* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  color: #102033;
  background:
    linear-gradient(rgba(255,255,255,.76), rgba(255,255,255,.76)),
    linear-gradient(90deg, rgba(20,80,120,.07) 1px, transparent 1px),
    linear-gradient(rgba(20,80,120,.07) 1px, transparent 1px);
  background-size: auto, 32px 32px, 32px 32px;
}
a { color: inherit; text-decoration: none; }

.nav {
  position: fixed;
  top: 14px; left: 18px; right: 18px;
  z-index: 10;
  display: flex;
  align-items: stretch;
  height: 58px;
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 999px;
  overflow: hidden;
  color: #fff;
  background: rgba(4,38,78,.76);
  backdrop-filter: blur(14px);
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 230px;
  padding: 0 26px;
  color: #073b70;
  background: #fff;
}
.logo .mark { font-size: 28px; }
.logo strong { display: block; font-size: 18px; }
.logo span { display: block; font-size: 9px; letter-spacing: .12em; color: #54708a; }
.nav nav { display: flex; flex: 1; }
.nav nav a {
  display: flex;
  align-items: center;
  padding: 0 28px;
  border-left: 1px solid rgba(255,255,255,.42);
  font-weight: 800;
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 720px;
  padding: 180px 8vw 90px;
  color: #fff;
  background:
    radial-gradient(circle at 55% 30%, rgba(130,220,255,.42), transparent 10%),
    radial-gradient(circle at 45% 55%, rgba(60,178,230,.28), transparent 18%),
    linear-gradient(145deg, #031227 0%, #064c8f 48%, #001b44 100%);
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(105deg, rgba(255,255,255,.055) 0 2px, transparent 2px 18px);
  opacity: .42;
}
.heroText, .heroCard, .buttons { position: relative; z-index: 1; }
.hero h1 { margin: 0 0 10px; font-size: clamp(42px, 7vw, 86px); line-height: 1; letter-spacing: -.06em; }
.hero h2 { margin: 0 0 28px; font-size: clamp(32px, 5vw, 68px); line-height: 1.05; letter-spacing: -.06em; }
.hero p { max-width: 760px; font-size: clamp(18px, 2.2vw, 26px); line-height: 1.85; font-weight: 800; }
.buttons { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.buttons a {
  padding: 18px 26px;
  border: 1px solid rgba(255,255,255,.86);
  border-radius: 9px;
  background: rgba(0,46,92,.62);
  font-weight: 900;
}
.heroCard {
  position: absolute;
  right: 58px;
  bottom: 56px;
  width: 340px;
  padding: 24px;
  border-radius: 20px;
  background: rgba(255,255,255,.9);
  color: #07365f;
  box-shadow: 0 16px 40px rgba(0,0,0,.22);
}
.heroCard span { font-weight: 900; color: #0b5592; }
.heroCard strong { display: block; margin: 8px 0; font-size: 28px; }
.heroCard p { margin: 0; font-size: 15px; color: #33526f; font-weight: 700; }

.section { width: min(1180px, calc(100% - 48px)); margin: 72px auto; }
.kicker { color: #0c70a8; font-weight: 900; letter-spacing: .14em; }
.section h2 { margin: 0 0 18px; font-size: clamp(34px, 5vw, 62px); line-height: 1.05; letter-spacing: -.055em; }
.lead { max-width: 880px; color: #43546a; font-size: 17px; line-height: 1.9; }

.daivBlock {
  display: grid;
  grid-template-columns: .84fr 1.16fr;
  gap: 28px;
  align-items: center;
  margin-top: 28px;
}
.darkCard {
  padding: 34px;
  border-radius: 24px;
  background: #08213d;
  color: #fff;
  box-shadow: 0 18px 42px rgba(6,32,58,.18);
}
.num {
  display: inline-flex;
  width: 54px; height: 54px;
  align-items: center; justify-content: center;
  border-radius: 50%;
  background: #fff;
  color: #073b6f;
  font-weight: 900;
}
.darkCard h3 { margin: 22px 0 10px; font-size: 42px; }
.darkCard h4 { margin: 0 0 20px; color: #bfe6ff; font-size: 18px; }
.darkCard p { color: #eef7ff; line-height: 1.9; font-size: 15px; }

.gifFrame {
  padding: 16px;
  border-radius: 26px;
  background: rgba(255,255,255,.9);
  border: 1px solid #dbe5ee;
  box-shadow: 0 20px 48px rgba(12,40,70,.14);
}
.gifFrame img { display: block; width: 100%; height: auto; border-radius: 18px; }

.cards, .projectGrid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 24px;
}
.cards article, .projectGrid article {
  padding: 28px;
  border: 1px solid #dce6ee;
  border-radius: 24px;
  background: rgba(255,255,255,.92);
  box-shadow: 0 16px 38px rgba(12,40,70,.08);
}
.cards span { color: #0c70a8; font-weight: 900; }
.cards h3, .projectGrid h3 { margin: 14px 0; font-size: 28px; letter-spacing: -.04em; }
.cards p, .projectGrid p, .note { color: #405168; line-height: 1.86; }

.blue {
  width: 100%;
  max-width: none;
  padding: 72px max(24px, calc((100vw - 1180px) / 2));
  color: #fff;
  background: linear-gradient(135deg, rgba(1,25,55,.95), rgba(0,88,122,.9));
}
.blue .kicker, .blue h2 { color: #fff; }
.blue .projectGrid { grid-template-columns: repeat(2, 1fr); }
.blue .projectGrid article {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.28);
  color: #fff;
}
.blue .projectGrid p { color: #eef8ff; }

.note {
  margin-top: 18px;
  padding: 18px;
  border-left: 5px solid #0c70a8;
  background: rgba(255,255,255,.8);
}
.company {
  display: grid;
  grid-template-columns: 180px 1fr;
  border: 1px solid #dbe5ee;
  border-radius: 18px;
  overflow: hidden;
  background: #dbe5ee;
}
.company dt, .company dd {
  margin: 0;
  padding: 18px 20px;
  background: #fff;
}
.company dt { color: #607286; font-weight: 800; }
.company dd { font-weight: 700; }

footer { padding: 42px 24px 60px; text-align: center; color: #5b6b7e; }

@media (max-width: 900px) {
  .nav { position: static; height: auto; border-radius: 0; flex-wrap: wrap; }
  .logo { width: 100%; }
  .nav nav { flex-wrap: wrap; }
  .nav nav a { height: 46px; padding: 0 16px; }
  .hero { padding: 80px 24px 60px; min-height: 680px; }
  .heroCard { position: relative; right: auto; bottom: auto; width: auto; margin-top: 34px; }
  .daivBlock, .cards, .projectGrid, .blue .projectGrid { grid-template-columns: 1fr; }
  .company { grid-template-columns: 1fr; }
}