:root {
  --paper: #faf9f6;
  --card: #ffffff;
  --ink: #26282e;
  --ink-soft: #6e7280;
  --line: #e7e2d6;
  --indigo: #33598c;
  --indigo-soft: rgba(51, 89, 140, 0.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1d21;
    --card: #24262b;
    --ink: #eceae4;
    --ink-soft: #9a9da6;
    --line: #34363c;
    --indigo: #7fa0cf;
    --indigo-soft: rgba(127, 160, 207, 0.12);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  font-size: 16px;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 96px;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 56px;
}

.logo {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-weight: 600;
  font-size: 19px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}

nav.site a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  margin-left: 20px;
}
nav.site a:hover { color: var(--indigo); }

h1 {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-weight: 600;
  font-size: 28px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

.subtitle {
  color: var(--ink-soft);
  font-size: 14px;
  margin: 0 0 40px;
}

h2 {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 19px;
  font-weight: 600;
  margin: 40px 0 12px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}
h2:first-of-type { border-top: none; padding-top: 0; }

p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 1.4em; }
li { margin-bottom: 6px; }

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 16px 0 24px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { color: var(--ink-soft); font-weight: 600; font-size: 13px; }

.callout {
  background: var(--indigo-soft);
  border-radius: 12px;
  padding: 16px 18px;
  font-size: 14px;
  color: var(--ink);
  margin: 20px 0;
}

.meta {
  color: var(--ink-soft);
  font-size: 13px;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

footer.site {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
footer.site a { color: var(--ink-soft); }

/* アプリ内WebViewで開いた時（?app=1）は、他ページへ遷移できないようにする。
   閉じる操作はアプリ側のネイティブな閉じるボタンに委ねる。 */
html.embedded .logo { pointer-events: none; cursor: default; }
html.embedded nav.site { display: none; }
html.embedded footer.site a { display: none; }

/* --- ランディング固有 --- */
.hero { padding: 24px 0 8px; }
.hero .eyebrow {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 12px;
}
.hero h1 { font-size: 32px; text-wrap: balance; }
.hero p.lede {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 40em;
}

.covers {
  display: flex;
  gap: 10px;
  margin: 36px 0 44px;
}
.cover {
  width: 68px;
  aspect-ratio: 1 / 1.4;
  border-radius: 5px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(0,0,0,.15);
}
.cover::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: rgba(0,0,0,.18);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin: 8px 0 40px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}
.feature h3 {
  font-size: 15px;
  margin: 0 0 6px;
  font-weight: 700;
}
.feature p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }

.cta {
  display: inline-block;
  background: var(--indigo);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  padding: 13px 28px;
  border-radius: 100px;
}