/**
 * AVENIX Venture - Header & Mobile Drawer Navigation
 * Mobile-First Responsive Architecture
 */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  background-color: var(--color-glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-glass-border);
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  position: relative;
}

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

.brand-logo__svg {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.brand-logo__svg svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.brand-logo__svg polygon {
  stroke: var(--color-secondary);
  opacity: 0.6;
  transition: stroke 0.2s ease, opacity 0.2s ease;
}

[data-theme="dark"] .brand-logo__svg polygon {
  stroke: var(--color-accent);
  opacity: 0.65;
}

.brand-logo__svg path {
  fill: var(--color-primary);
  /* Emerald Green */
  transition: fill 0.2s ease, filter 0.2s ease;
}

.brand-logo__svg circle {
  fill: var(--color-accent);
  /* Electric Cyan */
  transition: fill 0.2s ease, filter 0.2s ease;
}

.brand-logo:hover .brand-logo__svg {
  transform: scale(1.05);
}

.brand-logo:hover .brand-logo__svg path {
  filter: drop-shadow(0 0 8px var(--color-primary-glow));
}

.brand-logo:hover .brand-logo__svg circle {
  filter: drop-shadow(0 0 6px var(--color-accent));
}

.brand-logo__text {
  display: flex;
  flex-direction: column;
}

.brand-logo__name {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.25rem;
  letter-spacing: var(--ls-tight);
  color: var(--color-text-primary);
  line-height: 1.1;
  transition: color 0.2s ease;
}

.brand-logo__tagline {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  /* Emerald Green */
  font-weight: var(--fw-bold);
  font-family: var(--font-heading);
  transition: color 0.2s ease;
}

/* Header Action Group (Theme toggle + CTA + Hamburger) */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Mobile Hamburger Button */
.nav-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent !important;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0) !important;
  -webkit-touch-callout: none !important;
  outline: none;
  user-select: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.nav-toggle-btn:hover {
  border-color: var(--color-primary);
}

.nav-toggle-btn:active,
.nav-toggle-btn:focus {
  background: var(--color-bg-alt) !important;
  color: var(--color-text-primary) !important;
  outline: none !important;
  -webkit-tap-highlight-color: transparent !important;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0) !important;
  opacity: 1 !important;
}

.nav-toggle-btn svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* Mobile Navigation Drawer Overlay */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 14, 23, 0.65);
  backdrop-filter: blur(4px);
  z-index: var(--z-drawer);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-nav-backdrop.is-active {
  opacity: 1;
  visibility: visible;
}

/* Mobile Navigation Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 86vw;
  max-width: 380px;
  background: var(--color-surface);
  z-index: calc(var(--z-drawer) + 1);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform var(--transition-spring);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

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

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.drawer-body {
  padding: var(--space-4);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.drawer-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.drawer-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.drawer-nav-link:hover,
.drawer-nav-link.is-active {
  background-color: var(--color-primary-alpha);
  color: var(--color-primary);
}

.drawer-nav-link--sub {
  min-height: 40px;
  padding-left: var(--space-6);
  font-size: var(--fs-body-sm);
  color: var(--color-text-secondary);
}

.drawer-nav-link--sub::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-text-muted);
  margin-right: var(--space-2);
  transition: background-color var(--transition-fast);
}

.drawer-nav-link--sub:hover::before,
.drawer-nav-link--sub.is-active::before {
  background: var(--color-primary);
}

.drawer-section-title {
  font-size: var(--fs-caption);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--color-text-muted);
  font-family: var(--font-heading);
  margin-top: var(--space-3);
  margin-bottom: var(--space-1);
  padding-left: var(--space-3);
}

.drawer-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* Hide Desktop Navbar elements on Mobile */
.desktop-nav {
  display: none;
}

/* Tablet / Desktop Upgrades (min-width: 1024px) */
@media (min-width: 1024px) {
  .header-inner {
    height: 80px;
  }

  .nav-toggle-btn {
    display: none;
  }

  /* Clean Airy Desktop Navigation — Perfectly Centered Independent of Surrounding Elements */
  .desktop-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    z-index: 10;
  }
}