/* =====================================================
   NAVIGATION STYLES - Navegación Moderna
   ===================================================== */

/* === HEADER PRINCIPAL === */
.app-header {
  background-color: var(--bg-primary);
  border-bottom: var(--border-width) solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: all var(--transition-normal);
}

.app-header.scrolled {
  box-shadow: var(--shadow-md);
}

/* === NAVBAR === */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.navbar-brand:hover {
  color: var(--primary-color);
}

.navbar-brand .logo {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-bold);
}

/* === NAVIGATION MENU === */
.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.nav-link.active {
  font-weight: var(--font-weight-semibold);
}

.nav-link .icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* === DROPDOWN MENU === */
.nav-item.dropdown {
  position: relative;
}

.dropdown-toggle::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  margin-left: var(--spacing-sm);
  transition: transform var(--transition-fast);
}

.dropdown-menu {
  border-radius: var(--border-radius-lg, 0.5rem);
  box-shadow: var(--shadow-lg, 0 0.5rem 1rem rgba(0, 0, 0, 0.15));
  padding: var(--spacing-sm, 0.25rem);
  min-width: 200px;
  z-index: var(--z-dropdown, 1000);
}

.dropdown-menu.show {
  animation: navDropdownFadeIn 0.2s ease;
}

@keyframes navDropdownFadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to   { opacity: 1; transform: translateY(0); }
}

.dropdown-toggle.show::after {
  transform: rotate(180deg);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  color: var(--primary-color);
  background-color: var(--bg-tertiary);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: var(--spacing-sm) 0;
}

/* === MOBILE MENU === */
.navbar-toggler {
  display: none;
  background: none;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.navbar-toggler:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--primary-color);
}

.navbar-toggler .hamburger {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.navbar-toggler .hamburger span {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

/* === SIDEBAR NAVIGATION === */
.sidebar {
  width: 280px;
  height: 100vh;
  background-color: var(--bg-primary);
  border-right: var(--border-width) solid var(--border-color);
  position: fixed;
  left: 0;
  top: 0;
  z-index: var(--z-fixed);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
}

.sidebar.show {
  transform: translateX(0);
}

.sidebar-header {
  padding: var(--spacing-xl);
  border-bottom: var(--border-width) solid var(--border-color);
}

.sidebar-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.sidebar-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-nav .nav-item {
  margin-bottom: var(--spacing-xs);
}

.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
  color: var(--primary-color);
  background-color: var(--primary-light);
}

.sidebar-nav .nav-link .icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* === BREADCRUMBS === */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
  background-color: var(--bg-secondary);
  border-bottom: var(--border-width) solid var(--border-color);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  color: var(--text-muted);
  margin-left: var(--spacing-sm);
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--primary-color);
}

.breadcrumb-item.active {
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
}

/* === PAGE HEADER === */
.page-header {
  background-color: var(--bg-primary);
  border-bottom: var(--border-width) solid var(--border-color);
  padding: var(--spacing-2xl) var(--spacing-xl);
}

.page-header-content {
  max-width: 1200px;
  margin: 0 auto;
}

.page-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin: 0 0 var(--spacing-sm) 0;
}

.page-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin: 0;
}

.page-actions {
  margin-top: var(--spacing-xl);
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* === USER MENU === */
.user-menu {
  position: relative;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-avatar:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.user-menu .dropdown-menu {
  right: 0;
  left: auto;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 991.98px) {
  .navbar-toggler {
    display: block;
  }

  .navbar-collapse {
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--bg-primary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
  }

  .navbar-nav {
    width: 100%;
    align-items: stretch;
    gap: var(--spacing-xs);
  }

  .navbar-nav .nav-item {
    width: 100%;
  }

  .navbar-nav .nav-link {
    justify-content: flex-start;
    width: 100%;
  }

  .navbar-nav .dropdown-menu {
    position: static;
    min-width: 100%;
    margin-top: var(--spacing-xs);
    box-shadow: none;
  }
  
  .page-header {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
  
  .page-title {
    font-size: var(--font-size-2xl);
  }
  
  .page-actions {
    margin-top: var(--spacing-lg);
  }
  
  .breadcrumb {
    padding: var(--spacing-md) var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .navbar-brand {
    font-size: var(--font-size-lg);
  }
  
  .page-title {
    font-size: var(--font-size-xl);
  }
  
  .page-actions {
    flex-direction: column;
  }
  
  .page-actions .btn {
    justify-content: center;
  }
}

/* === ANIMATIONS === */
@keyframes slideInDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.navbar-collapse.show {
  animation: slideInDown var(--transition-normal);
}

.sidebar.show {
  animation: slideInLeft var(--transition-normal);
}

/* === SCROLL BEHAVIOR === */
.navbar {
  transition: padding var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  padding: var(--spacing-md) var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

/* === FOCUS STATES === */
.nav-link:focus,
.dropdown-item:focus,
.navbar-toggler:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* === ACTIVE STATES === */
.nav-item.active .nav-link {
  color: var(--primary-color);
  background-color: var(--primary-light);
  position: relative;
}

.nav-item.active .nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background-color: var(--primary-color);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}