:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-muted: #eef1f7;
  --text: #1c2430;
  --muted: #5f6b7a;
  --border: #d8dee8;
  --accent: #2457a6;
  --accent-soft: #e5efff;
  --code-bg: #18202b;
  --code-text: #edf3ff;
  --shadow: 0 8px 24px rgba(25, 39, 61, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic",
    "Noto Sans JP", sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  overflow-wrap: anywhere;
}

a {
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(12px);
}

.site-header-inner,
.container {
  width: min(1100px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 58px;
}

.brand {
  flex: 0 0 auto;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  gap: 12px;
  min-width: 0;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.main-nav a {
  padding: 8px 2px;
  font-size: 0.9rem;
}

main.container {
  padding-block: 28px 56px;
}

.hero,
.card,
.article,
.search-panel {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero,
.card,
.search-panel {
  padding: 20px;
}

.hero {
  margin-bottom: 20px;
}

.article {
  max-width: 860px;
  margin-inline: auto;
  padding: clamp(18px, 4vw, 42px);
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  scroll-margin-top: 78px;
}

h1 {
  margin-top: 0;
  font-size: clamp(1.65rem, 4vw, 2.35rem);
}

h2 {
  margin-top: 2.4em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
}

h3 {
  margin-top: 1.8em;
  font-size: 1.2rem;
}

p,
ul,
ol,
blockquote,
table {
  margin-block: 0.9em;
}

li + li {
  margin-top: 0.25em;
}

blockquote {
  margin-inline: 0;
  padding: 10px 14px;
  border-left: 4px solid var(--accent);
  background: var(--surface-muted);
  color: var(--muted);
}

hr {
  margin-block: 2rem;
  border: 0;
  border-top: 1px solid var(--border);
}

code {
  padding: 0.12em 0.35em;
  border-radius: 5px;
  background: var(--surface-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  margin: 1rem 0;
  padding: 14px;
  overflow-x: auto;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-text);
  -webkit-overflow-scrolling: touch;
}

pre code {
  display: block;
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: 0.84rem;
  line-height: 1.55;
  white-space: pre;
}

.table-wrap,
.mermaid-wrap {
  max-width: 100%;
  margin-block: 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.94rem;
}

th,
td {
  padding: 9px 10px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-muted);
}

.mermaid {
  min-width: 620px;
  padding: 8px;
  text-align: center;
}

.meta,
.muted,
.source-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.label {
  display: inline-block;
  margin: 0 0.25em 0.25em 0;
  padding: 0.15em 0.5em;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
}

.toc {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-muted);
}

.toc ul {
  margin: 0.35em 0;
  padding-left: 1.25em;
}

.toc .toc-level-3 {
  padding-left: 1em;
  font-size: 0.93em;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 16px;
}

.card h2,
.card h3 {
  margin-top: 0;
  border: 0;
}

.card p:last-child {
  margin-bottom: 0;
}

.search-panel {
  margin-bottom: 20px;
}

.search-row {
  display: flex;
  gap: 8px;
}

.search-row input {
  min-width: 0;
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.search-results {
  margin-top: 12px;
}

.search-results[hidden] {
  display: none;
}

.search-result {
  padding: 10px 0;
  border-top: 1px solid var(--border);
}

.search-result a {
  font-weight: 700;
}

.footer {
  padding-block: 18px 36px;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161d;
    --surface: #1a2029;
    --surface-muted: #242d39;
    --text: #eef2f7;
    --muted: #a8b4c4;
    --border: #394555;
    --accent: #8db7ff;
    --accent-soft: #243c61;
    --code-bg: #0b0e13;
    --code-text: #eef3fb;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  }
}

@media (max-width: 600px) {
  :root {
    font-size: 15px;
  }

  .site-header-inner,
  .container {
    width: calc(100% - 24px);
  }

  .site-header-inner {
    display: block;
    padding-block: 9px;
  }

  .main-nav {
    margin-top: 4px;
  }

  main.container {
    padding-block: 16px 36px;
  }

  .hero,
  .card,
  .search-panel {
    padding: 16px;
    border-radius: 12px;
  }

  .article {
    padding: 16px;
    border-radius: 12px;
  }

  .search-row {
    display: block;
  }

  .search-row input {
    width: 100%;
  }
}