/* =====================================================================
   삼우E.N.G 웹사이트 스타일시트 — 2026 리디자인
   정밀가공 제조기업에 맞춘 톤: 딥 네이비 + 스틸 그레이 + 웜 코퍼 포인트
   ===================================================================== */

:root {
  --nav-height: 4.5rem;

  /* 브랜드 컬러 (로고의 딥 인디고 기반) */
  --c-ink:        #0E1330;
  --c-navy:       #1D2B6B;
  --c-navy-deep:  #10173F;
  --c-steel:      #5B6478;
  --c-steel-light:#8A93A6;
  --c-mist:       #F2F3F6;
  --c-mist-deep:  #E8E9EF;
  --c-line:       #DFE1E8;
  --c-paper:      #FFFFFF;
  --c-copper:     #D97B29;
  --c-copper-deep:#B8621C;

  --font-display: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-display);
  color: var(--c-ink);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  letter-spacing: -0.01em;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

/* =====================================================================
   섹션 표시/숨김 (JS의 showSection 이 토글)
   ===================================================================== */
.hidden-section { display: none !important; }

.dropdown-hidden { opacity: 0 !important; visibility: hidden !important; }

@media (max-width: 768px) {
  .group:hover .group-hover\:opacity-100 { opacity: 0; }
  .group:hover .group-hover\:visible { visibility: hidden; }
}

.rotate-180 { transform: rotate(180deg); }

/* =====================================================================
   타이포그래피 유틸
   ===================================================================== */
.font-mono { font-family: var(--font-mono); }

.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-copper-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.kicker::before {
  content: '';
  width: 1.5rem;
  height: 1px;
  background: var(--c-copper);
  display: inline-block;
}

.section-head { max-width: 46rem; margin-bottom: 2.5rem; }
.section-head h2 {
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  margin: 0.5rem 0 0.75rem;
}
.section-head p {
  color: var(--c-steel);
  font-size: 1.0625rem;
  line-height: 1.6;
}

/* =====================================================================
   헤더 / 내비게이션
   ===================================================================== */
.site-header {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}
.site-header.is-scrolled {
  border-bottom-color: var(--c-line);
  background: rgba(255, 255, 255, 0.92);
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-ink);
  position: relative;
  padding: 0.5rem 0.25rem;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0.25rem; right: 0.25rem; bottom: 0.15rem;
  height: 2px;
  background: var(--c-copper);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav-link:hover::after,
.group:hover .nav-link::after { transform: scaleX(1); }

.dropdown-panel {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  box-shadow: 0 16px 40px -12px rgba(16, 23, 63, 0.18);
}
.dropdown-panel a { font-size: 0.9rem; color: var(--c-steel); }
.dropdown-panel a:hover { color: var(--c-navy); background: var(--c-mist); }

.btn-cta {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
  background: var(--c-navy);
  padding: 0.65rem 1.35rem;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.btn-cta:hover { background: var(--c-copper-deep); }

.btn-outline {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--c-ink);
  border: 1px solid var(--c-line);
  padding: 0.65rem 1.35rem;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.btn-outline:hover { border-color: var(--c-navy); color: var(--c-navy); }

/* =====================================================================
   히어로 슬라이더
   ===================================================================== */
.slider-hero-height { min-height: calc(100vh - var(--nav-height)); }

.slide-container { position: relative; width: 100%; height: 100%; }

.slide {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  opacity: 0;
  transition: opacity 1.1s ease-in-out;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  min-height: calc(100vh - var(--nav-height));
}
.slide.active { opacity: 1; }

.slide-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(14,19,48,0.86) 0%, rgba(14,19,48,0.55) 45%, rgba(14,19,48,0.25) 100%);
  display: flex;
  align-items: flex-end;
  z-index: 10;
}

.slide-content {
  text-align: left;
  color: #fff;
  padding: 0 1.5rem 4.5rem;
  max-width: 64rem;
  width: 100%;
  margin: 0 auto;
}
@media (min-width: 1024px) { .slide-content { padding: 0 2rem 6rem; } }

.slide-content .kicker { color: var(--c-copper); margin-bottom: 1rem; }
.slide-content .kicker::before { background: var(--c-copper); }

.slide-content h1, .slide-content h2 {
  color: #fff !important;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  text-shadow: none;
}
.slide-content p {
  color: #E8EAF2 !important;
  text-shadow: none;
  max-width: 34rem;
}

.hero-meta {
  border-top: 1px solid rgba(255,255,255,0.22);
  margin-top: 2rem;
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #C7CCDE;
}
.hero-meta strong { color: #fff; font-weight: 600; display: block; font-size: 0.95rem; margin-bottom: 0.15rem; font-family: var(--font-display); }

.indicator { cursor: pointer; transition: opacity 0.3s ease, width 0.3s ease; }
.indicator.active { opacity: 1 !important; }
.indicator:hover { opacity: 0.85; }

.scroll-cue {
  position: absolute;
  right: 1.5rem;
  bottom: 1.75rem;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  writing-mode: vertical-rl;
}
.scroll-cue .line { width: 1px; height: 2.5rem; background: rgba(255,255,255,0.5); position: relative; overflow: hidden; }
.scroll-cue .line::after {
  content: '';
  position: absolute; left: 0; top: -100%; width: 100%; height: 100%;
  background: #fff;
  animation: scrollcue 1.8s ease-in-out infinite;
}
@keyframes scrollcue { 0% { top: -100%; } 60% { top: 100%; } 100% { top: 100%; } }

/* =====================================================================
   핵심역량 스트립
   ===================================================================== */
.stat-strip {
  background: var(--c-navy);
  color: #fff;
}
.stat-item { border-left: 1px solid rgba(255,255,255,0.16); padding: 0 0 0 1.5rem; }
.stat-item:first-child { border-left: none; padding-left: 0; }
.stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  font-weight: 600;
  color: #fff;
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
}
.stat-num .unit { font-size: 1.1rem; color: var(--c-copper); margin-left: 0.15rem; }
.stat-label { color: #B7BEDA; font-size: 0.9rem; line-height: 1.5; }

/* =====================================================================
   빠른 링크 카드 (오시는 길 / 갤러리)
   ===================================================================== */
.quick-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-paper);
  transition: border-color 0.25s ease;
}
.quick-card:hover { border-color: var(--c-navy); }
.quick-card .quick-card-top {
  padding: 2.25rem 2rem 1.5rem;
}
.quick-card .quick-card-num {
  font-family: var(--font-mono);
  color: var(--c-copper-deep);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
  display: block;
}
.quick-card h3 { font-size: 1.4rem; font-weight: 800; margin: 0 0 0.5rem; color: var(--c-ink); }
.quick-card p { color: var(--c-steel); font-size: 0.95rem; }
.quick-card .quick-card-cta {
  border-top: 1px solid var(--c-line);
  padding: 1rem 2rem;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--c-navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.quick-card:hover .quick-card-cta { color: var(--c-copper-deep); }

/* =====================================================================
   기업정보 테이블
   ===================================================================== */
.info-panel {
  border: 1px solid var(--c-line);
  background: var(--c-paper);
}
.company-info-table { width: 100%; }
.info-row {
  display: flex; align-items: baseline;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--c-line);
}
.info-row:last-child { border-bottom: none; }
.info-label {
  flex: 0 0 130px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-steel);
  letter-spacing: 0.02em;
}
.info-value { flex: 1; color: var(--c-ink); font-size: 1rem; font-weight: 500; line-height: 1.55; }

@media (max-width: 640px) {
  .info-row { flex-direction: column; align-items: flex-start; padding: 0.85rem 0; gap: 0.25rem; }
  .info-label { flex: none; }
}
@media (min-width: 641px) and (max-width: 768px) {
  .info-label { flex: 0 0 108px; }
}

/* =====================================================================
   인사말
   ===================================================================== */
.ceo-portrait-frame {
  position: relative;
  padding: 1rem;
}
.ceo-portrait-frame::before {
  content: '';
  position: absolute; inset: 0;
  border: 1px solid var(--c-copper);
  transform: translate(10px, 10px);
  z-index: 0;
}
.ceo-portrait-frame img { position: relative; z-index: 1; }

.ceo-letter { color: var(--c-steel); line-height: 1.85; }
.ceo-letter strong { color: var(--c-ink); font-weight: 700; }
.ceo-letter .lede { font-size: 1.15rem; color: var(--c-ink); font-weight: 600; line-height: 1.6; }

/* =====================================================================
   연혁 타임라인
   ===================================================================== */
.timeline { position: relative; padding-left: 2.25rem; }
.timeline::before {
  content: '';
  position: absolute; left: 5px; top: 0.4rem; bottom: 0.4rem;
  width: 1px; background: var(--c-line);
}
.timeline-node { position: relative; padding-bottom: 2.5rem; }
.timeline-node:last-child { padding-bottom: 0; }
.timeline-node::before {
  content: '';
  position: absolute; left: -2.25rem; top: 0.35rem;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--c-navy);
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--c-navy);
}
.timeline-node.is-open::before {
  background: #fff;
  box-shadow: 0 0 0 1px var(--c-line);
  border: 2px dashed var(--c-mist-deep);
}
.timeline-year { font-family: var(--font-mono); font-weight: 600; color: var(--c-navy); font-size: 1.05rem; }
.timeline-node.is-open .timeline-year { color: var(--c-steel-light); }
.timeline-desc { color: var(--c-steel); margin-top: 0.35rem; line-height: 1.6; }

/* =====================================================================
   준비중 플레이스홀더 (보도자료 등)
   ===================================================================== */
.placeholder-panel {
  border: 1px dashed var(--c-line);
  background: var(--c-mist);
  padding: 3rem 2rem;
  text-align: left;
}
.placeholder-panel .kicker { color: var(--c-steel-light); }
.placeholder-panel .kicker::before { background: var(--c-steel-light); }
.placeholder-panel h3 { font-size: 1.25rem; font-weight: 700; color: var(--c-ink); margin: 0.75rem 0 0.5rem; }
.placeholder-panel p { color: var(--c-steel); font-size: 0.95rem; }

/* =====================================================================
   제품 / 공정 슬라이더
   ===================================================================== */
.showcase-frame {
  position: relative;
  background: var(--c-mist);
  border: 1px solid var(--c-line);
}
.product-slide, .process-slide {
  opacity: 0;
  transform: translateX(300%) scale(0.7);
  z-index: 0;
}
.product-slide img, .process-slide img {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 2px;
  box-shadow: 0 24px 48px -20px rgba(16, 23, 63, 0.25);
}

.showcase-nav-btn {
  background: #fff;
  border: 1px solid var(--c-line);
  color: var(--c-ink);
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.showcase-nav-btn:hover { border-color: var(--c-navy); color: var(--c-navy); }

.showcase-caption {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--c-ink);
}
.showcase-index { color: var(--c-copper-deep); }

/* =====================================================================
   특허·인증 배지 & 갤러리
   ===================================================================== */
.badge-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.badge {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-navy);
  border: 1px solid var(--c-line);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: var(--c-mist);
}

.cert-card, .gallery-card {
  border: 1px solid var(--c-line);
  background: #fff;
  overflow: hidden;
  transition: border-color 0.25s ease;
}
.cert-card:hover, .gallery-card:hover { border-color: var(--c-navy); }
.cert-card figcaption, .gallery-card figcaption {
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  color: var(--c-steel);
  border-top: 1px solid var(--c-line);
}

img[data-src] { filter: blur(6px); background: var(--c-mist); transition: filter 0.35s ease; }
img.loaded { filter: blur(0); }

/* =====================================================================
   빠른 메뉴 (하단)
   ===================================================================== */
.footer-nav-group h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-steel-light);
  text-transform: uppercase;
  border-bottom: 1px solid var(--c-line);
  padding-bottom: 0.75rem;
  margin-bottom: 0.75rem;
}
.footer-nav-group button {
  color: var(--c-ink);
  font-size: 0.95rem;
}
.footer-nav-group button:hover { color: var(--c-navy); }

/* =====================================================================
   Footer
   ===================================================================== */
.site-footer { background: var(--c-ink); color: #C7CCDE; }
.site-footer a:hover { color: #fff; }
.site-footer h2 { color: #fff; }

/* =====================================================================
   스크롤 리빌 (단일 오케스트레이션: 섹션 진입시 한 번)
   ===================================================================== */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* =====================================================================
   접근성: 포커스 표시
   ===================================================================== */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--c-copper);
  outline-offset: 2px;
}

.skip-to-content {
  position: absolute; left: -9999px; z-index: 100;
  padding: 1rem; background: var(--c-navy); color: #fff; text-decoration: none;
}
.skip-to-content:focus { left: 50%; transform: translateX(-50%); top: 1rem; }

button { transition: background-color 0.2s ease, color 0.2s ease, opacity 0.2s ease, border-color 0.2s ease; }