:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #6b6b70;
  --line: #e4e2dc;
  --accent: #4b3a8c;
  --accent-soft: #ece8f7;
  --radius: 16px;
  --max: 1040px;
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --surface: #1d1d20;
    --text: #f2f2f4;
    --muted: #a0a0a8;
    --line: #2e2e33;
    --accent: #b6a6f2;
    --accent-soft: #2a2540;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
img { max-width: 100%; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* header / footer */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}
.logo {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--text);
  text-decoration: none;
}
.nav { display: flex; gap: 20px; font-size: 14px; }
.nav a { color: var(--muted); text-decoration: none; white-space: nowrap; }
.nav a:hover { color: var(--text); }

.site-footer {
  margin-top: 96px;
  border-top: 1px solid var(--line);
  padding: 32px 0 48px;
  font-size: 13px;
  color: var(--muted);
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-footer a { color: var(--muted); }

/* hero */
.hero { padding: 96px 0 72px; }
.hero h1 {
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.25;
  margin: 0 0 20px;
  letter-spacing: .02em;
}
.hero p { color: var(--muted); font-size: 17px; max-width: 640px; margin: 0; }

section { padding: 40px 0; }
h2 { font-size: 24px; margin: 0 0 24px; }

/* app grid */
.apps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(290px, 100%), 1fr));
  gap: 16px;
}
.app-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.app-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.app-card > div { min-width: 0; }
.app-card h3 { margin: 0 0 4px; font-size: 16px; line-height: 1.4; }
.app-card p { margin: 0; font-size: 13px; color: var(--muted); line-height: 1.6; }

.icon {
  flex: none;
  width: 64px;
  height: 64px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 30px;
  background: var(--accent-soft);
}
.icon.lg { width: 96px; height: 96px; border-radius: 22px; font-size: 46px; }

.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}

/* app page */
.app-hero { display: flex; gap: 24px; align-items: center; padding: 64px 0 32px; flex-wrap: wrap; }
.app-hero h1 { margin: 0 0 6px; font-size: clamp(24px, 4vw, 34px); line-height: 1.3; }
.app-hero p { margin: 0; color: var(--muted); }

.stores { display: flex; flex-wrap: wrap; gap: 12px; margin: 8px 0 0; }
.store {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}
.store.soon { background: transparent; color: var(--muted); border: 1px dashed var(--line); font-weight: 400; }

.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr)); gap: 16px; }
.feature {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.feature h3 { margin: 0 0 6px; font-size: 15px; }
.feature p { margin: 0; font-size: 14px; color: var(--muted); }

.links { display: flex; flex-wrap: wrap; gap: 16px; font-size: 14px; }

/* document pages (privacy policy etc.) */
.doc {
  max-width: 760px;
  margin: 48px auto 0;
  padding: 40px clamp(20px, 5vw, 48px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.doc h1 { font-size: 26px; margin: 0 0 4px; line-height: 1.4; }
.doc .meta { color: var(--muted); font-size: 13px; margin: 0 0 32px; }
.doc h2 { font-size: 17px; margin: 36px 0 10px; padding-top: 8px; border-top: 1px solid var(--line); }
.doc h3 { font-size: 15px; margin: 20px 0 6px; }
.doc p, .doc li { font-size: 15px; }
.doc ul { padding-left: 1.4em; }
.doc table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 12px 0; }
.doc th, .doc td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.doc th { background: var(--bg); }

.breadcrumb { font-size: 13px; color: var(--muted); margin: 24px 0 0; }
.breadcrumb a { color: var(--muted); }

@media (max-width: 560px) {
  .nav { gap: 12px; font-size: 13px; }
  .nav a[href="/#about"] { display: none; }
  .logo { font-size: 18px; }
  .hero { padding: 64px 0 48px; }
}

/* images */
.logo { display: inline-flex; align-items: center; gap: 10px; }
.logo img { width: 32px; height: 32px; border-radius: 8px; }
img.icon { object-fit: cover; background: none; border: 1px solid var(--line); }
.hero-logo { width: 160px; height: 160px; border-radius: 36px; margin: 0 0 28px; box-shadow: 0 12px 40px rgba(24, 20, 60, .25); }

@media (max-width: 340px) {
  .logo { font-size: 0; }
}

/* guide pages */
.doc ol { padding-left: 1.4em; }
.doc dt { font-weight: 700; margin-top: 12px; }
.doc dd { margin: 0 0 0 1em; font-size: 15px; color: var(--muted); }
.doc .toc { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 14px; }
.doc.guide { max-width: 880px; }
.guide-step { display: grid; grid-template-columns: 200px 1fr; gap: 28px; align-items: start; }
.guide-step h3:first-child { margin-top: 0; }
.guide-step .shots { display: grid; gap: 16px; }
.guide-step .shots img { width: 100%; height: auto; border-radius: 20px; border: 1px solid var(--line); }
.doc details { border: 1px solid var(--line); border-radius: 12px; padding: 0 16px; margin: 8px 0; }
.doc summary { cursor: pointer; font-weight: 600; font-size: 15px; padding: 10px 0; }
.doc details p { margin: 0 0 12px; }
@media (max-width: 640px) {
  .guide-step { grid-template-columns: 1fr; }
  .guide-step .shots { grid-template-columns: repeat(2, minmax(0, 160px)); justify-content: center; }
}