:root {
  --bg: #f1f6ff;
  --surface: #ffffff;
  --line: #d8e4f5;
  --primary: #1f4fd6;
  --accent: #3a72ff;
  --ink: #1a2230;
  --muted: #5d6c86;
  --shadow-sm: 0 8px 24px rgba(16, 56, 115, 0.08);
  --shadow-md: 0 16px 40px rgba(16, 56, 115, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 400px at 100% -10%, rgba(42,125,225,0.12), transparent 60%),
    radial-gradient(800px 380px at -10% 15%, rgba(15,61,133,0.08), transparent 55%),
    var(--bg);
  line-height: 1.72;
}
a { text-decoration: none; color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: #1f4fd6;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 6px 16px rgba(10, 37, 84, 0.18);
}
.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 0.03em;
}
.logo-mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
}
.logo-text {
  font-size: 21px;
  line-height: 1;
}
.pc-nav { margin-left: auto; display: flex; gap: 6px; }
.pc-nav a {
  font-weight: 600;
  font-size: 14px;
  color: #eaf2ff;
  padding: 8px 12px;
  border-radius: 999px;
  transition: background .2s, color .2s;
}
.pc-nav a:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}
.tel {
  background: #ffffff;
  color: #1f4fd6;
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 800;
  box-shadow: 0 8px 18px rgba(8, 30, 66, 0.22);
}
.menu-btn { display: none; }
.sp-nav {
  display: none;
  background: linear-gradient(180deg, #173fb3, #12328f);
  border-top: 1px solid rgba(255,255,255,0.12);
}
.sp-nav.is-open { display: grid; }

.site-footer {
  margin-top: 52px;
  background: linear-gradient(180deg, #0f2f6f, #0a214b);
  color: #dce6ff;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 34px 20px 28px;
  display: grid;
  grid-template-columns: 1.1fr 1.3fr 1fr;
  gap: 30px;
  align-items: start;
}

.footer-col {
  min-width: 0;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-logo-mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.footer-logo {
  color: #ffffff;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.footer-en {
  margin: 8px 0 0;
  color: #afc2ef;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.footer-col-info p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.6;
  color: #d2defb;
}

.footer-col-info .footer-tel {
  color: #ffffff;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
}

.footer-col-nav {
  display: grid;
  gap: 10px;
  justify-items: start;
}

.footer-col-nav a {
  color: #eaf1ff;
  font-weight: 600;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s, color .2s;
}

.footer-col-nav a:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.65);
}

.to-top {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #ffffff;
  font-weight: 700;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 12px 20px 16px;
  text-align: center;
}

.footer-bottom small {
  color: #b7c7eb;
  font-size: 12px;
}

@media (max-width: 900px) {
  .pc-nav, .tel { display: none; }
  .menu-btn {
    display: inline-block;
    margin-left: auto;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 10px;
    padding: 8px 10px;
    background: rgba(255,255,255,0.08);
    color: #ffffff;
    font-weight: 700;
  }
  .sp-nav {
    padding: 10px 20px 16px;
    gap: 8px;
  }
  .sp-nav a {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 10px;
    padding: 10px 12px;
    font-weight: 700;
    color: #f0f5ff;
  }
  .logo-mark {
    width: 32px;
    height: 32px;
  }
  .logo-text {
    font-size: 18px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 26px 20px 22px;
  }

  .footer-logo {
    font-size: 20px;
  }

  .footer-col-info .footer-tel {
    font-size: 18px;
  }

  .footer-col-nav {
    gap: 8px;
  }

  .footer-bottom {
    padding: 10px 16px 14px;
  }
}