:root {
  --green: #2e7d5b;
  --green-d: #205c42;
  --bg: #f7f8f5;
  --text: #1c2520;
  --muted: #5c6b63;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Yu Gothic", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
}

a { color: var(--green-d); }

header.hero {
  background: linear-gradient(160deg, var(--green), var(--green-d));
  color: #fff;
  padding: 64px 20px;
  text-align: center;
}

header.hero .logo {
  width: 104px; height: 104px;
  margin: 0 auto 20px;
}
header.hero .logo img {
  width: 104px; height: 104px;
  border-radius: 24px;
  display: block;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

header.hero h1 { font-size: 30px; margin: 0 0 8px; }
header.hero p { font-size: 17px; opacity: 0.92; margin: 0; }

.container { max-width: 760px; margin: 0 auto; padding: 32px 20px; }

.features { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
@media (max-width: 560px) { .features { grid-template-columns: 1fr; } }

.feature {
  background: var(--card);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}
.feature h3 { margin: 0 0 6px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

.cta { text-align: center; margin: 32px 0; }
.cta a {
  display: inline-block;
  background: var(--green);
  color: #fff;
  text-decoration: none;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 700;
}

h2 { font-size: 22px; margin-top: 36px; border-bottom: 2px solid #e3e8e4; padding-bottom: 6px; }
h3 { font-size: 17px; }

.doc { background: var(--card); }
.doc .container { max-width: 800px; }
.muted { color: var(--muted); font-size: 14px; }

footer {
  text-align: center;
  padding: 32px 20px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid #e3e8e4;
}
footer a { margin: 0 8px; }

.notice {
  background: #fff6e5;
  border: 1px solid #f0d9a8;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
}