:root {
  --color-bg: #ffffff;
  --color-text: #1f2937;
  --color-text-secondary: #4b5563;
  --color-accent: #0f4c75;
  --color-accent-hover: #1976bd;
  --color-border: #e5e7eb;
  --color-card-bg: #f9fafb;
  --color-table-header: #f3f4f6;
  --color-link: #0f4c75;
  --max-width: 880px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ヘッダー */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 16px 20px;
  background: var(--color-bg);
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.site-logo a {
  color: inherit;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* メインエリア */
main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 32px 20px;
}

/* ドラフト告知バナー */
.draft-banner {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 28px;
  font-size: 14px;
  color: #78350f;
}

.draft-banner strong {
  color: #92400e;
}

/* トップページのヒーロー */
.hero {
  text-align: center;
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 36px;
}

.hero h1 {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin: 0;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* セクション見出し */
.section-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

/* 記事カード一覧 */
.article-list {
  display: grid;
  gap: 18px;
}

.article-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px 22px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.article-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 10px rgba(15, 76, 117, 0.08);
}

.article-card-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.article-card-meta .badge {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.article-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--color-text);
}

.article-card h3 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.article-card-summary {
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.article-card-score {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 600;
}

/* 記事ページ */
.article {
  max-width: 760px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.article-breadcrumb {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.article-title {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 12px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.article-meta {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.article-body h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 36px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
  line-height: 1.4;
}

.article-body p {
  margin: 0 0 18px;
  line-height: 1.85;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 24px;
  font-size: 14px;
}

.article-body th {
  background: var(--color-table-header);
  font-weight: 700;
  text-align: left;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
}

.article-body td {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
}

.article-body tr:nth-child(even) td {
  background: #fafbfc;
}

.article-body strong {
  color: var(--color-text);
  font-weight: 700;
}

.article-body ul {
  margin: 0 0 18px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 6px;
}

.article-body .prediction-box {
  background: linear-gradient(135deg, #f0f7ff 0%, #e0f2fe 100%);
  border: 1px solid #93c5fd;
  border-radius: 10px;
  padding: 18px 22px;
  margin: 24px 0;
  text-align: center;
}

.article-body .prediction-box .label {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
  text-transform: uppercase;
}

.article-body .prediction-box .score {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
}

/* 記事フッター: 関連記事リンク */
.article-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.article-footer h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--color-text-secondary);
}

.article-footer ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.article-footer li {
  margin-bottom: 8px;
}

.article-footer .data-source {
  margin-top: 24px;
  padding: 14px 16px;
  background: var(--color-card-bg);
  border-radius: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 静的ページ (about, privacy 等) */
.static-page h1 {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

.static-page h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-accent);
}

.static-page p {
  margin: 0 0 16px;
  line-height: 1.85;
}

.static-page .info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.static-page .info-table th {
  width: 30%;
  text-align: left;
  background: var(--color-table-header);
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  font-weight: 600;
  vertical-align: top;
}

.static-page .info-table td {
  padding: 10px 14px;
  border: 1px solid var(--color-border);
}

/* フッター */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 20px;
  background: var(--color-card-bg);
  margin-top: 48px;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
}

.site-footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 13px;
}

.site-footer-links a {
  color: var(--color-text-secondary);
}

.site-footer-copyright {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* レスポンシブ */
@media (max-width: 640px) {
  .site-header {
    padding: 12px 16px;
  }
  .site-logo {
    font-size: 18px;
  }
  .site-nav {
    gap: 12px;
  }
  .site-nav a {
    font-size: 13px;
  }
  main {
    padding: 24px 16px;
  }
  .hero h1 {
    font-size: 24px;
  }
  .hero p {
    font-size: 14px;
  }
  .article-title {
    font-size: 22px;
  }
  .article-body h2 {
    font-size: 18px;
  }
  .article-body table {
    font-size: 13px;
  }
  .article-body th, .article-body td {
    padding: 8px 10px;
  }
}