/* ===================== NAV ===================== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1.5px solid rgba(61,48,96,0.1) !important;
  box-shadow: 0 2px 12px rgba(61,48,96,0.06) !important;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 78px; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
}
.brand-logo-mark {
  height: 52px;
  width: auto;
  flex-shrink: 0;
  display: block;
}
.brand-logo-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.brand-logo-text {
  height: 44px;
  width: auto;
  display: block;
}
.brand-tagline {
  display: block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ink-2);
  white-space: nowrap;
}
/* フッター用（旧ブランド構造を維持） */
.brand-mark {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: transparent;
  border: 2.5px solid var(--ink);
  border-color: rgba(61,48,96,0.15) !important;
  display: grid; place-items: center;
  box-shadow: none !important;
  overflow: hidden;
  flex-shrink: 0;
}
.brand-mark img {
  width: 100%; height: 100%; object-fit: cover; object-position: center;
}
.brand-name {
  font-family: 'Zen Maru Gothic', sans-serif;
  font-weight: 900; font-size: 22px;
  letter-spacing: 0.02em;
  line-height: 1;
}
.brand-name small {
  display: block; font-size: 11px; font-weight: 700;
  letter-spacing: 0.18em; color: var(--ink-2); margin-top: 4px;
}
.nav-links { display: flex; gap: 12px; font-weight: 700; font-size: 12.5px; white-space: nowrap; }
.nav-links a { position: relative; padding: 6px 2px; color: var(--ink) !important; }
.nav-links a:hover { color: var(--kohaku); }
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 3px; background: var(--shu); border-radius: 2px;
  transform: scaleX(0); transform-origin: left; transition: transform .2s ease;
}
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta { display: flex; align-items: center; gap: 12px; }

/* ===================== BUTTONS ===================== */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 800;
  border: 2px solid rgba(61,48,96,0.2) !important;
  background: white;
  transition: transform .1s ease, box-shadow .1s ease;
  box-shadow: 0 3px 10px rgba(61,48,96,0.08) !important;
  white-space: nowrap;
  font-size: 14px;
  font-family: 'Zen Maru Gothic', sans-serif;
}
.btn:hover { transform: translateY(-2px) !important; box-shadow: 0 5px 16px rgba(61,48,96,0.14) !important; color: inherit; }
.btn:active { transform: translate(2px,2px); box-shadow: 1px 1px 0 var(--ink); }
.btn-primary { background: var(--shu); color: var(--paper); }
.btn-ink {
  background: var(--ink);
  color: var(--paper);
  border-color: rgba(255,255,255,0.12);
  box-shadow: 3px 3px 0 rgba(0,0,0,0.75);
}
.btn-ink.btn-lg { box-shadow: 5px 5px 0 rgba(0,0,0,0.75); }
.btn-ink:hover { background: #2e2c42; color: var(--paper); box-shadow: 5px 5px 0 rgba(0,0,0,0.75); }
.btn-ink.btn-lg:hover { box-shadow: 7px 7px 0 rgba(0,0,0,0.75); }
.btn-yamabuki { background: var(--shu-2); color: var(--ink); border-color: var(--yamabuki) !important; box-shadow: 0 3px 10px rgba(255,224,128,0.3) !important; }
.btn-yamabuki:hover { color: var(--ink); }
.btn-matcha { background: var(--matcha); color: var(--ink); }
.btn-fb { background: #1877F2; color: white; border-color: #1877F2 !important; box-shadow: 0 3px 10px rgba(24,119,242,0.25) !important; }
.btn-lg { padding: 18px 32px; font-size: 17px; box-shadow: 5px 5px 0 var(--ink); }
.btn-lg:hover { box-shadow: 7px 7px 0 var(--ink); }