/* CSS Custom Properties (Variables) */
:root {
  /* Color Palette */
  --color-primary: #667eea;
  --color-primary-dark: #5a6fd8;
  --color-primary-light: rgba(102, 126, 234, 0.1);
  --color-primary-gradient: linear-gradient(135deg, var(--color-primary) 50%, #764ba2 100%);
  
  /* Background Colors */
  --bg-primary: #1a1d29;
  --bg-secondary: #2a2d3a;
  --bg-tertiary: #3a3f52;
  --bg-quaternary: #4a4f62;
  --bg-overlay: rgba(0, 0, 0, 0.7);
  --bg-success-light: rgba(39, 174, 96, 0.1);
  --bg-error-light: rgba(231, 76, 60, 0.1);
  --bg-warning-light: rgba(243, 156, 18, 0.1);
  --bg-info-light: rgba(52, 152, 219, 0.1);
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #e2e5f1;
  --text-tertiary: #a0a4b8;
  --text-muted: rgba(160, 164, 184, 0.7);
  
  /* Status Colors */
  --color-success: #27ae60;
  --color-success-dark: #229954;
  --color-error: #e74c3c;
  --color-error-dark: #c0392b;
  --color-warning: #f39c12;
  --color-warning-dark: #e67e22;
  --color-info: #3498db;
  --color-info-dark: #2980b9;
  --color-muted: #95a5a6;
  --color-muted-dark: #7f8c8d;
  --color-yellow: #f1c40f;
  --color-purple: #9b59b6;
  --color-teal: #01757e;
  
  /* Status Badge Colors */
  --status-invited: rgba(52, 152, 219, 0.2);
  --status-confirmed: rgba(39, 174, 96, 0.2);
  --status-active: rgba(39, 174, 96, 0.2);
  --status-inactive: rgba(149, 165, 166, 0.2);
  --status-cancelled: rgba(231, 76, 60, 0.2);
  --status-example: rgba(155, 89, 182, 0.2);
  --status-database: rgba(243, 156, 18, 0.2);
  --status-admin: rgba(231, 76, 60, 0.2);
  --status-vertrieb: rgba(52, 152, 219, 0.2);
  --status-buchhaltung: rgba(243, 156, 18, 0.2);
  --status-praktikant: rgba(149, 165, 166, 0.2);
  
  /* Priority Colors */
  --priority-urgent: #e74c3c;
  --priority-high: #f39c12;
  --priority-medium: #3498db;
  --priority-low: #95a5a6;
  
  /* Border Colors */
  --border-primary: #4a4f62;
  --border-secondary: #3a3f52;
  --border-focus: var(--color-primary);
  --border-success: var(--color-success);
  --border-error: var(--color-error);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 15px;
  --spacing-lg: 20px;
  --spacing-xl: 25px;
  --spacing-2xl: 30px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 15px;
  --radius-2xl: 20px;
  --radius-round: 50%;
  --radius-pill: 9999px;
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 28px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-base: 1.6;
  --line-height-tight: 1.2;
  --line-height-relaxed: 1.4;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 15px 35px rgba(0, 0, 0, 0.3);
  --shadow-focus: 0 0 0 3px rgba(102, 126, 234, 0.1);
  --shadow-primary: 0 10px 20px rgba(102, 126, 234, 0.3);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-all: all var(--transition-base);
  
  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-overlay: 999;
  --z-modal: 1200;
  --z-tooltip: 1300;
  
  /* Layout */
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 80px;
  --mobile-header-height: 60px;
  --mobile-header-height-sm: 55px;
  
  /* Form Controls */
  --input-height: 52px;
  --input-height-sm: 44px;
  --input-padding: 12px 16px;
  --input-padding-sm: 8px 12px;
  --input-border-width: 2px;
  
  /* Buttons */
  --btn-height: 44px;
  --btn-height-sm: 32px;
  --btn-padding: 12px 24px;
  --btn-padding-sm: 6px 12px;
  
  /* Cards */
  --card-padding: 25px;
  --card-padding-sm: 15px;
  
  /* Status Gradients */
  --gradient-total: linear-gradient(135deg, var(--color-primary) 0%, #764ba2 100%);
  --gradient-active: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
  --gradient-example: linear-gradient(135deg, #9b59b6 0%, #e74c3c 100%);
  --gradient-invited: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
  --gradient-confirmed: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
  --gradient-inactive: linear-gradient(135deg, #01757e 0%, #7f8c8d 100%);
  --gradient-cancelled: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
  --gradient-database: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
  
  /* Scrollbar */
  --scrollbar-width: 6px;
  --scrollbar-width-thin: 4px;
  --scrollbar-thumb: var(--border-primary);
  --scrollbar-thumb-hover: var(--color-primary);
  --scrollbar-track: var(--bg-primary);
}

/* Base Styles & Layout */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: var(--line-height-base);
}

/* Touch Optimization */
button, .btn, a, input, select, textarea, 
[onclick], [data-page], .nav-link, .tab-btn,
.action-buttons *, .checkbox-item, .remember-me-label, 
.user-profile, .mobile-menu-toggle, .table-container,
.meldung-action {
  position: relative;
  touch-action: manipulation !important;
  -webkit-tap-highlight-color: var(--color-primary-light) !important;
  cursor: pointer !important;
  pointer-events: auto !important;
  z-index: var(--z-overlay) !important;
  transform: translateZ(0) !important;
  -webkit-transform: translateZ(0) !important;
  will-change: transform !important;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: var(--scrollbar-width);
  height: var(--scrollbar-width);
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: calc(var(--scrollbar-width) / 2);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: calc(var(--scrollbar-width) / 2);
  transition: var(--transition-all);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

::-webkit-scrollbar-corner {
  background: var(--scrollbar-track);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* Buttons */
.btn {
  padding: var(--btn-padding);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: var(--transition-all);
  text-decoration: none;
  display: inline-block;
  text-align: center;
  min-height: var(--btn-height);
}

.btn-primary {
  background: var(--color-success-dark);
  color: var(--text-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary);
}

.btn-success {
  background: var(--color-success);
  color: var(--text-primary);
}

.btn-success:hover {
  background: var(--color-success-dark);
}

.btn-danger {
  background: var(--color-error);
  color: var(--text-primary);
}

.btn-danger:hover {
  background: var(--color-error-dark);
}

.btn-info {
  background: var(--color-info);
  color: var(--text-primary);
}

.btn-info:hover {
  background: var(--color-info-dark);
}

.btn-warning {
  background: var(--color-warning);
  color: var(--text-primary);
}

.btn-warning:hover {
  background: var(--color-warning-dark);
}

.btn-secondary {
  background: var(--color-muted);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--color-muted-dark);
}

.btn-sm {
  padding: var(--btn-padding-sm);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  min-height: var(--btn-height-sm);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

.form-control {
  width: 100%;
  padding: var(--input-padding);
  background: var(--bg-tertiary);
  border: var(--input-border-width) solid var(--border-primary);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-base);
  min-height: var(--input-height);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
}

.form-control textarea {
  resize: vertical;
  min-height: 100px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.filter-select {
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border: var(--input-border-width) solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-base);
}

/* Mobile Header */
.mobile-header {
  display: none;
  background: var(--bg-secondary);
  padding: var(--spacing-md) var(--spacing-lg);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-md);
  height: var(--mobile-header-height);
}

.mobile-menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  z-index: 1101;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 3px;
  background: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: var(--transition-all);
}

.mobile-menu-toggle:hover span {
  background: var(--color-primary);
}

.mobile-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.mobile-logo-image {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.mobile-title {
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  padding: var(--spacing-lg) 0;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  transition: var(--transition-all);
  display: flex;
  flex-direction: column;
  z-index: 1050;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar-header {
  padding: 0 var(--spacing-lg) var(--spacing-2xl);
  border-bottom: 1px solid var(--border-secondary);
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.sidebar-logo-image {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  object-fit: contain;
  flex-shrink: 0;
}

.sidebar-logo-text {
  flex: 1;
  min-width: 0;
}

.sidebar-logo-text h2 {
  color: var(--text-primary);
  font-size: var(--font-size-xl);
  margin-bottom: 2px;
}

.sidebar-subtitle {
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
}

.sidebar-close {
  display: none;
  position: absolute;
  top: 0;
  right: var(--spacing-lg);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: var(--transition-all);
  z-index: 1051;
}

.sidebar-close:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.sidebar-close svg {
  fill: currentColor;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1040;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.sidebar-overlay.active {
  opacity: 1;
}

.nav-menu {
  list-style: none;
  flex: 1;
}

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

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--text-tertiary);
  text-decoration: none;
  transition: var(--transition-all);
  position: relative;
}

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

.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
}

.nav-icon {
  width: 20px;
  height: 20px;
  margin-right: var(--spacing-md);
  fill: currentColor;
  flex-shrink: 0;
}

.nav-text {
  flex: 1;
}

/* User Section */
.sidebar-user {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-secondary);
  margin-top: auto;
}

.user-profile {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition-all);
  position: relative;
}

.user-profile:hover {
  background: rgba(102, 126, 234, 0.2);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-round);
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
  margin-right: var(--spacing-sm);
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-status {
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
  text-transform: capitalize;
}

.user-edit-icon {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  width: 20px;
  height: 20px;
  background: rgba(102, 126, 234, 0.2);
  border-radius: var(--radius-round);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-all);
  color: var(--text-tertiary);
}

.user-profile:hover .user-edit-icon {
  opacity: 1;
  background: rgba(102, 126, 234, 0.3);
  color: var(--color-primary);
}

.logout-btn {
  width: 100%;
  font-size: var(--font-size-sm);
  padding: var(--spacing-sm) var(--spacing-md);
}

.notification-badge {
    position: absolute;
    right: 12px;
    background: #e74c3c;
    color: white;
    border-radius: 50%;
    min-width: 18px;
    height: 18px;
    font-size: 11px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    z-index: 10;
    
}

.notification-badge:empty {
    display: none !important;
}

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  padding: var(--spacing-lg);
  width: calc(100% - var(--sidebar-width));
  transition: var(--transition-all);
}

.sidebar.collapsed + .main-content {
  margin-left: var(--sidebar-collapsed-width);
  width: calc(100% - var(--sidebar-collapsed-width));
}

/* Header */
.header {
  background: var(--bg-secondary);
  padding: var(--spacing-md) var(--card-padding);
  border-radius: var(--radius-xl);
  margin-bottom: var(--card-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  color: var(--text-primary);
  font-size: var(--font-size-2xl);
}

/* Page Content */
.page-content {
  display: none;
}

.page-content.active {
  display: block;
}

/* Dashboard Specific */
.dashboard {
  display: none;
  min-height: 100%;
}

.dashboard.active {
  display: flex;
}

/* Status Badges */
.status-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-admin {
  background: var(--status-admin);
  color: var(--color-error);
}

.status-vertrieb {
  background: var(--status-vertrieb);
  color: var(--color-info);
}

.status-buchhaltung {
  background: var(--status-buchhaltung);
  color: var(--color-warning);
}

.status-praktikant {
  background: var(--status-praktikant);
  color: var(--color-muted);
}

.status-eingeladen {
  background: var(--status-invited);
  color: var(--color-info);
}

.status-bestaetigt, .status-confirmed {
  background: var(--status-confirmed);
  color: var(--color-success);
}

.status-beispiel {
  background: var(--status-example);
  color: var(--color-purple);
}

.status-aktiv {
  background: var(--status-active);
  color: var(--color-success);
}

.status-inaktiv {
  background: var(--status-inactive);
  color: var(--color-muted);
}

.status-gekündigt {
  background: var(--status-cancelled);
  color: var(--color-error);
}

.status-datenbank {
  background: var(--status-database);
  color: var(--color-warning);
}

/* Required Fields */
.required-field label::after {
  content: ' *';
  color: var(--color-error);
  font-weight: var(--font-weight-bold);
}

.required-field-info {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
  font-style: italic;
}

/* Focus indicators */
.btn:focus,
.form-control:focus,
.nav-link:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --mobile-header-height: 60px;
  }

  .sidebar-header {
    display: none;
  }

  .mobile-header {
    display: flex;
  }
  
  body {
    padding-top: var(--mobile-header-height);
  }
  
  .sidebar {
    transform: translateX(-100%);
    z-index: 1060;
    width: var(--sidebar-width);
    top: 0;
    height: 100%;
    padding-top: 80px;
  }
  
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  
  .sidebar-close {
    display: block;
    top: var(--spacing-lg);
  }
  
  .sidebar-overlay {
    display: block;
  }

      .notification-badge {
        top: 10px;
        right: 10px;
        min-width: 16px;
        height: 16px;
        font-size: 10px;
    }
  
  .main-content {
    margin-left: 0;
    width: 100%;
    padding: var(--spacing-md);
  }
  
  .header {
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
  }
  
  .header h1 {
    font-size: var(--font-size-xl);
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --mobile-header-height: 55px;
    --card-padding: 15px;
    --input-height: 48px;
    --btn-height: 44px;
  }
  
  body {
    padding-top: var(--mobile-header-height-sm);
  }
  
  .mobile-header {
    padding: var(--spacing-sm) var(--spacing-md);
    height: var(--mobile-header-height-sm);
  }
  
  .mobile-title {
    font-size: var(--font-size-md);
  }
  
  .mobile-logo-image {
    width: 28px;
    height: 28px;
  }
  
  .sidebar {
    padding-top: 70px;
  }

      .notification-badge {
        top: 8px;
        right: 8px;
        min-width: 14px;
        height: 14px;
        font-size: 9px;
    }
  
  .main-content {
    padding: var(--spacing-lg);
  }
  
  .header {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }
  
  .header h1 {
    font-size: var(--font-size-lg);
  }
  
  .form-control {
    font-size: var(--font-size-md);
  }
  
  .btn {
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .btn-sm {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-sm);
  }
}

/* Pulse animation for notifications */
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7);
    }
    70% {
        box-shadow: 0 0 0 6px rgba(231, 76, 60, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0);
    }
}