:root{
  --main:#1f6fc1;
  --main-light:#e7f1fb;
  --bg:#f8fafc;
  --card:#ffffff;
}
*{box-sizing:border-box;}
body{
  font-family:-apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  margin:0;
  background:var(--bg);
  color:#222;
  line-height:1.6;
}
header{
  color:#fff;
  text-shadow:0 1px 4px rgba(0,0,0,0.3);
  background:url('images/classroom.jpg') center/cover no-repeat;
  position:relative;
}
header::before{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(31,111,193,0.3);
}
.wrap{max-width:1080px;margin:0 auto;padding:28px 16px;position:relative;z-index:2;}
h1{margin:0;font-size:1.8rem;font-weight:700;}
nav{margin-top:12px;}
nav a{color:#fff;text-decoration:none;margin-right:18px;font-size:.95rem;}
nav a:hover{text-decoration:underline;}
.hero{display:flex;flex-wrap:wrap;gap:24px;align-items:center;margin-top:24px;}
.hero-text{flex:1 1 320px;}
.hero-text h2{margin:0;font-size:1.6rem;}
.cta{
  display:inline-block;
  margin-top:14px;
  padding:10px 16px;
  background:#fff;
  color:var(--main);
  border-radius:8px;
  text-decoration:none;
  font-weight:600;
}
.cta:hover{background:var(--main-light);}
section{padding:48px 0;}
h3{color:var(--main);border-left:6px solid var(--main);padding-left:10px;}
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}
.card{
  background:var(--card);
  padding:20px;
  border-radius:12px;
  box-shadow:0 4px 14px rgba(0,0,0,0.05);
}
.card strong,.card p{color:#000;}
.card p b{color:var(--main);font-size:1.15rem;}
input,textarea{
  width:100%;padding:10px;border:1px solid #ccc;border-radius:6px;font-size:1rem;
}
button{
  background:var(--main);
  color:#fff;
  border:none;
  padding:10px 18px;
  border-radius:8px;
  font-weight:600;
  cursor:pointer;
}
button:hover{background:#155896;}
iframe.map{width:100%;height:300px;border:0;border-radius:10px;margin-top:12px;}
footer{background:var(--main);color:#fff;text-align:center;padding:24px 16px;font-size:.9rem;}
.contact-banner {
  background: var(--main);
  color: #fff;
  text-align: center;
  padding: 48px 20px;
  border-radius: 12px;
  margin: 40px 0;
}

.contact-banner h3 {
  margin: 0 0 10px;
  font-size: 1.6rem;
}

.contact-banner p {
  margin: 0 0 20px;
  font-size: 1rem;
}

.contact-btn {
  display: inline-block;
  background: #fff;
  color: var(--main);
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
}

.contact-btn:hover {
  background: var(--main-light);
}
.center-card{
  display: flex;
  justify-content: center; /* 左右中央 */
  align-items: center;     /* 上下中央 */
  min-height: 120px;       /* 高さを揃える（重要） */
}

.center-card{
  display: flex;
  flex-direction: column;   /* 縦並び */
  justify-content: center;  /* 上下中央 */
  align-items: center;      /* 左右中央 */
  min-height: 160px;
  text-align: center;
}

.center-card .desc{
  margin-top: 10px;
  font-size: 0.9rem;
  color: #333;
}

/* ここから追加 */

.section-title{
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 1.2rem;
  color: var(--main);
}

.company-info{
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 10px 16px;
  margin-bottom: 32px;
}

.company-info dt{
  font-weight: 600;
  color: #555;
}

.company-info dd{
  margin: 0;
}

.message{
  line-height: 1.8;
  margin-bottom: 24px;
}
/* ここから追加 */
#page-top{
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 48px;
  height: 48px;
  background: var(--main);
  color: #fff;
  text-align: center;
  line-height: 48px;
  font-size: 18px;
  border-radius: 50%;
  text-decoration: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s, visibility .3s;
  z-index: 1000;
}

#page-top:hover{
  background: #155896;
}

/* 表示状態 */
#page-top.show{
  opacity: 1;
  visibility: visible;
}