@charset "UTF-8";
body {
  font-size: 16px;
}
h1 {
  font-size: 28px;
  font-weight: bold;
}
h2 {
  font-size: 20px;
  margin: 10px 0;
}
h3 {
  font-size: 18px;
}
img {
  width: 100%;
  height: auto;
}
#content {
  padding-top: 20px;
  padding-bottom: 20px;
}
#content-wrap {
  margin: 0 auto;
  background-color: rgba(255, 255, 255, 0.8);
  box-shadow: 2px 2px 2px rgba(0, 0, 0, 0.5);
}
#sidebar {
  text-align: center;
}
footer {
  background-color: #222;
}
footer p {
  padding: 15px 0;
  color: white;
}
#catchphrase {
  margin-bottom: 0;
  padding-bottom: 0.5rem;
  font-size: 13px;
}

.btn_box {
    background: linear-gradient(to top, #7BB1EA 0%, #79B5FF 100%);
    border-radius: 8px;
    text-shadow: 0 -1px 3px #585858;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.topbutton {
    height: 40px;
    border-radius: 8px;
    border-right: 1px solid #5697E7;
    border-left: 1px solid #92C5FC;
    border-top: 1px solid #7EB3EC;
    border-bottom: 1px solid #5192E2;
    background: linear-gradient(to top, #7BB1EA 0%, #679FDB 50%, #84BAF2 51%, #79B5FF 100%);
    color: #fff;
    font-weight: bold;
    display: flex; /* Flexboxを使用 */
    align-items: center; /* 垂直方向に中央揃え */
    justify-content: center; /* 水平方向にも中央揃え */
    text-align: center;
    text-decoration: none;
    flex: 1;
    min-width: 110px;
    transition: all 0.3s ease;
}


.topbutton:hover {
       background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0, #3F3F3F), color-stop(0.5, #383838), color-stop(0.51, #434343), color-stop(1, #555555));
       background-image: -moz-linear-gradient(center bottom, #3F3F3F 0%, #383838 50%, #434343 51%, #555555 100% );
       background-color:#383838; /* Fallback */
   color: #FF85BB; /* テキスト色は維持 */
}

.topbutton:active {
   background: linear-gradient(to bottom, #ff69b4, #ff1493 15%, #ffb6c1);
   transform: scale(0.95);
}

.top_logo{
    width: auto;
    max-width: 200px;
}
.bg_pattern {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #ffe9a7;
  opacity: 0.4;
  z-index: -1;
}
.Rhombus {
  background-image:  linear-gradient(135deg, #ffc107 25%, transparent 25%), linear-gradient(225deg, #ffc107 25%, transparent 25%), linear-gradient(45deg, #ffc107 25%, transparent 25%), linear-gradient(315deg, #ffc107 25%, #ffe9a7 25%);
  background-position:  20px 0, 20px 0, 0 0, 0 0;
  background-size: 20px 20px;
  background-repeat: repeat;
}

.bg-white-50 {
  background-color: rgba(255, 255, 255, 0.5); /* 白 (50%の透明度) */
}