:root {
  --bg: #f4f7f8;
  --panel: #ffffff;
  --ink: #172026;
  --muted: #5c6e79;
  --line: #d6e0e5;
  --navy: #123047;
  --blue: #1e6b8f;
  --cyan: #28a0a8;
  --soft: #eaf2f4;
  --warn: #8a5b00;
  --shadow: 0 18px 44px rgba(18, 48, 71, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 4%, rgba(40, 160, 168, 0.12), transparent 28rem),
    radial-gradient(circle at 92% 10%, rgba(30, 107, 143, 0.10), transparent 30rem),
    linear-gradient(180deg, #f9fbfc 0%, var(--bg) 100%);
  font-family: "Yu Gothic", "BIZ UDPGothic", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.8;
}

a { color: inherit; }
.shell { width: min(980px, calc(100% - 36px)); margin: 0 auto; }

header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(249, 251, 252, 0.9);
  border-bottom: 1px solid rgba(214, 224, 229, 0.75);
}

.header-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, var(--navy), var(--blue));
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.06em;
  box-shadow: 0 10px 24px rgba(18, 48, 71, 0.2);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-parent {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--navy);
}

.brand-product {
  font-size: 1rem;
  font-weight: 700;
}

nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

nav a {
  text-decoration: none;
  color: var(--navy);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
}

nav a:hover {
  background: rgba(18, 48, 71, 0.06);
  border-color: rgba(18, 48, 71, 0.12);
}

.nav-cta {
  color: #fff;
  background: linear-gradient(145deg, var(--navy), var(--blue));
  box-shadow: 0 10px 24px rgba(18, 48, 71, 0.18);
}

main { padding: 56px 0 72px; }

.hero-card,
.content-card {
  background: var(--panel);
  border: 1px solid rgba(214, 224, 229, 0.85);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 32px;
  margin-bottom: 28px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

h1 {
  margin: 12px 0 14px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

h2 {
  margin: 0 0 10px;
  font-size: clamp(1.35rem, 2.2vw, 1.8rem);
  line-height: 1.25;
}

h3 {
  margin: 0 0 10px;
  font-size: 1.02rem;
}

p.lead {
  margin: 0;
  color: var(--muted);
  max-width: 58rem;
}

.meta {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
  background: var(--soft);
  border: 1px solid rgba(18, 48, 71, 0.08);
}

.content-card {
  padding: 30px;
}

.section + .section {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

ul, ol {
  margin: 12px 0 0;
  padding-left: 1.2rem;
}

li + li { margin-top: 8px; }

.callout {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  background: #f7fbfc;
  border: 1px solid rgba(30, 107, 143, 0.14);
}

.warn {
  background: #fff8eb;
  border-color: rgba(138, 91, 0, 0.18);
}

.footer-links {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(18, 48, 71, 0.12);
  background: #fff;
  text-decoration: none;
  font-weight: 700;
  color: var(--navy);
}

footer {
  padding: 28px 0 44px;
  color: var(--muted);
}

footer .shell {
  display: grid;
  gap: 10px;
}

@media (max-width: 720px) {
  .header-inner {
    min-height: auto;
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .hero-card,
  .content-card {
    border-radius: 22px;
    padding: 22px;
  }
}