:root {
  --paper: #f6f0e4;
  --card: #fffcf6;
  --ink: #2a2420;
  --ink-soft: #6b5e54;
  --hairline: #e6dccb;
  --accent: #d9472b;
  --link: #b0351c;
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1a1714;
    --card: #27231f;
    --ink: #f3eee6;
    --ink-soft: #b3a89c;
    --hairline: #3a342e;
    --link: #f08a6e;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}

h1, h2, h3, .brand {
  font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.2;
}

a { color: var(--link); text-underline-offset: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.topbar { border-bottom: 1px solid var(--hairline); }
.topbar .inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 17px; white-space: nowrap; color: var(--ink); text-decoration: none; }
.brand img { border-radius: 22.37%; }
.topbar nav { display: flex; gap: 6px; }
.topbar nav a { color: var(--ink); text-decoration: none; font-weight: 600; padding: 10px; border-radius: 10px; }
.topbar nav a:hover { background: var(--hairline); }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px 48px; }

.hero { text-align: center; padding: 44px 0 28px; }
.app-icon { width: 120px; height: 120px; border-radius: 22.37%; box-shadow: 0 8px 24px rgba(74, 42, 19, 0.22); }
.hero h1 { margin: 20px 0 6px; font-size: 40px; font-weight: 800; }
.tagline { margin: 0 auto; max-width: 30em; font-size: 20px; color: var(--ink-soft); }
/* App Store の公式バッジ (Apple の絵のまま。高さは 40px 以上) */
.store-badge { display: inline-block; margin-top: 20px; line-height: 0; }
.store-badge img { height: 50px; width: auto; }

h2 { margin: 40px 0 12px; font-size: 26px; font-weight: 800; }
h3 { margin: 0 0 6px; font-size: 19px; font-weight: 800; }

.cards { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card {
  background: var(--card);
  border: 1.5px solid var(--hairline);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
}
.card p { margin: 0; color: var(--ink-soft); }

.list { padding-left: 1.2em; }
.list li { margin: 8px 0; }

.shots { display: flex; gap: 14px; overflow-x: auto; padding: 4px 0 12px; -webkit-overflow-scrolling: touch; }
.shots img { height: 420px; width: auto; border-radius: 16px; border: 1px solid var(--hairline); flex: none; }

.legal h1 { font-size: 34px; font-weight: 800; margin: 36px 0 4px; }
.legal .eff { margin: 0 0 20px; color: var(--ink-soft); }
.legal h2 { font-size: 22px; margin: 32px 0 8px; }
.legal ul { padding-left: 1.2em; }
.legal li { margin: 6px 0; }
.backlink { display: inline-block; margin-top: 20px; padding: 8px 0; font-weight: 600; text-decoration: none; }

details {
  background: var(--card);
  border: 1.5px solid var(--hairline);
  border-radius: 14px;
  margin: 10px 0;
}
summary { cursor: pointer; padding: 14px 16px; font-weight: 700; min-height: 48px; }
details[open] summary { border-bottom: 1px solid var(--hairline); }
details p { margin: 0; padding: 12px 16px 14px; }

.contact {
  background: var(--card);
  border: 1.5px solid var(--hairline);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 18px 0 8px;
}
.contact p { margin: 4px 0; }

footer { border-top: 1px solid var(--hairline); color: var(--ink-soft); font-size: 14px; }
footer .inner { max-width: 760px; margin: 0 auto; padding: 20px; }
footer a { color: var(--ink-soft); }
footer p { margin: 4px 0; }

/* 特定商取引法に基づく表記: 狭い画面は項目名の下に内容、広い画面は 2 列 */
.legal dl.law { margin: 8px 0 0; border-top: 1px solid var(--hairline); }
.legal dl.law div { padding: 12px 0; border-bottom: 1px solid var(--hairline); }
.legal dl.law dt { font-weight: 700; margin: 0 0 2px; }
.legal dl.law dd { margin: 0; }
@media (min-width: 640px) {
  .legal dl.law div { display: grid; grid-template-columns: 13em 1fr; gap: 16px; }
}