:root {
  --accent: #0ea5e9;
  --bg-page: #f3f4f6;
  --bg-card: #ffffff;
  --text-main: #111827;
  --text-muted: #6b7280;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: sans-serif; background: var(--bg-page); color: var(--text-main); line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }

header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.9); backdrop-filter: blur(10px); border-bottom: 1px solid #ddd; padding: 12px; }
.header-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
nav { display: flex; gap: 15px; }

.hero { max-width: 1000px; margin: 20px auto; padding: 30px; background: #fff; border-radius: 20px; display: flex; align-items: center; gap: 20px; }
.hero-main { flex: 1; }
.hero-visual { flex: 1; border-radius: 15px; overflow: hidden; background: #000; }
.hero-image { width: 100%; display: block; }

h2, h3 { text-align: center; }
.section-card { max-width: 1000px; margin: 0 auto 20px; background: #fff; border-radius: 20px; padding: 30px; }
.architecture-diagram { display: block; max-width: 500px; width: 100%; margin: 20px auto; border-radius: 10px; }

/* ランチャースタイル */
.action-launcher { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin: 20px 0; }
.action-launcher a {
  min-width: 110px; padding: 12px; background: #fff; border: 1px solid #ddd; border-radius: 15px;
  text-align: center; font-weight: bold; font-size: 14px; box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

footer { background: #111827; color: #fff; padding: 40px; text-align: center; margin-top: 50px; }
.footer-links { display: flex; justify-content: center; gap: 30px; margin-bottom: 20px; }
.footer-copy { font-size: 12px; color: #666; }

@media (max-width: 768px) {
  .hero { flex-direction: column; margin: 10px; }
  .header-inner { flex-direction: column; gap: 10px; }
  .section-card { margin: 10px; }
  .action-launcher a { flex: 1; }
}