body{
  font-family: "Kaisei Tokumin", serif;
  min-height: 100vh;
  position: relative;
}

main {
    position: relative;
    color: #754834;
    background: linear-gradient(
    to bottom,        
    #FFC2BD 0%,     
    #FFBF70 40%,
    #FFC2BD 80%,
    #FFC2BD 100%
  );
  z-index: 0;
  overflow: hidden;
}

header nav {
  display: flex; 
  align-items: center;
  height: 60px;
  justify-content: flex-end;
  gap: 5vw;
  padding-right: 7vw;
  background-color: #E55C43;
}

header a {
  text-decoration: none;
  color: #ffff;
  font-size: 18px;
}

nav a:hover {
  transition: 0.3s ease;
  transform: scale(1.10);
}

.bg-ball {
  position: absolute;
  width: 80vw;
  height: 80vw;
  background-repeat: no-repeat;
  background-size: contain;
  z-index: 1; 
}

.bg-ball1 {
  top: -20vw;
  left: -5vw;
  background-image: url('../img/back_pad.webp');
  transform: rotate(50deg);
}

.bg-ball2 {
  top: -13vw;
  left: 100%; 
  transform: translateX(-50vw) rotate(-80deg); 
  background-image: url('../img/back_pad.webp');
}

.bg-ball3 {
  top: 55vw;
  left: 100%; 
  background-image: url('../img/back_pad.webp');
  transform: translateX(-70vw) rotate(200deg);
}

header,
.breadcrumb,
.content-wrapper,
img,
h3,
.button_wrap,
footer {
  position: relative;
  z-index: 2;
}

.breadcrumb {
  display: flex;
  gap: 2vw; 
  padding-top: 4vw;
  padding-bottom: 0; 
  margin-left: 6vw;
  font-family: "BIZ UDGothic", sans-serif;
  font-size: 16px; 
  color: #754834;
}

.content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center; 
    text-align: center;   
    padding-left: 2vw;
}

img {
  display: block;       
  margin: 0 auto;        
  width: 550px;            
  height: auto; 
}

.big_nyan {
    display: inline-block;
    transform: rotate(-10deg);
    color:#E55C43 ;
    font-size: 60px;
}

h3 {
    font-size: 35px;
    text-align: center;  
    margin-bottom: 1vw;
}

.white_text {
    color: #fff;
}

p {
  font-size: 20px;
  text-align: center;
  margin: 0 auto;    
  margin-bottom: 5vw;
}

.button_wrap {
  display: flex;               
  justify-content: center;      
  gap: 40px;                    
  margin: 30px 0;   
  padding-left: 3.5vw;            
}

.btn { 
  font-family: "BIZ UDGothic", sans-serif;
  background-color: #E55C43; 
  color: #fff;             
  font-size: 15px;            
  border: none;             
  border-radius: 50px;    
  cursor: pointer;           
  transition: 0.3s ease;
  margin-bottom: 5vw;
  text-decoration: none;  
  display: inline-flex;      
  justify-content: center;    
  align-items: center;         
  width: 280px;               
  height: 70px;
}

.btn:hover {
  background-color: #ff7f50;
  transform: scale(1.05);
}

footer {
  display: flex; 
  height: 40px;
  background-color: #E55C43;
  justify-content: center;
  align-items: center;
}

footer p {
  font-size: 10px;
  color: #ffff;
  margin: 0;
}


@media (max-width: 768px) {

  header nav {
  height: 40px;
}

header a {
  font-size: 13px;
}

.bg-ball {
  width: 80vw;
  height: 80vw;
}

.breadcrumb {
  font-size: 12px; 
}

  
  img {       
  width: 50vw;            
  height: auto; 
}

  .big_nyan  {
    font-size: 45px;
}

h3 {
    font-size: 28px;
}

p {
  font-size: 16px;
}

.btn {
  font-size: 15px;  
  width: 210px;               
  height: 60px;
}

footer {
  height: 30px;
}

footer p {
  font-size: 7px;
}
}


@media (max-width: 480px) {

  header nav {
  height: 30px;
}

header a {
  font-size: 10px;
}

.breadcrumb {
  font-size: 9px; 
}

img {       
  width: 50vw;            
  height: auto; 
}

  .big_nyan  {
    font-size: 30px;
}

h3 {
    font-size: 25px;
}

p {
  font-size: 12px;
}

.button_wrap {
  gap: 10px; 
  padding-left: 1.5vw;            
}                               

.btn {
  font-size: 10px;  
  width: 150px;             
  height: 30px;
}

footer {
  height: 18px;
}

footer p {
  font-size: 5px;
}

}