* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: #172033;
  background: #f7f9fd;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a {
  color: #313c8a;
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: #e03b8b;
  text-decoration: underline;
}

.help-header {
  border-bottom: 1px solid #d9e2f2;
  background: #ffffff;
}

.help-nav,
.help-shell,
.help-footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.help-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}

.help-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #172033;
  font-weight: 700;
}

.help-brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  object-fit: cover;
}

.help-nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
  font-size: 14px;
}

.help-shell {
  padding: 40px 0 56px;
}

.hero-panel,
.article-card,
.category-card,
.related-panel,
.toc-panel {
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #ffffff;
}

.hero-panel {
  padding: clamp(24px, 5vw, 46px);
}

.eyebrow {
  margin: 0 0 8px;
  color: #4a6cf7;
  font-size: 14px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  color: #121a31;
  line-height: 1.25;
}

h1 {
  max-width: 880px;
  font-size: clamp(32px, 5vw, 52px);
}

h2 {
  margin-top: 34px;
  font-size: 26px;
}

h3 {
  margin-top: 22px;
  font-size: 20px;
}

p {
  margin: 14px 0 0;
}

.lead {
  max-width: 820px;
  color: #4d5870;
  font-size: 18px;
}

.category-grid,
.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.category-card,
.article-card {
  padding: 22px;
}

.category-card ul,
.related-panel ul,
.toc-panel ul {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding-left: 20px;
}

.article-card p {
  color: #5d6578;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  align-items: start;
}

.article-main {
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #ffffff;
  padding: clamp(24px, 5vw, 44px);
}

.article-main article {
  max-width: 780px;
}

.article-main ul,
.article-main ol {
  padding-left: 22px;
}

.article-main li {
  margin: 8px 0;
}

.fee-term-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.fee-term-card {
  min-height: 138px;
  padding: 18px;
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #ffffff;
}

.fee-term-card h3 {
  margin-top: 0;
  font-size: 18px;
}

.fee-term-card p {
  color: #626d83;
  font-size: 14px;
  line-height: 1.55;
  word-break: break-word;
}

.term-card {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
  padding: 16px;
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #f7f9fd;
}

.term-card div {
  display: grid;
  gap: 5px;
}

.term-card span {
  color: #6b7485;
  font-size: 13px;
}

.term-card strong {
  color: #121a31;
  line-height: 1.45;
  word-break: break-word;
}

.toc-panel,
.related-panel {
  padding: 20px;
}

.toc-panel {
  position: sticky;
  top: 18px;
}

.cta-panel {
  margin-top: 34px;
  padding: 22px;
  border-radius: 8px;
  background: #eef3ff;
}

.case-panel {
  margin-top: 34px;
  padding: 22px;
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #f7f9fd;
}

.case-panel h2 {
  margin-top: 0;
}

.example-table-panel,
.article-media-panel {
  margin-top: 34px;
}

.example-table-panel h2,
.article-media-panel h2 {
  margin-top: 0;
}

.example-table-wrap {
  margin-top: 16px;
  overflow-x: auto;
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #ffffff;
}

.example-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 15px;
}

.example-table th,
.example-table td {
  padding: 12px 14px;
  border-bottom: 1px solid #e5ebf7;
  text-align: left;
  vertical-align: top;
}

.example-table th {
  color: #121a31;
  background: #eef3ff;
  font-weight: 700;
}

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

.article-media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.article-media-grid figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #ffffff;
}

.article-media-grid img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  background: #f7f9fd;
}

.article-media-grid figcaption {
  padding: 12px 14px;
  color: #5d6578;
  font-size: 14px;
  line-height: 1.55;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.faq-list details {
  padding: 14px 16px;
  border: 1px solid #d9e2f2;
  border-radius: 8px;
  background: #ffffff;
}

.faq-list summary {
  color: #121a31;
  cursor: pointer;
  font-weight: 700;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.primary-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 8px;
  font-weight: 700;
}

.primary-link {
  color: #ffffff;
  background: #4a6cf7;
}

.secondary-link {
  color: #313c8a;
  border: 1px solid #b9c4e8;
  background: #ffffff;
}

.help-footer {
  padding: 28px 0 42px;
  color: #6b7485;
  font-size: 14px;
}

.breadcrumb {
  margin-bottom: 18px;
  color: #6b7485;
  font-size: 14px;
}

@media (max-width: 860px) {
  .category-grid,
  .article-grid,
  .article-layout,
  .fee-term-grid,
  .article-media-grid,
  .term-card {
    grid-template-columns: 1fr;
  }

  .toc-panel {
    position: static;
  }

  .help-nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .help-nav-links {
    justify-content: flex-start;
  }
}