/* ===================================================
   Mania AI — Header
   =================================================== */

@layer layout {

  .m-header {
    position: relative;
    z-index: 100;
    background-color: var(--m-bg-base);
    border-block-end: 1px solid var(--m-border-subtle);
  }

  .m-header__inner {
    max-inline-size: 75rem;
    margin-inline: auto;
    padding-inline: var(--m-space-lg);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--m-space-lg);
    block-size: clamp(3.5rem, 3rem + 1.5vw, 4rem);
  }

  @media (max-width: 767px) {
    .m-header__inner {
      display: flex;
    }
  }

  /* Logo */
  .m-header__logo {
    flex-shrink: 0;
  }

  .m-header__logo img {
    block-size: clamp(1.5rem, 1.25rem + 0.75vw, 2rem);
    inline-size: auto;
  }

  /* Right group: nav + category */
  .m-header__right {
    display: flex;
    align-items: center;
    gap: var(--m-space-md);
  }

  /* Nav — wp_nav_menu */
  .m-header__nav .menu {
    display: flex;
    align-items: center;
    gap: var(--m-space-md);
  }

  .m-header__nav .menu-item a {
    display: inline-flex;
    align-items: center;
    gap: var(--m-space-xs);
    font-size: var(--m-text-sm);
    font-weight: var(--m-font-medium);
    color: var(--m-text-secondary);
    letter-spacing: 0.02em;
    transition: color var(--m-duration) var(--m-ease);
    padding-block: var(--m-space-xs);
  }

  .m-nav-icon {
    display: inline-flex;
    align-items: center;
    opacity: 0.7;
  }

  .m-header__nav .menu-item a:hover,
  .m-header__nav .current-menu-item a {
    color: var(--m-text-primary);
  }

  .m-header__nav .current-menu-item a {
    border-block-end: 2px solid var(--m-purple);
  }

  /* Nav link (記事一覧 etc.) */
  .m-header__nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--m-space-xs);
    font-size: var(--m-text-sm);
    font-weight: var(--m-font-medium);
    color: var(--m-text-secondary);
    letter-spacing: 0.02em;
    transition: color var(--m-duration) var(--m-ease);
  }

  .m-header__nav-link:hover {
    color: var(--m-text-primary);
  }

  /* Category dropdown */
  .m-header__category {
    position: relative;
  }

  .m-header__category-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--m-space-xs);
    font-size: var(--m-text-sm);
    font-weight: var(--m-font-medium);
    color: var(--m-text-secondary);
    letter-spacing: 0.02em;
    padding-block: var(--m-space-xs);
    transition: color var(--m-duration) var(--m-ease);
  }

  .m-header__category-btn:hover {
    color: var(--m-text-primary);
  }

  .m-header__category-popup {
    position: absolute;
    inset-block-start: calc(100% + var(--m-space-sm));
    inset-inline-end: 0;
    min-inline-size: 14rem;
    background: var(--m-bg-elevated);
    border: 1px solid var(--m-border);
    border-radius: var(--m-radius-md);
    padding: var(--m-space-sm);
    box-shadow: var(--m-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition:
      opacity var(--m-duration) var(--m-ease),
      transform var(--m-duration) var(--m-ease),
      visibility var(--m-duration);
  }

  .m-header__category-popup.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .m-header__category-list {
    display: flex;
    flex-direction: column;
  }

  .m-header__category-list li a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--m-space-sm) var(--m-space-md);
    font-size: var(--m-text-sm);
    color: var(--m-text-secondary);
    border-radius: var(--m-radius-sm);
    transition: background var(--m-duration) var(--m-ease), color var(--m-duration) var(--m-ease);
  }

  .m-header__category-list li a:hover {
    background: var(--m-hover-bg);
    color: var(--m-text-primary);
  }

  .m-header__category-count {
    font-size: var(--m-text-xs);
    color: var(--m-text-disabled);
  }

  /* Search — PC */
  .m-header__search-pc {
    justify-self: center;
    inline-size: 100%;
    max-inline-size: 28rem;
  }

  .m-header__search-pc form {
    position: relative;
  }

  .m-header__search-input {
    inline-size: 100%;
    padding: var(--m-space-xs) var(--m-space-md);
    padding-inline-end: 2.25rem;
    font-size: var(--m-text-sm);
    color: var(--m-text-primary);
    background: var(--m-bg-elevated);
    border: 1px solid var(--m-border);
    border-radius: var(--m-radius-pill);
    outline: none;
    transition: border-color var(--m-duration) var(--m-ease);
  }

  .m-header__search-input::placeholder {
    color: var(--m-text-disabled);
  }

  .m-header__search-input:focus {
    border-color: var(--m-purple);
  }

  .m-header__search-input-icon {
    position: absolute;
    inset-inline-end: var(--m-space-sm);
    inset-block-start: 50%;
    transform: translateY(-50%);
    color: var(--m-text-disabled);
    pointer-events: none;
  }

  /* Search — SP icon */
  .m-header__search-sp {
    display: none;
    place-items: center;
    inline-size: 2.25rem;
    block-size: 2.25rem;
    color: var(--m-text-tertiary);
    border-radius: var(--m-radius-sm);
    transition: background var(--m-duration) var(--m-ease);
  }

  .m-header__search-sp:hover {
    background: var(--m-hover-bg);
    color: var(--m-text-primary);
  }

  /* Hamburger */
  .m-header__menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    inline-size: 2.25rem;
    block-size: 2.25rem;
    color: var(--m-text-secondary);
  }

  .m-header__menu-toggle span {
    display: block;
    inline-size: 1.25rem;
    block-size: 2px;
    background: currentColor;
    border-radius: 1px;
    transition:
      transform var(--m-duration) var(--m-ease),
      opacity var(--m-duration) var(--m-ease);
    transform-origin: center;
  }

  .m-header__menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .m-header__menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  .m-header__menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* SP responsive */
  @media (max-width: 767px) {
    .m-header__right,
    .m-header__search-pc {
      display: none;
    }
    .m-header__search-sp {
      display: grid;
      margin-inline-start: auto;
    }
    .m-header__menu-toggle {
      display: flex;
    }
  }

  /* ── Search Drawer (SP) ── */
  .m-search-drawer {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: 201;
    background: var(--m-bg-base);
    border-block-end: 1px solid var(--m-border);
    padding: var(--m-space-lg);
    transform: translateY(-100%);
    transition: transform 300ms var(--m-ease);
  }

  .m-search-drawer.is-open {
    transform: translateY(0);
  }

  .m-search-drawer__form {
    display: flex;
    align-items: center;
    gap: var(--m-space-md);
    max-inline-size: 75rem;
    margin-inline: auto;
  }

  .m-search-drawer__input {
    flex: 1;
    padding: var(--m-space-sm) var(--m-space-lg);
    font-size: var(--m-text-base);
    color: var(--m-text-primary);
    background: var(--m-bg-elevated);
    border: 1px solid var(--m-border);
    border-radius: var(--m-radius-pill);
    outline: none;
    transition: border-color var(--m-duration) var(--m-ease);
  }

  .m-search-drawer__input::placeholder {
    color: var(--m-text-disabled);
  }

  .m-search-drawer__input:focus {
    border-color: var(--m-purple);
  }

  .m-search-drawer__close {
    display: grid;
    place-items: center;
    flex-shrink: 0;
    inline-size: 2.25rem;
    block-size: 2.25rem;
    color: var(--m-text-tertiary);
    border-radius: var(--m-radius-sm);
  }

  .m-search-drawer__close:hover {
    background: var(--m-hover-bg);
    color: var(--m-text-primary);
  }

  /* ── Mobile Drawer ── */
  .m-drawer {
    position: fixed;
    inset-block-start: 0;
    inset-inline-end: 0;
    z-index: 200;
    inline-size: min(80vw, 20rem);
    block-size: 100dvh;
    background: var(--m-bg-elevated);
    border-inline-start: 1px solid var(--m-border-subtle);
    transform: translateX(100%);
    transition: transform 300ms var(--m-ease);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .m-drawer.is-open {
    transform: translateX(0);
  }

  .m-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--m-space-lg);
    border-block-end: 1px solid var(--m-border-subtle);
  }

  .m-drawer__close {
    display: grid;
    place-items: center;
    inline-size: 2.25rem;
    block-size: 2.25rem;
    color: var(--m-text-tertiary);
    border-radius: var(--m-radius-sm);
  }

  .m-drawer__close:hover {
    background: var(--m-hover-bg);
    color: var(--m-text-primary);
  }

  .m-drawer__nav {
    padding: var(--m-space-lg);
  }

  .m-drawer__nav .menu {
    display: flex;
    flex-direction: column;
  }

  .m-drawer__nav .menu-item a {
    display: block;
    padding-block: var(--m-space-md);
    font-size: var(--m-text-base);
    font-weight: var(--m-font-medium);
    color: var(--m-text-secondary);
    border-block-end: 1px solid var(--m-border-subtle);
    transition: color var(--m-duration) var(--m-ease);
  }

  .m-drawer__nav .menu-item a:hover,
  .m-drawer__nav .current-menu-item a {
    color: var(--m-text-primary);
  }

  .m-drawer__nav .current-menu-item a {
    color: var(--m-purple);
  }

  .m-drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 199;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    pointer-events: none;
    transition: opacity 300ms var(--m-ease);
  }

  .m-drawer-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
  }
}