/* ==========================================================================
   HEADER LAYOUT
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background-color: rgba(15, 39, 71, 0.95); /* Deep midnight blue, slightly transparent */
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  transition: height var(--transition-normal), background-color var(--transition-normal), box-shadow var(--transition-normal);
}

/* Header state when page is scrolled */
.site-header.scrolled {
  height: var(--header-height-shrink);
  background-color: rgba(15, 39, 71, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  border-bottom: 1px solid rgba(192, 192, 192, 0.15); /* Accent tint border on scroll */
}

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

/* Logo Section */
.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-bg-white);
  text-decoration: none;
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.logo-icon-svg {
  width: 38px;
  height: 38px;
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 2.2;
  transition: transform var(--transition-normal);
}

.logo-link:hover .logo-icon-svg {
  transform: rotate(20deg) scale(1.05);
  stroke: var(--color-bg-white);
}

.logo-text-wrapper {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-main-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.logo-sub-text {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  text-transform: uppercase;
}

/* Desktop Navigation Menu */
.desktop-nav {
  display: none;
  height: 100%;
}

.nav-list {
  display: flex;
  list-style: none;
  height: 100%;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--color-text-light-muted);
  font-weight: 500;
  font-size: 0.925rem;
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-bg-white);
}

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

/* Header Quick CTA Action Buttons */
.header-actions {
  display: none;
  align-items: center;
  gap: var(--space-md);
}

.btn-header-call {
  color: var(--color-bg-white);
  font-weight: 600;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--transition-fast);
}

.btn-header-call svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.btn-header-call:hover {
  color: var(--color-accent);
}

/* Toggle Hamburger Icon for Mobile */
.mobile-nav-toggle {
  background: none;
  border: none;
  color: var(--color-bg-white);
  cursor: pointer;
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  z-index: 1100;
  position: relative;
}

.mobile-nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-bg-white);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Transform toggle into 'X' when open */
.mobile-nav-toggle.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Nav Drawer Menu */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 360px;
  height: 100vh;
  background-color: var(--color-bg-darker);
  z-index: 1050;
  padding: calc(var(--header-height) + var(--space-lg)) var(--space-lg) var(--space-xl);
  display: flex;
  flex-direction: column;
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
  transition: right var(--transition-normal);
}

.mobile-nav-drawer.open {
  right: 0;
}

.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(7, 19, 36, 0.8);
  backdrop-filter: blur(4px);
  z-index: 1020;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.mobile-nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  list-style: none;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: var(--space-lg);
}

.mobile-nav-link {
  color: var(--color-text-light-muted);
  font-family: var(--font-headings);
  font-size: 1.25rem;
  font-weight: 600;
  display: block;
  padding: var(--space-xs) 0;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-bg-white);
  padding-left: var(--space-xs);
}

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: auto;
}

.mobile-nav-actions .btn {
  width: 100%;
  text-align: center;
}

/* ==========================================================================
   MEDIA QUERIES FOR LAYOUT RESPONSIVENESS
   ========================================================================== */
@media (min-width: 992px) {
  .desktop-nav {
    display: block;
  }
  .header-actions {
    display: flex;
  }
  .mobile-nav-toggle {
    display: none;
  }
  .mobile-nav-drawer,
  .mobile-nav-overlay {
    display: none;
  }
}