:root {
  --bg: #ffffff;
  --bg-muted: #f5f6f8;
  --fg: #1f2328;
  --fg-muted: #59636e;
  --border: #d8dee4;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --code-bg: #eff1f3;
  --radius: 10px;
  --width: 960px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-muted: #161b22;
    --fg: #e6edf3;
    --fg-muted: #9198a1;
    --border: #30363d;
    --accent: #4493f8;
    --code-bg: #1f242c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family:
    system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.8;
}

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

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

code,
kbd,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

code,
kbd {
  background: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

kbd {
  border: 1px solid var(--border);
  border-bottom-width: 2px;
}

pre {
  background: var(--code-bg);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  line-height: 1.6;
}

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

.container {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 16px;
}

/* ヘッダーとフッター */
.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
}

.site-title {
  color: var(--fg);
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 20px;
}

.site-nav a {
  color: var(--fg-muted);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--fg);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 0.9em;
  margin-top: 64px;
  padding: 24px 0;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

/* ページの見出し */
.hero {
  padding: 56px 0 32px;
}

.hero h1 {
  font-size: 2.4rem;
  line-height: 1.3;
  margin: 0 0 12px;
}

.hero .lead {
  color: var(--fg-muted);
  font-size: 1.15rem;
  margin: 0 0 24px;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 8px;
  padding: 10px 20px;
  font-weight: 600;
  text-decoration: none;
}

.button.secondary {
  background: var(--bg-muted);
  color: var(--fg);
  border: 1px solid var(--border);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 本文 */
main h2 {
  font-size: 1.6rem;
  margin: 56px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

main h3 {
  font-size: 1.2rem;
  margin: 32px 0 8px;
}

.screenshot {
  margin: 24px 0;
}

.screenshot img {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgb(0 0 0 / 0.08);
}

.screenshot figcaption {
  color: var(--fg-muted);
  font-size: 0.9em;
  margin-top: 8px;
  text-align: center;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  padding: 0;
  list-style: none;
}

.features li {
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.features strong {
  display: block;
  margin-bottom: 4px;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}

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

.note {
  background: var(--bg-muted);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  padding: 12px 16px;
}

/* トップページの拡張機能一覧 */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card img {
  display: block;
  border-bottom: 1px solid var(--border);
}

.card-body {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.card h2 {
  border: none;
  margin: 0;
  padding: 0;
}

.card p {
  margin: 0;
  color: var(--fg-muted);
  flex: 1;
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.9rem;
  }

  .site-nav {
    gap: 12px;
  }
}