@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+KR:wght@700;800&family=Noto+Sans+KR:wght@400;700&display=swap");

:root {
  --color-bg: #F3F4F2;
  --color-ink: #2F3437;
  --color-gray: #75808A;
  --color-terra: #C46A3C;
  --color-surf: #E2E4E1;
  --font-display: "IBM Plex Sans KR", system-ui, -apple-system, "Malgun Gothic", sans-serif;
  --font-body: "Noto Sans KR", system-ui, -apple-system, "Malgun Gothic", sans-serif;
}

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
}

.site-header__logo {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--color-ink);
}
.site-header__nav a {
  font-size: 0.9rem;
  color: var(--color-ink);
}
.site-header__nav a:hover,
.site-header__nav a:focus-visible {
  text-decoration: underline;
}

.hero {
  border-bottom: 1px solid var(--color-surf);
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.5vw, 2.5rem);
}
.hero__cta {
  background: var(--color-ink);
  color: #FFFFFF;
  border-radius: 4px;
  padding: 0.85em 1.6em;
  font-weight: 700;
  width: fit-content;
}

/* ---- 슬림 사이드 인덱스 + 단일 컬럼 ---- */
.index-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
  padding-block: clamp(2rem, 5vw, 3rem);
}
.side-index {
  position: sticky;
  top: 1rem;
  border-left: 2px solid var(--color-surf);
  padding-left: 1rem;
}
.side-index ul { display: grid; gap: 0.6rem; }
.side-index a {
  font-size: 0.85rem;
  color: var(--color-gray);
}
.side-index a:hover,
.side-index a:focus-visible {
  color: var(--color-ink);
  text-decoration: underline;
}
.single-col .section {
  scroll-margin-top: 1rem;
  padding-block: clamp(1.5rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--color-surf);
}
.single-col .section:last-child { border-bottom: none; }
.single-col h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
}
@media (max-width: 800px) {
  .index-layout { grid-template-columns: 1fr; }
  .side-index { position: static; border-left: none; padding-left: 0; }
  .side-index ul { display: flex; flex-wrap: wrap; gap: 1rem; }
}

/* ---- 시그니처: 외벽-창틀 접합부 단면 도해 ---- */
.joint-diagram {
  max-width: 480px;
  margin: 1.5rem auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.joint-diagram .wall {
  background: var(--color-surf);
  border: 2px solid var(--color-gray);
  height: 120px;
}
.joint-diagram .frame {
  background: #FFFFFF;
  border: 2px solid var(--color-ink);
  height: 120px;
  position: relative;
}
.joint-diagram .seam {
  position: absolute;
  left: -3px;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--color-terra);
}
.joint-diagram .caption-row {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  margin-top: 0.5rem;
  color: var(--color-ink);
}

/* ---- 후기 ---- */
.reviews blockquote {
  background: #FFFFFF;
  border-radius: 4px;
  padding: 1.1rem;
}
.reviews cite {
  color: var(--color-ink);
  font-size: 0.85rem;
  font-weight: 700;
}

/* ---- figure ---- */
figure figcaption {
  font-size: 0.85rem;
  color: var(--color-ink);
  text-align: center;
}

/* ---- CTA ---- */
.cta-block {
  background: var(--color-ink);
  color: #FFFFFF;
}
.cta-block__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
}
.cta-block__button {
  background: #FFFFFF;
  color: var(--color-ink);
  border-radius: 4px;
  font-weight: 700;
}

/* ---- related links ---- */
.related-links__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
}
.related-links a {
  background: #FFFFFF;
  border: 1px solid var(--color-surf);
  border-radius: 4px;
  padding: 0.5em 0.9em;
  font-size: 0.9rem;
}
.related-links a:hover,
.related-links a:focus-visible {
  background: var(--color-ink);
  color: #FFFFFF;
}

/* ---- footer ---- */
.site-footer {
  background: var(--color-ink);
  color: #FFFFFF;
  font-size: 0.85rem;
}
.site-footer nav a:hover,
.site-footer nav a:focus-visible {
  text-decoration: underline;
}