:root {
  --ink: #101827;
  --muted: #607086;
  --paper: #ffffff;
  --soft: #f3f7fb;
  --line: #d8e2ed;
  --navy: #102a43;
  --blue: #1d6fb8;
  --cyan: #0ea5b7;
  --green: #128064;
  --amber: #d9902f;
  --shadow: 0 22px 58px rgba(16, 42, 67, 0.14);
  --radius: 22px;
  --max: 1168px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(29,111,184,0.06) 1px, transparent 1px),
    linear-gradient(180deg, #f8fbfd 0%, #ffffff 42%, #f4f8fb 100%);
  background-size: 34px 34px, auto;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.62;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(216, 226, 237, 0.9);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(100% - 32px, var(--max));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 900;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, var(--navy), var(--blue) 62%, var(--cyan));
  box-shadow: 0 14px 26px rgba(29, 111, 184, 0.26);
  font-size: 0.82rem;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.94rem;
  font-weight: 800;
}

.nav-links a {
  color: #2d3d50;
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--ink);
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 900;
  text-decoration: none;
  box-shadow: 0 13px 28px rgba(29, 111, 184, 0.24);
}

.button:hover {
  color: #fff;
  background: #155a97;
  text-decoration: none;
}

.button.secondary {
  background: #fff;
  color: var(--navy);
  border-color: var(--line);
  box-shadow: none;
}

.button.secondary:hover {
  color: var(--navy);
  background: var(--soft);
}

.hero {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 72px 0 52px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.9fr);
  gap: 44px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 8px 12px;
  border: 1px solid rgba(29, 111, 184, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  color: #0b1422;
  font-size: clamp(2.35rem, 5vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.075em;
}

.hero h1 span,
.page-hero h1 span {
  color: var(--blue);
}

.lead {
  max-width: 740px;
  margin: 24px 0 0;
  color: #44556b;
  font-size: clamp(1.05rem, 2vw, 1.26rem);
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.code-panel {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(243,247,251,0.9));
  box-shadow: var(--shadow);
}

.identifier-card {
  padding: 22px;
  border-radius: 24px;
  background: #0b1422;
  color: #fff;
  overflow: hidden;
}

.identifier-card h2 {
  margin: 0 0 18px;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.udi-code {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 18px;
  background: rgba(255,255,255,0.08);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.udi-code span {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: rgba(255,255,255,0.76);
}

.udi-code strong {
  color: #88e5ef;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.mini-card {
  padding: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 16px;
  background: rgba(255,255,255,0.08);
}

.mini-card strong {
  display: block;
  color: #fff;
}

.mini-card span {
  color: rgba(255,255,255,0.68);
  font-size: 0.9rem;
}

.section {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 56px 0;
}

.section-heading {
  max-width: 790px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.04;
  letter-spacing: -0.065em;
}

.section-heading p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.9);
  box-shadow: 0 12px 30px rgba(16, 42, 67, 0.06);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.22rem;
  letter-spacing: -0.035em;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.card-link {
  display: inline-flex;
  margin-top: 18px;
  font-weight: 900;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 28px;
  align-items: start;
}

.notice {
  padding: 24px;
  border: 1px solid rgba(217, 144, 47, 0.34);
  border-radius: var(--radius);
  background: #fff6e8;
}

.notice strong {
  color: #8c5a12;
}

.feature-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.feature-list strong {
  display: block;
  margin-bottom: 4px;
}

.faq {
  display: grid;
  gap: 12px;
}

details {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

summary {
  cursor: pointer;
  font-weight: 900;
}

details p {
  margin: 12px 0 0;
  color: var(--muted);
}

.cta {
  width: min(100% - 32px, var(--max));
  margin: 42px auto 72px;
  padding: clamp(28px, 6vw, 54px);
  border-radius: 34px;
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(14,165,183,0.34), transparent 18rem),
    linear-gradient(135deg, #0b1422, #102a43 58%, #1d6fb8);
  box-shadow: var(--shadow);
}

.cta h2 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.065em;
}

.cta p {
  max-width: 760px;
  color: rgba(255,255,255,0.82);
  font-size: 1.1rem;
}

.cta .button.secondary {
  border-color: rgba(255,255,255,0.22);
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.breadcrumb {
  width: min(100% - 32px, var(--max));
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.page-hero {
  width: min(100% - 32px, 940px);
  margin: 0 auto;
  padding: 66px 0 36px;
  text-align: center;
}

.page-hero .lead {
  margin-left: auto;
  margin-right: auto;
}

.article {
  width: min(100% - 32px, 910px);
  margin: 0 auto 72px;
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--line);
  border-radius: 30px;
  background: rgba(255,255,255,0.94);
  box-shadow: 0 18px 48px rgba(16, 42, 67, 0.08);
}

.article h2 {
  margin-top: 34px;
  font-size: 1.7rem;
  letter-spacing: -0.04em;
}

.article h2:first-child {
  margin-top: 0;
}

.article p,
.article li {
  color: #44556b;
}

.article ul {
  padding-left: 1.2rem;
}

.related {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.pill {
  display: inline-flex;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: #2d3d50;
  font-weight: 800;
  font-size: 0.92rem;
}

.source-note {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.94rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 34px 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  color: var(--muted);
  font-size: 0.94rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-weight: 800;
}

@media (max-width: 920px) {
  .menu-button {
    display: inline-block;
  }

  .nav-links {
    position: absolute;
    top: 74px;
    right: 16px;
    left: 16px;
    display: none;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links.is-open {
    display: flex;
  }

  .hero,
  .split {
    grid-template-columns: 1fr;
  }

  .grid,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav,
  .hero,
  .section,
  .cta,
  .breadcrumb,
  .page-hero,
  .article,
  .footer-inner {
    width: min(100% - 22px, var(--max));
  }

  .hero {
    padding-top: 42px;
  }

  .card,
  .notice,
  .identifier-card {
    padding: 18px;
  }
}