:root {
  --indigo: #4b6bfb;
  --indigo-dark: #3a55d9;
  --ink: #1c2340;
  --muted: #5b6478;
  --bg-top: #eef0fb;
  --bg-bottom: #ffffff;
  --card: rgba(255, 255, 255, 0.82);
  --border: rgba(75, 107, 251, 0.14);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Heebo', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 60%);
  min-height: 100vh;
  line-height: 1.7;
}

.wrap { max-width: 860px; margin: 0 auto; padding: 0 24px; }

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand svg { width: 34px; height: 34px; }
.brand span { font-size: 22px; font-weight: 800; color: var(--indigo); letter-spacing: -0.02em; }

nav.links { display: flex; gap: 18px; }
nav.links a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav.links a:hover { color: var(--indigo); }

.hero { text-align: center; padding: 56px 0 40px; }
.hero .mark { width: 92px; height: 92px; margin: 0 auto 18px; }
.hero h1 { font-size: 44px; font-weight: 800; color: var(--indigo); letter-spacing: -0.02em; }
.hero p.tag { font-size: 24px; font-weight: 600; margin-top: 6px; }
.hero p.sub { color: var(--muted); max-width: 560px; margin: 14px auto 0; font-size: 17px; }

.stores { display: flex; gap: 14px; justify-content: center; margin-top: 30px; flex-wrap: wrap; }
.store-btn {
  display: inline-block;
  background: var(--indigo);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  padding: 13px 26px;
  border-radius: 14px;
  transition: background 0.15s ease;
}
.store-btn:hover { background: var(--indigo-dark); }
.store-btn.alt { background: #fff; color: var(--indigo); border: 1.5px solid var(--indigo); }
.store-btn.alt:hover { background: var(--bg-top); }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; padding: 36px 0 20px; }
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  backdrop-filter: blur(8px);
}
.feature h3 { font-size: 17px; margin-bottom: 6px; }
.feature p { color: var(--muted); font-size: 15px; }

main.doc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  margin: 24px 0 48px;
}
main.doc h1 { font-size: 30px; margin-bottom: 4px; }
main.doc p.updated { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
main.doc h2 { font-size: 20px; margin: 26px 0 8px; }
main.doc p, main.doc li { color: #2a3050; font-size: 16px; }
main.doc ul { padding-right: 22px; margin: 8px 0; }
main.doc a { color: var(--indigo); }

footer.site {
  border-top: 1px solid var(--border);
  padding: 26px 0 40px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}
footer.site a { color: var(--muted); text-decoration: none; margin: 0 10px; }
footer.site a:hover { color: var(--indigo); }
footer.site .copy { margin-top: 10px; }

@media (max-width: 560px) {
  .hero h1 { font-size: 36px; }
  .hero p.tag { font-size: 20px; }
  main.doc { padding: 24px 18px; }
}