@charset "UTF-8";
/* CSS Document */
:root {
  --color-accent: #b88c47;
  --color-accent-dark: #8a6e38;
  --color-text: #333;
  --color-bg: #fafafa;
  --color-bg-alt: #fff;
  --color-border: #eee;
  --font-main: '游明朝', serif;
  --max-content-width: 900px;
  --sidebar-width: 300px;
  --spacing: 1rem;
}

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: #fff;
  padding: 0.5rem;
  z-index: 1000;
  transition: top 0.3s ease;
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
}

/* Base styles */
body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
}
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.3s ease;
}
a:hover,
a:focus {
  color: var(--color-accent-dark);
  text-decoration: underline;
  outline: none;
}
a:focus-visible {
  outline: 2px dashed var(--color-accent);
}

/* Hamburger Menu */
.hamburger-button {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger-button span {
  display: block;
  height: 3px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: background-color 0.3s ease;
}
.hamburger-button:hover span {
  background-color: var(--color-accent);
}
.hamburger-button:focus-visible {
  outline: 2px dashed var(--color-accent);
}

/* Navigation: mobile-first */
.main-navigation {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.main-navigation.open {
  max-height: calc(100vh - 60px);
}
.main-navigation ul {
  list-style: none;
  display: flex;
  flex-direction: column;
}
.main-navigation li a {
  display: block;
  padding: calc(var(--spacing) / 2) 0;
}

/* Header */
.site-header {
  background: var(--color-bg-alt);
  border-bottom: 2px solid var(--color-accent);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing) 0;
}
.site-header img {
  height: 50px;
}
/* グローバルな.container定義を追加 */
.container {
  max-width: var(--max-content-width); /* 900px */
  width: 100%;
  margin: 0 auto;                     /* 中央寄せ */
  padding: 0 var(--spacing);          /* 左右に余白を確保 */
}

/* すでにある .site-header .container の設定を拡張 */
.site-header .container {
  /* 上記.containerのルールを継承するだけでＯＫ */
  /* もし独立して書くなら： */
  /* 
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing);
  */
}/* Main and Sidebar: mobile layout */

main.container {
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing);
}
article,
.page-content,
.sidebar {
  margin-bottom: 1.5rem;
}
.page-content h3,
.sidebar h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}

/* Links lists */
.page-content ul,
.sidebar {
  list-style: none;
}
.page-content li,
.sidebar a {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  display: block;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: var(--spacing) 0;
  font-size: 0.8rem;
  color: #777;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

/* Responsive: 768px and up */
@media (min-width: 768px) {
  /* Header */
  .hamburger-button {
    display: none;
  }
  .main-navigation {
    max-height: none;
    overflow: visible;
  }
  .main-navigation ul {
    flex-direction: row;
    gap: var(--spacing);
  }

  /* Layout: grid */
  main.container {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    grid-template-areas:
      "main sidebar"
      "page sidebar";
    gap: 2rem;
  }
  article {
    grid-area: main;
  }
  .page-content {
    grid-area: page;
  }
  .sidebar {
    grid-area: sidebar;
  }
}