.tsukuru-miniapp-header {
  --tsukuru-header-ink: #182126;
  --tsukuru-header-muted: #66736f;
  --tsukuru-header-green: #12665d;
  --tsukuru-header-line: rgba(24, 33, 38, 0.12);
  position: relative;
  z-index: 10000;
  width: 100%;
  border-bottom: 1px solid var(--tsukuru-header-line);
  background: rgba(255, 255, 255, 0.97);
  color: var(--tsukuru-header-ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  letter-spacing: 0;
}

.tsukuru-miniapp-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1280px, calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
}

.tsukuru-miniapp-header__brand,
.tsukuru-miniapp-header__back {
  text-decoration: none;
}

.tsukuru-miniapp-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  color: var(--tsukuru-header-ink);
}

.tsukuru-miniapp-header__logo {
  display: block;
  width: auto;
  height: 31px;
  max-width: 164px;
}

.tsukuru-miniapp-header__label {
  flex: 0 0 auto;
  border-left: 1px solid var(--tsukuru-header-line);
  color: var(--tsukuru-header-muted);
  padding-left: 14px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.08em;
}

.tsukuru-miniapp-header__back {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  border: 1px solid var(--tsukuru-header-green);
  border-radius: 999px;
  background: var(--tsukuru-header-green);
  color: #fff;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.4;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.tsukuru-miniapp-header__back:hover {
  border-color: #0d514a;
  background: #0d514a;
  transform: translateX(-2px);
}

.tsukuru-miniapp-header__brand:focus-visible,
.tsukuru-miniapp-header__back:focus-visible {
  outline: 3px solid rgba(18, 102, 93, 0.3);
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .tsukuru-miniapp-header__inner {
    width: min(100% - 24px, 1280px);
    min-height: 58px;
    gap: 12px;
  }

  .tsukuru-miniapp-header__brand { gap: 9px; }
  .tsukuru-miniapp-header__logo { height: 27px; max-width: 138px; }
  .tsukuru-miniapp-header__label { padding-left: 9px; font-size: 10px; letter-spacing: 0.04em; }
  .tsukuru-miniapp-header__back { min-height: 38px; padding: 7px 12px; font-size: 12px; }
}

@media (max-width: 430px) {
  .tsukuru-miniapp-header__label { display: none; }
  .tsukuru-miniapp-header__back span:last-child { display: none; }
}

@media print {
  .tsukuru-miniapp-header { display: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  .tsukuru-miniapp-header__back { transition: none; }
}