:root {
  --action: #0066cc;
  --brand: #2a9d8f;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --line: #e5e5ea;
  --radius: 18px;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--action); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 20px;
  padding-bottom: 20px;
}
.site-header .logo {
  width: 40px; height: 40px;
  border-radius: 10px;
  flex: none;
}
.site-header .title { font-size: 19px; font-weight: 600; }
.site-header nav { margin-left: auto; display: flex; gap: 20px; font-size: 15px; }

/* Hero */
.hero { background: var(--bg-soft); padding: 56px 0; }
.hero h1 { font-size: 34px; font-weight: 700; letter-spacing: -0.02em; line-height: 1.25; }
.hero p { margin-top: 14px; color: var(--muted); font-size: 18px; }

/* Content */
main { padding: 48px 0 72px; }
main h2 { font-size: 23px; font-weight: 600; margin: 40px 0 14px; letter-spacing: -0.01em; }
main h2:first-child { margin-top: 0; }
main h3 { font-size: 18px; font-weight: 600; margin: 26px 0 8px; }
main p { margin: 12px 0; }
main ul { margin: 12px 0 12px 22px; }
main li { margin: 6px 0; }

.updated { color: var(--muted); font-size: 14px; margin-bottom: 8px; }

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 18px 0;
  background: var(--bg);
}

.notice {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 18px 22px;
  color: var(--muted);
  font-size: 15px;
  margin: 24px 0;
}

.btn {
  display: inline-block;
  background: var(--action);
  color: #fff;
  padding: 12px 26px;
  border-radius: 980px;
  font-weight: 500;
  margin-top: 8px;
}
.btn:hover { text-decoration: none; opacity: 0.9; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  font-size: 14px;
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
.site-footer nav { display: flex; gap: 18px; }

@media (max-width: 520px) {
  .hero h1 { font-size: 27px; }
  .site-header nav { gap: 14px; font-size: 14px; }
}