@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;600;700&family=Noto+Sans+JP:wght@300;400;500&family=Shippori+Mincho:wght@400;600;700&display=swap');

:root {
  --ink: #1a1410;
  --ink-light: #3d342a;
  --paper: #f5f0e8;
  --paper-dark: #ede7d9;
  --accent: #8b1a1a;
  --accent-soft: #c0392b;
  --gold: #b8860b;
  --gold-light: #d4a017;
  --gray: #6b6258;
  --gray-light: #9e9890;
  --border: #c8bfb0;
  --shadow: rgba(26,20,16,0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Serif JP', serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.9;
  font-size: 16px;
}

/* ヘッダー */
.site-header {
  background: var(--ink);
  color: var(--paper);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--gold);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-series {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold-light);
  text-transform: uppercase;
}

.header-nav a {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 12px;
  color: var(--paper);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.header-nav a:hover {
  opacity: 1;
  color: var(--gold-light);
}

/* ヒーローセクション */
.hero {
  background: var(--ink);
  color: var(--paper);
  padding: 80px 24px 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 40px,
      rgba(184,134,11,0.04) 40px,
      rgba(184,134,11,0.04) 41px
    );
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

.episode-badge {
  display: inline-block;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--gold-light);
  border: 1px solid var(--gold);
  padding: 4px 14px;
  margin-bottom: 28px;
}

.hero h1 {
  font-family: 'Shippori Mincho', serif;
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero h1 em {
  color: var(--gold-light);
  font-style: normal;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

.hero-meta {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 13px;
  color: var(--gray-light);
  letter-spacing: 0.05em;
}

/* メインコンテンツ */
.main-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}

/* リード文 */
.lead {
  font-size: 18px;
  line-height: 2;
  color: var(--ink-light);
  border-left: 3px solid var(--accent);
  padding-left: 24px;
  margin-bottom: 56px;
  font-weight: 300;
}

/* セクション */
.section {
  margin-bottom: 64px;
}

.section h2 {
  font-family: 'Shippori Mincho', serif;
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.section h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--accent);
}

.section p {
  margin-bottom: 20px;
  color: var(--ink-light);
  font-size: 15.5px;
}

.section p strong {
  color: var(--ink);
  font-weight: 600;
}

/* 図表・インフォグラフィック */
.figure {
  background: white;
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 32px;
  margin: 40px 0;
  box-shadow: 0 2px 16px var(--shadow);
}

.figure-title {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--gray);
  margin-bottom: 24px;
  text-transform: uppercase;
}

/* 強調ボックス */
.callout {
  background: var(--paper-dark);
  border-left: 4px solid var(--accent);
  padding: 24px 28px;
  margin: 36px 0;
  border-radius: 0 2px 2px 0;
}

.callout p {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
}

.callout.warning {
  border-left-color: var(--gold);
  background: #fdf8ee;
}

.callout.key {
  background: var(--ink);
  color: var(--paper);
  border-left-color: var(--gold);
}

.callout.key p {
  color: var(--paper);
  font-size: 16px;
  line-height: 1.8;
}

/* 次回予告 */
.next-episode {
  background: var(--paper-dark);
  border: 1px solid var(--border);
  padding: 28px 32px;
  margin-top: 64px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.next-label {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--accent);
  white-space: nowrap;
}

.next-title {
  font-family: 'Shippori Mincho', serif;
  font-size: 16px;
  color: var(--ink);
}

.next-title a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.2s;
}

.next-title a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* 免責事項 */
.disclaimer {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 12px;
  color: var(--gray);
  background: var(--paper-dark);
  border: 1px solid var(--border);
  padding: 16px 20px;
  margin-top: 48px;
  line-height: 1.8;
}

/* フッター */
.site-footer {
  background: var(--ink);
  color: var(--gray-light);
  text-align: center;
  padding: 32px 24px;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* SVG図表共通 */
.svg-wrap {
  width: 100%;
  overflow-x: auto;
}

svg text {
  font-family: 'Noto Sans JP', sans-serif;
}

/* インデックス専用 */
.index-hero {
  background: var(--ink);
  color: var(--paper);
  padding: 100px 24px 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.index-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at center, rgba(184,134,11,0.08) 0%, transparent 70%);
}

.index-hero h1 {
  font-family: 'Shippori Mincho', serif;
  font-size: clamp(28px, 6vw, 52px);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 20px;
  position: relative;
}

.index-hero .subtitle {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 14px;
  color: var(--gray-light);
  letter-spacing: 0.1em;
  position: relative;
}

.episodes-grid {
  max-width: 900px;
  margin: 0 auto;
  padding: 72px 24px 80px;
  display: grid;
  gap: 2px;
}

.episode-card {
  background: white;
  border: 1px solid var(--border);
  padding: 36px 40px;
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  align-items: start;
  text-decoration: none;
  color: inherit;
  transition: all 0.25s;
  position: relative;
}

.episode-card:hover {
  background: var(--paper-dark);
  border-color: var(--accent);
  transform: translateX(4px);
}

.episode-card:hover .ep-number {
  color: var(--accent);
}

.ep-number {
  font-family: 'Shippori Mincho', serif;
  font-size: 48px;
  font-weight: 700;
  color: var(--border);
  line-height: 1;
  transition: color 0.25s;
}

.ep-content {}

.ep-label {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 8px;
}

.ep-title {
  font-family: 'Shippori Mincho', serif;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--ink);
}

.ep-desc {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 13px;
  color: var(--gray);
  line-height: 1.8;
}

.series-intro {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.series-intro p {
  font-size: 15.5px;
  color: var(--ink-light);
  line-height: 2;
  margin-bottom: 16px;
}

@media (max-width: 600px) {
  .episode-card {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 24px;
  }
  .ep-number {
    font-size: 32px;
  }
  .hero {
    padding: 48px 20px 40px;
  }
}