:root {
  --ink: #141414;
  --muted: #5a5a5a;
  --paper: #f3f2f0;
  --white: #fff;
  --line: #e4e2df;
  --navy: #0e0e0e;
  --brand: #dc1f26;
  --brand-deep: #a8161c;
  --brand-soft: #f2a0a3;
  --copper: #dc1f26;
  --copper-2: #a8161c;
}
::selection { background: var(--brand); color: #fff; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}
a { color: var(--copper-2); }
a:hover { color: var(--copper); }
.skip {
  position: absolute; left: -999px; top: 0;
}
.skip:focus { left: 8px; top: 8px; background: #fff; padding: 8px; z-index: 9; }
.wrap { width: min(1080px, calc(100% - 36px)); margin: 0 auto; }
.topbar {
  background: var(--navy);
  color: #cfcfcf;
  font-size: 13px;
  padding: 8px 0;
}
.topbar .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: center; }
.topbar a { color: #fff; text-decoration: none; }
.langs { display: flex; gap: 6px; align-items: center; flex-wrap: nowrap; }
.langs a {
  color: #cfcfcf;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border: 1px solid #3a3a3a;
  border-radius: 999px;
  text-decoration: none;
  white-space: nowrap;
}
.langs a:hover, .langs a.on { color: #fff; background: var(--brand); border-color: var(--brand); }
.lang-sep { color: #777; font-weight: 700; padding: 0 2px; user-select: none; }
html[lang="zh-CN"] body { font-family: "Noto Sans SC", "IBM Plex Sans", "Segoe UI", sans-serif; }
.nav-cta {
  background: var(--copper); color: #fff !important; padding: 6px 12px; border-radius: 3px;
}
.nav-cta:hover { background: var(--copper-2); color: #fff !important; }
.prose dt { font-weight: 700; margin: 16px 0 4px; }
.prose dd { margin: 0 0 8px; color: #2a3540; }
header.site {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 var(--brand);
  position: sticky;
  top: 0;
  z-index: 20;
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 12px 0;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: inherit; flex-shrink: 0;
}
.brand:hover { color: inherit; opacity: 0.92; }
.brand-mark { display: block; width: 44px; height: 44px; }
.brand-text { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.brand-name {
  font-size: 20px; font-weight: 700; letter-spacing: 0.14em;
  line-height: 1; color: var(--brand);
}
.brand-sub {
  font-size: 10px; font-weight: 600; letter-spacing: 0.05em;
  color: var(--muted); line-height: 1.2;
  padding-top: 5px; border-top: 2px solid var(--brand);
}
.brand-foot { margin: 0 0 16px; }
.brand-foot .brand-name { color: #fff; }
.brand-foot .brand-sub { color: #c8c8c8; border-top-color: var(--brand); }
.foot-legal-name { margin: 0; }
.menu { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.menu a, .menu span { text-decoration: none; color: var(--ink); font-weight: 500; font-size: 15px; }
.menu a.on, .menu span.on { color: var(--copper); }
.drop { position: relative; }
.drop > span, .drop > a { cursor: pointer; }
.drop:hover .sub, .drop:focus-within .sub { display: block; }
.sub {
  display: none; position: absolute; top: 100%; left: 0; min-width: 220px;
  background: #fff; border: 1px solid var(--line); padding: 8px 0; z-index: 5;
}
.sub a { display: block; padding: 8px 14px; }
.nav-toggle, .nav-btn { display: none; }
.hero {
  background:
    linear-gradient(180deg, rgba(220, 31, 38, 0.14) 0%, transparent 40%),
    var(--navy);
  color: #ededed;
  padding: 52px 0 44px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -24px; top: 50%;
  width: 300px; height: 300px;
  transform: translateY(-50%);
  background: url("logo-mark-on-dark.svg") center / contain no-repeat;
  opacity: 0.09;
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { color: #fff; font-size: 32px; line-height: 1.25; margin: 0 0 14px; font-weight: 600; }
.hero .lead { max-width: 760px; color: #c8c8c8; margin: 0 0 20px; }
.hero a { color: #ffb3b6; }
.kicker { letter-spacing: 0.14em; text-transform: uppercase; font-size: 12px; color: #f2a0a3; margin: 0 0 10px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 16px; border-radius: 2px;
  text-decoration: none; font-weight: 600; border: 1px solid transparent;
  cursor: pointer; font-family: inherit; font-size: 15px;
  letter-spacing: 0.01em;
}
.btn-primary { background: var(--copper); color: #fff; }
.btn-primary:hover { background: var(--copper-2); color: #fff; }
.btn-ghost { border-color: #8a8a8a; color: #fff; }
.btn-ghost:hover { color: #fff; border-color: #fff; }
.btn-on-light { background: var(--copper); color: #fff; }
.btn-on-light:hover { color: #fff; background: var(--copper-2); }
section { padding: 40px 0; }
section.alt { background: #fff; }
h2 { font-size: 22px; margin: 0 0 12px; }
h3 { font-size: 17px; margin: 22px 0 8px; }
.subhead { color: var(--muted); margin: -4px 0 22px; max-width: 720px; }
.grid-3, .grid-2 { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: 1fr 1fr; }
.card {
  background: #fff; border: 1px solid var(--line); padding: 18px 16px;
  text-decoration: none; color: inherit; display: block; height: 100%;
  border-top: 2px solid transparent;
  transition: border-top-color 0.15s ease, box-shadow 0.15s ease;
}
a.card:hover {
  border-color: var(--line); border-top-color: var(--brand);
  box-shadow: 0 10px 24px rgba(20, 20, 20, 0.05);
}
.card .mark { font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--copper); font-weight: 700; }
.card h3 { margin: 6px 0 8px; }
.card p { margin: 0; color: var(--muted); }
.prose { max-width: 820px; }
.prose.wide { max-width: 920px; }
.prose p, .prose li { color: #2a3540; }
.hero.note { padding: 40px 0 32px; }
.hero.note h1 { font-size: 30px; max-width: 22em; }
.hero.note .lead { font-size: 17px; line-height: 1.55; max-width: 38rem; color: #d0d0d0; }
.reading { background: #fafafa; }
.prose.article {
  max-width: 40rem;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 18px;
  line-height: 1.75;
}
.prose.article h2, .prose.article h3 {
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  letter-spacing: -0.01em;
}
.prose.article h2 { font-size: 20px; margin: 2em 0 0.7em; }
.prose.article h3 { font-size: 16px; margin: 1.6em 0 0.5em; }
.prose.article p { margin: 0 0 1.15em; }
.prose.article ul, .prose.article ol { margin: 0 0 1.2em; padding-left: 1.25em; }
.prose.article li { margin: 0.35em 0; }
.prose.article .article-cta { margin-top: 2.2em; }
html[lang="zh-CN"] .prose.article {
  font-family: "Noto Sans SC", "IBM Plex Sans", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.85;
}
.know-group { margin: 0 0 42px; }
.know-group h2 {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--copper);
  margin: 0 0 14px;
  font-weight: 600;
}
.know-group .card { min-height: 148px; }
.crumbs { font-size: 13px; padding: 14px 0 0; color: var(--muted); }
.crumbs a { color: var(--muted); }
.crumbs .sep { margin: 0 8px; }
footer.site {
  background: var(--navy); color: #c8c8c8; padding: 40px 0 24px; font-size: 14px;
  border-top: 3px solid var(--brand);
}
footer.site a { color: #ffb3b6; }
footer.site h3 { color: #fff; margin: 0 0 10px; font-size: 14px; }
footer .grid-4 { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 20px; }
footer ul { list-style: none; padding: 0; margin: 0; }
footer li { margin: 6px 0; }
.brief label { display: block; margin: 12px 0 4px; font-weight: 600; }
.brief input, .brief select, .brief textarea {
  width: 100%; padding: 9px 10px; border: 1px solid var(--line); background: #fff;
  font: inherit;
}
.brief textarea { min-height: 120px; }
.note { font-size: 13px; color: var(--muted); border-left: 3px solid var(--copper); padding: 8px 12px; }
.faq details { background: #fff; border: 1px solid var(--line); padding: 10px 14px; margin: 8px 0; }
.faq summary { font-weight: 600; cursor: pointer; }
.lines {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0 8px;
}
.line {
  background: #fff;
  border: 1px solid var(--line);
  padding: 14px 16px;
}
.line h3 { margin: 0 0 6px; font-size: 15px; }
.line p { margin: 0; font-size: 14px; color: var(--muted); }
.svc-grid { margin: 18px 0 28px; }
@media (max-width: 800px) {
  .lines { grid-template-columns: 1fr; }
}
.legal { font-size: 13px; color: #9a9a9a; margin-top: 22px; }
.brief .actions { margin-top: 14px; }
@media (max-width: 800px) {
  .grid-3, .grid-2, footer .grid-4 { grid-template-columns: 1fr; }
  .nav-btn {
    display: inline-block; padding: 8px 12px; border: 1px solid var(--line);
    background: #fff; cursor: pointer; margin-left: auto;
  }
  .nav-toggle { position: absolute; width: 1px; height: 1px; opacity: 0; }
  .menu { display: none; width: 100%; flex-direction: column; align-items: flex-start; padding: 8px 0 14px; }
  .nav-toggle:checked ~ .menu { display: flex; }
  .drop .sub {
    display: block; position: static; border: 0; padding: 4px 0 4px 12px; min-width: 0;
  }
  header.site .wrap { flex-wrap: wrap; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-name { font-size: 17px; letter-spacing: 0.12em; }
  .brand-sub { display: none; }
  .hero { padding: 32px 0 28px; }
  .hero h1 { font-size: 26px; }
}