:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f7f8fa;
  --color-text: #1d1d1f;
  --color-text-soft: #6e6e73;
  --color-border: #e5e5ea;
  --color-accent: #007aff;
  --color-accent-soft: #e8f1ff;
  --color-success: #34c759;
  --color-warning: #ff9500;
  --color-danger: #ff3b30;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1c1c1e;
    --color-bg-soft: #2c2c2e;
    --color-text: #f2f2f7;
    --color-text-soft: #98989d;
    --color-border: #38383a;
    --color-accent: #0a84ff;
    --color-accent-soft: #1c3a5e;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

header.site-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

header.site-header h1 {
  font-size: 1.5rem;
  margin: 0 0 4px;
}

header.site-header p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.9rem;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-soft);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--color-text-soft);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--color-accent); }

h1, h2, h3, h4 { line-height: 1.4; }
h1 { font-size: 1.6rem; margin-top: 0; }
h2 { font-size: 1.25rem; margin-top: 32px; padding-bottom: 6px; border-bottom: 1px solid var(--color-border); }
h3 { font-size: 1.05rem; margin-top: 24px; }

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.card {
  display: block;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  text-decoration: none;
  color: var(--color-text);
  transition: transform .12s ease, box-shadow .12s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.card .title { font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.card .desc { font-size: 0.85rem; color: var(--color-text-soft); }
.card .meta { font-size: 0.75rem; color: var(--color-text-soft); margin-top: 8px; }

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.72rem;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  margin-right: 4px;
}

.tag.warn { background: rgba(255,149,0,0.15); color: var(--color-warning); }
.tag.done { background: rgba(52,199,89,0.15); color: var(--color-success); }
.tag.todo { background: var(--color-bg-soft); color: var(--color-text-soft); border: 1px solid var(--color-border); }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}

@media (min-width: 600px) {
  table { display: table; white-space: normal; }
}

th, td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  text-align: left;
  font-size: 0.9rem;
}

th { background: var(--color-bg-soft); font-weight: 600; }

pre {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

code {
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  background: var(--color-bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}

pre code { background: none; padding: 0; }

img, svg { max-width: 100%; height: auto; }

.callout {
  border-left: 3px solid var(--color-accent);
  background: var(--color-accent-soft);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  font-size: 0.92rem;
}

.callout.warn { border-color: var(--color-warning); background: rgba(255,149,0,0.08); }
.callout.danger { border-color: var(--color-danger); background: rgba(255,59,48,0.08); }

.history-table { font-size: 0.85rem; }
.history-table th { background: var(--color-bg-soft); }
.history-table td:first-child { white-space: nowrap; font-weight: 600; }

.section-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0 16px;
  font-size: 0.8rem;
  color: var(--color-text-soft);
}

.kv-list { list-style: none; padding-left: 0; }
.kv-list li { display: flex; gap: 12px; padding: 6px 0; border-bottom: 1px dashed var(--color-border); }
.kv-list li .k { flex: 0 0 140px; color: var(--color-text-soft); font-size: 0.88rem; }
.kv-list li .v { flex: 1; }

.checklist { list-style: none; padding-left: 0; }
.checklist li { position: relative; padding-left: 28px; margin: 6px 0; }
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 6px;
  width: 18px; height: 18px;
  border: 1.5px solid var(--color-border);
  border-radius: 4px;
}
.checklist li.done::before {
  background: var(--color-success);
  border-color: var(--color-success);
}
.checklist li.done::after {
  content: "✓";
  position: absolute;
  left: 4px; top: 4px;
  color: white;
  font-size: 0.85rem;
  font-weight: bold;
}

footer.site-footer {
  margin-top: 64px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-soft);
  font-size: 0.8rem;
  text-align: center;
}