:root {
  --text: #1a1a2e;
  --sub: #555;
  --accent: #2563eb;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
  --badge-bg: #e0e7ff;
  --badge-text: #3730a3;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Noto Sans Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e2e8f0;
    --sub: #94a3b8;
    --accent: #60a5fa;
    --border: #334155;
    --code-bg: #1e293b;
    --badge-bg: #312e81;
    --badge-text: #a5b4fc;
  }
  body { background: #0f172a; }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { max-width: 48rem; margin: 0 auto; padding: 0 1.5rem; width: 100%; }

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

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.logo { font-size: 1.2rem; font-weight: 700; color: var(--text); }
.logo:hover { color: var(--accent); text-decoration: none; }
.nav-links { display: flex; gap: 1.25rem; }
.nav-links a { font-size: 0.9rem; color: var(--sub); }
.nav-links a:hover { color: var(--accent); text-decoration: none; }

/* Main */
main { flex: 1; padding: 2rem 0; }
h1 { font-size: 1.75rem; margin-bottom: 1rem; line-height: 1.3; }
h2 { font-size: 1.2rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }

/* Tag cloud */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 2rem; }
.tag {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 0.4rem;
  font-size: 0.85rem;
}
.tag:hover { border-color: var(--accent); text-decoration: none; }

/* Badge */
.badge {
  display: inline-block;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.72rem;
  padding: 0.1rem 0.45rem;
  border-radius: 9999px;
  font-weight: 500;
  vertical-align: middle;
}

/* Entry card */
.card {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.card:last-child { border-bottom: none; }

.date-heading { color: var(--sub); font-weight: 600; }
.sub { color: var(--sub); margin-bottom: 1rem; }

/* Search */
.search-box {
  position: relative;
  margin-bottom: 1.5rem;
}
.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.1rem;
  height: 1.1rem;
  max-width: 1.1rem;
  max-height: 1.1rem;
  color: var(--sub);
  pointer-events: none;
  overflow: hidden;
  flex-shrink: 0;
}
#q {
  width: 100%;
  padding: 0.75rem 0.75rem 0.75rem 2.5rem;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: 0.75rem;
  background: var(--code-bg);
  color: var(--text);
  font-family: var(--font);
  transition: border-color 0.15s;
}
#q:focus { outline: none; border-color: var(--accent); }
#q::placeholder { color: var(--sub); }

/* Single entry */
.entry-header { margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
.meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--sub);
  margin-top: 0.4rem;
}

/* Content */
.entry-content { line-height: 1.8; }
.entry-content p { margin-bottom: 1rem; }
.entry-content ul, .entry-content ol { margin-bottom: 1rem; padding-left: 1.5rem; }
.entry-content li { margin-bottom: 0.3rem; }
.entry-content code {
  font-family: var(--mono);
  background: var(--code-bg);
  padding: 0.1rem 0.3rem;
  border-radius: 0.2rem;
  font-size: 0.88em;
}
.entry-content pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 0.4rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  line-height: 1.6;
}
.entry-content pre code { background: none; padding: 0; }
.entry-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--sub);
}
.entry-content img { max-width: 100%; height: auto; }
.entry-content table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; }
.entry-content th, .entry-content td { padding: 0.4rem 0.6rem; border: 1px solid var(--border); text-align: left; }
.entry-content th { background: var(--code-bg); font-weight: 600; }
.entry-content hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 1.5rem 0; text-align: center; font-size: 0.85rem; color: var(--sub); }

@media (max-width: 640px) {
  .header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  h1 { font-size: 1.4rem; }
}