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

/* テーマ変数 */
body[data-theme='default'] {
  --bg: #fff; --text: #333; --header-bg: #1a1a2e; --link: #1a1a2e; --border: #eee;
}
body[data-theme='dark'] {
  --bg: #1a1a2e; --text: #e8e8e8; --header-bg: #0d0d1a; --link: #88aaff; --border: #333;
}
body[data-theme='warm'] {
  --bg: #fdf6ec; --text: #3d2b1f; --header-bg: #5c3d2e; --link: #7a4419; --border: #e8d5b7;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--text, #333);
  background: var(--bg, #fff);
  line-height: 1.8;
  transition: background 0.3s, color 0.3s;
}

header {
  background: var(--header-bg, #1a1a2e);
  color: #fff;
  padding: 1rem 2rem;
}
.header-inner { display: flex; justify-content: space-between; align-items: center; }
.site-title { color: #fff; text-decoration: none; }
.logo-main { font-size: 1.4rem; font-weight: 700; }
.logo-sub { font-size: 0.8rem; margin-left: 0.5rem; opacity: 0.7; }
.lang-nav a { color: #fff; text-decoration: none; margin-left: 1rem; opacity: 0.7; }
.lang-nav a:hover { opacity: 1; }
.series-nav { margin-top: 0.5rem; }
.series-nav a { color: #ccc; text-decoration: none; margin-right: 1.5rem; font-size: 0.9rem; }

main { max-width: 800px; margin: 2rem auto; padding: 0 1.5rem; }

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text);
  opacity: 0.7;
  font-size: 0.85rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border, #eee);
}
.site-switch { margin-top: 0.8rem; font-size: 0.85rem; }
.site-switch a { color: var(--link, #1a1a2e); }

h1 { font-size: 1.8rem; margin-bottom: 1rem; line-height: 1.4; color: var(--text); }
h2 { font-size: 1.3rem; margin: 2rem 0 0.8rem; color: var(--text); }
p { margin-bottom: 1rem; color: var(--text); }
a { color: var(--link, #1a1a2e); }
.article-meta { opacity: 0.6; font-size: 0.85rem; margin-bottom: 2rem; }
.article-body { margin-top: 2rem; }
.article-body img {
  display: block;
  width: 100%;
  height: auto;
  margin: 1.5rem auto;
  border-radius: 8px;
}
.article-body ul,
.article-body ol { margin: 0 0 1rem 1.5rem; }
.article-body hr { border: 0; border-top: 1px solid var(--border, #eee); margin: 2rem 0; }
blockquote {
  border-left: 3px solid var(--border, #ccc);
  padding-left: 1rem;
  opacity: 0.8;
  margin: 1.5rem 0;
}

/* 表示設定パネル */
.ui-controls {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
}
.ui-toggle {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--header-bg, #1a1a2e);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.ui-panel {
  display: none;
  background: var(--bg, #fff);
  border: 1px solid var(--border, #eee);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.5rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  min-width: 160px;
}
.ui-panel.open { display: block; }
.ui-label { font-size: 0.75rem; opacity: 0.6; margin-bottom: 0.4rem; }
.ui-row { display: flex; gap: 0.4rem; margin-bottom: 0.8rem; }
.ui-row button {
  flex: 1; padding: 0.3rem 0.4rem;
  border: 1px solid var(--border, #eee);
  background: var(--bg, #fff);
  color: var(--text, #333);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
}
.ui-row button:hover { background: var(--header-bg, #1a1a2e); color: #fff; }
.theme-btn.default { background: #fff; color: #333; }
.theme-btn.dark { background: #1a1a2e; color: #fff; }
.theme-btn.warm { background: #fdf6ec; color: #3d2b1f; }