* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "メイリオ", sans-serif;
  background: linear-gradient(135deg, #f6f9fc, #e9f2ff);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #333;
}

.construction-wrapper {
  text-align: center;
  padding: 20px;
}

.construction-box {
  background: #fff;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  max-width: 500px;
  width: 100%;
}

h1 {
  font-size: 28px;
  margin-bottom: 20px;
  color: #2c3e50;
}

.sub {
  font-size: 16px;
  margin-bottom: 15px;
  color: #555;
}

p {
  margin-bottom: 12px;
  line-height: 1.6;
}

.contact {
  margin-top: 20px;
  font-size: 14px;
  color: #777;
}

.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 25px;
  background: #4a90e2;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  transition: 0.3s;
}

.btn:hover {
  background: #357abd;
}

@media (max-width: 600px) {
  .construction-box {
    padding: 25px;
  }

  h1 {
    font-size: 22px;
  }
}

.old-site {
  margin-top: 30px;
  font-size: 14px;
  color: #666;
}

.old-link {
  display: inline-block;
  margin-top: 8px;
  color: #4a90e2;
  text-decoration: underline;
  transition: 0.3s;
}

.old-link:hover {
  opacity: 0.7;
}

.tel-link {
  color: #333;
  text-decoration: underline;
  font-weight: 500;
}

.tel-link:hover {
  opacity: 0.7;
}