/* 공통 상단 메뉴 — 모든 페이지가 이 파일 하나로 같은 메뉴를 쓴다.
   페이지마다 다른 CSS 의 영향을 받지 않도록 .sb- 로 시작하는 이름만 쓴다. */
.sb-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(8, 15, 36, 0.82);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid rgba(180, 206, 255, 0.12);
  font-family: Pretendard, "Pretendard Variable", "Noto Sans KR", system-ui, sans-serif;
  word-break: keep-all;
}
/* 홈·개발/마케팅 선택 화면: 원래처럼 화면 위에 떠 있게 */
.sb-header.sb-overlay {
  position: fixed;
  left: 0;
  right: 0;
}
.sb-header-in {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 1200px;
  height: 64px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 32px);
  box-sizing: border-box;
}
.sb-brand {
  margin-right: auto;
  color: #fff !important;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.03em;
  text-decoration: none !important;
}
.sb-brand span {
  color: #6ea2ff;
}
.sb-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-right: 22px;
}
.sb-nav a {
  position: relative;
  padding: 6px 2px;
  color: #c3cde3 !important;
  font-size: 15px;
  font-weight: 650;
  text-decoration: none !important;
  background: none !important;
  border-radius: 0 !important;
  transition: color 0.15s;
}
.sb-nav a:hover,
.sb-nav a.sb-on {
  color: #fff !important;
}
.sb-nav a.sb-on::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  border-radius: 2px;
  background: #c9d4ff;
}
.sb-nav a[data-sb="dev"]:hover,
.sb-nav a[data-sb="dev"].sb-on {
  color: #8db8ff !important;
}
.sb-nav a[data-sb="dev"].sb-on::after {
  background: #4f8dff;
}
.sb-nav a[data-sb="mk"]:hover,
.sb-nav a[data-sb="mk"].sb-on {
  color: #ff9cc7 !important;
}
.sb-nav a[data-sb="mk"].sb-on::after {
  background: #ff4f9a;
}
.sb-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 10px;
  color: #fff !important;
  font-size: 14px;
  font-weight: 750;
  white-space: nowrap;
  text-decoration: none !important;
  transition: border-color 0.15s, background-color 0.15s;
}
.sb-cta:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.06);
}
.sb-menu {
  display: none;
  width: 42px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  background: none;
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}
@media (max-width: 899px) {
  .sb-menu {
    display: inline-block;
  }
  .sb-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 4px 16px 12px;
    background: #0b1328;
    border-bottom: 1px solid rgba(180, 206, 255, 0.12);
  }
  .sb-header.is-open .sb-nav,
  .sb-nav.open {
    display: flex;
  }
  .sb-nav a {
    padding: 14px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  }
  .sb-nav a:last-child {
    border-bottom: 0;
  }
  .sb-nav a.sb-on::after {
    display: none;
  }
}
@media (max-width: 360px) {
  .sb-cta {
    padding: 0 10px;
  }
}

/* 배경 오로라는 글자 뒤로: 예전엔 본문 위(z-index 1)에 깔려 글씨에 빛이 비쳤다 */
.mk-page-light { z-index: -1 !important; }