/* 헤더 내비게이션 — 배경 박스 없이 헤더 자리에 텍스트만 떠 있는 형태(사용자 지시).
   로고 / 프로젝트(드롭다운) / 문의 세 항목만 둔다. */

.site-header {
  position: fixed;
  top: 22px;
  left: var(--gutter);
  right: var(--gutter);
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  opacity: 0;
  animation: header-in 240ms 120ms var(--ease-stage) forwards;
}

@keyframes header-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: .875rem;
  font-weight: 600;
  letter-spacing: -.01em;
  cursor: pointer;
}

.brand-mark {
  border-radius: 6px;
  outline: 1px solid rgba(0, 0, 0, .08);
  outline-offset: -1px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link,
.nav-projects summary {
  font-size: .875rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
  transition-property: color;
  transition-duration: 160ms;
  transition-timing-function: ease-out;
}

.nav-link:hover,
.nav-projects summary:hover,
.nav-projects[open] summary { color: var(--ink); }

.nav-projects { position: relative; }

.nav-projects summary {
  display: flex;
  align-items: center;
  gap: 5px;
  list-style: none;
}
.nav-projects summary::-webkit-details-marker { display: none; }

.nav-projects summary .chev {
  transition: transform 180ms var(--ease-stage);
}
.nav-projects[open] summary .chev { transform: rotate(180deg); }

.nav-dropdown {
  position: absolute;
  top: calc(100% + 14px);
  right: 0;
  display: flex;
  flex-direction: column;
  min-width: 200px;
  padding: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(16px);
  box-shadow: var(--win-shadow);
  animation: dropdown-in 160ms var(--ease-stage) both;
}

@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}

.nav-dropdown a {
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--ink);
  transition-property: background-color;
  transition-duration: 140ms;
  transition-timing-function: ease-out;
}
.nav-dropdown a:hover,
.nav-dropdown a:focus-visible { background: color-mix(in srgb, var(--accent) 12%, transparent); }

@media (max-width: 767px) {
  .site-header { top: 16px; left: 20px; right: 20px; gap: 14px; }
  .site-nav { gap: 16px; }
  .brand span { display: none; } /* 좁은 화면은 마크만 — 텍스트까지 넣으면 내비와 부딪힌다 */
}

@media (prefers-reduced-motion: reduce) {
  .site-header { opacity: 1; animation: none; }
  .nav-dropdown { animation: none; }
}