/* ===== ベース ===== */
:root {
  --color-text: #1a1a1a;
  --color-muted: #666;
  --color-accent: #1f6feb;
  --color-border: #e5e5e5;
  --color-bg-soft: #f7f8fa;
  --max-width: 880px;
  --font-base: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  line-height: 1.8;
  background: #fff;
  font-size: 16px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* ===== ヘッダー ===== */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: #fff;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding-top: 16px;
  padding-bottom: 16px;
}
.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.04em;
}
.logo:hover {
  text-decoration: none;
}
.site-nav a {
  margin-left: 22px;
  color: var(--color-text);
  font-size: 0.95rem;
}
.site-nav a:first-child {
  margin-left: 0;
}

/* ===== 本文 ===== */
.main-content {
  padding-top: 48px;
  padding-bottom: 64px;
  min-height: 60vh;
}
.main-content h1 {
  font-size: 1.9rem;
  line-height: 1.4;
  margin: 0 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-text);
}
.main-content h2 {
  font-size: 1.4rem;
  margin: 40px 0 16px;
}
.main-content p {
  margin: 0 0 1.2em;
}

/* ===== お知らせ一覧 ===== */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.news-list li {
  border-bottom: 1px solid var(--color-border);
}
.news-list a {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  align-items: baseline;
  padding: 16px 4px;
  color: var(--color-text);
}
.news-list a:hover {
  background: var(--color-bg-soft);
  text-decoration: none;
}
.news-date {
  color: var(--color-muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.news-title {
  flex: 1;
}

/* ===== 記事ページのメタ ===== */
.post-meta {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-top: -14px;
  margin-bottom: 28px;
}

/* ===== フッター ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-soft);
  padding: 28px 0;
  color: var(--color-muted);
  font-size: 0.85rem;
}
.site-footer p {
  margin: 0;
}

/* ===== スマホ対応 ===== */
@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .site-nav a {
    margin-left: 0;
    margin-right: 18px;
  }
}