/* HEADER */
header {
  position: fixed;
  width: 90%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 2.5rem;
  z-index: 100;
}
header .header-wrap {
  position: relative;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(48px) saturate(200%) brightness(1.08);
  -webkit-backdrop-filter: blur(48px) saturate(200%) brightness(1.08);
  border-radius: 2rem;
  padding: 1.2rem 2rem;
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow:
    inset 0 1.5px 0 rgba(255, 255, 255, 0.75),
    inset 0 -1px 0 rgba(255, 255, 255, 0.15),
    inset 1px 0 0 rgba(255, 255, 255, 0.25),
    inset -1px 0 0 rgba(255, 255, 255, 0.25),
    0 4px 24px rgba(0, 0, 0, 0.07),
    0 1px 4px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}
/* 상단 specular highlight */
header .header-wrap::before {
  content: '';
  position: absolute;
  top: 0;
  left: 8%;
  width: 84%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    rgba(255, 255, 255, 0.95) 30%,
    rgba(255, 255, 255, 0.95) 70%,
    transparent
  );
}
/* 내부 굴절 광택 */
header .header-wrap::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.18) 0%,
    rgba(255, 255, 255, 0.0) 100%
  );
  border-radius: 2rem 2rem 0 0;
  pointer-events: none;
}
header .header-wrap h3 {
  font-size: 1.2rem;
  font-weight: 500;
  position: relative;
  z-index: 1;
}