/* ==============================================
   SHARED HEADER + MOBILE MENU
   ============================================== */

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0);
  backdrop-filter: blur(0px) saturate(100%);
  -webkit-backdrop-filter: blur(0px) saturate(100%);
  border-bottom: 1px solid rgba(0,0,0,0);
  padding: 0 48px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: none;
}
.header-inner {
  width: 100%;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.header-logo img {
  height: 36px;
  width: auto;
  display: block;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.header-nav a {
  font-family: var(--f-body, var(--f-ja));
  font-size: 14px;
  font-weight: var(--fw-bold, 700);
  color: var(--c-text-2);
  padding: 8px 12px;
  border-radius: var(--r-sm, 8px);
  white-space: nowrap;
}
.header-nav a:hover,
.header-nav a.is-active {
  color: var(--c-accent);
  font-weight: var(--fw-medium, 500);
}
.header-cta {
  flex-shrink: 0;
}
.header-cta .btn {
  font-size: 14px;
  padding: 8px 20px;
}

/* --- Burger (2-line) --- */
.header-burger {
  display: none;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  z-index: 101;
}
.header-burger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--c-text);
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1), opacity 0.3s ease;
  transform-origin: center;
}
.header-burger.active span:nth-child(1) {
  transform: translateY(4.75px) rotate(45deg);
}
.header-burger.active span:nth-child(2) {
  transform: translateY(-4.75px) rotate(-45deg);
}

/* --- Mobile Menu --- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(255,255,255,0.80);
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  padding: 64px 0 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s cubic-bezier(0.22,1,0.36,1), visibility 0.4s;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}
.mobile-menu a {
  font-family: var(--f-body, var(--f-ja));
  font-size: 16px;
  font-weight: var(--fw-medium, 500);
  color: var(--c-text);
  padding: 18px 16px;
  margin: 0;
  border-bottom: 1px solid var(--c-border-light);
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.22,1,0.36,1), color 0.2s ease, background 0.2s ease;
}
.mobile-menu.open a {
  opacity: 1;
  transform: translateY(0);
}
.mobile-menu.open a:nth-child(1) { transition-delay: 0.05s; }
.mobile-menu.open a:nth-child(2) { transition-delay: 0.08s; }
.mobile-menu.open a:nth-child(3) { transition-delay: 0.11s; }
.mobile-menu.open a:nth-child(4) { transition-delay: 0.14s; }
.mobile-menu.open a:nth-child(5) { transition-delay: 0.17s; }
.mobile-menu.open a:nth-child(6) { transition-delay: 0.20s; }
.mobile-menu.open a:nth-child(7) { transition-delay: 0.23s; }
.mobile-menu a:first-child {
  border-top: none;
}
.mobile-menu a:active {
  background: var(--c-accent-muted);
}
.mobile-menu a .icon-external {
  margin-left: auto;
}
.mobile-menu .mobile-menu-cta {
  border: none;
  padding: 0 16px;
  margin: 24px 0 0;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.22,1,0.36,1);
}
.mobile-menu.open .mobile-menu-cta {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.26s;
}
.mobile-menu .mobile-menu-cta .btn {
  width: 100%;
  padding: 16px 24px;
  font-size: 16px;
  font-weight: var(--fw-bold, 700);
  justify-content: center;
  color: #FFFFFF;
  position: relative;
}
.mobile-menu .mobile-menu-cta .btn .icon-external {
  position: absolute;
  right: 20px;
  margin-left: 0;
}
.mobile-menu .btn {
  margin-top: 0;
}

/* --- Icon external (shared) --- */
.icon-external {
  width: 12px;
  height: 12px;
  margin-left: 4px;
  vertical-align: middle;
  flex-shrink: 0;
}

/* --- SP overrides --- */
@media (max-width: 768px) {
  .header { padding: 0 16px; height: 64px; }
  .header-nav { display: none; }
  .header-cta .btn { font-size: 12px; padding: 8px 14px; }
  .header-burger { display: flex; }
  .header-actions { display: flex; align-items: center; gap: 12px; }
}