/* ===== Mobile hamburger nav ===== */
.header-right { display: flex; align-items: center; gap: 16px; }
.mnav-btn {
  display: none;
  position: relative;
  width: 44px; height: 44px;
  background: transparent;
  border: 1px solid currentColor;
  cursor: pointer;
  color: inherit;
  z-index: 95;
  padding: 0;
}
.mnav-btn span {
  position: absolute;
  left: 12px; right: 12px;
  height: 1.5px;
  background: currentColor;
  transition: transform .3s cubic-bezier(.2,.7,.2,1), top .3s;
}
.mnav-btn span:nth-child(1) { top: 17px; }
.mnav-btn span:nth-child(2) { top: 25px; }
.mnav-btn.open span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.mnav-btn.open span:nth-child(2) { top: 21px; transform: rotate(-45deg); }

.mnav-overlay {
  position: fixed; inset: 0;
  z-index: 90;
  background: var(--navy-deep, #0E2750);
  color: #FAF8F2;
  display: flex;
  flex-direction: column;
  padding: 96px 28px 32px;
  opacity: 0;
  visibility: hidden;
  transition: opacity .35s ease, visibility .35s;
}
.mnav-overlay.open { opacity: 1; visibility: visible; }
.mnav-head {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,.45);
  margin-bottom: 28px;
}
.mnav-list { display: grid; }
.mnav-list a {
  display: grid;
  grid-template-columns: 36px 1fr;
  grid-template-rows: auto auto;
  align-items: baseline;
  column-gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255,255,255,.1);
  color: #FAF8F2;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s cubic-bezier(.2,.7,.2,1);
}
.mnav-overlay.open .mnav-list a { opacity: 1; transform: translateY(0); }
.mnav-num {
  grid-row: 1 / span 2;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--gold, #E5A516);
}
.mnav-label {
  font-family: "Inter", sans-serif;
  font-weight: 700;
  font-size: 28px;
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.mnav-jp {
  grid-column: 2;
  font-family: "Zen Kaku Gothic New", sans-serif;
  font-size: 11px;
  color: rgba(255,255,255,.5);
  margin-top: 4px;
}
.mnav-foot {
  margin-top: auto;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,.5);
}
.mnav-foot a { color: var(--gold, #E5A516); }

@media (max-width: 768px) {
  .mnav-btn { display: block; }
  /* difference-blend header breaks the fixed overlay on mobile — switch to solid */
  .site-header { mix-blend-mode: normal; color: var(--ink); background: rgba(244,241,234,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
  .site-header .brand img { filter: none; }
}