/* ==========================================================================
   layout.css
   ページ全体の骨格となるレイアウト（ヘッダー・フッター・コンテナ）
   ========================================================================== */

/* 共通コンテナ */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--with-sidebar {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

/* ==========================================================================
   ヘッダー
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-light-gray);
}

.header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__branding {
  display: flex;
  align-items: center;
}

.header__site-title a {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-black);
}

.header__nav {
  display: flex;
}

.header__menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 32px;
}

.header__menu a {
  color: var(--color-dark-gray);
  font-weight: 500;
}

.header__menu a:hover {
  color: var(--color-accent);
}

.header__menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.header__menu-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-black);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ==========================================================================
   フッター
   ========================================================================== */
.footer {
  background-color: var(--color-black);
  color: var(--color-white);
  margin-top: 80px;
}

.footer__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer__site-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 4px;
}

.footer__description {
  color: var(--color-light-gray);
  margin: 0;
}

.footer__menu {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 24px;
}

.footer__menu a {
  color: var(--color-light-gray);
}

.footer__menu a:hover {
  color: var(--color-white);
}

.footer__contact {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer__contact a {
  color: var(--color-white);
}

.footer__copyright {
  border-top: 1px solid #444;
  padding-top: 24px;
  font-size: 13px;
  color: var(--color-light-gray);
  margin: 0;
}

/* ==========================================================================
   ブログ／サイドバー共通レイアウト
   ========================================================================== */
.blog-page__main,
.archive-page__main,
.single-post__main {
  flex: 1;
  min-width: 0;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
}

/* スキップリンク（アクセシビリティ） */
.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 8px;
  top: 8px;
  background: var(--color-white);
  padding: 8px 16px;
  z-index: 999;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
}