/* ──────────────────────────────────────────────────────────────────
   site-nav.css — 랜딩/정적 페이지 공통 상단 네비게이션 + 모바일 드로어
   - 페이지의 기존 CSS 변수에 의존하되, 누락된 변수는 fallback 체인으로 흡수.
   - 페이지 .site-header (52~60px) 와 자연스럽게 어울리도록 36px 높이.
   ────────────────────────────────────────────────────────────────── */

/* 데스크톱 인라인 nav */
.site-nav {
  display: flex; align-items: center; gap: 2px;
  margin-left: 24px; margin-right: auto;
}
.nav-item { position: relative; }
.nav-summary, .nav-link {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 8px 12px; height: 36px;
  font-size: 13px; font-weight: 500;
  color: var(--text2, #333);
  background: transparent; border: none;
  border-radius: 6px;
  cursor: pointer; white-space: nowrap;
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease;
  letter-spacing: -0.01em;
  font-family: inherit;
}
.nav-chev {
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  opacity: 0.55;
  transition: transform 0.18s ease;
}
.nav-item:hover .nav-chev { transform: translateY(1px) rotate(-135deg); }
.nav-summary:hover, .nav-link:hover,
.nav-item:hover .nav-summary {
  color: var(--ms-red, var(--accent2, #C03A52));
}
.nav-dropdown {
  position: absolute;
  top: calc(100% - 2px); left: -4px;
  min-width: 200px;
  background: var(--panel, var(--card, #fff));
  border: 1px solid var(--border, #e2e2e2);
  border-radius: 8px;
  padding: 6px;
  box-shadow: 0 10px 28px rgba(27, 42, 78, 0.10);
  opacity: 0; visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.14s ease, transform 0.14s ease, visibility 0.14s;
  z-index: 110;
}
@media (prefers-color-scheme: dark) {
  .nav-dropdown { box-shadow: 0 10px 28px rgba(0, 0, 0, 0.5); }
}
[data-theme="dark"] .nav-dropdown {
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.55);
}
.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 9px 12px;
  font-size: 13px; font-weight: 500;
  color: var(--text2, #333);
  border-radius: 5px;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: background 0.12s ease, color 0.12s ease;
  white-space: nowrap;
}
.nav-dropdown a:hover {
  background: var(--input, var(--bg, #f0f0f0));
  color: var(--ms-red, var(--accent2, #C03A52));
}

/* 모바일 햄버거 버튼 */
.btn-nav-toggle {
  display: none;
  width: 32px; height: 32px; border-radius: 6px;
  border: 1px solid var(--border3, var(--border, #d8d8d8));
  background: transparent;
  color: var(--text3, #555);
  align-items: center; justify-content: center;
  padding: 0; cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
  flex-shrink: 0;
}
.btn-nav-toggle:hover {
  color: var(--ms-red, var(--accent2, #C03A52));
  border-color: var(--ms-red, var(--accent2, #C03A52));
}
.btn-nav-toggle svg { width: 18px; height: 18px; display: block; }
.btn-nav-toggle .ti-close { display: none; }
body.nav-open .btn-nav-toggle .ti-burger { display: none; }
body.nav-open .btn-nav-toggle .ti-close { display: block; }
body.nav-open .btn-nav-toggle {
  color: var(--ms-red, var(--accent2, #C03A52));
  border-color: var(--ms-red, var(--accent2, #C03A52));
}

/* 백드롭 + 드로어 — top 좌표는 JS 에서 헤더 높이에 맞춰 동적 설정 */
.nav-drawer-backdrop {
  display: none;
  position: fixed; top: 60px; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.32);
  z-index: 98;
  animation: navDrawerFade 0.18s ease-out;
}
body.nav-open .nav-drawer-backdrop { display: block; }
@keyframes navDrawerFade { from { opacity: 0; } to { opacity: 1; } }

.nav-drawer {
  display: none;
  position: fixed; top: 60px; left: 0; right: 0;
  background: var(--header, #fff);
  border-bottom: 1px solid var(--border, #e2e2e2);
  box-shadow: 0 14px 32px rgba(27, 42, 78, 0.10);
  max-height: calc(100dvh - 60px);
  overflow-y: auto;
  z-index: 99;
  padding: 6px 0 12px;
  animation: navDrawerSlide 0.2s ease-out;
}
[data-theme="dark"] .nav-drawer {
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5);
}
@media (prefers-color-scheme: dark) {
  .nav-drawer { box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5); }
}
body.nav-open .nav-drawer { display: block; }
@keyframes navDrawerSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.nav-drawer details {
  border-bottom: 1px solid var(--border2, var(--border, #e2e2e2));
}
.nav-drawer details:last-of-type,
.nav-drawer .drawer-link:last-of-type { border-bottom: none; }
.nav-drawer summary,
.nav-drawer .drawer-link {
  display: flex; align-items: center; justify-content: space-between;
  padding: 15px 24px;
  font-size: 14px; font-weight: 600;
  color: var(--text, #1a1a1a);
  cursor: pointer;
  list-style: none;
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-drawer .drawer-link {
  border-bottom: 1px solid var(--border2, var(--border, #e2e2e2));
  transition: color 0.12s ease, background 0.12s ease;
}
.nav-drawer .drawer-link:hover {
  color: var(--ms-red, var(--accent2, #C03A52));
  background: var(--bg, #f8f8f8);
}
.nav-drawer summary::-webkit-details-marker { display: none; }
.nav-drawer summary::after {
  content: '';
  width: 7px; height: 7px;
  border-right: 1.5px solid var(--text4, #666);
  border-bottom: 1.5px solid var(--text4, #666);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
.nav-drawer details[open] summary::after { transform: rotate(-135deg); }
.nav-drawer details[open] summary {
  color: var(--ms-red, var(--accent2, #C03A52));
}
.nav-drawer .drawer-sub {
  padding: 4px 0 10px;
  background: var(--bg, #f8f8f8);
  border-top: 1px solid var(--border2, var(--border, #e2e2e2));
}
.nav-drawer .drawer-sub a {
  display: block;
  padding: 11px 24px 11px 40px;
  font-size: 13px; font-weight: 500;
  color: var(--text3, #555);
  text-decoration: none;
  transition: color 0.12s ease;
  letter-spacing: -0.01em;
}
.nav-drawer .drawer-sub a:hover {
  color: var(--ms-red, var(--accent2, #C03A52));
}

@media (max-width: 900px) {
  .site-nav { display: none; }
  .btn-nav-toggle { display: inline-flex; }
  /* 정적 페이지(.site-header 의 직계 자식인 경우)에서는 우측으로 밀어 CTA 옆에 배치.
     랜딩(.header-btns 내부)에서는 이 셀렉터에 매칭되지 않아 영향 없음. */
  .site-header > .btn-nav-toggle { margin-left: auto; margin-right: 10px; }
}