/* koreasurgerystandards.com — style.css
   Plain HTML + CSS. BEM naming. Mobile first. No dark mode, no web fonts. */

:root {
  --ink:        #1c1c1c;
  --ink-soft:   #55585c;
  --ink-faint:  #7c8085;
  --rule:       #d8dade;
  --rule-soft:  #e8eaed;
  --cobalt:     #17479e;
  --cobalt-dark:#0f3378;
  --cobalt-wash:#eef2fa;
  --page:       #ffffff;
  --shell:      #f7f8f9;
  --measure:    720px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 400 17px/1.68 var(--sans);
}
img { max-width: 100%; }

a { color: var(--cobalt); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--cobalt-dark); }
a:visited { color: #5c3f8a; }

/* ---------- masthead ---------- */
.masthead { border-bottom: 1px solid var(--rule); background: var(--page); }
.masthead__inner {
  max-width: 1080px; margin: 0 auto; padding: 14px 20px;
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 16px;
}
.masthead__wordmark {
  font: 700 19px/1 var(--sans); letter-spacing: -0.2px;
  color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 8px;
}
.masthead__mark {
  display: inline-block; width: 22px; height: 22px; background: var(--cobalt);
  color: #fff; font: 700 11px/22px var(--mono); text-align: center; letter-spacing: 0.5px;
}
.masthead__tagline { color: var(--ink-soft); font-size: 14px; flex: 1 1 220px; }
.masthead__lang { font-size: 13px; font-family: var(--mono); white-space: nowrap; }
.masthead__lang a { text-decoration: none; }
.masthead__lang a:hover { text-decoration: underline; }
.masthead__lang-sep { color: var(--rule); margin: 0 6px; }
.masthead__lang--current { color: var(--ink-faint); }

/* ---------- shell ---------- */
.shell { max-width: 1080px; margin: 0 auto; padding: 0 20px 72px; }
.shell__body { padding-top: 28px; }

@media (min-width: 900px) {
  .shell { display: grid; grid-template-columns: 208px minmax(0, 1fr); gap: 40px; }
  .shell__body { max-width: var(--measure); }
}

/* ---------- category nav ---------- */
.catnav { padding-top: 28px; }
.catnav__title {
  margin: 0 0 10px; font: 700 11px/1 var(--mono);
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink-faint);
}
.catnav__list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--rule-soft); }
.catnav__item { border-bottom: 1px solid var(--rule-soft); }
.catnav__link {
  display: block; padding: 9px 0 9px 10px; font-size: 15px;
  text-decoration: none; border-left: 3px solid transparent; color: var(--ink);
}
.catnav__link:hover { text-decoration: underline; }
.catnav__link--active { border-left-color: var(--cobalt); color: var(--cobalt); font-weight: 600; }
.catnav__count { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }

@media (max-width: 899px) {
  .catnav { padding: 18px 0 0; }
  .catnav__list { display: flex; flex-wrap: wrap; gap: 6px; border: 0; }
  .catnav__item { border: 0; }
  .catnav__link { border: 1px solid var(--rule); padding: 5px 10px; font-size: 14px; }
  .catnav__link--active { border-color: var(--cobalt); background: var(--cobalt-wash); }
}

/* ---------- home ---------- */
.home__intro { margin: 0 0 30px; font-size: 17px; color: var(--ink-soft); max-width: 62ch; }
.home__section { margin: 0 0 34px; }
.home__section-head {
  margin: 0 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--ink);
  font: 600 15px/1.3 var(--sans);
}
.postlist { margin: 0; padding: 0; list-style: none; }
.postlist__item { padding: 11px 0; border-bottom: 1px solid var(--rule-soft); }
.postlist__link { font-size: 17px; font-weight: 600; }
.postlist__date { display: block; margin-top: 3px; font: 400 13px var(--mono); color: var(--ink-faint); }

/* ---------- article ---------- */
.article__title {
  margin: 6px 0 8px; font: 700 30px/1.26 var(--sans); letter-spacing: -0.4px; text-wrap: pretty;
}
.article__meta {
  margin: 0 0 22px; padding-bottom: 16px; border-bottom: 1px solid var(--rule);
  font: 400 13px var(--mono); color: var(--ink-faint);
}
.article__body > :first-child { margin-top: 0; }
.article__body h2 {
  margin: 38px 0 12px; padding-top: 4px; font: 600 21px/1.34 var(--sans); letter-spacing: -0.2px;
}
.article__body h3 { margin: 26px 0 8px; font: 600 17px/1.4 var(--sans); }
.article__body p { margin: 0 0 17px; text-wrap: pretty; }
.article__body strong { font-weight: 600; }
.article__body code { font: 400 0.9em var(--mono); background: var(--shell); padding: 1px 4px; }

/* checklist markers */
.article__body ul { margin: 0 0 18px; padding: 0; list-style: none; }
.article__body ul li { position: relative; padding-left: 26px; margin-bottom: 10px; }
.article__body ul li::before {
  content: ""; position: absolute; left: 4px; top: 0.5em;
  width: 10px; height: 5px; border-left: 2px solid var(--cobalt); border-bottom: 2px solid var(--cobalt);
  transform: rotate(-45deg);
}
.article__body ol { margin: 0 0 18px; padding-left: 24px; }
.article__body ol li { margin-bottom: 10px; }

/* ---------- table of contents ---------- */
.toc { margin: 0 0 26px; padding: 14px 16px; background: var(--shell); border: 1px solid var(--rule); }
.toc__title {
  margin: 0 0 8px; font: 700 11px/1 var(--mono);
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink-faint);
}
/* No generated ordinals: articles carry their own numbering in the heading text. */
.toc__list { margin: 0; padding: 0; list-style: none; }
.toc__item { padding: 3px 0; font-size: 15px; }
.toc__item a { text-decoration: none; }
.toc__item a:hover { text-decoration: underline; }

/* ---------- quick answer box ---------- */
.answer-box {
  margin: 0 0 26px; padding: 16px 18px;
  background: var(--cobalt-wash); border: 1px solid #c9d6ef; border-left: 4px solid var(--cobalt);
}
.answer-box > p { margin: 0; font-size: 16px; line-height: 1.62; }
.answer-box > p + p { margin-top: 10px; }
.answer-box strong { font-weight: 700; color: var(--cobalt-dark); }

/* ---------- tables ---------- */
.datatable-scroll { margin: 0 0 24px; }
.datatable {
  width: 100%; border-collapse: collapse; border: 1px solid var(--rule);
  font-size: 15px; line-height: 1.55; table-layout: fixed;
}
.datatable th, .datatable td {
  vertical-align: top; text-align: left; padding: 10px 12px; border: 1px solid var(--rule-soft);
}
.datatable thead th {
  background: var(--shell); border-bottom: 2px solid var(--ink);
  font: 600 12px/1.35 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink);
}
.datatable tbody th, .datatable tbody td:first-child { font-weight: 600; }
.datatable--cols2 td:first-child, .datatable--cols2 th:first-child { width: 34%; }
.datatable--cols3 td:first-child, .datatable--cols3 th:first-child { width: 24%; }
.datatable--cols4 td:first-child, .datatable--cols4 th:first-child { width: 22%; }
.datatable strong { font-weight: 700; }

@media (max-width: 640px) {
  .datatable { font-size: 14px; }
  .datatable th, .datatable td { padding: 9px 10px; }
  /* 2- and 3-column tables grow vertically by wrapping; only 4-column falls back to scroll */
  .datatable--cols4-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-right: 1px solid var(--rule); }
  .datatable--cols4 { min-width: 620px; }
}

/* ---------- FAQ ---------- */
.faq { margin: 34px 0 0; padding-top: 22px; border-top: 1px solid var(--rule); }
.faq__title { margin: 0 0 16px; font: 600 21px/1.3 var(--sans); letter-spacing: -0.2px; }
.faq__item { margin: 0 0 20px; }
.faq__q { margin: 0 0 5px; font: 600 16px/1.5 var(--sans); }
.faq__a { margin: 0; color: var(--ink-soft); }

/* ---------- related ---------- */
.related { margin: 40px 0 0; padding-top: 22px; border-top: 1px solid var(--rule); }
.related__title {
  margin: 0 0 14px; font: 700 11px/1 var(--mono);
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink-faint);
}
.related__grid { display: grid; gap: 12px; }
@media (min-width: 620px) { .related__grid { grid-template-columns: 1fr 1fr; } }
.related__card { border: 1px solid var(--rule); padding: 14px 15px; background: var(--page); }
.related__card-title { margin: 0 0 5px; font: 600 16px/1.4 var(--sans); }
.related__card-summary { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-soft); }

/* ---------- static pages ---------- */
.page__title { margin: 6px 0 18px; font: 700 26px/1.3 var(--sans); letter-spacing: -0.3px; }
.page__body p { margin: 0 0 16px; }
.error__code { margin: 0; font: 700 44px/1 var(--mono); color: var(--cobalt); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--rule); background: var(--shell); }
.footer__inner {
  max-width: 1080px; margin: 0 auto; padding: 20px;
  display: flex; flex-wrap: wrap; gap: 8px 18px;
  font-size: 13px; color: var(--ink-faint);
}
.footer__links { display: flex; flex-wrap: wrap; gap: 14px; }