* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --brand-primary: #2563eb;
  --brand-primary-hover: #1d4ed8;
  --brand-primary-soft: #eff6ff;
  --brand-primary-border: #bfdbfe;
  --brand-accent: #0891b2;
  --brand-accent-hover: #0e7490;
  --brand-accent-soft: #ecfeff;
  --brand-accent-border: #a5f3fc;
  --brand-ink: #111827;
  --brand-muted: #475569;
  --brand-warning: #b45309;
}

body {
  min-height: 100vh;
  background: #f7fbff;
  color: #132033;
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.88);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #0f172a;
  font-size: 19px;
  font-weight: 900;
}

.brand-icon {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  color: #fff;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.nav-links a,
.back {
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 8px;
  background: #fff;
  padding: 8px 12px;
  color: #475569;
  font-size: 13px;
  font-weight: 800;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
  gap: 28px;
  align-items: center;
  padding: 50px 0 30px;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 16px;
  border: 1px solid var(--brand-primary-border);
  border-radius: 999px;
  background: var(--brand-primary-soft);
  padding: 6px 11px;
  color: var(--brand-primary-hover);
  font-size: 13px;
  font-weight: 900;
}

h1 {
  max-width: 780px;
  color: #0f172a;
  font-size: 52px;
  line-height: 1.08;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin-top: 18px;
  color: #475569;
  font-size: 18px;
}

.updated {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  color: #64748b;
  font-size: 13px;
  font-weight: 800;
}

.updated span {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  padding: 5px 10px;
}

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

.btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 900;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.btn:active {
  transform: scale(.98);
}

.btn-primary {
  border-color: var(--brand-primary);
  background: var(--brand-primary);
  color: #fff;
  box-shadow: 0 14px 34px rgba(37, 99, 235, 0.18);
}

.btn-primary:hover {
  border-color: var(--brand-primary-hover);
  background: var(--brand-primary-hover);
}

.btn-secondary {
  border-color: rgba(37, 99, 235, 0.18);
  background: #fff;
  color: var(--brand-primary-hover);
}

.btn-secondary:hover {
  border-color: var(--brand-primary-border);
  background: var(--brand-primary-soft);
}

.summary-panel {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 8px;
  background: #fff;
  padding: 22px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.06);
}

.summary-panel h2 {
  color: #0f172a;
  font-size: 20px;
}

.summary-panel p,
.summary-panel li {
  color: #64748b;
  font-size: 15px;
}

.summary-panel ul {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  list-style: none;
}

.summary-panel li {
  border-left: 3px solid var(--brand-warning);
  padding-left: 10px;
}

.notice {
  border: 1px solid rgba(245, 158, 11, 0.22);
  border-radius: 8px;
  background: #fffbeb;
  padding: 14px 16px;
  color: #92400e;
  font-size: 14px;
  font-weight: 800;
}

.answer-box {
  border: 1px solid var(--brand-accent-border);
  border-radius: 8px;
  background: var(--brand-accent-soft);
  padding: 22px;
}

.answer-box .section-title {
  margin-bottom: 10px;
}

.answer-box p {
  max-width: 860px;
  color: #475569;
  font-size: 16px;
}

.answer-box ul {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  padding-left: 20px;
  color: #475569;
  font-size: 15px;
}

.answer-box strong {
  color: #0f172a;
}

.section {
  padding: 30px 0;
}

.section-title {
  max-width: 820px;
  color: #0f172a;
  font-size: 30px;
  line-height: 1.22;
}

.section-copy {
  max-width: 780px;
  margin-top: 10px;
  color: #64748b;
  font-size: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.card {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 8px;
  background: #fff;
  padding: 20px;
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.045);
}

.card strong,
.card h3 {
  color: #0f172a;
  font-size: 18px;
  line-height: 1.35;
}

.card p {
  margin-top: 9px;
  color: #64748b;
  font-size: 15px;
}

.card ul {
  display: grid;
  gap: 8px;
  margin-top: 10px;
  padding-left: 18px;
  color: #64748b;
  font-size: 15px;
}

.tag {
  display: inline-flex;
  margin-bottom: 12px;
  border-radius: 999px;
  background: var(--brand-primary-soft);
  padding: 4px 9px;
  color: var(--brand-primary-hover);
  font-size: 12px;
  font-weight: 900;
}

.steps,
.link-list,
.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.step,
.link-list a,
.faq-list details {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 8px;
  background: #fff;
  padding: 16px 18px;
}

.step {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 16px;
}

.step span {
  color: var(--brand-accent-hover);
  font-size: 13px;
  font-weight: 900;
}

.step h3,
.faq-list summary {
  color: #0f172a;
  font-weight: 900;
}

.step p,
.faq-list p {
  margin-top: 6px;
  color: #64748b;
  font-size: 15px;
}

.link-list a {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: #334155;
  font-weight: 850;
}

.link-list span {
  color: var(--brand-primary);
  font-size: 13px;
  white-space: nowrap;
}

.comparison-wrap {
  margin-top: 18px;
  overflow-x: auto;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 8px;
  background: #fff;
}

.comparison-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}

.comparison-table th {
  background: #f8fafc;
  color: #0f172a;
  font-size: 14px;
  font-weight: 900;
}

.comparison-table td {
  color: #64748b;
  font-size: 14px;
}

.comparison-table tr:last-child td {
  border-bottom: 0;
}

.cta-band {
  margin: 32px 0 8px;
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  background: #ffffff;
  padding: 34px 0;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.cta-inner h2 {
  color: #0f172a;
  font-size: 26px;
  line-height: 1.25;
}

.cta-inner p {
  max-width: 700px;
  margin-top: 8px;
  color: #64748b;
}

footer {
  padding: 26px 0 40px;
  color: #64748b;
  font-size: 14px;
  text-align: center;
}

.btn:focus-visible,
.nav a:focus-visible,
.link-list a:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.28);
  outline-offset: 3px;
}

@media (max-width: 860px) {
  .hero,
  .grid,
  .cta-inner {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 34px;
  }

  h1 {
    font-size: 38px;
  }

  .lead {
    font-size: 16px;
  }

  .actions,
  .cta-inner {
    align-items: stretch;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    font-size: 33px;
  }

  .section-title {
    font-size: 25px;
  }

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

  .link-list a {
    flex-direction: column;
  }

  .link-list span {
    white-space: normal;
  }
}