* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  background: #0b0d10;
  color: #e9edf2;
  line-height: 1.8;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.narrow {
  width: min(820px, 92%);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 13, 16, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.header-inner {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img {
  height: 42px;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  color: #c8d0da;
}

.nav a:hover {
  color: #fff;
}

.menu-toggle {
  display: none;
  background: none;
  border: 0;
  color: #fff;
  font-size: 28px;
}

.hero {
  padding: 110px 0 100px;
  background:
    radial-gradient(circle at top right, rgba(74, 144, 226, 0.25), transparent 35%),
    linear-gradient(135deg, #0b0d10 0%, #111827 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
}

.eyebrow {
  color: #7fb3ff;
  letter-spacing: 0.15em;
  font-size: 13px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.1;
  margin: 16px 0 24px;
}

h2 {
  font-size: 32px;
  margin-bottom: 18px;
}

h3 {
  margin: 0 0 10px;
}

.hero-text,
.lead {
  max-width: 760px;
  color: #c7cfda;
  font-size: 18px;
}

.hero-buttons {
  margin-top: 34px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 700;
}

.btn.primary {
  background: #ffffff;
  color: #0b0d10;
}

.btn.secondary {
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
}

.section {
  padding: 78px 0;
}

.dark-section {
  background: #11151b;
}

.feature-grid {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card,
.site-card,
.contact-box {
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: 24px;
}

.feature-card p,
.site-card p {
  color: #b8c0cc;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.section-head a {
  color: #7fb3ff;
}

.site-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.site-card {
  overflow: hidden;
  padding: 0;
}

.site-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #222;
}

.site-card div {
  padding: 22px;
}

.site-card span {
  color: #7fb3ff;
  font-size: 13px;
  font-weight: 700;
}

.site-card a {
  color: #fff;
  font-weight: 700;
}

.page-hero {
  padding: 76px 0;
  background: linear-gradient(135deg, #111827, #0b0d10);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.page-hero h1 {
  font-size: clamp(38px, 6vw, 58px);
}

.page-hero p {
  color: #c7cfda;
}

.info-list {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 14px 24px;
  margin-bottom: 42px;
}

.info-list dt {
  color: #8ea0b5;
}

.info-list dd {
  margin: 0;
}

.list {
  padding-left: 22px;
}

.form {
  display: grid;
  gap: 14px;
}

.form input,
.form textarea {
  width: 100%;
  padding: 13px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.16);
  background: #151a21;
  color: #fff;
}

.form label {
  font-weight: 700;
  margin-top: 8px;
}

.notice {
  padding: 14px 18px;
  border-radius: 12px;
  background: rgba(127, 179, 255, 0.15);
  border: 1px solid rgba(127, 179, 255, 0.35);
}

.small {
  color: #9aa6b6;
  font-size: 13px;
}

.site-footer {
  padding: 54px 0 0;
  background: #07090c;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}

.footer-grid p,
.footer-grid a {
  color: #aeb8c6;
  display: block;
  margin-bottom: 8px;
}

.copyright {
  margin-top: 40px;
  padding: 18px;
  text-align: center;
  color: #7f8a99;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 13px;
}

@media (max-width: 820px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    display: none;
    position: absolute;
    top: 76px;
    right: 4%;
    width: 220px;
    background: #11151b;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 18px;
    flex-direction: column;
  }

  .nav.active {
    display: flex;
  }

  .feature-grid,
  .site-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .info-list {
    grid-template-columns: 1fr;
  }
}