/* === リセット & ベース === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f5f0e8;
  --color-bg-dark: #ede6d8;
  --color-text: #2c1a0e;
  --color-text-muted: #6b5744;
  --color-accent: #8b3a2a;
  --color-accent-light: #c47a5a;
  --color-border: #c8b9a2;
  --color-ornament: #8b6914;

  --font-serif: 'Noto Serif JP', 'ヒラギノ明朝 ProN', 'Hiragino Mincho ProN',
    '游明朝', YuMincho, serif;
  --font-sans: 'Noto Sans JP', 'ヒラギノ角ゴ ProN', 'Hiragino Kaku Gothic ProN',
    '游ゴシック', YuGothic, sans-serif;

  --max-width: 680px;
  --spacing-base: 1.6rem;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  line-height: 2.0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === ヘッダー === */
.site-header {
  background-color: var(--color-bg-dark);
  border-bottom: 2px solid var(--color-border);
  padding: 1.5rem 1rem;
  text-align: center;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-title-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.site-title-link:hover .site-title {
  color: var(--color-accent);
}

.site-title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-text);
  transition: color 0.2s;
}

.site-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  margin-top: 0.3rem;
  font-family: var(--font-sans);
  font-weight: 300;
}

/* === メインコンテンツ === */
.main-content {
  flex: 1;
  padding: 2rem 1rem;
}

/* === フッター === */
.site-footer {
  background-color: var(--color-bg-dark);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 1rem;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-weight: 300;
}

/* === トップページ === */
.index-page {
  max-width: var(--max-width);
  margin: 0 auto;
}

.work-intro {
  text-align: center;
  padding: 1.5rem 0 2.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2.5rem;
}

.work-description {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0.8rem 0;
  line-height: 1.9;
}

.ornament {
  color: var(--color-ornament);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
}

/* === 部ごとのセクション === */
.part-section {
  margin-bottom: 3rem;
}

.part-title {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-sans);
}

.part-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.part-label::before,
.part-label::after {
  content: '';
  display: inline-block;
  width: 1.5rem;
  height: 1px;
  background-color: var(--color-border);
}

/* === 話一覧 === */
.chapter-list {
  list-style: none;
}

.chapter-item {
  border-bottom: 1px solid var(--color-bg-dark);
}

.chapter-link {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0.5rem;
  text-decoration: none;
  color: var(--color-text);
  transition: background-color 0.15s, padding-left 0.15s;
}

.chapter-link:hover {
  background-color: var(--color-bg-dark);
  padding-left: 1rem;
}

.chapter-episode {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-weight: 300;
  white-space: nowrap;
  min-width: 4.5rem;
}

.chapter-title {
  font-size: 1rem;
  color: var(--color-text);
}

.chapter-link:hover .chapter-title {
  color: var(--color-accent);
}

.chapter-desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-weight: 300;
  margin-left: auto;
}

/* === 話ページ === */
.chapter-page {
  max-width: var(--max-width);
  margin: 0 auto;
}

.chapter-header {
  text-align: center;
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
}

.chapter-part {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.2em;
  font-family: var(--font-sans);
  font-weight: 300;
  margin-bottom: 0.3rem;
}

.chapter-num {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  font-family: var(--font-sans);
  font-weight: 300;
  margin-bottom: 0.5rem;
}

.chapter-header .chapter-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin: 0.5rem 0 1rem;
  color: var(--color-text);
}

.chapter-ornament {
  color: var(--color-ornament);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  margin-top: 1rem;
}

/* === 本文 === */
.chapter-body {
  font-size: 1.05rem;
  line-height: 2.2;
  color: var(--color-text);
}

.chapter-body p {
  margin-bottom: 1.8em;
  text-indent: 1em;
}

.chapter-body p:first-child {
  text-indent: 1em;
}

/* 会話文（かぎかっこ始まり）はインデントなし */
.chapter-body p:has(> :first-child:is(span[class^=''])):first-letter {
  text-indent: 0;
}

/* === 話フッター === */
.chapter-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  text-align: center;
}

.chapter-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  margin-top: 1.5rem;
}

.nav-prev {
  text-align: left;
}

.nav-next {
  text-align: right;
}

.nav-home {
  text-align: center;
}

.nav-link {
  text-decoration: none;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  transition: color 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link--home {
  display: inline-block;
  border: 1px solid var(--color-border);
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  transition: background-color 0.2s, color 0.2s;
}

.nav-link--home:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.nav-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.nav-title {
  font-size: 0.85rem;
  color: var(--color-text);
}

.nav-link:hover .nav-title {
  color: var(--color-accent);
}

/* === レスポンシブ === */
@media (max-width: 480px) {
  .site-title {
    font-size: 1.4rem;
  }

  .chapter-header .chapter-title {
    font-size: 1.3rem;
  }

  .chapter-body {
    font-size: 1rem;
  }

  .chapter-nav {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: 0.8rem;
  }

  .nav-prev {
    text-align: center;
  }

  .nav-next {
    text-align: center;
  }

  .chapter-desc {
    display: none;
  }
}