:root {
  --ink: #0f1a24;
  --navy: #142b3c;
  --navy-2: #1e4157;
  --paper: #fffdf8;
  --ivory: #f4f0e8;
  --muted: #5a6872;
  --line: #d7d2c9;
  --gold: #b99052;
  --teal: #36767a;
  --risk: #7b3b35;
  --max: 1160px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(215, 210, 201, .9);
  background: rgba(255, 253, 248, .96);
  backdrop-filter: blur(12px);
}
.header-inner, .site-footer, main {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}
.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand img { width: 118px; height: 48px; object-fit: contain; }
.brand span { display: grid; line-height: 1.22; }
.brand b { font-size: 18px; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 13px; font-weight: 700; }
nav { display: flex; gap: 6px; font-size: 15px; font-weight: 800; }
nav a { padding: 9px 10px; border-radius: 4px; }
nav a:hover { background: var(--ivory); }
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}
.breadcrumb a:hover { color: var(--teal); }
.knowledge-hero, .article-hero {
  padding: 70px clamp(24px, 6vw, 72px);
  color: white;
  background:
    radial-gradient(circle at 82% 22%, rgba(54, 118, 122, .42), transparent 28%),
    linear-gradient(135deg, var(--navy), #0b1822 72%);
}
.eyebrow {
  color: #d8ba82;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1, h2, h3, p { text-wrap: pretty; }
h1 {
  max-width: 850px;
  margin: 20px 0 0;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.08;
  letter-spacing: -.04em;
}
.article-hero h1 { font-size: clamp(34px, 5vw, 58px); }
.knowledge-hero > p, .dek {
  max-width: 830px;
  margin: 24px 0 0;
  color: #e6edf1;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 650;
}
.meta {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin: 42px 0 0;
  padding: 0;
  background: rgba(255, 255, 255, .2);
}
.knowledge-hero .meta { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.meta div { padding: 14px; background: rgba(8, 22, 31, .76); }
.meta dt { color: #b8c5cc; font-size: 12px; font-weight: 800; }
.meta dd { margin: 4px 0 0; color: white; font-size: 14px; font-weight: 850; }
.boundary-banner, .contact-note {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 26px;
  margin: 34px 0 0;
  padding: 26px 30px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  background: var(--ivory);
}
.boundary-banner b, .contact-note b { font-size: 19px; }
.boundary-banner p, .contact-note p { margin: 0; color: #394853; }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .related h2 {
  margin: 12px 0 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.16;
}
.knowledge-list, .question-index, .related { padding: 78px 0 20px; }
.article-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.article-cards article {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 20px;
  padding: 30px 28px 30px 0;
  border-bottom: 1px solid var(--line);
}
.article-cards article:nth-child(odd) { border-right: 1px solid var(--line); }
.article-cards article:nth-child(even) { padding-left: 28px; }
.article-cards article > span, .section-kicker {
  color: var(--gold);
  font-weight: 900;
  letter-spacing: .08em;
}
.article-cards h3 { margin: 0; font-size: 23px; line-height: 1.3; }
.article-cards h3 a:hover { color: var(--teal); }
.article-cards p { margin: 12px 0 0; color: var(--muted); }
.read-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--teal);
  font-size: 14px;
  font-weight: 900;
}
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { padding: 22px 0; border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; font-size: 20px; font-weight: 850; }
.faq-list p { max-width: 900px; margin: 14px 0 0; color: #394853; }
.faq-list a { display: inline-block; margin-top: 10px; color: var(--teal); font-weight: 850; }
.answer-lead {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 28px;
  margin-top: 34px;
  padding: 32px;
  border: 1px solid var(--line);
  background: var(--ivory);
}
.answer-lead span { color: var(--gold); font-weight: 900; }
.answer-lead p { margin: 0; font-size: 21px; line-height: 1.72; font-weight: 720; }
.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 64px;
  align-items: start;
  padding: 40px 0 20px;
}
.article-body section { padding: 38px 0; border-bottom: 1px solid var(--line); }
.article-body section:first-child { padding-top: 10px; }
.article-body h2 { margin: 6px 0 22px; font-size: 33px; line-height: 1.2; }
.article-body > section > p:not(.section-kicker) { color: #44535e; }
.step-list, .bullet-list, .source-list { margin: 0; padding: 0; list-style: none; }
.step-list { display: grid; gap: 12px; }
.step-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 18px;
  background: var(--ivory);
}
.step-list span { color: var(--gold); font-weight: 900; }
.step-list p { margin: 0; }
.bullet-list { display: grid; gap: 12px; }
.bullet-list li { position: relative; padding-left: 24px; }
.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
}
.risk-section { border-left: 4px solid #a85a51; padding-left: 28px !important; }
.risk-section .bullet-list li::before { background: var(--risk); }
.source-list { display: grid; gap: 10px; }
.source-list a { color: var(--teal); text-decoration: underline; text-underline-offset: 3px; }
.article-aside {
  position: sticky;
  top: 108px;
  display: grid;
  gap: 10px;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--ivory);
}
.article-aside b { margin-bottom: 4px; }
.article-aside a { color: var(--teal); font-size: 14px; font-weight: 850; }
.article-aside p { margin: 12px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.related-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.related-grid a { min-height: 180px; padding: 24px; border: 1px solid var(--line); background: var(--ivory); }
.related-grid b { display: block; font-size: 19px; line-height: 1.35; }
.related-grid span { display: block; margin-top: 12px; color: var(--muted); font-size: 14px; }
.related-grid a:hover { border-color: var(--gold); transform: translateY(-2px); }
.contact-note {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  margin: 64px 0 78px;
}
.contact-note div { display: grid; grid-template-columns: 170px minmax(0, 1fr); gap: 20px; align-items: start; }
.contact-note a {
  padding: 11px 16px;
  border: 1px solid var(--navy);
  color: var(--navy);
  font-size: 14px;
  font-weight: 900;
}
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
}
.site-footer p { max-width: 720px; margin: 8px 0 0; color: var(--muted); font-size: 13px; }
.site-footer > div:last-child { display: flex; gap: 16px; font-size: 14px; font-weight: 800; }
@media (max-width: 860px) {
  .header-inner { min-height: 68px; }
  .brand img { width: 92px; }
  .brand small, nav a:not(:nth-last-child(3)):not(:last-child) { display: none; }
  .knowledge-hero, .article-hero { padding: 48px 24px; }
  .meta, .knowledge-hero .meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-grid { grid-template-columns: 1fr; gap: 10px; }
  .article-aside { position: static; order: -1; grid-template-columns: repeat(5, auto); overflow-x: auto; }
  .article-aside b, .article-aside p { display: none; }
  .article-cards, .related-grid { grid-template-columns: 1fr; }
  .article-cards article:nth-child(odd) { border-right: 0; }
  .article-cards article:nth-child(even) { padding-left: 0; }
  .contact-note, .contact-note div, .boundary-banner, .answer-lead { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .header-inner, .site-footer, main { width: min(var(--max), calc(100% - 24px)); }
  nav { display: none; }
  h1 { font-size: 38px; }
  .knowledge-hero, .article-hero { padding: 38px 20px; }
  .meta, .knowledge-hero .meta { grid-template-columns: 1fr 1fr; }
  .article-cards article { grid-template-columns: 40px minmax(0, 1fr); padding-right: 0; }
  .answer-lead { padding: 24px; }
  .answer-lead p { font-size: 18px; }
  .step-list li { grid-template-columns: 38px minmax(0, 1fr); padding: 15px; }
  .article-body h2 { font-size: 28px; }
  .article-aside { grid-template-columns: repeat(5, max-content); }
  .site-footer { display: grid; }
}