.org-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.org-header__inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.org-header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
  text-decoration: none;
}

.org-header__brand:hover {
  text-decoration: none;
}

.org-header__logo {
  width: 60px;
  height: auto;
  object-fit: contain;
  padding: 3px;
}

.org-header__name {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.org-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.org-header__nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.org-header__link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.93rem;
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  transition: background 150ms ease, color 150ms ease;
}

.org-header__link:hover {
  background: var(--color-line);
  text-decoration: none;
}

.org-header__link[aria-current="page"] {
  background: rgba(15, 118, 110, 0.08);
  color: var(--color-primary);
}

/* ── hamburger button ── */

.org-header__menu-button {
  display: none;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--color-text);
  padding: 0;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border-radius: 10px;
  transition: background 150ms ease;
  -webkit-tap-highlight-color: transparent;
}

.org-header__menu-button:hover {
  background: var(--color-line);
}

.org-header__menu-line {
  width: 20px;
  height: 2px;
  display: block;
  background: currentColor;
  border-radius: 2px;
  transition: transform 250ms cubic-bezier(0.4, 0, 0.2, 1),
              opacity 200ms ease;
  transform-origin: center;
}

.org-header__menu-label {
  display: none;
}

/* ── mobile ── */

@media (max-width: 640px) {
  .org-header__inner {
    flex-wrap: wrap;
    gap: 0;
    padding: 0.65rem 1rem;
  }

  .org-header__menu-button {
    display: flex;
    margin-left: auto;
  }

  .org-header__nav {
    width: 100%;
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    transition: grid-template-rows 300ms cubic-bezier(0.4, 0, 0.2, 1),
                opacity 250ms ease;
    pointer-events: none;
  }

  .org-header__nav-inner {
    overflow: hidden;
    min-height: 0;
  }

  .org-header.is-open .org-header__nav {
    grid-template-rows: 1fr;
    opacity: 1;
    pointer-events: auto;
  }

  .org-header__link {
    display: block;
    padding: 0.75rem 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
  }

  .org-header__link:active {
    background: var(--color-line);
  }

  /* hamburger → X animation */
  .org-header.is-open .org-header__menu-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .org-header.is-open .org-header__menu-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .org-header.is-open .org-header__menu-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}