weight:600;font-size:.9rem;margin-bottom:7px;color:var(--marron-oscuro);}
.campo label span{color:#c0392b;}
.campo input,.campo textarea{
  width:100%;padding:13px 16px;border:1.5px solid var(--borde);border-radius:10px;
  font-size:.95rem;font-family:inherit;color:var(--texto);background:var(--crema);
  transition:var(--transicion);
}
.campo input:focus,.campo textarea:focus{
  outline:none;border-color:var(--kraft);background:#fff;box-shadow:0 0 0 4px rgba(169,116,63,.12);
}
.campo textarea{min-height:150px;resize:vertical;}
.campo-oculto{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden;}
.nota-privacidad{font-size:.82rem;color:var(--gris);margin-top:14px;}
.mensaje-exito{
  display:none;background:linear-gradient(135deg,#eaf7ee,#f2faf4);
  border:1.5px solid #bfe3c8;border-radius:var(--radio);
  padding:36px;text-align:center;margin-bottom:22px;
}
.mensaje-exito.visible{display:block;animation:aparecer .5s ease;}
.mensaje-exito .icono-exito{
  width:64px;height:64px;border-radius:50%;margin:0 auto 18px;
  background:linear-gradient(135deg,#5cb85c,#3d9b52);
  display:flex;align-items:center;justify-content:center;
}
.mensaje-exito .icono-exito svg{width:32px;height:32px;stroke:#fff;}
.mensaje-exito h3{color:#2e7d3f;margin-bottom:8px;}
.mensaje-exito p{color:#4c7a58;margin:0;font-size:.95rem;}
.mensaje-error{
  display:none;background:#fdf0ef;border:1.5px solid #f2c4c0;border-radius:10px;
  padding:14px 18px;color:#a94442;font-size:.9rem;margin-bottom:18px;
}
.mensaje-error.visible{display:block;}
@keyframes aparecer{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:translateY(0);}}

/* ---------- Pie de página ---------- */
.pie{
  background:var(--marron-oscuro);color:rgba(255,255,255,.75);
  padding:64px 0 0;font-size:.92rem;
}
.pie-rejilla{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px;}
.pie h4{color:#fff;font-size:1rem;margin-bottom:18px;letter-spacing:.04em;}
.pie a{color:rgba(255,255,255,.72);}
.pie a:hover{color:var(--dorado);}
.pie .marca img{width:46px;height:46px;}
.pie .marca-texto strong{color:#fff;}
.pie .marca-texto span{color:rgba(255,255,255,.55);}
.pie ul li{margin-bottom:10px;}
.pie-direccion{display:flex;gap:10px;margin-bottom:14px;align-items:flex-start;}
.pie-direccion svg{width:18px;height:18px;stroke:var(--dorado);flex-shrink:0;margin-top:4px;}
.pie-aviso{
  border-top:1px solid rgba(255,255,255,.12);
  padding:20px 0;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  font-size:.82rem;color:rgba(255,255,255,.5);
}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .rejilla-4{grid-template-columns:repeat(2,1fr);}
  .rejilla-3{grid-template-columns:repeat(2,1fr);}
  .pie-rejilla{grid-template-columns:repeat(2,1fr);}
  .detalle-producto{grid-template-columns:1fr;gap:34px;}
  .detalle-imagen{position:static;}
  .detalle-imagen img{max-width:560px;margin:0 auto;}
}
@media (max-width:860px){
  h1{font-size:2rem;}
  .heroe h1{font-size:2.2rem;}
  .heroe{padding:84px 0 92px;}
  .dos-columnas,.rejilla-2,.rejilla-3,.cultura-grid{grid-template-columns:1fr;}
  .cifras-grid{grid-template-columns:repeat(2,1fr);}
  .rejilla-cert{grid-template-columns:repeat(2,1fr);}
  .pilares{grid-template-columns:1fr;}
  .fila-formulario{grid-template-columns:1fr;}
  /* Menú móvil */
  .btn-menu{display:flex;}
  .navegacion{
    position:fixed;top:78px;left:0;right:0;background:#fff;
    box-shadow:0 20px 40px rgba(36,26,16,.15);
    max-height:0;overflow:hidden;transition:max-height .4s ease;
  }
  .navegacion.abierta{max-height:480px;}
  .navegacion ul{flex-direction:column;align-items:stretch;gap:0;padding:12px 22px 22px;}
  .navegacion li{border-bottom:1px solid var(--borde);}
  .navegacion li:last-child{border-bottom:none;}
  .navegacion a{display:block;padding:14px 4px;}
  .btn-cabecera{margin-top:14px;}
}
@media (max-width:560px){
  .rejilla-4,.rejilla-cert{grid-template-columns:1fr;}
  .cifras-grid{grid-template-columns:repeat(2,1fr);gap:18px;}
  .seccion{padding:56px 0;}
  .formulario{padding:26px 20px;}
  .marca-texto strong{font-size:.9rem;}
  .heroe-acciones .btn{width:100%;}
}