body {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  background: #ffffff;
  color: #222;
}

/* 全体 */
.about {
  max-width: 900px;
  margin: auto;
  padding: 80px 20px;
}

/* タイトル */
.about-header {
  text-align: center;
  margin-bottom: 60px;
}

.about-header h1 {
  font-size: 28px;
  margin-bottom: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.about-header p {
  font-size: 14px;
  color: #777;
}

/* 本文 */
.about-content {
  max-width: 700px;
  margin: 0 auto 60px;
  line-height: 1.9;
  color: #444;
  text-align: center;
}

/* 強み */
.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* 可愛いカード */
.feature {
  background: linear-gradient(145deg, #f8fbff, #eef4ff);
  padding: 26px;
  border-radius: 18px;

  position: relative;

  box-shadow: 
    0 10px 30px rgba(47,109,246,0.08),
    inset 0 0 0 1px rgba(47,109,246,0.08);

  transition: 0.25s;
}

.feature::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;

  width: 100%;
  height: 4px;

  background: linear-gradient(90deg, #2f6df6, #7aa6ff);
  border-radius: 18px 18px 0 0;
}

.feature:hover {
  transform: translateY(-6px);
  box-shadow: 
    0 20px 40px rgba(47,109,246,0.12),
    inset 0 0 0 1px rgba(47,109,246,0.12);
}

.num {
  font-size: 11px;
  color: #7aa6ff;
  margin-bottom: 8px;
}

.feature h3 {
  font-size: 17px;
  margin-bottom: 6px;
  color: #2f6df6;
}

.feature p {
  font-size: 13px;
  color: #666;
  line-height: 1.6;
}

/* フッター */
.about-footer {
  margin-top: 80px;
  text-align: center;
  font-size: 15px;
  line-height: 1.8;
}

/* SP */
@media (max-width: 768px) {
  .about-features {
    grid-template-columns: 1fr;
  }

  .about {
    padding: 60px 20px;
  }
}

.header {
  position: sticky;
  top: 0;
  z-index: 999;

  background: #fff;
  border-bottom: 1px solid #eee;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
}

.logo {
  font-size: 20px;
  font-weight: bold;
}

nav {
  display: flex;
  gap: 16px;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: #333;
  font-size: 14px;
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: 10px;
  }

  nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}