/* Invoice Portal - Components: Header, Nav, User Menu, Search */

/* Header theming (uses base tokens) */
:root{
  --hdr-bg: rgba(10, 17, 31, .65);
  --hdr-bg-strong: rgba(10, 17, 31, .95);
  --hdr-border: rgba(0,0,0,.10);
  --hdr-text: #0b1220;
  --hdr-text-inverse: #eaf0ff;
  --hdr-muted: #64748b;
  --gold: #d4af37;
  --ring: rgba(37, 99, 235, .35); /* based on --primary */
}

/* Sticky, modern header (light base with subtle elevation) */
.invoice-header{
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: var(--border);
  box-shadow: var(--shadow-sm);
}

/* Layout container */
.invoice-header .header-container{
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  min-height: 68px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: var(--space-lg);
}

/* Brand */
.header-brand .brand-link{
  display: grid;
  grid-auto-flow: column;
  align-items: center;
  gap: var(--space-md);
  color: var(--dark);
  font-weight: 700;
  text-decoration: none;
}
.brand-logo{
  width: 40px; height: 40px; border-radius: var(--radius-md);
  display: grid; place-items: center;
  color: var(--white); font-size: var(--text-xl);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: 0 6px 16px rgba(37, 99, 235, .25);
}
.brand-info{ display: grid; line-height: 1.1; }
.brand-name{ font-size: var(--text-lg); color: var(--dark); }
.brand-tagline{
  font-size: var(--text-xs); color: var(--gray-500);
  text-transform: uppercase; letter-spacing: .5px;
}

/* Primary navigation */
.header-nav{
  display: grid;
  grid-auto-flow: column;
  align-items: center;
  gap: var(--space-xs);
  justify-content: center;
}
.header-nav .nav-link{
  display: inline-grid;
  grid-auto-flow: column;
  align-items: center;
  gap: var(--space-sm);
  padding: calc(var(--space-sm) + 2px) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--gray-700);
  font-weight: 600;
  text-decoration: none;
  transition: color .16s ease, background-color .16s ease, box-shadow .16s ease, transform .12s ease;
}
.header-nav .nav-link .bi{ font-size: var(--text-lg); }
.header-nav .nav-link:hover{
  background: var(--gray-100);
  color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .10);
}
.header-nav .nav-link.active{
  color: var(--white);
  background: linear-gradient(180deg, #ffe8a3, var(--gold));
  box-shadow: 0 10px 26px rgba(212,175,55,.28);
}

/* Actions (search, user) */
.header-actions{
  display: grid;
  grid-auto-flow: column;
  align-items: center;
  gap: var(--space-sm);
}
.btn-icon,
.mobile-menu-toggle{
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 0; cursor: pointer;
  border-radius: var(--radius-md);
  background: var(--gray-100);
  color: var(--gray-700);
  transition: transform .12s ease, box-shadow .16s ease, background-color .16s ease, color .16s ease;
}
.btn-icon:hover,
.mobile-menu-toggle:hover{
  background: var(--gray-200);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0,0,0,.10);
}
.btn-icon:focus-visible,
.mobile-menu-toggle:focus