:root {
  --ink: #16232c;
  --ink-soft: #3c4d58;
  --paper: #f3eee4;
  --paper-2: #e8e0d2;
  --oil: #c45c14;
  --oil-deep: #8a3c0c;
  --steel: #1f3a4a;
  --line: #cfc3ae;
  --ok: #2d6a4f;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 47px, rgba(196, 92, 20, 0.08) 47px, rgba(196, 92, 20, 0.08) 48px, transparent 48px),
    radial-gradient(circle at 1px 1px, rgba(31, 58, 74, 0.06) 1px, transparent 0) 0 0 / 22px 22px,
    var(--paper);
  font: 17px/1.75 "Iowan Old Style", "Palatino Linotype", "Songti SC", "Source Han Serif SC", "Noto Serif SC", "Georgia", serif;
}

a { color: var(--oil-deep); text-underline-offset: 3px; }
a:hover { color: var(--oil); }
img { max-width: 100%; }

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
}
.skip:focus { left: 12px; background: #fff; padding: 8px 12px; }

.topbar {
  background: var(--steel);
  color: #efe7d8;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.topbar-inner, .nav-inner, .wrap, .foot-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
}
.topbar a { color: #f0c089; }

.site-header {
  background: #111c23;
  color: #f6efe3;
  border-bottom: 4px solid var(--oil);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0 14px;
}
.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  min-width: 180px;
}
.brand-en {
  font-family: "Segoe UI", sans-serif;
  font-size: 11px;
  letter-spacing: 0.28em;
  color: #f0c089;
}
.brand-zh {
  font-size: 26px;
  line-height: 1.15;
  font-weight: 700;
}
.brand-sub {
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-size: 12px;
  color: #c9d4da;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}
.nav a {
  color: #efe7d8;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.nav a:hover, .nav a[aria-current="page"] {
  color: #f0c089;
  border-bottom-color: #f0c089;
}

.hero, .page-hero {
  padding: 48px 0 28px;
}
.kicker {
  font-family: "Segoe UI", sans-serif;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--oil);
  text-transform: uppercase;
  margin: 0 0 10px;
}
h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}
.lead, .answer-box {
  font-size: 19px;
  max-width: 46rem;
}
.answer-box {
  background: #fffdf8;
  border-left: 5px solid var(--oil);
  padding: 18px 20px;
  margin: 0 0 28px;
  box-shadow: 0 1px 0 var(--line);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--ink-soft);
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-size: 13px;
  margin: 16px 0 0;
}
.crumbs {
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0 0 18px;
}
.crumbs a { color: inherit; }

.grid-3, .grid-2, .cards {
  display: grid;
  gap: 16px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card, .stat, article.block {
  background: rgba(255, 253, 248, 0.92);
  border: 1px solid var(--line);
  padding: 18px 18px 16px;
}
.card h2, .card h3 { margin-top: 0; }
.stat {
  border-top: 4px solid var(--oil);
}
.stat b {
  display: block;
  font-size: 34px;
  line-height: 1.1;
  color: var(--oil-deep);
}
.stat span { color: var(--ink-soft); font-size: 14px; }

.section { padding: 18px 0 36px; }
.section h2 {
  margin: 0 0 14px;
  font-size: 28px;
}
.num {
  font-family: "Segoe UI", sans-serif;
  color: var(--oil);
  font-size: 13px;
  letter-spacing: 0.16em;
  display: block;
  margin-bottom: 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fffdf8;
  font-size: 15px;
}
th, td {
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--steel);
  color: #f6efe3;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  font-weight: 600;
}
tr:nth-child(even) td { background: rgba(232, 224, 210, 0.35); }

.faq .qa, article.qa {
  background: #fffdf8;
  border: 1px solid var(--line);
  border-left: 4px solid var(--oil);
  margin: 0 0 12px;
  padding: 14px 16px 12px;
}
.faq .qa h3, article.qa h3 {
  margin: 0 0 8px;
  font-size: 18px;
}
.faq .qa p, article.qa p { margin: 0; }
.faq .qa .faq-body p {
  margin: 0 0 10px;
}
.faq .qa .faq-body p:last-child {
  margin-bottom: 0;
}
.faq .qa .faq-body strong,
.faq-answer strong {
  font-weight: 700;
}
.faq .qa .faq-body ul,
.faq .qa .faq-body ol,
.faq-answer ul,
.faq-answer ol {
  margin: 0 0 10px;
  padding-left: 1.3em;
}

.note {
  background: #fff7ea;
  border: 1px dashed var(--oil);
  padding: 12px 14px;
  font-size: 15px;
}
.source {
  font-size: 14px;
  color: var(--ink-soft);
}

.cta {
  display: inline-block;
  background: var(--oil);
  color: #fff !important;
  text-decoration: none;
  padding: 10px 16px;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  margin: 6px 8px 0 0;
}
.cta.ghost {
  background: transparent;
  color: var(--ink) !important;
  border: 1px solid var(--ink);
}

dl.terms dt {
  font-weight: 700;
  margin-top: 18px;
}
dl.terms dd { margin: 6px 0 0; }

.site-footer {
  background: #111c23;
  color: #d7ddd8;
  margin-top: 40px;
  padding: 36px 0 22px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}
.site-footer a { color: #f0c089; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
}
.friend-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  border-top: 1px solid #304450;
  margin-top: 22px;
  padding-top: 16px;
}
.friend-links strong {
  color: #efe7d8;
  margin-right: 4px;
}
.legal {
  border-top: 1px solid #304450;
  margin-top: 16px;
  padding-top: 14px;
  color: #9aadae;
  font-size: 12px;
}

.faq .qa .meta-line, article.qa .meta-line {
  color: var(--ink-soft);
  font-size: 0.92em;
  margin: 0 0 8px;
}

.article-body {
  overflow-wrap: anywhere;
  word-break: break-word;
}
.article-body h2 {
  font-size: 22px;
  margin: 28px 0 12px;
  line-height: 1.4;
}
.article-body h3 {
  font-size: 18px;
  margin: 22px 0 10px;
  line-height: 1.4;
}
.article-body h4 {
  font-size: 16px;
  margin: 18px 0 8px;
}
.article-body p { margin: 0 0 14px; }
.article-body ul, .article-body ol {
  margin: 0 0 14px;
  padding-left: 1.4em;
}
.article-body li { margin: 0 0 6px; }
.article-body strong { font-weight: 700; }
.article-body blockquote {
  margin: 0 0 14px;
  padding: 8px 14px;
  border-left: 4px solid var(--oil);
  background: #fff7ea;
}
.article-body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 20px 0;
}
.article-body code {
  background: #efe7d8;
  padding: 0 4px;
  border-radius: 4px;
  font-size: 0.95em;
}

@media (max-width: 860px) {
  .grid-3, .grid-2, .foot-grid { grid-template-columns: 1fr; }
  .nav-inner { flex-direction: column; align-items: flex-start; }
  body { font-size: 16px; }
  .topbar-inner { flex-direction: column; }
}