/* ==========================================================
   Hi BodyMate — Header & Navigation
   ========================================================== */

/* ----------------------------------------------------------
   Header
   ---------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-bg2);
  border-bottom: 1px solid rgba(0, 173, 145, 0.12);
  transition: box-shadow var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* ----------------------------------------------------------
   Logo
   ---------------------------------------------------------- */
.header-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  margin-top: 8px;
}

.header-logo img {
  height: 36px;
  width: auto;
}

/* ----------------------------------------------------------
   Desktop Nav
   ---------------------------------------------------------- */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: 8px;
}

.nav-desktop a {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-h3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  display: flex;
  align-items: center;
}

.nav-desktop a:hover,
.nav-desktop a.active {
  background-color: var(--color-input-bg);
  color: var(--color-brand-teal);
}

/* ----------------------------------------------------------
   Hamburger Button (mobile)
   ---------------------------------------------------------- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
  flex-shrink: 0;
}

.nav-hamburger:hover {
  background-color: var(--color-input-bg);
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-h2);
  border-radius: var(--radius-full);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  transform-origin: center;
}

/* Hamburger open state */
.nav-hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ----------------------------------------------------------
   Mobile Drawer
   ---------------------------------------------------------- */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-bg2);
  border-bottom: 1px solid rgba(0, 173, 145, 0.12);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4) var(--space-6) var(--space-6);
  z-index: 99;
  flex-direction: column;
  gap: var(--space-1);
  animation: slideDown var(--transition-normal) ease;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-h3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-mobile a:hover,
.nav-mobile a.active {
  background-color: var(--color-input-bg);
  color: var(--color-brand-teal);
}

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

@media (min-width: 769px) {
  .nav-mobile { display: none !important; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}