:root {
  --text: #171717;
  --muted: #525252;
  --border: #e5e5e5;
  --surface: #f7f7f8;
  --accent: #1a73e8;
  --green: #0f766e;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Hiragino Sans', Meiryo, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.6;
}
a { color: inherit; }
.top {
  padding: 28px 20px 54px;
  border-bottom: 1px solid var(--border);
}
.nav,
.wrap,
.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
}
.nav {
  margin-bottom: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 900;
  font-size: 18px;
}
.login,
.primary,
.secondary {
  min-height: 40px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
}
.login {
  padding: 8px 16px;
  background: var(--text);
  color: #fff;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 34px;
  align-items: center;
}
h1 {
  font-size: 44px;
  line-height: 1.16;
  font-weight: 900;
  margin: 0 0 18px;
  max-width: 640px;
}
.lead {
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 620px;
  margin: 0 0 28px;
}
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.primary {
  min-height: 46px;
  padding: 11px 20px;
  background: var(--accent);
  color: #fff;
}
.secondary {
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid #d4d4d4;
  background: #fff;
}
.hero img {
  width: 100%;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.10);
}
.section {
  padding: 56px 20px;
}
.band {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.two {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 28px;
  align-items: start;
}
.eyebrow {
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  margin: 0 0 10px;
}
h2 {
  font-size: 30px;
  line-height: 1.3;
  font-weight: 900;
  margin: 0 0 14px;
}
.section-lead {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
  margin: 0;
}
.stack {
  display: grid;
  gap: 12px;
}
.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  background: #fff;
}
.card h3 {
  font-size: 18px;
  line-height: 1.35;
  font-weight: 900;
  margin: 0 0 6px;
}
.card p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
}
.label {
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  margin-bottom: 6px;
}
.app-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.app-card {
  min-height: 190px;
}
.mark {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
}
.app-card h3 {
  margin-top: 14px;
  font-size: 17px;
}
.accent { font-size: 12px; font-weight: 800; margin-top: 10px !important; }
.footer {
  padding: 30px 20px;
  border-top: 1px solid var(--border);
  color: #737373;
  font-size: 12px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.footer a { color: #525252; text-decoration: none; }
.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  font-size: 14px;
  line-height: 1.8;
}
.doc h1 { font-size: 24px; margin-bottom: 8px; }
.doc h2 { font-size: 16px; margin-top: 32px; margin-bottom: 8px; }
.updated { font-size: 12px; color: #999; margin-bottom: 32px; }
.doc li { margin-bottom: 6px; }

@media (max-width: 900px) {
  .hero,
  .two {
    grid-template-columns: 1fr;
  }
  .app-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 560px) {
  h1 { font-size: 34px; }
  .app-grid { grid-template-columns: 1fr; }
}