:root {
  color-scheme: light;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --quiet: #86868b;
  --blue: #075ba8;
  --blue-hover: #004b8f;
  --line: rgba(29, 29, 31, 0.1);
  --surface: rgba(255, 255, 255, 0.88);
  --page: #f5f5f7;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--page);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  line-height: 1.72;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 160ms ease;
}

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

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 245, 247, 0.86);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
}

.nav {
  width: min(920px, calc(100% - 32px));
  min-height: 62px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  box-shadow: 0 5px 16px rgba(0, 69, 128, 0.16);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 560;
}

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

.page {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 88px;
}

.hero {
  margin-bottom: 44px;
}

.eyebrow {
  margin: 0 0 13px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 700px;
  font-size: clamp(36px, 7vw, 56px);
  font-weight: 680;
  line-height: 1.06;
  letter-spacing: -0.052em;
}

.lede {
  max-width: 650px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.72;
  letter-spacing: -0.01em;
}

.updated {
  margin: 12px 0 0;
  color: var(--quiet);
  font-size: 12px;
}

.notice {
  margin: 0 0 40px;
  padding: 20px 22px;
  border: 1px solid rgba(7, 91, 168, 0.13);
  border-radius: 18px;
  background: rgba(230, 242, 252, 0.66);
  color: #174e7d;
  font-size: 14px;
  font-weight: 530;
}

.content-section {
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.content-section h2 {
  margin: 0 0 13px;
  font-size: 21px;
  font-weight: 660;
  line-height: 1.3;
  letter-spacing: -0.026em;
}

.content-section h3 {
  margin: 23px 0 7px;
  font-size: 15px;
  font-weight: 660;
  letter-spacing: -0.012em;
}

.content-section p,
.content-section li {
  color: var(--muted);
  font-size: 14px;
}

.content-section p {
  margin: 10px 0;
}

.content-section ul,
.content-section ol {
  margin: 12px 0 0;
  padding-left: 21px;
}

.content-section li + li {
  margin-top: 8px;
}

.content-section strong {
  color: #343438;
  font-weight: 650;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 24px 0 42px;
}

.quick-card {
  display: block;
  min-height: 132px;
  padding: 19px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.035);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.quick-card:hover {
  color: var(--ink);
  border-color: rgba(7, 91, 168, 0.24);
  transform: translateY(-2px);
  box-shadow: 0 14px 38px rgba(0, 59, 112, 0.07);
}

.quick-card span {
  display: block;
  margin-bottom: 13px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
}

.quick-card h2 {
  margin: 0;
  font-size: 16px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.quick-card p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.steps li {
  position: relative;
  min-height: 54px;
  padding: 14px 16px 14px 50px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.7);
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 15px;
  top: 14px;
  display: grid;
  width: 23px;
  height: 23px;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: white;
  font-size: 11px;
  font-weight: 700;
}

.faq-list {
  margin-top: 10px;
  border-top: 1px solid var(--line);
}

details {
  border-bottom: 1px solid var(--line);
}

summary {
  position: relative;
  padding: 19px 36px 19px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 630;
  line-height: 1.45;
  letter-spacing: -0.012em;
}

summary::-webkit-details-marker {
  display: none;
}

summary:focus-visible {
  outline: 2px solid rgba(7, 91, 168, 0.45);
  outline-offset: 4px;
  border-radius: 8px;
}

summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 17px;
  color: var(--quiet);
  font-size: 20px;
  font-weight: 400;
  transition: transform 180ms ease;
}

details[open] summary::after {
  transform: rotate(45deg);
}

details p {
  margin: -5px 36px 19px 0;
  color: var(--muted);
  font-size: 14px;
}

.contact-panel {
  padding: 25px;
  border: 1px solid rgba(7, 91, 168, 0.14);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 16px 50px rgba(0, 45, 90, 0.055);
}

.contact-panel h2 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.025em;
}

.contact-panel p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 17px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 650;
  transition: background 160ms ease, transform 160ms ease;
}

.button:hover {
  background: var(--blue-hover);
  color: #fff;
  transform: translateY(-1px);
}

.button.secondary {
  border: 1px solid var(--line);
  background: #f5f5f7;
  color: var(--ink);
}

.footer {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0 34px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--quiet);
  font-size: 12px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
}

@media (max-width: 680px) {
  .nav {
    min-height: 58px;
  }

  .brand-label-long {
    display: none;
  }

  .nav-links {
    gap: 16px;
  }

  .page {
    padding: 48px 0 64px;
  }

  .hero {
    margin-bottom: 34px;
  }

  .lede {
    font-size: 15px;
  }

  .notice {
    padding: 17px 18px;
  }

  .content-section {
    padding: 29px 0;
  }

  .quick-grid {
    grid-template-columns: 1fr;
  }

  .quick-card {
    min-height: 0;
  }

  .footer {
    flex-direction: column;
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}