/* =====================================================
   header.css — 프레이브 헤더 스타일
   ===================================================== */

.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-h);
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(8, 14, 20, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border-light);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── 로고 ── */
.header-logo {
  display: flex;
  align-items: center;
  height: 36px;
}
.header-logo img {
  height: 36px;
  width: auto;
  object-fit: contain;
}
.logo-fallback {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.1em;
}

/* ── 데스크탑 nav ── */
.header-nav { display: flex; }
.nav-list {
  display: flex;
  gap: 36px;
  align-items: center;
}
.nav-link {
  font-size: 0.82rem;
  letter-spacing: 0.15em;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding-bottom: 4px;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--grad);
  border-radius: 1px;
  transition: width var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--text);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ── 햄버거 ── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  background: none;
  border: none;
  cursor: pointer;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: var(--transition);
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── 모바일 메뉴 ── */
.mobile-menu {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  background: rgba(8, 14, 20, 0.97);
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 999;
}
.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}
.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
  text-align: center;
}
.mobile-nav-link {
  font-size: 1.6rem;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  transition: color var(--transition);
}
.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--text);
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── 반응형 ── */
@media (max-width: 768px) {
  .header-nav { display: none; }
  .hamburger { display: flex; }
}