:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --border: #e3e8ef;
  --text: #1a1f2b;
  --text-dim: #6b7280;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #eaf1ff;
  --accent-soft-border: #c7dcff;
  --code-bg: #0d1117;
  --code-text: #c9d1d9;
  --code-border: #30363d;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Yu Gothic", Meiryo, sans-serif;
}
body { min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.site-header {
  display: flex; align-items: baseline; gap: 10px;
  border-bottom: 1px solid var(--border);
  padding: 18px 24px;
}
.site-header .logo {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.site-header .logo .prompt { color: var(--accent); margin-right: 6px; }
.site-header .logo:hover { text-decoration: none; opacity: 0.75; }
.site-header .site-subtitle {
  font-size: 12.5px; color: var(--text-dim);
  padding-left: 10px; border-left: 1px solid var(--border);
}

/* ==========================================================================
   トップページ（カードグリッド）
   ========================================================================== */
.home-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}
.hero { margin-bottom: 48px; }
.hero h1 {
  font-size: 30px; color: var(--text); margin: 0 0 10px; font-weight: 800;
}
.hero .tagline { font-size: 16px; color: var(--text-dim); margin: 0; line-height: 1.7; }

.section-label {
  font-size: 12px; color: var(--text-dim); text-transform: uppercase;
  letter-spacing: 0.08em; margin: 0 0 16px; font-weight: 600;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px;
}
.article-card {
  display: block; background: var(--bg); border: 1px solid var(--border);
  border-radius: 12px; padding: 22px 22px 20px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.article-card:hover {
  border-color: var(--accent-soft-border);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
  text-decoration: none; transform: translateY(-2px);
}
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.card-tags .tag {
  font-size: 11px; font-weight: 600; color: var(--accent-strong);
  background: var(--accent-soft); border: 1px solid var(--accent-soft-border);
  border-radius: 999px; padding: 2px 10px;
}
.article-card h2 {
  font-size: 15.5px; color: var(--text); margin: 0 0 10px; line-height: 1.55; font-weight: 700;
}
.article-card .card-excerpt {
  font-size: 13.5px; color: var(--text-dim); line-height: 1.7; margin: 0;
}

/* ==========================================================================
   記事ページ（読みやすさ優先）
   ========================================================================== */
.article-page {
  max-width: 700px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}
.back-link {
  font-size: 13px; color: var(--text-dim);
  display: inline-block; margin-bottom: 24px;
}
.article-page h1 {
  font-size: 28px; line-height: 1.55; color: var(--text);
  margin: 0 0 14px; font-weight: 800;
}
.article-page .meta {
  font-size: 13px; color: var(--text-dim);
  margin-bottom: 44px; padding-bottom: 24px; border-bottom: 1px solid var(--border);
}

.prose { font-size: 17px; line-height: 2; color: var(--text); }
.prose h2 {
  font-size: 20px; color: var(--text); margin: 48px 0 18px; font-weight: 800;
  padding-left: 12px; border-left: 4px solid var(--accent);
}
.prose p { margin: 0 0 26px; }
.prose ul, .prose ol { margin: 0 0 26px; padding-left: 26px; }
.prose li { margin-bottom: 10px; }
.prose strong { color: var(--text); font-weight: 700; }
.prose code {
  background: var(--accent-soft); color: var(--accent-strong);
  border-radius: 4px; padding: 2px 7px; font-size: 14.5px;
}
.prose pre {
  background: var(--code-bg); border: 1px solid var(--code-border);
  border-radius: 8px; padding: 18px 20px; overflow-x: auto; margin: 0 0 30px;
  font-size: 14px; line-height: 1.7;
}
.prose pre code {
  background: none; padding: 0; color: var(--code-text); font-size: 14px; border-radius: 0;
}
.prose blockquote {
  border-left: 3px solid var(--border); margin: 0 0 26px; padding: 4px 20px;
  color: var(--text-dim); font-size: 15.5px; line-height: 1.85;
}
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 30px; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; }
.prose th { background: var(--bg-soft); color: var(--text-dim); font-weight: 700; }
.prose .callout {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 16px 20px; border-radius: 6px; margin: 0 0 30px; font-size: 15.5px; line-height: 1.85;
}
.prose .callout.point { background: var(--bg-soft); border-left-color: var(--text-dim); }
.prose .experience {
  border: 1px solid var(--border); border-radius: 8px;
  padding: 20px 22px; margin: 0 0 30px; background: var(--bg-soft);
}
.prose .experience-badge {
  display: inline-block; font-size: 11px; font-weight: 700; color: var(--accent-strong);
  background: var(--accent-soft); border: 1px solid var(--accent-soft-border);
  border-radius: 4px; padding: 2px 9px; margin-bottom: 10px;
}
.article-footer-nav {
  margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border); font-size: 14px;
}

.prose details {
  border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 16px; margin: 0 0 26px; background: var(--bg-soft);
}
.prose details[open] { padding-bottom: 16px; }
.prose details summary {
  cursor: pointer; font-weight: 700; color: var(--accent-strong); font-size: 14.5px;
  padding: 4px 0;
}
.prose details p { margin: 12px 0 10px; }
.prose details pre { margin: 0; }

.site-footer {
  text-align: center; padding: 32px 24px; font-size: 12px; color: var(--text-dim);
  border-top: 1px solid var(--border); margin-top: 24px;
}

/* ==========================================================================
   ターミナル演出（404など、たまに登場する専用のダーク配色。
   他の要素とは独立させ、上のライト/ブルーテーマの影響を受けない）
   ========================================================================== */
.terminal-scene {
  min-height: 100vh; padding: 24px;
  background: #0d1117; color: #c9d1d9;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  display: flex; align-items: center; justify-content: center;
}
.window {
  width: 100%; max-width: 640px;
  background: #161b22; border: 1px solid #30363d;
  border-radius: 8px; overflow: hidden;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}
.titlebar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; background: #21262d; border-bottom: 1px solid #30363d;
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }
.titlebar-name { margin-left: 8px; font-size: 12px; color: #8b949e; }
.window .content { padding: 32px 28px 36px; line-height: 1.8; }
.window .prompt { color: #ff7b72; }
.window .path { color: #79c0ff; }
.window h1 { font-size: 22px; margin: 18px 0 6px; color: #fff; letter-spacing: 0.5px; }
.window p { color: #8b949e; font-size: 14px; margin: 0 0 8px; }
.window a { color: #58a6ff; }