:root {
  --article-ink: #001d3d;
  --article-blue: #0878e8;
  --article-navy: #05284e;
  --article-line: #d9e7f6;
  --article-soft: #f3f8fe;
  --article-muted: #60758e;
  --article-green: #0b9f78;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--article-ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
a { color: inherit; }
.article-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}
.article-hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 104px;
  color: #fff;
  text-align: center;
  background:
    radial-gradient(circle at 18% 20%, rgba(46, 142, 255, .34), transparent 31%),
    radial-gradient(circle at 82% 64%, rgba(39, 113, 207, .3), transparent 30%),
    linear-gradient(135deg, #041a34, #073664 72%, #0a4d89);
}
.article-hero::after {
  position: absolute;
  inset: auto 0 0;
  height: 78px;
  content: "";
  background: linear-gradient(transparent, #fff);
}
.article-hero .article-shell { position: relative; z-index: 1; }
.article-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
  color: #b8d9ff;
  font-size: 13px;
}
.article-breadcrumb a { text-decoration: none; }
.article-breadcrumb a:hover { color: #fff; }
.article-category {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 7px 12px;
  border: 1px solid rgba(166, 211, 255, .25);
  border-radius: 999px;
  color: #d6eaff;
  background: rgba(255, 255, 255, .06);
  font-size: 13px;
  font-weight: 700;
}
.article-category::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  content: "";
  background: #35d3a3;
}
.article-hero h1 {
  max-width: 900px;
  margin: 0 auto;
  font-size: clamp(36px, 6vw, 62px);
  line-height: 1.16;
  letter-spacing: -.045em;
}
.article-hero .summary {
  max-width: 780px;
  margin: 24px auto 0;
  color: rgba(235, 246, 255, .82);
  font-size: 18px;
  line-height: 1.85;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  margin-top: 26px;
  color: rgba(215, 234, 252, .7);
  font-size: 13px;
}
.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  align-items: start;
  gap: 48px;
  padding: 38px 0 88px;
}
.article-toc {
  position: sticky;
  top: 82px;
  padding: 22px;
  border: 1px solid var(--article-line);
  border-radius: 18px;
  background: #f8fbff;
}
.article-toc strong {
  display: block;
  margin-bottom: 13px;
  font-size: 14px;
}
.article-toc a {
  display: block;
  padding: 8px 0;
  color: #526d87;
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
}
.article-toc a:hover { color: var(--article-blue); }
.article-content { min-width: 0; }
.article-answer {
  padding: 28px 30px;
  border: 1px solid #b9d8fa;
  border-radius: 22px;
  background: linear-gradient(135deg, #eef7ff, #f8fbff);
}
.article-answer .answer-label {
  display: block;
  margin-bottom: 10px;
  color: var(--article-blue);
  font-size: 13px;
  font-weight: 800;
}
.article-answer p {
  margin: 0;
  color: #183d62;
  font-size: 17px;
  line-height: 1.9;
}
.article-section {
  padding-top: 48px;
  scroll-margin-top: 76px;
}
.article-section h2 {
  margin: 0 0 20px;
  font-size: clamp(27px, 4vw, 36px);
  line-height: 1.35;
  letter-spacing: -.035em;
}
.article-section h3 {
  margin: 28px 0 10px;
  font-size: 20px;
}
.article-section p {
  margin: 0 0 16px;
  color: #425f7c;
  font-size: 16px;
  line-height: 1.9;
}
.article-section ul,
.article-section ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
.article-list {
  display: grid;
  gap: 12px;
}
.article-list li {
  position: relative;
  padding: 16px 18px 16px 48px;
  border: 1px solid var(--article-line);
  border-radius: 16px;
  color: #385673;
  background: #fff;
  line-height: 1.75;
}
.article-list li::before {
  position: absolute;
  top: 17px;
  left: 18px;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  content: "✓";
  color: #fff;
  background: var(--article-blue);
  font-size: 11px;
  font-weight: 800;
}
.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.article-card {
  padding: 24px;
  border: 1px solid var(--article-line);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(0, 43, 89, .05);
}
.article-card .card-number {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  border-radius: 12px;
  color: #fff;
  background: var(--article-blue);
  font-size: 13px;
  font-weight: 800;
}
.article-card h3 { margin: 0 0 9px; }
.article-card p { margin: 0; font-size: 14px; }
.article-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--article-line);
  border-radius: 18px;
}
.article-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: #fff;
}
.article-table th,
.article-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--article-line);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
}
.article-table th {
  color: #173c61;
  background: #edf6ff;
}
.article-table td { color: #4c6781; }
.article-table tr:last-child td { border-bottom: 0; }
.article-note {
  margin-top: 20px;
  padding: 20px 22px;
  border-left: 4px solid var(--article-blue);
  border-radius: 0 14px 14px 0;
  color: #46627d;
  background: var(--article-soft);
  font-size: 14px;
  line-height: 1.8;
}
.article-faq {
  display: grid;
  gap: 12px;
}
.article-faq details {
  padding: 18px 20px;
  border: 1px solid var(--article-line);
  border-radius: 16px;
  background: #fff;
}
.article-faq summary {
  cursor: pointer;
  font-weight: 700;
  line-height: 1.6;
}
.article-faq details p {
  margin: 14px 0 0;
  font-size: 14px;
}
.article-sources {
  padding: 24px;
  border-radius: 18px;
  background: #f7f9fc;
}
.article-sources a {
  display: block;
  margin-top: 10px;
  color: #176fc7;
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
}
.article-sources a:hover { text-decoration: underline; }
.article-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 50px;
  padding: 28px 30px;
  border-radius: 22px;
  color: #dcecff;
  background: linear-gradient(135deg, #05284e, #0b5aa8);
}
.article-cta h2 {
  margin: 0 0 8px;
  color: #fff;
  font-size: 24px;
}
.article-cta p { margin: 0; color: #cfe5fb; font-size: 14px; }
.article-cta a {
  flex: 0 0 auto;
  padding: 12px 18px;
  border-radius: 999px;
  color: #fff;
  background: #1685f8;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.article-footer {
  padding: 38px 0;
  border-top: 1px solid var(--article-line);
  background: #f8fbff;
}
.article-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.article-footer img { width: 165px; height: auto; display: block; }
.article-footer p { margin: 8px 0 0; color: var(--article-muted); font-size: 13px; }
.article-footer-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; }
.article-footer-links a { color: #31516f; text-decoration: none; }
.article-footer-links a:hover { color: var(--article-blue); }

@media (max-width: 860px) {
  .article-hero { padding: 68px 0 88px; }
  .article-layout { grid-template-columns: 1fr; gap: 24px; }
  .article-toc { position: static; }
  .article-grid { grid-template-columns: 1fr; }
  .article-cta { display: block; }
  .article-cta a { display: inline-flex; margin-top: 18px; }
  .article-footer-inner { display: block; }
  .article-footer-links { margin-top: 24px; }
}