:root {
  --ink: #1a1d24;
  --muted: #5a6472;
  --line: #e3e7ed;
  --bg: #ffffff;
  --soft: #f5f8f7;
  --accent: #0f766e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* header */
.site-head {
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 18px;
  padding-bottom: 18px;
}
.brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--accent); }
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  margin-left: 22px;
}
.site-nav a:hover { color: var(--ink); }

/* hero */
.hero {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  margin: 0 0 16px;
  font-size: 33px;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.hero p {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 18px;
}

/* sections */
section { padding: 44px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}
h3 { font-size: 17px; margin: 0 0 8px; }
p { margin: 0 0 14px; }
.lede { color: var(--muted); max-width: 680px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 8px;
}
.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: var(--soft);
}
.card p { margin: 0; color: var(--muted); font-size: 15px; }

ul.plain { margin: 0 0 14px; padding-left: 20px; color: var(--muted); }
ul.plain li { margin-bottom: 8px; }

.notice {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  background: var(--soft);
  padding: 20px 22px;
}
.notice p:last-child { margin-bottom: 0; }

/* legal pages */
.legal { padding: 44px 0 0; }
.legal h1 { font-size: 28px; margin: 0 0 8px; letter-spacing: -0.02em; }
.legal .updated { color: var(--muted); font-size: 15px; margin-bottom: 28px; }
.legal h2 { margin-top: 32px; font-size: 19px; }

/* footer */
.site-foot {
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding: 28px 0 44px;
  color: var(--muted);
  font-size: 14px;
}
.foot-nav a { color: var(--muted); text-decoration: none; margin-right: 18px; }
.foot-nav a:hover { color: var(--ink); }
.site-foot p { margin: 14px 0 0; max-width: 720px; }

@media (max-width: 600px) {
  body { font-size: 16px; }
  .hero { padding: 40px 0 32px; }
  .hero h1 { font-size: 27px; }
  .site-nav a { margin-left: 0; margin-right: 18px; }
}