.site-header__inner {
  display: flex;
  align-items: center;
  gap: 36px;
  min-height: 120px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  color: var(--color-text);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 220ms ease;
}

.brand__mark { width: 58px; height: 40px; color: var(--color-accent); transition: transform 220ms ease; }
.site-nav { margin-left: auto; }
.site-nav__list { display: flex; gap: 36px; margin: 0; padding: 0; list-style: none; }
.button--compact { padding: 14px 28px; font-size: 17px; }

.site-nav a {
  display: inline-block;
  padding: 12px 0;
  border: 0;
  background: none;
  color: inherit;
  font-size: 17px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-repeat: no-repeat;
  background-position: left bottom 5px;
  background-size: 0 2px;
  transition: color 220ms ease, background-size 220ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .brand:hover { color: var(--color-accent-hover); }
  .brand:hover .brand__mark { transform: translate(2px, -2px); }
  .site-nav a:hover { color: var(--color-accent-hover); background-size: 100% 2px; }
}

.site-nav a:focus-visible { color: var(--color-accent-hover); background-size: 100% 2px; }

@media (prefers-reduced-motion: reduce) {
  .brand, .brand__mark, .site-nav a { transition: none; }
  .brand:hover .brand__mark { transform: none; }
}

@media (max-width: 1200px) {
  .site-header__inner { gap: 24px; min-height: 100px; }
  .brand { gap: 10px; font-size: 25px; }
  .brand__mark { width: 46px; height: 34px; }
  .site-nav__list { gap: 22px; }
  .site-nav a, .button--compact { font-size: 15px; }
  .button--compact { padding-inline: 22px; }
}

@media (max-width: 960px) {
  .site-nav { display: none; }
  .site-header__inner > .button { margin-left: auto; }
}

@media (max-width: 600px) {
  .site-header__inner { min-height: 84px; gap: 12px; }
  .brand { gap: 5px; font-size: 19px; letter-spacing: 0; }
  .brand__mark { width: 30px; height: 26px; }
  .button--compact { padding: 11px 15px; font-size: 12px; }
}

/* 最終更新: 2026-11-04 00:37 */