/* 바닥코팅내약품성 — 네이비/에메랄드, 기술 스펙시트 그리드 + 코너 브래킷 버튼 */

:root {
  --primary: #1D3557;
  --primary-dark: #122238;
  --accent: #06D6A0;
  --ink: #16232F;
  --paper: #F4F7F6;
  --card-bg: #FFFFFF;
  --line: #D6E0DC;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Noto Sans KR", -apple-system, "Malgun Gothic", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2 {
  font-family: "Kirang Haerang", "Noto Sans KR", sans-serif;
  font-weight: 400;
  letter-spacing: 0.01em;
}

a { color: inherit; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.section-inner { max-width: 1120px; margin: 0 auto; padding: 56px 20px; }

/* ---------- 헤더 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--primary-dark);
  border-bottom: 2px solid var(--accent);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  color: #fff;
  font-family: "Kirang Haerang", sans-serif;
  font-size: 1.15rem;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.menu-toggle {
  width: 44px; height: 44px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--accent);
  cursor: pointer;
}
.menu-toggle span { width: 20px; height: 2px; background: var(--accent); display: block; }

#primary-nav {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}
#primary-nav.is-open { display: flex; }
#primary-nav a {
  color: #fff;
  text-decoration: none;
  padding: 12px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  min-height: 44px;
  display: flex;
  align-items: center;
  font-size: 0.95rem;
}

@media (min-width: 768px) {
  .menu-toggle { display: none; }
  #primary-nav {
    display: flex;
    flex-direction: row;
    width: auto;
    gap: 24px;
  }
  #primary-nav a { border-bottom: none; padding: 8px 0; }
}

/* ---------- 버튼: 코너 브래킷 (기술 UI) ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 30px;
  font-size: 1rem;
  text-decoration: none;
  border: 1px solid currentColor;
  border-radius: 0;
  cursor: pointer;
  background: transparent;
  margin: 3px;
}
.btn-primary { color: var(--accent); border-color: var(--accent); }
.btn-primary .corner { border-color: var(--accent); }
.btn-ghost { color: #fff; border-color: rgba(255,255,255,0.5); }
.btn-ghost .corner { border-color: #fff; }

.corner {
  position: absolute;
  width: 10px; height: 10px;
  border-style: solid;
  border-width: 0;
}
.corner.tl { top: -4px; left: -4px; border-top-width: 2px; border-left-width: 2px; }
.corner.tr { top: -4px; right: -4px; border-top-width: 2px; border-right-width: 2px; }
.corner.bl { bottom: -4px; left: -4px; border-bottom-width: 2px; border-left-width: 2px; }
.corner.br { bottom: -4px; right: -4px; border-bottom-width: 2px; border-right-width: 2px; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }

/* ---------- 히어로: 블루프린트 그리드 배경 ---------- */
.hero {
  position: relative;
  background: var(--primary-dark);
  background-image:
    linear-gradient(rgba(6,214,160,0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6,214,160,0.09) 1px, transparent 1px);
  background-size: 28px 28px;
  padding: 56px 0 40px;
}
.hero-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
  color: #fff;
}
.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 5px 12px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 2.2rem;
  margin: 0 0 18px;
  color: #fff;
}
.hero-sub { font-size: 1.02rem; max-width: 58ch; color: #C9D6E4; }

/* 스펙 라벨 박스 */
.spec-box {
  max-width: 780px;
  margin: 40px auto 0;
  padding: 20px 20px 8px;
  border: 1px solid var(--accent);
  background: rgba(6,214,160,0.05);
}
.spec-box-title {
  margin: 0 0 14px;
  font-family: "Kirang Haerang", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.spec-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  padding: 10px 0;
  border-top: 1px dashed rgba(6,214,160,0.35);
  font-size: 0.92rem;
}
.spec-row:first-of-type { border-top: none; }
.spec-key {
  flex: 0 0 auto;
  min-width: 130px;
  color: var(--accent);
  letter-spacing: 0.04em;
  font-size: 0.78rem;
}
.spec-val { color: #E7EEF4; }

@media (min-width: 768px) {
  .hero { padding: 84px 0 60px; }
  .hero h1 { font-size: 3rem; }
  .spec-box { padding: 26px 28px 12px; }
}

/* ---------- 업종 스펙 카드 그리드 ---------- */
.industry-section { background: var(--paper); }
.industry-section h2 { font-size: 1.6rem; color: var(--primary); margin-bottom: 10px; }
.lead { max-width: 68ch; color: #3B4A55; margin-bottom: 32px; }

.industry-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.industry-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-top: 3px solid var(--primary);
  padding: 22px 20px;
}
.spec-tag {
  display: inline-block;
  font-family: "Kirang Haerang", sans-serif;
  font-size: 0.85rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 2px 10px;
  margin-bottom: 12px;
}
.industry-card h3 { font-size: 1.1rem; color: var(--primary); margin: 0 0 10px; }
.industry-card p { margin: 0; font-size: 0.98rem; }
.industry-card a { color: var(--primary); text-decoration: underline; }

@media (min-width: 480px) {
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .industry-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- 스플릿 섹션 ---------- */
.split-section { background: #fff; border-top: 1px solid var(--line); }
.split-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 20px;
  display: grid;
  gap: 32px;
}
.split-text h2 { font-size: 1.5rem; color: var(--primary); margin-bottom: 16px; }
.split-text p { margin: 0 0 16px; }
.split-text a { color: var(--primary); text-decoration: underline; }

.chem-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: center;
  padding: 20px;
  background: var(--primary-dark);
  border: 1px solid var(--accent);
  min-height: 140px;
}
.chem-tags .tag {
  font-family: "Kirang Haerang", sans-serif;
  font-size: 0.85rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 14px;
}
.chem-tags .tag.alt { background: var(--accent); color: var(--primary-dark); border-color: var(--accent); }

.split-visual {
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.warn-mark {
  font-family: "Kirang Haerang", sans-serif;
  font-size: 3.4rem;
  color: var(--primary-dark);
  border: 3px solid var(--primary);
  width: 90px; height: 90px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(6,214,160,0.12);
}

.split-section.reverse { background: var(--paper); }

@media (min-width: 768px) {
  .split-inner { grid-template-columns: 1.3fr 1fr; align-items: center; }
  .split-section.reverse .split-inner { grid-template-columns: 1fr 1.3fr; }
  .split-section.reverse .split-visual { order: -1; }
}

/* ---------- 노출 조건 스펙 카드 ---------- */
.exposure-section { background: #fff; border-top: 1px solid var(--line); }
.exposure-section h2 { font-size: 1.6rem; color: var(--primary); margin-bottom: 10px; }
.exposure-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin-top: 24px; }
.exposure-card {
  border: 1px solid var(--primary);
  padding: 22px 20px;
  background: var(--paper);
}
.exposure-card .spec-box-title { color: var(--primary); }
.exposure-card h3 { font-size: 1.15rem; color: var(--primary); margin: 0 0 14px; }
.exposure-card .spec-row { border-top: 1px dashed var(--line); }
.exposure-card .spec-row:first-of-type { border-top: none; }
.exposure-card .spec-key { color: var(--primary); }
.exposure-card .spec-val { color: var(--ink); }
.exposure-card p:last-child { margin: 14px 0 0; font-size: 0.96rem; }

@media (min-width: 768px) {
  .exposure-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- FAQ 아코디언 ---------- */
.faq-section { background: var(--paper); border-top: 1px solid var(--line); }
.faq-section h2 { font-size: 1.6rem; color: var(--primary); margin-bottom: 24px; }
.accordion-item { border: 1px solid var(--line); background: #fff; margin-bottom: 12px; }
.accordion-item h3 { margin: 0; }
.accordion-trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-family: "Kirang Haerang", sans-serif;
  font-size: 1rem;
  color: var(--primary);
  padding: 18px 20px;
  min-height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.accordion-trigger::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--accent);
  flex-shrink: 0;
}
.accordion-trigger[aria-expanded="true"]::after { content: "\2212"; }
.accordion-panel { padding: 0 20px 20px; }
.accordion-panel p { margin: 0; }

/* ---------- CTA ---------- */
.cta-section {
  background: var(--primary-dark);
  color: #fff;
  border-top: 3px solid var(--accent);
}
.cta-inner { text-align: center; }
.cta-section h2 { font-size: 1.6rem; margin-bottom: 12px; color: #fff; }
.cta-section p { color: #C9D6E4; margin: 0 auto 8px; max-width: 52ch; }
.cta-section .hero-cta { justify-content: center; }

/* ---------- 푸터 ---------- */
.site-footer {
  background: var(--ink);
  color: #CBD6DD;
  padding: 44px 20px 28px;
}
.footer-nav {
  max-width: 1120px;
  margin: 0 auto 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
}
.footer-nav a {
  color: #CBD6DD;
  text-decoration: none;
  font-size: 0.92rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.footer-nav a:hover { color: var(--accent); }
.site-footer address { max-width: 1120px; margin: 0 auto 16px; font-style: normal; font-size: 0.9rem; line-height: 1.8; }
.site-footer address a { color: var(--accent); text-decoration: none; }
.site-footer p { max-width: 1120px; margin: 0 auto; font-size: 0.82rem; color: #8FA0AA; }

@media (min-width: 1024px) {
  .hero h1 { font-size: 3.3rem; }
}

@media (min-width: 1280px) {
  .section-inner, .split-inner { padding-left: 0; padding-right: 0; }
}

/* 현장 사진 */
.site-photo-section { max-width: 1000px; margin: 0 auto; padding: 40px 20px; }
.site-photo-section h2 { color: var(--primary); margin: 0 0 18px; }
.site-photo-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.site-photo-grid picture { display: block; aspect-ratio: 4/3; overflow: hidden; }
.site-photo-grid img { width: 100%; height: 100%; object-fit: cover; }
@media (min-width: 640px) { .site-photo-grid { grid-template-columns: repeat(2, 1fr); } }