/* ============================================
   HEADER.CSS
   - Background tối, opacity ~70% → luôn mờ
   - Icon, hamburger, logo luôn trắng
   - Luôn hiện, không ẩn khi scroll
   ============================================ */

#header {
  background-color: rgba(10, 10, 10, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

/* Inner: chiều cao header */
.header-inner {
  height: 52px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo size */
.header-logo {
  height: 30px;
  filter: brightness(0) invert(1);
  /* luôn trắng */
}

/* Hamburger bars — luôn trắng */
.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  margin: 3.5px 0;
  border-radius: 1px;
  background-color: #ffffff;
  transition: transform 0.25s cubic-bezier(0.32, 0, 0.26, 1), opacity 0.2s ease;
}

/* Cart icon — luôn trắng */
#cart-btn svg {
  stroke: #ffffff;
}

/* Badge */
#cart-badge {
  background-color: #ffffff;
  color: #111111;
}

/* === Menu overlay === */
#menu-overlay {
  display: block;
  transition: opacity 0.35s cubic-bezier(0.32, 0, 0.26, 1), transform 0.35s cubic-bezier(0.32, 0, 0.26, 1);
}

#menu-overlay[aria-hidden="true"] {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transform: translateY(-16px);
  transition: opacity 0.35s cubic-bezier(0.32, 0, 0.26, 1), transform 0.35s cubic-bezier(0.32, 0, 0.26, 1), visibility 0s linear 0.35s;
}

#menu-overlay[aria-hidden="false"] {
  opacity: 1;
  pointer-events: all;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.35s cubic-bezier(0.32, 0, 0.26, 1), transform 0.35s cubic-bezier(0.32, 0, 0.26, 1), visibility 0s;
}

/* Menu link underline */
.menu-link {
  position: relative;
}

.menu-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 16px;
  right: 16px;
  height: 1px;
  background: rgba(249, 249, 249, 0.4);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s cubic-bezier(0.32, 0, 0.26, 1);
}

.menu-link:hover::after,
.menu-link:focus::after {
  transform: scaleX(1);
}