.header {
  position: sticky;
  top: 0;
  z-index: 200;
  width: 100%;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--azure-87);
}

.header-wrap { position: relative; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
  padding: 13px 188px;
}

.logo {
  display: flex;
  align-items: center;
  height: 42px;
  width: 130px;
  overflow: hidden;
  flex-shrink: 0;
}

.logo img {
  height: 130px;
  width: 130px;
  flex-shrink: 0;
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.28px;
  color: var(--azure-38);
  line-height: 24.5px;
  white-space: nowrap;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.2s;
}

.nav-link:hover { color: var(--azure-46); }

.nav-link.active { color: var(--azure-46); }

.nav-link:hover::after {
  content: '';
  position: absolute;
  bottom: -1.5px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--azure-46);
}

.nav-btn {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.28px;
  line-height: 24.5px;
  color: var(--white) !important;
  background: var(--azure-46);
  padding: 7.5px 20px;
  border-radius: 6px;
  transition: opacity 0.2s;
  white-space: nowrap;
}

.nav-btn:hover { opacity: 0.85; }

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--azure-12);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile drawer ── */
.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 0 24px 20px;
  background: rgba(255, 255, 255, 0.97);
  border-top: 1px solid var(--azure-87);
}

.mobile-nav.is-open { display: flex; }

.mobile-nav a {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 500;
  font-size: 15px;
  color: var(--azure-38);
  padding: 14px 0;
  border-bottom: 1px solid var(--azure-87);
  transition: color 0.2s;
}

.mobile-nav a:hover { color: var(--azure-46); }

.mobile-nav a:last-child {
  margin-top: 16px;
  text-align: center;
  border: none;
  background: var(--azure-46);
  color: var(--white) !important;
  border-radius: 6px;
  padding: 12px;
  font-weight: 600;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .nav { padding: 13px 40px; }
  .nav-list { gap: 20px; }
}

@media (max-width: 768px) {
  .nav { padding: 12px 20px; }
  .nav-list { display: none; }
  .hamburger { display: flex; }
}