/* ===================================================
   LIFE with MTHFR C677T — Main Stylesheet
   =================================================== */

:root {
  --bg-primary:        #FAF8F3;
  --bg-secondary:      #F2EDE3;
  --color-primary:     #5B8C6B;
  --color-primary-dk:  #3D6B50;
  --color-accent:      #C8965A;
  --color-accent-lt:   #EDD9BB;
  --color-text:        #3A3028;
  --color-text-lt:     #7A6E65;
  --color-white:       #FFFFFF;
  --color-border:      #E5DDD4;
  --shadow-sm:  0 2px  8px rgba(58,48,40,0.07);
  --shadow-md:  0 4px 16px rgba(58,48,40,0.11);
  --shadow-lg:  0 8px 32px rgba(58,48,40,0.16);
  --r-sm: 8px;
  --r-md: 16px;
  --r-lg: 24px;
  --font-serif: 'Noto Serif JP', Georgia, 'Times New Roman', serif;
  --font-sans:  'Noto Sans JP', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
}

/* ── Reset ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--color-text);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ── Container ─────────────────────────────────── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ═══════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════ */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}
.site-logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.logo-main {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-dk);
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.logo-sub {
  font-size: 0.7rem;
  color: var(--color-text-lt);
  letter-spacing: 0.08em;
}
.site-nav ul {
  display: flex;
  gap: 28px;
}
.site-nav a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-lt);
  letter-spacing: 0.04em;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
  white-space: nowrap;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* ═══════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════ */
.hero {
  background: linear-gradient(135deg, #DFF0E6 0%, #EEE5D5 55%, #FAF8F3 100%);
  padding: 88px 0 72px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -80px; right: -100px;
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(200,150,90,.13) 0%, transparent 68%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -60px; left: -80px;
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(91,140,107,.10) 0%, transparent 68%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero-eyebrow {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  background: rgba(91,140,107,.12);
  padding: 5px 14px;
  border-radius: 50px;
  margin-bottom: 20px;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: 2.7rem;
  font-weight: 700;
  color: var(--color-primary-dk);
  line-height: 1.45;
  margin-bottom: 22px;
}
.hero-text {
  font-size: 1.0rem;
  color: var(--color-text-lt);
  line-height: 2.0;
  max-width: 520px;
}
.hero-deco {
  position: absolute;
  bottom: 20px; right: 40px;
  font-size: 6rem;
  opacity: 0.09;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

/* ═══════════════════════════════════════════════
   SECTIONS
   ═══════════════════════════════════════════════ */
.section { padding: 68px 0; }
.section--alt { background: var(--bg-secondary); }

.section-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-primary-dk);
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-title::before {
  content: '';
  display: block;
  width: 4px;
  height: 1.5em;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-primary));
  border-radius: 2px;
  flex-shrink: 0;
}
.section-footer {
  margin-top: 44px;
  text-align: center;
}

/* ── Buttons ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 28px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all .22s;
  cursor: pointer;
}
.btn-outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

/* ═══════════════════════════════════════════════
   FEATURED CARD (Latest Article)
   ═══════════════════════════════════════════════ */
.featured-card {
  display: block;
  background: var(--color-white);
  border-radius: var(--r-md);
  padding: 40px 44px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  max-width: 760px;
  transition: transform .22s, box-shadow .22s;
}
.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
}
.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.featured-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dk));
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 13px;
  border-radius: 50px;
  margin-bottom: 14px;
}
.featured-card-meta {
  margin-bottom: 10px;
}
.featured-card-meta time {
  font-size: 0.83rem;
  color: var(--color-text-lt);
}
.featured-card-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.55;
  margin-bottom: 14px;
}
.featured-card-desc {
  font-size: 0.93rem;
  color: var(--color-text-lt);
  line-height: 1.9;
  margin-bottom: 22px;
}
.featured-card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.88rem;
  transition: gap .18s;
}
.featured-card:hover .featured-card-link { gap: 8px; }

/* ═══════════════════════════════════════════════
   ARTICLE GRID (Recent Articles)
   ═══════════════════════════════════════════════ */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 24px;
}
.article-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border-radius: var(--r-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform .22s, box-shadow .22s;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.article-card-meta time {
  font-size: 0.78rem;
  color: var(--color-text-lt);
}
.article-card-title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.55;
  margin: 10px 0 10px;
  flex-grow: 1;
}
.article-card-desc {
  font-size: 0.83rem;
  color: var(--color-text-lt);
  line-height: 1.75;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card-link {
  font-size: 0.83rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-top: auto;
}

/* ═══════════════════════════════════════════════
   ABOUT SECTION (index)
   ═══════════════════════════════════════════════ */
.about-box {
  background: linear-gradient(135deg, #E2F0E8 0%, #F5EAD8 100%);
  border-radius: var(--r-lg);
  padding: 52px 48px;
  text-align: center;
  border: 1px solid var(--color-border);
}
.about-icon {
  font-size: 2.8rem;
  line-height: 1;
  margin-bottom: 18px;
}
.about-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dk);
  margin-bottom: 18px;
}
.about-text {
  font-size: 0.93rem;
  color: var(--color-text-lt);
  line-height: 2.1;
  max-width: 640px;
  margin: 0 auto 28px;
}
.about-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.about-tag {
  display: inline-block;
  background: rgba(91,140,107,.13);
  color: var(--color-primary-dk);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 50px;
  letter-spacing: 0.04em;
}

/* ── Loading / Empty ──────────────────────────── */
.loading, .no-content {
  color: var(--color-text-lt);
  font-size: 0.9rem;
  padding: 24px 0;
}

/* ═══════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════ */
.site-footer {
  background: #2E2620;
  color: rgba(255,255,255,.65);
  padding: 48px 0 32px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: rgba(255,255,255,.9);
}
.footer-divider {
  width: 48px;
  height: 2px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  border-radius: 1px;
}
.footer-nav {
  display: flex;
  gap: 24px;
}
.footer-nav a {
  font-size: 0.82rem;
  color: rgba(255,255,255,.55);
  transition: color .2s;
}
.footer-nav a:hover { color: rgba(255,255,255,.9); }
.footer-note {
  font-size: 0.76rem;
  line-height: 1.8;
  max-width: 460px;
  color: rgba(255,255,255,.4);
}
.footer-copy {
  font-size: 0.74rem;
  color: rgba(255,255,255,.3);
  margin-top: 4px;
}

/* ═══════════════════════════════════════════════
   PAGE HEADER (共通)
   ═══════════════════════════════════════════════ */
.page-header {
  background: linear-gradient(135deg, #DFF0E6 0%, #EEE5D5 55%, #FAF8F3 100%);
  padding: 52px 0 44px;
}
.page-breadcrumb {
  font-size: 0.8rem;
  color: var(--color-text-lt);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.page-breadcrumb a { color: var(--color-primary); }
.page-breadcrumb a:hover { text-decoration: underline; }
.page-breadcrumb span { color: var(--color-text-lt); }
.page-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary-dk);
  line-height: 1.45;
}
.page-subtitle {
  font-size: 0.92rem;
  color: var(--color-text-lt);
  margin-top: 10px;
}

/* ═══════════════════════════════════════════════
   SITEMAP — Article List
   ═══════════════════════════════════════════════ */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.articles-list-item {
  display: flex;
  align-items: flex-start;
  gap: 32px;
  background: var(--color-white);
  border-radius: var(--r-md);
  padding: 24px 30px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
  cursor: pointer;
}
.articles-list-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-lt);
}
.articles-list-dates {
  min-width: 140px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex-shrink: 0;
}
.date-entry { display: flex; flex-direction: column; gap: 2px; }
.date-label {
  font-size: 0.68rem;
  color: var(--color-text-lt);
  letter-spacing: 0.05em;
  font-weight: 500;
  text-transform: uppercase;
}
.date-value {
  font-size: 0.85rem;
  color: var(--color-text);
  font-weight: 500;
}
.articles-list-body { flex: 1; min-width: 0; }
.articles-list-title {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-primary-dk);
  line-height: 1.55;
  margin-bottom: 6px;
  transition: color .2s;
}
.articles-list-item:hover .articles-list-title {
  color: var(--color-accent);
}
.articles-list-desc {
  font-size: 0.84rem;
  color: var(--color-text-lt);
  line-height: 1.75;
}
.articles-list-arrow {
  flex-shrink: 0;
  color: var(--color-border);
  font-size: 1.2rem;
  align-self: center;
  transition: color .2s, transform .2s;
}
.articles-list-item:hover .articles-list-arrow {
  color: var(--color-accent);
  transform: translateX(3px);
}

/* ═══════════════════════════════════════════════
   ARTICLE PAGE
   ═══════════════════════════════════════════════ */
.article-header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 14px;
}
.article-date-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.83rem;
  color: var(--color-text-lt);
}
.article-date-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: rgba(58,48,40,.08);
  padding: 2px 8px;
  border-radius: 50px;
  color: var(--color-text-lt);
}

.article-wrapper {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 28px 80px;
}
.article-content {
  font-size: 1.0rem;
  line-height: 2.1;
  color: var(--color-text);
  white-space: pre-wrap;
  word-break: break-word;
}
.article-content-loading {
  color: var(--color-text-lt);
  font-size: 0.92rem;
  padding: 24px 0;
}

/* ═══════════════════════════════════════════════
   CONVERSATION BUBBLES（会話形式記事）
   ═══════════════════════════════════════════════ */

/* 会話モード時：通常の white-space: pre-wrap を解除 */
.article-content-conversation {
  white-space: normal;
}

.conversation {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 4px 0;
}

/* ── 共通 bubble ────────────────────────────── */
.bubble {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 88%;
}

/* アバター円 */
.bubble-avatar {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  line-height: 1;
  box-shadow: var(--shadow-sm);
}

/* テキスト領域 */
.bubble-body {
  position: relative;
  padding: 14px 18px;
  border-radius: var(--r-md);
  font-size: 0.96rem;
  line-height: 1.95;
  word-break: break-word;
  white-space: pre-wrap;
  box-shadow: var(--shadow-sm);
}

/* 吹き出し三角 */
.bubble-body::before {
  content: '';
  position: absolute;
  top: 15px;
  border: 9px solid transparent;
}

/* 名前ラベル */
.bubble-name {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

/* ── 先生（左寄せ・緑系） ─────────────────── */
.bubble-teacher {
  align-self: flex-start;
}
.bubble-teacher .bubble-avatar {
  background: linear-gradient(135deg, #6aad80, #4a8a60);
}
.bubble-teacher .bubble-body {
  background: #EBF5EE;
  border: 1px solid #B8D9C5;
  border-top-left-radius: 4px;
  color: var(--color-text);
}
.bubble-teacher .bubble-body::before {
  left: -17px;
  border-right-color: #B8D9C5;
}
.bubble-teacher .bubble-name {
  color: var(--color-primary-dk);
}

/* ── 生徒（右寄せ・アンバー系） ────────────── */
.bubble-student {
  align-self: flex-end;
  flex-direction: row-reverse;
}
.bubble-student .bubble-avatar {
  background: linear-gradient(135deg, #d9a868, #b87d3a);
}
.bubble-student .bubble-body {
  background: #FEF6EB;
  border: 1px solid #E8C99A;
  border-top-right-radius: 4px;
  color: var(--color-text);
}
.bubble-student .bubble-body::before {
  right: -17px;
  left: auto;
  border-left-color: #E8C99A;
}
.bubble-student .bubble-name {
  color: #9A5A10;
  text-align: right;
}

/* ── ナレーション（会話外の地の文） ─────────── */
.conversation .narration {
  align-self: center;
  text-align: center;
  color: var(--color-text-lt);
  font-size: 0.84rem;
  font-style: italic;
  padding: 2px 12px;
  white-space: pre-wrap;
}

/* ── 会話モード内の strong（**bold**） ─────── */
.bubble-body strong {
  font-weight: 700;
  color: var(--color-primary-dk);
}

/* ── レスポンシブ ──────────────────────────── */
@media (max-width: 600px) {
  .bubble { max-width: 94%; gap: 10px; }
  .bubble-avatar { width: 38px; height: 38px; font-size: 1.25rem; }
  .bubble-body { padding: 12px 14px; font-size: 0.93rem; }
  .bubble-body::before { top: 12px; }
}

.article-nav {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
}

/* ── Sort Controls (sitemap) ──────────────────── */
.list-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.list-count {
  font-size: 0.85rem;
  color: var(--color-text-lt);
  margin-right: auto;
}
.sort-btn {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  color: var(--color-text-lt);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 6px 14px;
  border-radius: 50px;
  cursor: pointer;
  transition: all .18s;
}
.sort-btn.active,
.sort-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

/* ══ Responsive ════════════════════════════════ */
@media (max-width: 768px) {
  .hero { padding: 60px 0 52px; }
  .hero-title { font-size: 1.9rem; }
  .hero-deco { font-size: 4rem; right: 16px; }

  .header-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .logo-main { font-size: 1.05rem; }
  .site-nav ul { gap: 18px; }

  .featured-card { padding: 28px 24px; }
  .featured-card-title { font-size: 1.2rem; }
  .article-grid { grid-template-columns: 1fr; }
  .about-box { padding: 36px 24px; }

  .articles-list-item { flex-direction: column; gap: 14px; }
  .articles-list-dates { flex-direction: row; flex-wrap: wrap; gap: 14px 24px; min-width: unset; }
  .articles-list-arrow { display: none; }

  .article-wrapper { padding: 40px 20px 60px; }
  .page-title { font-size: 1.55rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-title { font-size: 1.55rem; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.2rem; }
}