:root {
  color-scheme: light;
  --brand: #2c7de5;
  --brand-dark: #185faf;
  --ink: #172033;
  --muted: #59657a;
  --line: #dbe3ef;
  --soft: #f4f8fd;
  --paper: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--soft);
  color: var(--ink);
  font: 16px/1.68 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.topbar, main, footer {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: var(--brand);
  font-size: 21px;
  font-weight: 720;
  letter-spacing: -.025em;
  text-decoration: none;
}

nav { display: flex; flex-wrap: wrap; gap: 16px; }
nav a, footer a { color: var(--brand-dark); }

main {
  margin-top: 40px;
  margin-bottom: 40px;
  padding: clamp(28px, 6vw, 58px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 55px rgba(24, 62, 103, .08);
}

h1, h2 { color: var(--ink); line-height: 1.2; letter-spacing: -.025em; }
h1 { margin: 0 0 10px; font-size: clamp(32px, 6vw, 48px); }
h2 { margin: 38px 0 10px; font-size: 23px; }
p, li { color: var(--muted); }
li + li { margin-top: 8px; }
.lead { font-size: 18px; }
.meta { color: #788499; font-size: 14px; }
.notice {
  margin: 28px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--brand);
  border-radius: 8px;
  background: #eef5ff;
}
.notice p { margin: 0; color: #314b70; }
.button {
  display: inline-block;
  margin-top: 8px;
  padding: 11px 16px;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  font-weight: 650;
  text-decoration: none;
}

.table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 11px; }
.retention-table { width: 100%; min-width: 650px; border-collapse: collapse; background: #fff; font-size: 14px; }
.retention-table th, .retention-table td { padding: 13px 14px; border-bottom: 1px solid var(--line); vertical-align: top; text-align: left; }
.retention-table th { color: #314a73; background: #f5f8fe; font-size: 12px; letter-spacing: .01em; }
.retention-table td { color: var(--muted); line-height: 1.48; }
.retention-table tr:last-child td { border-bottom: 0; }

footer { padding: 0 0 44px; color: #788499; font-size: 14px; }

@media (max-width: 680px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  main { width: min(100% - 24px, 880px); margin-top: 18px; padding: 24px 20px; }
}