/* Header Styles for SN Batteries */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  z-index: 9999;
  display: flex;
  align-items: center;
  transition: background-color var(--duration-slow) var(--ease-out),
              backdrop-filter var(--duration-slow) var(--ease-out),
              border-color var(--duration-slow) var(--ease-out),
              box-shadow var(--duration-slow) var(--ease-out),
              height var(--duration-slow) var(--ease-out);
  background-color: transparent;
  border-bottom: 1px solid transparent;
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }
}

/* Scrolled state applied via JS */
.site-header.scrolled {
  height: 64px;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 20px -5px rgba(0, 0, 0, 0.08);
}

@media (max-width: 768px) {
  .site-header.scrolled {
  height: 64px;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 20px -5px rgba(0, 0, 0, 0.08);
}
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo brand styling */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  z-index: 1001;
}

.logo-image {
  height: 48px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  display: block;
  transition: height var(--duration-normal) var(--ease-out);
}

@media (max-width: 768px) {
  .logo-image {
    height: 38px;
  }
}

.site-header.scrolled .logo-image {
  height: 40px;
}

@media (max-width: 768px) {
  .site-header.scrolled .logo-image {
    height: 32px;
  }
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-accent);
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo-sub {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

/* Header style modifications depending on page templates */
.site-header.theme-dark-init:not(.scrolled) .logo-text {
  color: #FFFFFF;
}

.site-header.theme-dark-init:not(.scrolled) .logo-sub {
  color: var(--color-text-muted);
}

/* Navigation bar */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

@media (max-width: 1024px) {
  .nav-menu {
    display: none;
  }
}

.nav-link {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 15px;
  color: var(--color-text-primary);
  padding: var(--space-2) 0;
  position: relative;
  transition: var(--transition-colors);
}

.site-header.theme-dark-init:not(.scrolled) .nav-link {
  color: rgba(255, 255, 255, 0.85);
}

.site-header.theme-dark-init:not(.scrolled) .nav-link:hover {
  color: #FFFFFF;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* Underline effect on hover */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--duration-fast) var(--ease-out);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-accent);
  font-weight: 600;
}

.site-header.theme-dark-init:not(.scrolled) .nav-link.active {
  color: #FFFFFF;
}

.nav-link.active::after {
  width: 100%;
}

.site-header.theme-dark-init:not(.scrolled) .nav-link.active::after {
  background-color: #FFFFFF;
}

/* Right-side actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

@media (max-width: 1024px) {
  .header-actions .btn {
    display: none;
  }
}

/* Mobile drawer toggle */
.drawer-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 24px;
  cursor: pointer;
  z-index: 1001;
  padding: var(--space-1);
}

.site-header.theme-dark-init:not(.scrolled) .drawer-toggle {
  color: #FFFFFF;
}

@media (max-width: 1024px) {
  .drawer-toggle {
    display: block;
  }
}

/* Mobile Navigation Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.4);
  z-index: 1002;
  transition: right 0s linear var(--duration-normal), opacity var(--duration-normal) var(--ease-out);
  opacity: 0;
  visibility: hidden;
  display: flex;
  justify-content: flex-end;
}

.mobile-drawer.open {
  right: 0;
  opacity: 1;
  visibility: visible;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.drawer-content {
  width: 80vw;
  max-width: 320px;
  height: 100%;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-2xl);
  padding: 80px var(--space-6) var(--space-6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-spring);
}

.mobile-drawer.open .drawer-content {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.drawer-link {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
  padding-block: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.drawer-link.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.drawer-footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: auto;
}