/* ============================================================
   OnlineInvoicesMaker.com — Premium Header Styles
   ============================================================ */

/* ============================================================
   SITE HEADER
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-card);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  z-index: var(--z-header);
  transition: all var(--transition-base);
}
.site-header.scrolled {
  box-shadow: var(--shadow-header);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}
.header-logo:hover { opacity: 0.88; }
.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-brand);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: var(--shadow-brand);
  position: relative;
  overflow: hidden;
}
.logo-icon::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 60%);
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo-name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}
.logo-tagline {
  font-size: 9px;
  font-weight: 600;
  color: var(--text-subtle);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Main Navigation */
.header-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 auto;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.nav-link.active {
  background: var(--brand-primary-ultra-light);
  color: var(--brand-primary);
  font-weight: 600;
}

/* Nav Dropdown */
.nav-dropdown-trigger {
  cursor: pointer;
  user-select: none;
}
.nav-dropdown-trigger .chevron {
  font-size: 10px;
  transition: transform var(--transition-fast);
}
.nav-dropdown-trigger:hover .chevron,
.nav-dropdown-trigger.open .chevron {
  transform: rotate(180deg);
}
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 260px;
  background: var(--bg-modal);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  pointer-events: none;
  z-index: var(--z-dropdown);
}
.nav-dropdown-trigger.open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: all;
}
.nav-dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  text-decoration: none;
}
.nav-dropdown-item:hover { background: var(--bg-tertiary); }
.nav-dropdown-item-icon {
  width: 36px; height: 36px;
  background: var(--brand-primary-ultra-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary);
  font-size: 16px;
  flex-shrink: 0;
}
.nav-dropdown-item-content { flex: 1; }
.nav-dropdown-item-title { font-size: var(--text-sm); font-weight: 600; color: var(--text-primary); }
.nav-dropdown-item-desc { font-size: var(--text-xs); color: var(--text-muted); margin-top: 2px; }

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

/* Theme Toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  font-size: 15px;
}
.theme-toggle:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-input);
}
.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}
.hamburger {
  width: 18px;
  height: 14px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: all var(--transition-base);
}
.mobile-menu-toggle.open .hamburger span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-toggle.open .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-toggle.open .hamburger span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav Drawer */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-card);
  z-index: calc(var(--z-header) - 1);
  transform: translateY(-100%);
  opacity: 0;
  transition: all var(--transition-slow);
  pointer-events: none;
  max-height: calc(100vh - var(--header-height));
  overflow-y: auto;
}
.mobile-nav.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.mobile-nav-inner { padding: 16px 20px 24px; }
.mobile-nav-section { margin-bottom: 20px; }
.mobile-nav-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-subtle);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0 4px;
  margin-bottom: 8px;
}
.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.mobile-nav-icon {
  width: 32px; height: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}
.mobile-nav-footer {
  border-top: 1px solid var(--border-card);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Announcement Bar */
.announcement-bar {
  background: var(--gradient-brand);
  color: white;
  text-align: center;
  padding: 8px 20px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  position: relative;
}
.announcement-bar a { color: rgba(255,255,255,0.9); text-decoration: underline; }
.announcement-bar a:hover { color: white; }
.announcement-close {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: white;
  opacity: 0.7;
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
  transition: opacity var(--transition-fast);
}
.announcement-close:hover { opacity: 1; }

/* Autosave indicator (generator page) */
.autosave-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 500;
}
.autosave-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gray-300);
  transition: background var(--transition-base);
}
.autosave-indicator.saving .autosave-dot {
  background: var(--brand-warning);
  animation: pulse-brand 1s infinite;
}
.autosave-indicator.saved .autosave-dot { background: var(--brand-success); }
.autosave-indicator.error .autosave-dot { background: var(--brand-danger); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .header-nav { display: none; }
  .mobile-menu-toggle { display: flex; }
  .header-actions .btn-sm:not(.btn-primary) { display: none; }
}
@media (max-width: 640px) {
  .logo-tagline { display: none; }
  .autosave-indicator { display: none; }
}