/* ============================================
   1. 디자인 토큰 (색상 / 폰트 / 간격을 한 곳에서 관리)
   ============================================ */
:root {
  --bg: #FFFFFF;          /* 전체 배경 - 화이트 */
  --surface: #F5F6F8;     /* 카드 배경 - 아주 옅은 그레이 */
  --ink: #1C1C1C;         /* 기본 텍스트(거의 검정) */
  --ink-muted: #6B6B6B;   /* 보조 텍스트 - 로고 옆 회색 톤 */
  --accent: #05308F;      /* 브랜드 네이비 블루 - 강조/CTA */
  --accent-2: #3D63C4;    /* 밝은 네이비 - 보조 강조, 어두운 배경 위 텍스트용 */
  --brand-dark: #041F5E;  /* 짙은 네이비 - 헤더/푸터 등 배경용 */
  --line: rgba(5, 48, 143, 0.14);

  --font-kr: 'Pretendard', -apple-system, sans-serif;
  --font-num: 'Space Grotesk', var(--font-kr);

  --container-w: 1120px;
}

/* ============================================
   2. 리셋 & 기본 세팅
   ============================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-kr);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.section-desc {
  color: var(--ink-muted);
  max-width: 620px;
  font-size: 16px;
}

/* ============================================
   3. 버튼
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--accent);
  color: #FFFFFF;
}
.btn--primary:hover { transform: translateY(-2px); background: var(--brand-dark); }

.btn--outline {
  border: 1.5px solid var(--accent);
  color: var(--accent);
}
.btn--outline:hover { transform: translateY(-2px); background: var(--accent); color: #FFFFFF; }

.btn--ghost {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--ink);
  border: 1.5px solid var(--line);
  padding: 9px 18px;
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================
   4. 헤더
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  will-change: transform; /* 스크롤 중 별도 레이어로 합성해 버벅임 완화 */
}

.header__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  margin-right: auto;
}
.logo__img {
  height: 22px;
  width: auto;
  display: block;
}
.logo__mark { color: var(--accent); display: inline-flex; }

.nav ul { display: flex; gap: 32px; }
.nav a {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-muted);
  transition: color 0.15s ease;
}
.nav a:hover { color: var(--ink); }

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav__toggle span {
  width: 100%;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* ============================================
   5. 히어로
   ============================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 100px;
}

.hero__rings {
  position: absolute;
  right: -140px;
  top: 50%;
  transform: translateY(-50%);
  width: 600px;
  opacity: 0.9;
  pointer-events: none;
}
.ring {
  fill: none;
  stroke: var(--accent-2);
  stroke-width: 1.4;
}
.ring--1 { opacity: 0.55; }
.ring--2 { opacity: 0.35; }
.ring--3 { opacity: 0.2; }

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.55; }
  50% { transform: scale(1.05); opacity: 0.85; }
}
.ring--1 { transform-origin: 300px 300px; animation: pulse 3.2s ease-in-out infinite; }

.hero__inner { position: relative; max-width: 640px; }

.hero__title {
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 22px;
}
.hero__title .highlight { color: var(--accent); }

.hero__desc {
  font-size: 17px;
  color: var(--ink-muted);
  margin-bottom: 34px;
}

.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* ============================================
   6. 신뢰 지표 바
   ============================================ */
.stats {
  background: var(--brand-dark);
  color: var(--bg);
}
.stats__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding: 34px 24px;
  justify-content: space-between;
}
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__num {
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 700;
}
.stat__label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.03em;
}

/* ============================================
   7. 회사소개
   ============================================ */
.about { padding: 100px 0; }
.about__inner { max-width: 760px; }

/* 회사소개 인용구 */
.about__quote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 20px;
  margin: 28px 0;
  font-size: 18px;
  font-weight: 700;
  font-style: normal;
}

/* ============================================
   7-1. 연혁
   ============================================ */
.history { padding: 0 0 100px; }

.history-list {
  margin-top: 32px;
  border-top: 1px solid var(--line);
}
.history-list li {
  display: flex;
  gap: 28px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.history-list__date {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--accent);
  width: 90px;
  flex-shrink: 0;
}
.history-list__text {
  font-size: 15px;
  color: var(--ink);
}

/* ============================================
   8. 렌탈상품
   ============================================ */
.products { padding: 20px 0 100px; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
  align-items: start;
}

.product-card {
  background: var(--surface);
  border-radius: 20px;
  padding: 36px;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(5, 48, 143, 0.1);
}

.product-card--accent {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.product-card--accent .product-card__icon { color: var(--accent-2); }
.product-card--accent .product-card__list li::before { background: var(--accent-2); }

.product-card__icon { color: var(--accent); margin-bottom: 18px; }
.product-card h3 { font-size: 21px; font-weight: 800; margin-bottom: 10px; }
.product-card > p { color: var(--ink-muted); font-size: 15px; margin-bottom: 20px; }
.product-card--accent > p { color: rgba(255, 255, 255, 0.75); }

.product-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  margin-bottom: 8px;
}
.product-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* 마우스 오버 시 세로로 펼쳐지며 나타나는 제품 사진 영역 */
.product-card__reveal {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.product-card__reveal-inner {
  text-align: center;
  padding-top: 22px;
  margin-top: 22px;
  border-top: 1px dashed var(--line);
}
.product-card__reveal img {
  display: block;
  width: 100%;
  max-width: 200px;
  margin: 0 auto 10px;
  object-fit: contain;
  background: #FFFFFF;
  border-radius: 12px;
  padding: 10px;
  box-shadow: 0 4px 14px rgba(5, 48, 143, 0.12);
}
.product-card__reveal-caption {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-muted);
}
.product-card:hover .product-card__reveal,
.product-card.is-revealed .product-card__reveal {
  max-height: 300px;
}
.product-card--accent .product-card__reveal-caption { color: rgba(255, 255, 255, 0.8); }
.product-card--accent:hover .product-card__reveal-inner { border-top-color: rgba(255, 255, 255, 0.25); }

/* 렌탈상품 보기로 펼쳐진 상태 - 클릭하면 스마트스토어로 이동함을 암시 */
.product-card.is-revealed {
  cursor: pointer;
}
.product-card.is-revealed:hover {
  box-shadow: 0 16px 40px rgba(5, 48, 143, 0.14);
}

/* 한 카드 안에 제품 사진 2개를 나란히 보여줄 때 */
.product-card__reveal--dual {
  display: flex;
  gap: 16px;
}
.product-card__reveal-item {
  flex: 1;
  min-width: 0;
}
.product-card__reveal--dual img {
  max-width: 130px;
  height: 90px;
  width: auto;
  object-fit: contain;
}

@media (max-width: 860px) {
  .product-card__reveal { display: none; }
}

/* ============================================
   9. 포트폴리오
   ============================================ */
.portfolio { padding: 20px 0 100px; }

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.portfolio-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px;
}
.portfolio-card__tag {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(5, 48, 143, 0.08);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.portfolio-card h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.portfolio-card p { font-size: 14px; color: var(--ink-muted); }

/* ============================================
   9-1. 고객사
   ============================================ */
.clients { padding: 20px 0 100px; }

.clients-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}
.clients-list li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-muted);
  transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  cursor: default;
}
.clients-list li:hover {
  transform: scale(1.08);
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: 0 6px 16px rgba(5, 48, 143, 0.12);
}

/* 로고 이미지가 들어간 고객사 항목 (경기도교육청 등) */
.clients-list__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 10px;
}
.clients-list__logo {
  width: auto;
  height: 1em;
  object-fit: contain;
  flex-shrink: 0;
}

/* ============================================
   10. 푸터
   ============================================ */
.footer {
  background: var(--brand-dark);
  color: var(--bg);
  padding: 64px 0 0;
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}
.footer__brand { display: flex; flex-direction: column; gap: 6px; max-width: 260px; }
.footer__brand .logo__mark { color: var(--accent-2); }
.footer__brand strong { font-family: var(--font-num); font-size: 18px; }
.footer__brand p { font-size: 13px; color: rgba(255, 255, 255, 0.6); }

.footer__info p {
  font-size: 14px;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.85);
}
.footer__info span {
  display: inline-block;
  width: 52px;
  color: rgba(255, 255, 255, 0.45);
  font-size: 12px;
}
.footer__info a:hover { color: var(--accent-2); }

.footer__bottom {
  padding: 22px 24px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   11. 반응형 (모바일)
   ============================================ */
@media (max-width: 860px) {
  .nav { display: none; }
  .nav__toggle { display: flex; }
  .header__tel { display: none; }
  .product-grid { grid-template-columns: 1fr; }
  .portfolio-grid { grid-template-columns: 1fr; }
  .hero__rings { display: none; }
  .hero { padding: 80px 0 60px; }

  /* 모바일 메뉴가 열렸을 때 - script.js에서 .is-open을 붙였다 뗐다 함 */
  .nav.is-open {
    display: block;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 12px 24px 20px;
  }
  .nav.is-open ul { flex-direction: column; gap: 4px; }
  .nav.is-open a { display: block; padding: 12px 0; }
}

/* 스크롤 시 등장 애니메이션용 클래스 (JS에서 추가) */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ============================================
   12. 전화번호 팝업
   ============================================ */
.call-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
}
.call-modal.is-open { display: flex; }

.call-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 31, 94, 0.55);
  backdrop-filter: blur(2px);
}

.call-modal__box {
  position: relative;
  background: var(--surface);
  border-radius: 20px;
  padding: 40px 36px;
  max-width: 340px;
  width: calc(100% - 48px);
  text-align: center;
  box-shadow: 0 24px 60px rgba(4, 31, 94, 0.35);
  animation: callModalIn 0.25s ease;
}
@keyframes callModalIn {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.call-modal__close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: none;
  border: none;
  font-size: 24px;
  line-height: 1;
  color: var(--ink-muted);
  cursor: pointer;
}
.call-modal__close:hover { color: var(--ink); }

.call-modal__eyebrow {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 10px;
}
.call-modal__number {
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.call-modal__desc {
  font-size: 14px;
  color: var(--ink-muted);
  margin-bottom: 26px;
}
.call-modal__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.call-modal__actions .btn { width: 100%; }