:root {
  color-scheme: light;
  --blue: #0a3d78;
  --blue-dark: #061f3d;
  --orange: #f47521;
  --ink: #17283a;
  --muted: #596b7e;
  --line: #dbe4ed;
  --soft: #f3f6fa;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.8;
}

a { color: var(--blue); }

.site-head {
  color: #fff;
  background: var(--blue-dark);
  border-bottom: 4px solid var(--orange);
}

.site-head > div,
main,
.site-foot > div {
  width: min(100% - 36px, 980px);
  margin-inline: auto;
}

.site-head > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}

.site-head nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-head nav a {
  color: #c5d7ea;
  font-size: 14px;
  text-decoration: none;
}

main { padding: 54px 0 72px; }

.breadcrumb {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb a { text-decoration: none; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--orange);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
}

h1, h2, h3 { color: var(--blue-dark); line-height: 1.35; }
h1 { max-width: 850px; margin: 0; font-size: clamp(34px, 6vw, 54px); }
h2 { margin: 48px 0 16px; font-size: 26px; }
h3 { margin: 24px 0 8px; font-size: 18px; }

.lead {
  max-width: 840px;
  margin: 20px 0 0;
  color: #41576f;
  font-size: 18px;
}

.facts,
.compare,
.formula-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.facts > div,
.compare > section,
.formula-grid > div {
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.facts dt { color: var(--muted); font-size: 12px; }
.facts dd { margin: 4px 0 0; color: var(--blue-dark); font-weight: 800; }

.note,
.summary {
  margin: 28px 0;
  padding: 18px 20px;
  background: var(--soft);
  border-left: 4px solid var(--blue);
}

.warning {
  border-left-color: var(--orange);
  background: #fff7f0;
}

.formula {
  margin: 10px 0;
  padding: 15px 17px;
  overflow-wrap: anywhere;
  color: var(--blue-dark);
  background: var(--soft);
  border-left: 3px solid var(--orange);
  font-weight: 750;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  padding: 12px;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--line);
}

th { color: var(--blue-dark); background: var(--soft); }

li + li { margin-top: 6px; }

.meta {
  margin-top: 38px;
  padding-top: 16px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 12px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.cta a {
  padding: 10px 16px;
  color: #fff;
  background: var(--blue);
  text-decoration: none;
  font-weight: 750;
}

.cta a:first-child { background: var(--orange); }

.case-gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.case-gallery-grid figure {
  margin: 0;
  padding: 8px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.case-gallery-grid figure:first-child {
  grid-column: span 2;
  grid-row: span 2;
}

.case-gallery-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #eef2f6;
}

.case-gallery-grid figcaption {
  padding: 6px 3px 2px;
  color: var(--muted);
  font-size: 12px;
}

.site-foot { padding: 28px 0; color: #9fb3c8; background: var(--blue-dark); }
.site-foot p { margin: 0; font-size: 12px; }

@media (max-width: 700px) {
  .site-head > div { align-items: flex-start; flex-direction: column; padding: 16px 0; }
  .facts, .compare, .formula-grid { grid-template-columns: 1fr; }
  main { padding-top: 38px; }
  .lead { font-size: 16px; }
  table { font-size: 12px; }
  th, td { padding: 9px; }
  .case-gallery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-gallery-grid figure:first-child { grid-column: 1 / -1; grid-row: auto; }
}