*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #F3F6FB;
  --paper: #FFFFFF;
  --ink: #1B2433;
  --muted: #5C6B80;
  --line: #D9E2F0;
  --blue: #4C6FFF;
  --peach: #FFE3C4;
  --mint: #C7F0DD;
  --lilac: #E4EAFF;
}
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: "Plus Jakarta Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(243, 246, 251, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.site-header nav {
  max-width: 1120px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px; padding: 14px 40px;
}
.logo { height: 40px; display: block; }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: 0.92rem; font-weight: 500; }
.nav-links a:hover,
.nav-links a[aria-current="page"],
.nav-links a[aria-current="true"] { color: var(--ink); }
.nav-end { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.has-sub { position: relative; }
.has-sub > a {
  display: inline-flex; align-items: center; gap: 5px;
}
.has-sub > a::after {
  content: "";
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.45;
}
.nav-sub {
  display: none;
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  min-width: 232px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 40px rgba(27, 36, 51, 0.12);
  padding: 14px 8px 8px;
  z-index: 50;
}
.has-sub:hover .nav-sub,
.has-sub:focus-within .nav-sub { display: block; }
.nav-sub a {
  display: block;
  padding: 9px 12px;
  border-radius: 10px;
  color: var(--ink);
  font-size: 0.88rem;
}
.nav-sub a:hover { background: var(--bg); color: var(--ink); }
.nav-sub-all {
  margin-top: 4px;
  border-top: 1px solid var(--line);
  border-radius: 0 0 10px 10px;
  color: #2C48C8 !important;
  font-weight: 700;
}
.nav-hub-mobile {
  display: none;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  flex-shrink: 0;
}
.nav-hub-mobile:hover { color: var(--ink); }
.btn {
  display: inline-flex; padding: 12px 22px; border-radius: 14px;
  text-decoration: none; font-weight: 700; font-size: 0.92rem;
}
.btn-fill { background: var(--blue); color: #fff; }
.btn-ghost { background: var(--paper); border: 1px solid var(--line); color: var(--ink); }
.btn:hover { opacity: 0.92; }

nav.crumb {
  display: flex; flex-wrap: wrap; justify-content: flex-start;
  gap: 8px; align-items: center;
  font-size: 0.82rem; color: var(--muted);
  margin: 0 0 22px; padding: 0; max-width: none;
}
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { color: var(--ink); }
.crumb span[aria-hidden] { opacity: 0.45; }

.hero-guide {
  max-width: 1120px; margin: 0 auto; padding: 40px 40px 12px;
}
.pill {
  display: inline-block; background: var(--lilac); color: #2C48C8;
  padding: 6px 14px; border-radius: 999px; font-size: 0.78rem; font-weight: 700; margin-bottom: 16px;
}
h1 {
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  letter-spacing: -0.04em; line-height: 1.12; margin-bottom: 14px; max-width: 22ch;
}
.lead { color: var(--muted); font-size: 1.08rem; max-width: 62ch; }
.hero-guide a, .lead a { color: #2C48C8; }

.scope {
  max-width: 66ch;
  margin: 4px 0 28px;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.scope p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: none;
}
.scope p + p { margin-top: 8px; }
.scope strong { color: var(--ink); }
.prose .scope p {
  color: var(--muted);
  max-width: none;
  margin-bottom: 0;
  font-size: 0.95rem;
}

.layout {
  max-width: 1120px; margin: 0 auto; padding: 28px 40px 24px;
  display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 40px; align-items: start;
}
.prose { min-width: 0; }
.prose h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  letter-spacing: -0.03em; margin: 42px 0 12px; line-height: 1.2;
}
.prose h2:first-child { margin-top: 8px; }
.prose h3 { font-size: 1.05rem; margin: 26px 0 8px; }
.prose p, .prose li { color: var(--ink); font-size: 1.02rem; }
.prose p { margin-bottom: 14px; max-width: 66ch; }
.prose p.note { color: var(--muted); font-size: 0.9rem; }
.prose ul, .prose ol { margin: 0 0 18px 1.15em; max-width: 66ch; }
.prose li { margin-bottom: 8px; }
.prose a { color: #2C48C8; }
.prose strong { font-weight: 700; }

.panel {
  background: var(--paper); border: 1px solid var(--line); border-radius: 22px;
  padding: 22px 24px; margin: 20px 0 28px;
}
.panel h3 { margin-top: 0; }
.checks { list-style: none; margin-left: 0; }
.checks li {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 10px 0; border-bottom: 1px dashed var(--line);
}
.checks li:last-child { border-bottom: none; }
.dot {
  width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center; font-size: 0.75rem; font-weight: 800; margin-top: 1px;
}
.dot.ok { background: var(--mint); color: #1B7A4A; }
.dot.no { background: #FDE8E8; color: #C0392B; }
.dot.nb { background: var(--lilac); color: #2C48C8; }

.grid-2 {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0 28px;
}
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 20px 22px;
}
.card h3 { margin: 0 0 8px; font-size: 1rem; }
.card p { color: var(--muted); font-size: 0.92rem; margin: 0; }

.faq { margin: 12px 0 8px; }
.faq details {
  background: var(--paper); border: 1px solid var(--line); border-radius: 16px;
  padding: 0 18px; margin-bottom: 10px;
}
.faq summary {
  cursor: pointer; font-weight: 700; padding: 16px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 1.25em;
  text-align: center;
  color: var(--blue);
  font-weight: 800;
  line-height: 1;
}
.faq details[open] summary::after { content: "–"; }
.faq summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-radius: 8px;
}
.faq details p { color: var(--muted); padding-bottom: 16px; margin: 0; }

.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin: 16px 0 8px; }
.related a {
  display: block; background: var(--paper); border: 1px solid var(--line);
  border-radius: 16px; padding: 16px 18px; text-decoration: none; color: inherit;
}
.related a:hover { border-color: #B7C6E4; }
.related strong { display: block; margin-bottom: 4px; font-size: 0.95rem; }
.related span { color: var(--muted); font-size: 0.85rem; }

.aside-next {
  margin: 16px 0 4px; padding-top: 16px; border-top: 1px solid var(--line);
}
.aside-next .toc-title { margin-bottom: 4px; }
.aside-next ul { margin: 0 0 8px; }
.aside-next li { border-bottom: none; padding: 7px 0; }
.aside-next a { color: #2C48C8; font-size: 0.88rem; }

.aside {
  position: sticky; top: 100px;
  background: var(--paper); border: 1px solid var(--line); border-radius: 22px; padding: 22px;
}
.aside .toc-title { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 12px; color: var(--muted); }
.aside ol { list-style: none; margin: 0 0 20px; }
.aside a { color: var(--ink); text-decoration: none; font-size: 0.9rem; font-weight: 600; }
.aside li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.aside li:last-child { border-bottom: none; }
.aside .note { color: var(--muted); font-size: 0.88rem; margin-bottom: 12px; }
.aside .aside-cta {
  display: flex; flex-direction: column; gap: 8px; margin-top: 8px;
}
.aside .aside-cta .btn { justify-content: center; }

.fit {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px 24px;
  margin: 8px 0 28px;
}
.fit .fit-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}
.fit .checks { margin-bottom: 0; }
.fit-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin: 16px 0 0;
}
.fit-actions .btn { padding: 10px 18px; font-size: 0.88rem; }
.fit-actions a.quiet {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}
.fit-actions a.quiet:hover { color: var(--ink); }

.cta-band {
  max-width: 1120px; margin: 12px auto 0; padding: 0 40px 24px;
}
.cta {
  background: var(--lilac); border-radius: 28px; padding: 48px 32px; text-align: center;
}
.cta.cta-soft {
  background: var(--paper);
  border: 1px solid var(--line);
}
.cta h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); letter-spacing: -0.03em; margin-bottom: 10px; }
.cta p { color: var(--muted); max-width: 48ch; margin: 0 auto 24px; }
.cta-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.hub-product {
  max-width: 66ch;
  margin: 28px 0 12px;
}
.hub-product h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.55rem);
  letter-spacing: -0.03em;
  margin: 0 0 10px;
}
.hub-product p { color: var(--muted); margin: 0; }

.hub { max-width: 1120px; margin: 0 auto; padding: 8px 40px 32px; }
.hub-group { margin: 8px 0 36px; }
.hub-group h2 { font-size: clamp(1.25rem, 2.2vw, 1.55rem); letter-spacing: -0.03em; margin: 0 0 8px; }
.hub-group .lead { font-size: 0.98rem; margin-bottom: 16px; }
.hub-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.hub-cards a.card { text-decoration: none; color: inherit; display: block; }
.hub-cards a.card:hover { border-color: #B7C6E4; }
.hub-cards .card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.hub-cards .card p { margin: 0; }

.site-footer {
  max-width: 1120px; margin: 0 auto; padding: 8px 40px 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1fr;
  gap: 32px;
  padding: 28px 0 8px;
  border-top: 1px solid var(--line);
}
.footer-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.footer-col { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-col a { color: var(--muted); text-decoration: none; font-size: 0.88rem; }
.footer-col a:hover,
.footer-col a[aria-current="page"] { color: var(--ink); }
.footer-copy {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--muted); font-size: 0.85rem; gap: 16px; flex-wrap: wrap;
  padding: 20px 0 8px;
}
.footer-copy .logo { height: 32px; }
.footer-links { display: flex; gap: 20px; list-style: none; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

.notfound { max-width: 640px; margin: 0 auto; padding: 80px 40px; text-align: center; }
.notfound p { color: var(--muted); margin: 12px auto 28px; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .aside { position: static; }
  .grid-2, .related, .hub-cards { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .nav-links, .nav-login { display: none; }
  .nav-hub-mobile { display: inline; }
  .site-header nav, .hero-guide, .layout, .cta-band, .site-footer, .hub { padding-left: 20px; padding-right: 20px; }
  .btn { padding: 10px 14px; font-size: 0.85rem; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
}