* { box-sizing: border-box; }
body { margin: 0; background: #ffffff; font-family: "Noto Sans JP", system-ui, sans-serif; color: #10233a; -webkit-font-smoothing: antialiased; line-break: strict; }
a { color: #1b57c8; text-decoration: none; }
a:hover { color: #10233a; text-decoration: underline; }
p { text-wrap: pretty; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.92); backdrop-filter: blur(10px); border-bottom: 1px solid #e6ebf3; }
.site-header > div { max-width: 1120px; margin: 0 auto; padding: 16px 32px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.site-header .brand { display: flex; align-items: baseline; gap: 10px; white-space: nowrap; }
.site-header .brand b { font-weight: 700; font-size: 17px; letter-spacing: 0.02em; color: #10233a; }
.site-header .brand span { font-size: 13px; color: #6b7c93; }
.site-header nav { display: flex; align-items: center; gap: 28px; white-space: nowrap; }
.site-header nav a { font-size: 14px; color: #46586f; }
.site-header nav a.cta { background: #1b57c8; color: #ffffff; font-weight: 500; padding: 11px 20px; border-radius: 6px; }
.site-header nav a.cta:hover { background: #10233a; text-decoration: none; }

.article { max-width: 760px; margin: 0 auto; padding: 64px 32px 80px; }
.eyebrow { margin: 0 0 14px; font-size: 13px; font-weight: 700; color: #1b57c8; letter-spacing: 0.08em; }
h1 { margin: 0 0 18px; font-size: 34px; line-height: 1.5; font-weight: 700; letter-spacing: -0.01em; }
.meta { margin: 0 0 40px; font-size: 13px; color: #7b8a9d; }
.lead { margin: 0 0 40px; padding: 22px 26px; border-left: 4px solid #1b57c8; background: #f4f8fe; border-radius: 0 10px 10px 0; font-size: 16px; line-height: 2; color: #2c3d54; }
h2 { margin: 56px 0 18px; font-size: 24px; line-height: 1.55; font-weight: 700; letter-spacing: -0.01em; padding-bottom: 12px; border-bottom: 2px solid #e6ebf3; }
h3 { margin: 34px 0 10px; font-size: 18px; line-height: 1.6; font-weight: 700; }
.article p { margin: 0 0 20px; font-size: 16px; line-height: 2; color: #2c3d54; }
.article ul, .article ol { margin: 0 0 20px; padding-left: 1.4em; font-size: 16px; line-height: 2; color: #2c3d54; }
.article li { margin: 4px 0; }
.example { margin: 0 0 20px; padding: 16px 20px; border: 1px solid #e6ebf3; border-radius: 10px; background: #fbfcfe; font-size: 15px; line-height: 1.9; color: #46586f; }
.example b { color: #10233a; }
table { width: 100%; border-collapse: collapse; margin: 0 0 24px; font-size: 15px; line-height: 1.7; }
th, td { padding: 12px 14px; border-bottom: 1px solid #e6ebf3; text-align: left; vertical-align: top; }
th { background: #f4f8fe; font-weight: 700; color: #10233a; white-space: nowrap; }
td { color: #2c3d54; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.note { font-size: 13px; color: #7b8a9d; line-height: 1.9; }
.check { margin: 0 0 20px; padding: 0; list-style: none; }
.check li { position: relative; margin: 0 0 14px; padding: 16px 18px 16px 52px; border: 1px solid #e6ebf3; border-radius: 10px; background: #ffffff; font-size: 15px; line-height: 1.9; color: #2c3d54; }
.check li::before { content: "Q"; position: absolute; left: 16px; top: 17px; width: 24px; height: 24px; border-radius: 50%; background: #1b57c8; color: #ffffff; font-size: 12px; font-weight: 700; display: grid; place-items: center; }
.check li b { display: block; color: #10233a; margin-bottom: 4px; }
.cta { margin: 64px 0 0; padding: 36px 32px; border-radius: 16px; background: #10233a; color: #ffffff; text-align: center; }
.cta h2 { margin: 0 0 12px; border: 0; padding: 0; font-size: 24px; color: #ffffff; }
.cta p { margin: 0 0 22px; color: #a9bcd1; font-size: 15px; }
.cta a { display: inline-block; background: #1b57c8; color: #ffffff; font-size: 16px; font-weight: 500; padding: 15px 30px; border-radius: 7px; }
.cta a:hover { background: #ffffff; color: #10233a; text-decoration: none; }
.back { margin: 40px 0 0; font-size: 14px; }

footer { background: #ffffff; border-top: 1px solid #e6ebf3; }
footer > div { max-width: 1120px; margin: 0 auto; padding: 40px 32px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
footer .copy { font-size: 13px; color: #7b8a9d; white-space: nowrap; }
footer nav { display: flex; align-items: center; gap: 24px; }
footer nav a { font-size: 13px; color: #55677e; white-space: nowrap; }

@media (max-width: 767px) {
  .site-header > div { padding: 12px 20px; gap: 12px; }
  .site-header .brand span, .site-header nav a:not(.cta) { display: none; }
  .site-header nav a.cta { padding: 10px 14px; font-size: 13px; }
  .article { padding: 44px 20px 60px; }
  h1 { font-size: 26px; }
  h2 { font-size: 20px; margin-top: 44px; }
  .lead { padding: 18px 18px; font-size: 15px; }
  .article p, .article ul, .article ol { font-size: 15px; line-height: 1.9; }
  table { font-size: 13px; }
  th, td { padding: 10px 8px; }
  .cta { padding: 28px 20px; }
  footer > div { padding: 28px 20px; }
}
.article code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 0.9em; background: #f0f4f9; padding: 2px 6px; border-radius: 4px; }