/* Header & Navigation */

/* iOS scroll locking improvements */
html,
body {
  overscroll-behavior-y: contain;
}

.main-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgb(246 247 251 / 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgb(15 23 42 / 0.06);
  transition: box-shadow var(--transition-fast), background var(--transition-fast);
}

.main-header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgb(246 247 251 / 0.98);
}

.main-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-4);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 0 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  color: inherit;
}

.brand-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
}

.brand-text {
  display: grid;
  gap: 0.25rem;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.micro-tagline {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.nav-panel {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}


.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-weight: 600;
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-body);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  border: 1px solid rgb(15 23 42 / 0.14);
  background: var(--color-surface);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  margin-left: auto;
}

.mobile-menu-toggle .hamburger-line {
  height: 2px;
  width: 20px;
  background: var(--color-body);
  border-radius: var(--radius-pill);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-toggle:focus-visible {
  border-color: var(--color-primary);
}

.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgb(15 23 42 / 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 30;
  touch-action: none;
}

body.mobile-nav-open {
  overflow: hidden;
  position: relative;
}

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

body.mobile-nav-open .mobile-menu-toggle .hamburger-line:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

body.mobile-nav-open .mobile-menu-toggle .hamburger-line:nth-child(2) {
  opacity: 0;
}

body.mobile-nav-open .mobile-menu-toggle .hamburger-line:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

@media (width <= 1024px) {
  .nav-panel {
    gap: var(--space-3);
  }
}

@media (width <= 900px) {
  .nav-actions .btn--secondary {
    display: none;
  }
}

@media (width <= 768px) {
  .mobile-menu-toggle {
    display: inline-flex;
    margin-left: auto;
    order: 2;
    flex-shrink: 0;
  }
  
  .brand-group {
    order: 1;
    flex-shrink: 0;
  }
  
  .main-nav {
    justify-content: space-between;
  }

  .nav-panel {
    position: fixed;
    inset: calc(var(--header-height) + 8px) 0 auto;
    margin: 0;
    padding: var(--space-5);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    background: rgb(246 247 251 / 0.98);
    display: grid;
    gap: var(--space-4);
    box-shadow: var(--shadow-md);
    max-height: min(80dvh, 540px);
    overflow-y: auto;
    transform: translateY(12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    z-index: 40;
  }

  body.mobile-nav-open .nav-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .nav-links a {
    font-size: var(--text-lg);
    color: var(--color-body);
  }

  .nav-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .nav-actions .btn {
    width: 100%;
  }
}