:root {
  --navy: #071b3b;
  --blue: #168dcc;
  --sky: #eaf7fd;
  --ink: #132238;
  --muted: #607086;
  --line: #dce6ef;
  --surface: #f5f8fb;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); font-family: Arial, "Malgun Gothic", sans-serif; line-height: 1.7; }
img { display: block; max-width: 100%; }
img { -webkit-user-drag: none; user-select: none; -webkit-touch-callout: none; }
a { color: inherit; text-decoration: none; }

.page-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px; padding: 0 max(22px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96);
}
.page-brand { display: flex; align-items: center; gap: 10px; font-size: 23px; font-weight: 900; }
.page-brand img { width: 50px; height: 50px; object-fit: contain; }
.page-brand small { margin-left: 5px; padding-left: 14px; border-left: 1px solid #cbd7e1; color: #5d7184; font-size: 24px; font-weight: 700; white-space: nowrap; }
.page-nav { display: flex; gap: 8px; font-size: 13px; font-weight: 800; }
.page-nav a { padding: 9px 11px; border-radius: 7px; }
.page-nav a:hover { color: var(--blue); background: var(--sky); }
.page-nav .contact-link { color: #fff; background: var(--navy); }

.breadcrumb { max-width: 1120px; margin: 0 auto; padding: 22px 22px 0; color: var(--muted); font-size: 12px; }
.breadcrumb a { color: var(--blue); }
.article-hero {
  display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center;
  max-width: 1164px; margin: 0 auto; padding: 58px 22px 76px;
}
.eyebrow { margin: 0 0 10px; color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.article-hero h1 { margin: 0; font-size: clamp(37px, 4.5vw, 58px); line-height: 1.14; letter-spacing: -.05em; }
.article-hero .lead { margin: 22px 0 0; color: var(--muted); font-size: 18px; }
.article-hero img { width: 100%; border-radius: 18px; box-shadow: 0 22px 55px rgba(7,27,59,.14); }

.quick-answer { background: var(--navy); color: #fff; }
.quick-answer-inner { max-width: 1120px; margin: 0 auto; padding: 42px 22px; }
.quick-answer h2 { margin: 0 0 10px; font-size: 25px; }
.quick-answer p { max-width: 900px; margin: 0; color: #c8d8e7; }

.article { max-width: 1120px; margin: 0 auto; padding: 82px 22px; }
.article section + section { margin-top: 78px; }
.article h2 { margin: 0 0 18px; font-size: clamp(28px, 3.2vw, 40px); line-height: 1.25; letter-spacing: -.035em; }
.article h3 { margin: 0 0 8px; }
.article p { color: #44566a; }
.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.info-card { padding: 25px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.info-card p { margin: 0; font-size: 14px; }
.term-list { display: grid; grid-template-columns: 190px 1fr; border-top: 1px solid var(--line); }
.term-list dt,.term-list dd { margin: 0; padding: 16px; border-bottom: 1px solid var(--line); }
.term-list dt { font-weight: 900; background: var(--sky); }
.term-list dd { color: #44566a; }
.spec-table-wrap { overflow-x: auto; margin-top: 25px; border: 1px solid var(--line); border-radius: 12px; }
.spec-table { width: 100%; min-width: 820px; border-collapse: collapse; font-size: 13px; }
.spec-table th,.spec-table td { padding: 13px; border-bottom: 1px solid var(--line); text-align: center; }
.spec-table thead th { color: #fff; background: var(--navy); }
.spec-table tbody th { text-align: left; background: var(--sky); }
.diagram { margin-top: 28px; padding: 28px; border-radius: 14px; background: var(--surface); }
.diagram-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; gap: 10px; align-items: center; }
.diagram-flow div { padding: 18px 12px; border: 1px solid #cfe6f1; border-radius: 9px; background: #fff; text-align: center; }
.diagram-flow strong,.diagram-flow span { display: block; }
.diagram-flow span { color: var(--muted); font-size: 11px; }
.diagram-flow b { color: var(--blue); }
.note { margin-top: 18px; padding: 18px 20px; border-left: 4px solid var(--blue); background: var(--sky); color: #36536b; }
.check-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.check-list li { padding: 14px 17px 14px 44px; border: 1px solid var(--line); border-radius: 8px; background: #fff; position: relative; }
.check-list li::before { position: absolute; left: 17px; color: var(--blue); content: "✓"; font-weight: 900; }

.related { background: var(--surface); }
.related-inner { max-width: 1120px; margin: 0 auto; padding: 68px 22px; }
.related h2 { margin: 0 0 22px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.related-card { padding: 22px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.related-card strong { display: block; margin-bottom: 7px; }
.related-card span { color: var(--muted); font-size: 13px; }
.article-cta { padding: 70px 22px; color: #fff; text-align: center; background: linear-gradient(135deg,#071b3b,#0b3768); }
.article-cta h2 { margin: 0 0 10px; font-size: 34px; }
.article-cta p { margin: 0 0 22px; color: #c0d2e2; }
.article-cta a { display: inline-block; padding: 13px 22px; border-radius: 7px; background: var(--blue); font-weight: 900; }
.page-footer { display: flex; justify-content: space-between; padding: 25px max(22px,calc((100vw - 1120px)/2)); color: #91a1b1; background: #041226; font-size: 12px; }

@media (max-width: 820px) {
  .page-nav a:not(.contact-link) { display: none; }
  .article-hero { grid-template-columns: 1fr; }
  .info-grid,.related-grid { grid-template-columns: 1fr; }
  .diagram-flow { grid-template-columns: 1fr; }
  .diagram-flow b { transform: rotate(90deg); text-align: center; }
}
@media (max-width: 560px) {
  .page-brand small { display: none; }
  .article-hero { padding-top: 40px; }
  .article-hero h1 { font-size: 37px; }
  .term-list { grid-template-columns: 1fr; }
  .term-list dd { padding-top: 6px; }
  .page-footer { flex-direction: column; gap: 5px; }
}