:root {
  --c-blue-50: #EFF6FF;
  --c-blue-100: #DBEAFE;
  --c-blue-200: #BFDBFE;
  --c-blue-300: #93C5FD;
  --c-blue-500: #3B82F6;
  --c-blue-600: #2563EB;
  --c-blue-700: #1D4ED8;
  --c-blue-800: #1E40AF;
  --c-blue-900: #172554;
  --c-ink: #1E293B;
  --c-ink-strong: #0F172A;
  --c-muted: #475569;
  --c-line: #E2E8F0;
  --c-bg: #FFFFFF;
  --c-bg-alt: #F8FAFC;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .08);
  --maxw: 1120px;
  --font: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "YuGothic", "Meiryo", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-ink);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

img, svg { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 { color: var(--c-ink-strong); line-height: 1.35; margin: 0 0 .6em; font-weight: 800; letter-spacing: .01em; }
h1 { font-size: clamp(1.7rem, 1.2rem + 2.2vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 1.1rem + 1.2vw, 1.9rem); margin-top: 1.8em; }
h3 { font-size: clamp(1.12rem, 1rem + .5vw, 1.35rem); margin-top: 1.4em; }
p { margin: 0 0 1.1em; }

a { color: var(--c-blue-700); text-underline-offset: .18em; text-decoration-thickness: .09em; }
a:hover { color: var(--c-blue-800); }

:focus-visible { outline: 3px solid var(--c-blue-700); outline-offset: 2px; border-radius: 3px; }

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--c-blue-700);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  z-index: 100;
  transition: top .15s ease;
}
.skip-link:focus { top: 12px; color: #fff; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(16px, 4vw, 28px); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--c-line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 68px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; padding: 6px 4px; }
.brand-mark { width: 40px; height: 40px; }
.brand-name { font-weight: 900; font-size: 1.22rem; letter-spacing: .06em; color: var(--c-blue-800); }
.site-nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--c-ink);
  text-decoration: none;
  font-weight: 700;
  font-size: .98rem;
}
.site-nav a:hover { background: var(--c-blue-50); color: var(--c-blue-800); }

main { display: block; }

.section { padding-block: clamp(40px, 6vw, 72px); }
.section-alt { background: var(--c-bg-alt); border-block: 1px solid var(--c-line); }
.section-head { max-width: 720px; margin: 0 auto clamp(28px, 4vw, 44px); text-align: center; }
.section-head p { color: var(--c-muted); font-size: 1.05rem; margin: 0; }
.eyebrow { display: inline-block; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; font-size: .74rem; color: var(--c-blue-700); background: var(--c-blue-50); padding: 6px 12px; border-radius: 999px; margin-bottom: 14px; }

.hero { background: linear-gradient(180deg, var(--c-blue-50), #fff 78%); border-bottom: 1px solid var(--c-line); }
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(24px, 5vw, 56px); align-items: center; padding-block: clamp(44px, 7vw, 92px); }
.hero h1 { margin-bottom: .5em; }
.hero-lead { font-size: clamp(1.05rem, 1rem + .5vw, 1.28rem); color: var(--c-muted); margin-bottom: 1.6em; }
.hero-art { display: grid; place-items: center; }
.hero-art .disc { width: min(360px, 78vw); aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 50% 44%, #fff, var(--c-blue-100)); box-shadow: var(--shadow); display: grid; place-items: center; }
.hero-art img { width: 66%; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 12px 24px; border-radius: 999px; font-weight: 800; text-decoration: none; border: 2px solid transparent; cursor: pointer; font-size: 1rem; }
.btn-primary { background: var(--c-blue-700); color: #fff; }
.btn-primary:hover { background: var(--c-blue-800); color: #fff; }
.btn-ghost { background: #fff; color: var(--c-blue-800); border-color: var(--c-blue-200); }
.btn-ghost:hover { background: var(--c-blue-50); color: var(--c-blue-900); }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

.grid { display: grid; gap: 22px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-sm); height: 100%; }
.feature .ficon { width: 52px; height: 52px; border-radius: 14px; background: var(--c-blue-50); color: var(--c-blue-700); display: grid; place-items: center; margin-bottom: 16px; }
.feature .ficon svg { width: 28px; height: 28px; }
.feature h3 { margin: 0 0 .4em; font-size: 1.16rem; }
.feature p { margin: 0; color: var(--c-muted); font-size: .98rem; }

.article-card { display: flex; flex-direction: column; gap: 12px; text-decoration: none; color: inherit; transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease; }
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-blue-200); }
.article-card .tag { align-self: flex-start; font-size: .74rem; font-weight: 800; letter-spacing: .08em; color: var(--c-blue-700); background: var(--c-blue-50); padding: 5px 11px; border-radius: 999px; }
.article-card h3 { margin: 0; font-size: 1.2rem; color: var(--c-ink-strong); }
.article-card p { margin: 0; color: var(--c-muted); font-size: .96rem; }
.article-card .more { margin-top: auto; font-weight: 800; color: var(--c-blue-700); }

.prose { max-width: 760px; margin-inline: auto; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.prose li { margin-bottom: .5em; }
.prose h2 { padding-top: .2em; }
.prose strong { color: var(--c-ink-strong); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--c-blue-50); color: var(--c-blue-900); padding: .12em .4em; border-radius: 6px; font-size: .92em; overflow-wrap: anywhere; }
.codeblock { display: block; background: var(--c-blue-50); border: 1px solid var(--c-blue-200); border-radius: var(--radius-sm); padding: 14px 16px; overflow-wrap: anywhere; word-break: break-all; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92rem; color: var(--c-blue-900); margin: 0 0 1.2em; line-height: 1.6; }

.lede { font-size: 1.12rem; color: var(--c-muted); }

.summary-card { background: var(--c-blue-50); border: 1px solid var(--c-blue-200); border-left: 6px solid var(--c-blue-700); border-radius: var(--radius); padding: 22px 24px; margin: 0 0 30px; }
.summary-card h2 { margin: 0 0 .5em; font-size: 1.15rem; color: var(--c-blue-900); display: flex; align-items: center; gap: 10px; }
.summary-card p:last-child, .summary-card ul:last-child { margin-bottom: 0; }

.note { background: var(--c-bg-alt); border: 1px solid var(--c-line); border-radius: var(--radius-sm); padding: 18px 20px; margin: 24px 0; }
.note strong { color: var(--c-ink-strong); }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0 0 1.4em; }
.steps > li { counter-increment: step; position: relative; padding: 4px 0 18px 52px; }
.steps > li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 36px; height: 36px; border-radius: 50%; background: var(--c-blue-700); color: #fff; font-weight: 800; display: grid; place-items: center; }
.steps > li:not(:last-child)::after { content: ""; position: absolute; left: 17px; top: 40px; bottom: 4px; width: 2px; background: var(--c-blue-200); }
.steps h3 { margin: .2em 0 .3em; font-size: 1.08rem; }
.steps p { margin: 0; color: var(--c-muted); }

.table-wrap { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--c-line); border-radius: var(--radius-sm); }
table { width: 100%; border-collapse: collapse; min-width: 460px; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--c-line); vertical-align: top; }
th { background: var(--c-bg-alt); font-weight: 800; color: var(--c-ink-strong); }
tr:last-child td { border-bottom: 0; }

details.faq { border: 1px solid var(--c-line); border-radius: var(--radius-sm); padding: 4px 20px; margin-bottom: 12px; background: #fff; }
details.faq + details.faq { margin-top: 0; }
details.faq summary { cursor: pointer; font-weight: 800; color: var(--c-ink-strong); padding: 14px 0; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 14px; min-height: 24px; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "＋"; color: var(--c-blue-700); font-weight: 800; }
details.faq[open] summary::after { content: "－"; }
details.faq .faq-body { padding: 0 0 16px; color: var(--c-ink); }
details.faq .faq-body p:last-child { margin-bottom: 0; }

.breadcrumb { font-size: .88rem; color: var(--c-muted); padding-block: 18px; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.breadcrumb li { display: flex; gap: 8px; align-items: center; }
.breadcrumb li + li::before { content: "/"; color: var(--c-blue-300); }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb [aria-current="page"] { color: var(--c-ink); }

.page-head { background: linear-gradient(180deg, var(--c-blue-50), #fff); border-bottom: 1px solid var(--c-line); }
.page-head .container { padding-block: clamp(28px, 4vw, 48px); }
.page-head h1 { margin-bottom: .3em; }
.page-head .lede { max-width: 720px; margin: 0; }

.article-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; color: var(--c-muted); font-size: .92rem; margin: 6px 0 0; }
.article-meta span { display: inline-flex; align-items: center; gap: 7px; }

.related { border-top: 1px solid var(--c-line); margin-top: 40px; padding-top: 30px; }
.related h2 { margin-top: 0; }

.cta-band { background: linear-gradient(120deg, var(--c-blue-700), var(--c-blue-900)); color: #fff; border-radius: var(--radius); padding: clamp(28px, 5vw, 48px); text-align: center; }
.cta-band h2 { color: #fff; margin-top: 0; }
.cta-band p { color: var(--c-blue-100); max-width: 640px; margin-inline: auto; }

.site-footer { background: var(--c-blue-900); color: #E2E8F0; margin-top: 40px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; padding-block: clamp(40px, 5vw, 56px); }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { color: #C7D2FE; font-size: .95rem; max-width: 34ch; }
.footer-col h3 { color: #fff; font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; margin: 0 0 14px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.footer-col a { color: #C7D2FE; text-decoration: none; display: inline-flex; align-items: center; min-height: 40px; }
.footer-col a:hover { color: #fff; text-decoration: underline; }
.footer-social { display: flex; gap: 12px; margin-top: 8px; }
.footer-social a { width: 44px; height: 44px; border-radius: 12px; background: rgba(255,255,255,.08); display: grid; place-items: center; color: #DBEAFE; }
.footer-social a:hover { background: rgba(255,255,255,.16); color: #fff; }
.footer-social svg { width: 20px; height: 20px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-block: 22px; display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; align-items: center; font-size: .86rem; color: #A9B6D9; }
.footer-bottom p { margin: 0; }
.footer-bottom a { color: #C7D2FE; }
.site-footer :focus-visible { outline-color: #fff; }

.center { text-align: center; }
.mt-0 { margin-top: 0; }
.items-center { align-items: center; }
.disc-sm { width: min(260px, 60vw) !important; }
.cta-band .btn-row { justify-content: center; margin-top: 22px; }
.btn-row.center { justify-content: center; }
.contact-methods { display: grid; gap: 16px; max-width: 640px; }
.contact-methods .card { display: flex; gap: 16px; align-items: flex-start; }
.contact-methods .ci { width: 46px; height: 46px; border-radius: 12px; background: var(--c-blue-50); color: var(--c-blue-700); display: grid; place-items: center; flex: none; }
.contact-methods .ci svg { width: 24px; height: 24px; }
.contact-methods h3 { margin: 0 0 .2em; font-size: 1.05rem; }
.contact-methods p { margin: 0; color: var(--c-muted); font-size: .96rem; }

.legal .prose h2 { margin-top: 1.6em; }
.legal .prose { max-width: 820px; }
.legal address { font-style: normal; color: var(--c-ink); }

@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero .btn-row { justify-content: center; }
  .hero-art { order: -1; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .header-inner { min-height: 60px; }
  .brand-name { font-size: 1.08rem; }
  .site-nav a { padding: 6px 10px; font-size: .92rem; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { justify-content: flex-start; }
}