:root {
  --bg: #0b0f14;
  --card: #0f1621;
  --text: #e8edf3;
  --muted: #9fb0c0;
  --line: rgba(255, 255, 255, 0.08);
  --link: #7ad1ff;
  --accent: #ffd166;
  --max: 860px;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  font-family: "BIZ UDPGothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, -apple-system, "Segoe UI", sans-serif;
  background: radial-gradient(1000px 600px at 20% 10%, rgba(122, 209, 255, 0.18), transparent 50%),
              radial-gradient(800px 500px at 70% 20%, rgba(255, 209, 102, 0.14), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.8;
}

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

.container { max-width: var(--max); margin: 0 auto; padding: 24px 16px; }
.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(11, 15, 20, 0.6);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: inline-flex; gap: 10px; align-items: center; font-weight: 700; letter-spacing: 0.2px; }
.dot { width: 10px; height: 10px; border-radius: 999px; background: var(--accent); box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.16); }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
}

h1 { font-size: 30px; line-height: 1.35; margin: 0 0 10px; }
h2 { margin-top: 34px; padding-top: 12px; border-top: 1px solid var(--line); }
h3 { margin-top: 26px; }
p { margin: 12px 0; }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
code { font-family: ui-monospace, "Cascadia Mono", "SFMono-Regular", Menlo, Consolas, monospace; font-size: 0.95em; }
pre {
  overflow: auto;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.25);
}
blockquote {
  margin: 18px 0;
  padding: 10px 14px;
  border-left: 4px solid rgba(122, 209, 255, 0.5);
  background: rgba(122, 209, 255, 0.08);
  border-radius: 10px;
}

.meta { color: var(--muted); font-size: 14px; }
.toc {
  margin: 18px 0 22px;
  padding: 14px 16px;
  border: 1px dashed rgba(255,255,255,0.15);
  border-radius: 14px;
}
.toc strong { display: block; margin-bottom: 6px; color: var(--text); }
.toc a { color: var(--text); opacity: 0.9; }
.toc a:hover { opacity: 1; }

.posts { list-style: none; padding: 0; margin: 0; }
.posts li { padding: 14px 0; border-top: 1px solid var(--line); }
.posts li:first-child { border-top: none; }
.posts .t { font-weight: 700; }
.posts .d { color: var(--muted); font-size: 14px; margin-top: 4px; }

.footer { color: var(--muted); font-size: 13px; margin-top: 18px; }

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}
.breadcrumb li::after { content: '>'; margin: 0 6px; opacity: 0.5; }
.breadcrumb li:last-child::after { content: ''; margin: 0; }
.breadcrumb li:last-child { color: var(--text); }

.hero { text-align: center; padding: 32px 0 24px; }
.hero h1 { font-size: 36px; margin-bottom: 8px; }
.hero-sub { color: var(--muted); font-size: 16px; margin: 0; }

.section-title {
  font-size: 20px;
  margin: 28px 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.categories { margin: 20px 0; }
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.cat-card {
  background: linear-gradient(135deg, rgba(122,209,255,0.08), rgba(255,209,102,0.06));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
  transition: transform 0.15s, box-shadow 0.15s;
}
.cat-card:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.2); }
.cat-card a { text-decoration: none; color: var(--text); }
.cat-card h2 { font-size: 17px; margin: 0; }

.recent { margin: 20px 0; }