/* 左下 - 四角形 */
  html::before{
    content: '';
    position: fixed;
    bottom: -40px;
    left: -40px;
    width: 250px;
    height: 250px;
    background: #34A853;
    z-index: -1;
    pointer-events: none;
    transform: rotate(45deg);
  }
  
  /* 右下 - 五角形っぽい図形（菱形） */
  html::after{
    content: '';
    position: fixed;
    bottom: -30px;
    right: -30px;
    width: 200px;
    height: 200px;
    background: #4285F4;
    clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
    z-index: -1;
    pointer-events: none;
  }

body{
   overflow: hidden;
   margin: 0 auto;
   position: relative;
   font-family: "Noto Sans JP";
}

/* スマホ版でコンテンツを表示可能にする */
@media (max-width: 768px) {
  body {
    overflow: auto;
  }
}

/* 左上 - 円 */
body::before{
   content: '';
   position: fixed;
   top: -50px;
   left: -50px;
   width: 200px;
   height: 200px;
   background: radial-gradient(circle, #FBBC05, #FBBC05);
   border-radius: 50%;
   z-index: -1;
   pointer-events: none;
}

/* 右上 - 三角形 */
body::after{
   content: '';
   position: fixed;
   top: -30px;
   right: -100px;
   width: 0;
   height: 0;
   border-left: 150px solid transparent;
   border-right: 150px solid transparent;
   border-bottom: 160px solid #EA4335;
   z-index: -1;
   pointer-events: none;
   transform: rotate(60deg);
}

.about{
   margin: 0 auto;
   display: flex;
   width: 81%;
   gap: 20px;
}

@media (max-width: 768px) {
  .about {
    width: 100%;
    flex-direction: column;
    gap: 0;
  }
}

.about_box{
   margin: 0 auto;
   padding: 20px;
   height: 500px;
   width: 100%;
   display: flex;
   justify-content: center;
   align-items: center;
}

@media (max-width: 768px) {
  .about_box {
    width: 100%;
    height: auto;
    padding: 15px;
  }
}

.about_device_box{
   display: flex;
   justify-content: center;
   align-items: center;
}

.about_box_info{
   font-size: 120%;
}

@media (max-width: 768px) {
  .about_box_info {
    font-size: 100%;
  }
}

@media (max-width: 480px) {
  .about_box_info {
    font-size: 90%;
  }
}

.about_device_img_size{

   width: 100%;
   height: 50%;
}
.about_img_size{
   width: 50%;
   height: 25%;
}

.button_box{
   display: flex;
   margin: auto;
   padding: 5px;
   height: 75px;
   width: 80%;
   flex-direction: row;
   gap: 0;
}

@media (max-width: 768px) {
  .button_box {
    width: 95%;
    flex-direction: column;
    height: auto;
    gap: 10px;
    padding: 10px 0;
  }
}

.button_main{
   text-decoration: none;
   display: flex;
   justify-content: center;
   align-items: center;
   width: 50%;
   height: 100%;
   font-size: 80%;
   border-radius: 25px;
   color: white;
   background-color: #4285F4;
   transition: background-color 0.2s ease;
   padding: 0;
   box-sizing: border-box;
   margin: 0 5%;
}

@media (max-width: 768px) {
  .button_main {
    width: 100%;
    height: 50px;
    font-size: 16px;
    margin: 0;
  }
}

.button_main:hover{
   display: flex;
   justify-content: center;
   align-items: center;
   border-radius: 25px;
   color: white;
   background-color: #5269D1;
}



/* ------------------ Carousel styles ------------------ */
.carousel{
   width: 100%;
   margin: 40px auto;
}

@media (max-width: 768px) {
  .carousel {
    margin: 20px auto;
  }
}

.carousel__viewport{
   margin: auto;
   overflow: hidden;
   width: 80%;
   border-radius: 8px;
}

@media (max-width: 768px) {
  .carousel__viewport {
    width: 95%;
  }
}
.carousel__track{
   display: flex;
   will-change: transform;
}

/* keyframes used for seamless loop (JS sets duration) */
@keyframes scroll{
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.carousel__slide{
   flex: 0 0 auto; /* each slide keeps its own width */
   box-sizing: border-box;
}
.carousel__slide img{
   display: block;
   width: auto;
   height: 200px;
   object-fit: contain;
}

@media (max-width: 768px) {
  .carousel__slide img {
    height: 150px;
  }
}

@media (max-width: 480px) {
  .carousel__slide img {
    height: 120px;
  }
}