:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #17181a;
  --muted: #666b73;
  --line: #e7e9ee;
  --accent: #111827;
  --soft: #f1f3f7;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
               "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}
a { color: #2457d6; text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 920px; margin: 0 auto; padding: 24px 18px 64px; }
.header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 10px 0 22px;
}
.brand { font-weight: 800; font-size: 20px; letter-spacing: .01em; color: var(--text); }
.nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.hero, .card {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 28px; box-shadow: 0 6px 24px rgba(0,0,0,.035);
}
.hero h1 { margin: 0 0 8px; font-size: clamp(28px, 6vw, 42px); line-height: 1.2; }
.hero p { margin: 0; color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; margin-top: 16px; }
.card h2, .card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.langbar {
  display: flex; gap: 10px; margin: 18px 0;
  flex-wrap: wrap;
}
.langbar a {
  background: var(--soft); border-radius: 999px; padding: 7px 12px;
  color: var(--text); font-size: 14px;
}
.section { margin-top: 18px; }
.section h2 {
  font-size: 22px; margin: 34px 0 10px; padding-bottom: 8px; border-bottom: 1px solid var(--line);
}
.section h3 { font-size: 17px; margin: 24px 0 6px; }
.meta { color: var(--muted); font-size: 14px; }
.note {
  background: #fff8e7; border: 1px solid #f2d58c; border-radius: 12px;
  padding: 14px 16px;
}
ul { padding-left: 22px; }
.footer { color: var(--muted); font-size: 13px; margin-top: 28px; text-align: center; }
@media (max-width: 700px) {
  .grid { grid-template-columns: 1fr; }
  .hero, .card { padding: 21px; border-radius: 14px; }
  .header { align-items: flex-start; flex-direction: column; }
}