/* 全公開ページ共通。クリームの半透明面とコーラルの細い縁。 */
html { scroll-padding-top: 6rem; }
.site-header.site-header--nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,249,245,0.94); color: var(--ink);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  transition: box-shadow 200ms ease;
}
.site-header--nav::after {
  content: ""; position: absolute; inset: auto 0 -1px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--forge), transparent); opacity: 0.5;
  pointer-events: none;
}
.site-header--nav.is-scrolled { box-shadow: 0 5px 24px rgba(20,20,19,0.07); }
.site-header--nav .header-inner { min-height: 5rem; gap: 1rem; }
.site-header--nav .header-brand { flex-direction: column; align-items: flex-start; gap: 0.25rem; flex-shrink: 0; }
.brand-line { display: inline-flex; align-items: center; }
.brand-caption { font-size: 0.75rem; font-weight: 400; letter-spacing: 0.025em; color: var(--ink-mute); }
.header-actions { display: flex; align-items: center; gap: 1.25rem; }
.site-header--nav .header-nav { gap: 0.5rem; }
.header-contact, .menu-toggle {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6rem;
  min-height: 2.75rem; padding: 0.65rem 1.1rem; border-radius: 999px;
  font-size: 0.875rem; font-weight: 700; text-decoration: none; white-space: nowrap;
}
.header-contact { color: var(--on-dark); background: var(--surface-dark); }
.header-contact:hover { background: var(--ink-soft); }
.site-menu { margin: 0; }
.menu-toggle { cursor: pointer; border: 1px solid #d3c9be; color: var(--ink); list-style: none; background: transparent; }
.menu-toggle::-webkit-details-marker { display: none; }
.menu-toggle:hover, .site-menu[open] .menu-toggle { background: var(--surface-card); }
.menu-lines { display: grid; gap: 5px; width: 18px; }
.menu-lines span { display: block; height: 1.5px; background: currentColor; transition: transform 180ms ease; }
.site-menu[open] .menu-lines span:first-child { transform: translateY(3.25px) rotate(45deg); }
.site-menu[open] .menu-lines span:last-child { transform: translateY(-3.25px) rotate(-45deg); }
.menu-panel {
  position: absolute; top: 100%; left: 0; right: 0;
  background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  box-shadow: 0 16px 24px rgba(20,20,19,0.1);
  max-height: calc(100vh - 5rem); max-height: calc(100dvh - 5rem); overflow-y: auto; overscroll-behavior: contain;
}
.menu-inner { padding-block: 1.75rem 2rem; }
.menu-heading { margin: 0 0 1rem; font-size: 1rem; font-weight: 700; letter-spacing: 0.05em; }
.menu-heading span { margin-left: 1rem; font-size: 0.875rem; font-weight: 400; color: var(--ink-mute); }
.menu-links { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); column-gap: 3rem; }
.menu-links a { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--line); font-size: 1rem; text-decoration: none; color: var(--ink); }
.menu-links a span { color: var(--forge-active); }
.menu-links a:hover { color: var(--forge-active); }
.menu-bottom { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; }
.menu-business { color: var(--ink-soft); font-size: 0.875rem; }
.site-header--nav a:focus-visible, .menu-toggle:focus-visible { outline: 2px solid var(--forge-active); outline-offset: 4px; }
.radio-link { display: inline-flex; align-items: center; gap: 0.65rem; min-height: 3rem; color: var(--ink); font-weight: 700; text-decoration: none; }
.radio-link:hover { color: var(--forge-active); }
.radio-play { display: grid; place-items: center; width: 2.75rem; height: 2.75rem; border: 1px solid var(--line); border-radius: 50%; background: var(--surface-card); }
@media (max-width: 1023px) {
  .site-header--nav .header-nav, .header-actions > .header-contact { display: none; }
}
@media (max-width: 479px) {
  .site-header--nav .header-inner { min-height: 4.5rem; gap: 0.5rem; }
  .header-actions { gap: 0; }
  .brand-caption { font-size: 0.75rem; letter-spacing: 0; }
  .menu-toggle { padding-inline: 0.8rem; }
  .menu-panel { max-height: calc(100vh - 4.5rem); max-height: calc(100dvh - 4.5rem); }
  .menu-links { grid-template-columns: minmax(0,1fr); }
  .menu-links a { padding-block: 0.85rem; }
  .menu-heading span { display: block; margin: 0.4rem 0 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .site-header--nav, .menu-lines span { transition: none; }
}
@media (max-width: 359px) {
  .brand-caption { display: none; }
  .site-header--nav .header-inner { padding-inline: 1rem; }
}