:root {
  --primary: #123b63;
  --accent: #1f78c8;
  --background: #f6f8fb;
  --surface: #ffffff;
  --text: #17212b;
  --muted: #5d6a78;
  --border: rgba(18, 59, 99, 0.12);
  --border-strong: rgba(18, 59, 99, 0.2);
  --shadow: 0 18px 48px rgba(17, 32, 48, 0.08);
  --shadow-soft: 0 10px 26px rgba(17, 32, 48, 0.06);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --container: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(31, 120, 200, 0.08), transparent 32%),
    radial-gradient(circle at 85% 0%, rgba(18, 59, 99, 0.08), transparent 24%),
    linear-gradient(180deg, #fbfcfe 0%, var(--background) 28%, #eef3f8 100%);
  line-height: 1.65;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

p,
li {
  text-wrap: pretty;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.65rem;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
  color: var(--text);
}

p {
  margin: 0 0 1rem;
  color: var(--muted);
}

ul,
ol {
  margin: 0;
  padding-left: 1.15rem;
}

li + li {
  margin-top: 0.45rem;
}

strong {
  color: var(--text);
}

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(246, 248, 251, 0.88);
  backdrop-filter: blur(18px);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 0.95rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 0 12px 24px rgba(18, 59, 99, 0.24);
  flex: 0 0 auto;
}

.brand-text {
  min-width: 0;
}

.brand-text strong,
.brand-text small {
  display: block;
  overflow-wrap: anywhere;
}

.brand-text strong {
  font-size: 1rem;
}

.brand-text small {
  color: var(--muted);
  font-size: 0.85rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.72rem 0.95rem;
  border-radius: 999px;
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text);
  text-align: center;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.94);
  color: var(--primary);
  box-shadow: var(--shadow-soft);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.7rem;
  min-height: 2.75rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.nav-toggle-icon {
  display: grid;
  gap: 0.22rem;
}

.nav-toggle-icon span {
  display: block;
  width: 1rem;
  height: 0.12rem;
  border-radius: 999px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.nav-toggle.is-open .nav-toggle-icon span:nth-child(1) {
  transform: translateY(0.34rem) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-icon span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle-icon span:nth-child(3) {
  transform: translateY(-0.34rem) rotate(-45deg);
}

.page-main {
  padding: 1.15rem 0 4rem;
}

.hero {
  padding: 0.2rem 0 1rem;
}

.hero-grid,
.content-grid,
.footer-grid {
  display: grid;
  gap: 1rem;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.3fr) minmax(18rem, 0.9fr);
  align-items: start;
}

.content-grid {
  grid-template-columns: minmax(0, 1.35fr) minmax(16rem, 0.82fr);
  align-items: start;
}

.footer-grid {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  align-items: start;
}

.card,
.hero-panel,
.topic-card,
.content-card,
.side-card,
.faq-item,
.notice-banner,
.summary-card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-panel,
.topic-card,
.content-card,
.side-card,
.faq-item,
.notice-banner,
.summary-card {
  padding: 1.35rem;
}

.hero-panel {
  position: relative;
  overflow: hidden;
}

.hero-panel::after {
  content: "";
  position: absolute;
  right: -5rem;
  bottom: -6rem;
  width: 16rem;
  height: 16rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(31, 120, 200, 0.18), transparent 68%);
  pointer-events: none;
}

.page-intro {
  margin-bottom: 1rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.8rem;
  padding: 0.42rem 0.72rem;
  border-radius: 999px;
  background: rgba(18, 59, 99, 0.08);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow.accent {
  background: rgba(31, 120, 200, 0.1);
  color: var(--accent);
}

.hero-title,
.page-title {
  font-size: clamp(2rem, 5vw, 4rem);
  max-width: 12ch;
}

.page-title {
  max-width: 14ch;
}

.hero-copy,
.page-copy,
.section-copy {
  max-width: 60ch;
  font-size: clamp(1rem, 1.8vw, 1.12rem);
}

.hero-actions,
.link-row,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.chip-row {
  margin-top: 1rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(18, 59, 99, 0.1);
  background: rgba(255, 255, 255, 0.88);
  color: var(--muted);
  font-weight: 700;
  font-size: 0.93rem;
  box-shadow: var(--shadow-soft);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.85rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #225182);
  color: #fff;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-align: center;
  white-space: normal;
  box-shadow: 0 14px 32px rgba(18, 59, 99, 0.24);
}

.button:hover {
  color: #fff;
  background: linear-gradient(135deg, #0f3558, var(--accent));
}

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

.button.secondary:hover,
.button.ghost:hover {
  color: var(--accent);
  border-color: rgba(31, 120, 200, 0.28);
  background: rgba(255, 255, 255, 0.96);
}

.button.ghost {
  background: rgba(18, 59, 99, 0.08);
  color: var(--primary);
  box-shadow: none;
}

.section {
  padding-top: 1rem;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h2 {
  font-size: clamp(1.65rem, 4vw, 2.45rem);
  max-width: 14ch;
}

.section-heading p {
  max-width: 52ch;
}

.card-grid,
.faq-grid,
.footer-nav {
  display: grid;
  gap: 1rem;
}

.card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.faq-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.footer-nav {
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
}

.summary-card h3,
.topic-card h3,
.content-card h2,
.content-card h3,
.faq-item h3,
.side-card h2,
.side-card h3,
.notice-banner h2 {
  font-size: 1.28rem;
}

.topic-tag {
  display: inline-flex;
  margin-bottom: 0.65rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.list-plain,
.check-list {
  padding: 0;
  list-style: none;
}

.check-list {
  display: grid;
  gap: 0.75rem;
}

.check-list li {
  position: relative;
  padding-left: 1.45rem;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.list-tight li + li {
  margin-top: 0.4rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--primary);
}

.separator {
  opacity: 0.55;
}

.side-card {
  position: static;
}

.content-grid > .side-card {
  position: sticky;
  top: 5.4rem;
}

.notice-banner {
  background:
    radial-gradient(circle at 100% 0%, rgba(255, 255, 255, 0.18), transparent 28%),
    linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
}

.notice-banner h2,
.notice-banner p,
.notice-banner li,
.notice-banner a {
  color: #fff;
}

.footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.6);
}

.footer p {
  max-width: 52ch;
}

.footer-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
  color: var(--muted);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.footer-nav a:hover,
.footer-nav a[aria-current="page"] {
  color: var(--primary);
}

.kicker {
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.small-note,
.muted {
  color: var(--muted);
}

.floating-cta {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transform: translateY(1rem);
  transition: opacity 180ms ease, transform 180ms ease;
}

body.has-scrolled .floating-cta {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.55rem);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-list a,
  .site-nav .button {
    width: 100%;
  }

  .hero-grid,
  .content-grid,
  .footer-grid,
  .faq-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .content-grid > .side-card {
    position: static;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(var(--container), calc(100% - 1rem));
  }

  .header-inner {
    min-height: 4rem;
  }

  .brand-text small {
    display: none;
  }

  .hero-panel,
  .topic-card,
  .content-card,
  .side-card,
  .faq-item,
  .notice-banner,
  .summary-card {
    padding: 1.05rem;
    border-radius: 1.2rem;
  }

  .hero-title,
  .page-title {
    max-width: 100%;
    font-size: clamp(1.95rem, 10vw, 2.7rem);
  }

  .floating-cta {
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.75rem;
    width: auto;
  }
}