:root {
  --navy: #173766;
  --blue: #1f6fe5;
  --teal: #12c8d1;
  --ink: #1b2330;
  --muted: #5b6573;
  --line: #e3e8ef;
  --bg: #f6f8fb;
  --max: 760px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Segoe UI", Meiryo, sans-serif;
  line-height: 1.85;
  font-size: 16px;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px 20px;
  display: flex;
  align-items: center;
}

.site-header a { display: inline-flex; }

.site-header img {
  height: 34px;
  width: auto;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px 64px;
}

h1 {
  font-size: 1.6rem;
  line-height: 1.4;
  margin: 0 0 4px;
  color: var(--navy);
}

.updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 28px;
}

h2 {
  font-size: 1.15rem;
  margin: 34px 0 10px;
  padding-left: 12px;
  border-left: 4px solid var(--teal);
  color: var(--navy);
}

.lang-label {
  display: inline-block;
  margin: 48px 0 4px;
  padding: 2px 12px;
  border-radius: 999px;
  background: var(--navy);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

p { margin: 0 0 14px; }

ul { margin: 0 0 14px; padding-left: 1.3em; }
li { margin: 4px 0; }

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

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}

.nav-links {
  margin-top: 18px;
  font-size: 0.95rem;
}
.nav-links a { margin-right: 16px; }

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 20px 48px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
}

/* landing */
.hero {
  text-align: center;
  padding: 8px 0 8px;
}
.hero p.lead {
  font-size: 1.05rem;
  color: var(--muted);
}
.features {
  list-style: none;
  padding: 0;
  margin: 24px 0;
  display: grid;
  gap: 12px;
}
.features li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
}
.features b { color: var(--navy); }