/* ============================================================
   STARGATE 통합 네비게이션 — 3사이트 공통 스타일
   stargate11.com / blog.stargateedu.co.kr / stargateshop.co.kr
   ------------------------------------------------------------
   브랜드 컬러
     --sg-navy   : #0B1A3A  (메인 딥네이비, 별의문 밤하늘)
     --sg-gold   : #C9A24E  (별빛 골드)
     --sg-ink    : #14213D  (본문 잉크)
     --sg-paper  : #F8F7F2  (배경 종이)
     --sg-mute   : #6B7280  (보조 텍스트)
   ============================================================ */

:root {
  --sg-navy: #0B1A3A;
  --sg-gold: #C9A24E;
  --sg-ink:  #14213D;
  --sg-paper:#F8F7F2;
  --sg-mute: #6B7280;
  --sg-line: #E5E7EB;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans KR", "Pretendard", "Malgun Gothic", "맑은 고딕", system-ui, -apple-system, sans-serif;
  color: var(--sg-ink);
  background: var(--sg-paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

/* ────── Header ────── */
.sg-header {
  background: var(--sg-navy);
  color: #fff;
  border-bottom: 2px solid var(--sg-gold);
  position: sticky;
  top: 0;
  z-index: 100;
}

.sg-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.sg-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.3px;
}

.sg-brand__mark {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--sg-gold);
  color: var(--sg-navy);
  border-radius: 6px;
  font-weight: 900;
  font-size: 14px;
}

.sg-brand__sub {
  color: var(--sg-gold);
  font-weight: 400;
  font-size: 12px;
  margin-left: 4px;
}

.sg-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.sg-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.78);
  transition: all 0.15s;
}

.sg-nav__link:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.sg-nav__link.is-active {
  background: var(--sg-gold);
  color: var(--sg-navy);
  font-weight: 700;
}

.sg-nav__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
}

/* ────── Hero / 페이지 헤딩 ────── */
.sg-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 32px;
}

.sg-hero__eyebrow {
  font-size: 13px;
  color: var(--sg-gold);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.sg-hero__title {
  font-size: 42px;
  line-height: 1.2;
  font-weight: 800;
  margin: 0 0 16px;
  letter-spacing: -1px;
}

.sg-hero__lead {
  font-size: 17px;
  color: var(--sg-mute);
  max-width: 720px;
  margin: 0;
}

/* ────── Section / Card ────── */
.sg-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.sg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.sg-card {
  background: #fff;
  border: 1px solid var(--sg-line);
  border-radius: 14px;
  padding: 24px;
  transition: transform 0.15s, box-shadow 0.15s;
}

.sg-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11,26,58,0.08);
}

.sg-card__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--sg-gold);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.sg-card__title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}

.sg-card__desc {
  font-size: 14px;
  color: var(--sg-mute);
  margin: 0 0 16px;
}

.sg-card__cta {
  font-size: 14px;
  font-weight: 600;
  color: var(--sg-navy);
  border-bottom: 2px solid var(--sg-gold);
  padding-bottom: 1px;
}

/* ────── 사이트 간 링크 박스 (Cross-link) ────── */
.sg-cross {
  background: linear-gradient(135deg, var(--sg-navy) 0%, #1a2a52 100%);
  color: #fff;
  border-radius: 16px;
  padding: 32px;
  margin: 32px auto;
  max-width: 1200px;
}

.sg-cross__title {
  font-size: 13px;
  color: var(--sg-gold);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
  font-weight: 600;
}

.sg-cross__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.sg-cross__item {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 18px 20px;
  display: block;
  transition: all 0.15s;
}

.sg-cross__item:hover {
  background: rgba(255,255,255,0.10);
  border-color: var(--sg-gold);
}

.sg-cross__item.is-current {
  background: rgba(201,162,78,0.15);
  border-color: var(--sg-gold);
}

.sg-cross__name {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.sg-cross__url {
  font-size: 12px;
  color: var(--sg-gold);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

/* ────── Footer ────── */
.sg-footer {
  background: #0a0f1f;
  color: rgba(255,255,255,0.65);
  padding: 40px 24px 24px;
  font-size: 13px;
}

.sg-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.sg-footer__col h4 {
  color: #fff;
  font-size: 13px;
  margin: 0 0 12px;
  letter-spacing: 0.5px;
}

.sg-footer__col a {
  display: block;
  padding: 4px 0;
  color: rgba(255,255,255,0.6);
}

.sg-footer__col a:hover { color: var(--sg-gold); }

.sg-footer__bottom {
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}

/* ────── Mobile ────── */
@media (max-width: 768px) {
  .sg-header__inner { flex-direction: column; gap: 12px; padding: 12px 16px; }
  .sg-nav { flex-wrap: wrap; justify-content: center; }
  .sg-nav__link { padding: 6px 10px; font-size: 13px; }
  .sg-hero { padding: 40px 16px 24px; }
  .sg-hero__title { font-size: 30px; }
  .sg-section { padding: 24px 16px 48px; }
  .sg-cross { margin: 24px 16px; padding: 24px; }
  .sg-footer__inner { grid-template-columns: 1fr 1fr; gap: 24px; }
}