body {
  font-family: 'Noto Sans JP', Arial, sans-serif;
  background: #f7f8fa;
  color: #232f3e;
  margin: 0;
  padding: 0;
}
.main-contents {
  max-width: 820px;
  margin: 40px auto 0 auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  padding: 40px 28px 48px 28px;
}
h2 {
  font-size: 1.35em;
  font-weight: 700;
  color: #005eb8;
  margin: 72px 0 27px 0;
  border-left: 5px solid #00a3e0;
  padding-left: 12px;
  background: none;
}
h3 {
  font-size: 1.13em;
  font-weight: 700;
  color: #232f3e;
  margin: 42px 0 15px 0;
  border-left: 3px solid #8fd19e;
  padding-left: 10px;
  background: none;
}
h4 {
  font-size: 1em;
  font-weight: 600;
  color: #005eb8;
  margin: 36px 0 9px 0;
  padding-left: 0px;
}
p {
  font-size: 1em;
  margin: 0 0 18px 0;
  line-height: 1.8;
}
ol, ul {
  margin: 0 0 3px 3px;
  font-size: 1em;
  line-height: 2.0;
}
li {
  margin-bottom: 6px;
}
.article-img, .main-contents img {
  display: block;
  max-width: 100%;
  margin: 18px auto 24px auto;
  border-radius: 10px;
  box-shadow: 0 1px 6px rgba(0,0,0,0.08);
}
@media (max-width: 900px) {
  .main-contents {
    max-width: 98vw;
    padding: 18px 4vw 32px 4vw;
  }
  h2 {
    font-size: 1.1em;
    padding-left: 8px;
  }
  h3 {
    font-size: 1em;
    padding-left: 6px;
  }
}
.header, .header-bg {
  width: 100vw;
  min-width: 100vw;
  left: 0;
  right: 0;
  margin: 0;
  padding: 0;
  position: relative;
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
}
.header-bg {
  background-image: url('images/header-bg.png');
  background-size: cover;
  background-position: right top;
  background-repeat: no-repeat;
}
.header-inner {
  width: 100%;
  max-width: none;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 40px;
  min-height: 120px;
  box-sizing: border-box;
  position: relative;
}
.header-top-row {
  display: contents;
}
.header-logo {
  position: absolute;
  left: 40px;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  height: 100%;
}
.logo {
  width: 220px;
  height: 50px;
  object-fit: contain;
  display: block;
  margin-right: 12px;
}
.header-center {
  flex: 1 1 0;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}
.header-title {
  font-size: 1.8em;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.01em;
  line-height: 1.1;
  display: block;
  margin: 0;
  padding-top: 8px;
  padding-bottom: 8px;
  font-family: 'Noto Sans JP', Arial, sans-serif;
  text-shadow: 0 2px 8px rgba(35,47,62,0.10);
}
.header-lang {
  position: absolute;
  right: 120px;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  min-width: 110px;
  text-align: right;
  font-size: 1.05em;
  color: #fff;
  padding-left: 16px;
}
.lang-active {
  font-weight: bold;
  color: #fff;
  margin-left: 6px;
  margin-right: 6px;
}
.lang-link {
  color: #fff;
  text-decoration: underline;
  margin-left: 6px;
  margin-right: 6px;
  font-weight: 400;
}
.lang-link:hover {
  color: #ff9900;
  text-decoration: none;
}
.hero {
  background: #fff;
  padding: 40px 16px 24px 16px;
  text-align: center;
  border-bottom: 1px solid #e5e7eb;
  max-width: 700px;
  margin: 0 auto 32px auto;
}
.hero h1 {
  font-size: 1.7em;
  margin-bottom: 8px;
  color: #232f3e;
  font-weight: 700;
}
.divider {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 16px auto 16px auto;
  width: 80%;
}
.lead {
  font-size: 1.1em;
  margin-bottom: 12px;
  color: #232f3e;
}
.overview-list {
  max-width: 500px;
  margin: 0 auto;
  text-align: left;
  padding-left: 20px;
  font-size: 0.98em;
  color: #232f3e;
}
.contents {
  padding: 32px 8px 40px 8px;
  max-width: 1200px;
  margin: 0 auto;
}
.contents h2 {
  text-align: center;
  color: #232f3e;
  margin-bottom: 28px;
  font-size: 1.2em;
  font-weight: 600;
}
.content-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}
.lp-card {
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 2px 8px rgba(35,47,62,0.10);
  width: 260px;
  min-height: 340px;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  position: relative;
  margin: 0;
}
.card-img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 12px;
}
.arch-img {
  width: 90%;
  margin: 10px 0;
  border-radius: 4px;
  background: #f0f4f8;
  padding: 2px;
}
.card-video {
  width: 100%;
  margin-top: 8px;
  border-radius: 4px;
  background: #000;
}
.card h3 {
  color: #005eb8;
  margin: 10px 0 6px 0;
  font-size: 1.05em;
  font-weight: 600;
}
.card p {
  font-size: 0.97em;
  margin: 0 0 6px 0;
  text-align: center;
}
.footer {
  background: #232f3e;
  color: #fff;
  text-align: center;
  padding: 24px 0 60px 0;
  margin-top: 32px;
  border-top: 1px solid #e5e7eb;
  font-size: 0.8em;
}
.footer-inner {
  max-width: 900px;
  margin: 0 auto;
}
.footer-icon {
  height: 28px;
  margin-bottom: 8px;
}
.footer-nav {
  margin-top: 8px;
  font-size: 0.95em;
}
.footer-nav a {
  color: #fff;
  text-decoration: underline;
  margin: 0 4px;
}
.footer-nav a:hover {
  text-decoration: none;
}
@media (max-width: 900px) {
  .header-inner {
    padding: 15px 20px;
    flex-direction: column;
    height: auto;
    gap: 12px;
    align-items: stretch;
    min-height: auto;
  }
  .header-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }
  .header-logo {
    position: static;
    height: auto;
    flex: none;
  }
  .logo {
    width: 140px;
    height: 32px;
    margin-bottom: 0;
  }
  .header-lang {
    position: static;
    text-align: right;
    margin: 0;
    font-size: 0.95em;
    padding-left: 0;
    min-width: auto;
    flex: none;
  }
  .header-center {
    position: static;
    text-align: center;
    width: 100%;
    margin: 0;
  }
  .header-title {
    font-size: 1.1em;
    margin-bottom: 0;
    padding: 5px 0;
    line-height: 1.3;
  }
  .content-cards {
    flex-direction: column;
    align-items: center;
  }
  .card {
    width: 95%;
    max-width: 400px;
  }
  .hero {
    padding: 32px 4px 18px 4px;
  }
}
.hero.hero-wide {
  display: block;
  max-width: 900px;
  margin: 48px auto 32px auto;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.04);
  padding: 40px 24px 32px 24px;
}
.hero-left {
  color: #232f3e;
  text-align: center;
}
.hero-main-title {
  font-size: 2.2em;
  font-weight: 700;
  margin: 0 0 24px 0;
  line-height: 1.2;
  letter-spacing: 0.01em;
}
.hero-lead {
  font-size: 1.15em;
  margin-bottom: 0;
  line-height: 1.7;
}
.hero-right {
  flex: 0 0 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-card-img {
  width: 420px;
  height: 280px;
  border-radius: 32px;
  object-fit: cover;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  background: #e0e7ef;
}
@media (max-width: 1100px) {
  .hero.hero-wide {
    flex-direction: column;
    padding: 24px 8px 24px 8px;
    gap: 24px;
    min-height: unset;
  }
  .hero-right {
    flex: 0 0 auto;
  }
  .hero-card-img {
    width: 90vw;
    max-width: 400px;
    height: auto;
    min-height: 180px;
  }
}
.lp-hero-diagram {
  width: 320px;
  height: 320px;
  border-radius: 50%;
  object-fit: contain;
  background: #fff;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  /* border: none; 明示的に不要 */
}
.lp-cards {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  justify-content: center;
}