/* Google Fonts import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Farbpalette */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --primary: #6366f1; /* Indigo */
  --primary-hover: #4f46e5;
  --primary-light: #e0e7ff;
  
  --secondary: #a855f7; /* Purple */
  --secondary-light: #f3e8ff;
  
  --accent-ac1: #4f46e5;
  --accent-ac1-bg: #e0e7ff;
  
  --accent-ac2: #9333ea;
  --accent-ac2-bg: #f3e8ff;
  
  --success: #10b981; /* Emerald */
  --success-bg: #ecfdf5;
  --danger: #ef4444; /* Rose */
  --danger-bg: #fef2f2;
  --danger-hover: #dc2626;
  
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --primary-light: #312e81;
    
    --secondary: #c084fc;
    --secondary-light: #581c87;
    
    --accent-ac1: #818cf8;
    --accent-ac1-bg: #1e1b4b;
    
    --accent-ac2: #c084fc;
    --accent-ac2-bg: #3b0764;
    
    --success: #34d399;
    --success-bg: #064e3b;
    --danger: #f87171;
    --danger-bg: #7f1d1d;
    --danger-hover: #ef4444;
    
    --border-color: #334155;
  }
}

/* Reset & Basis-Stile */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1rem;
  flex-grow: 1;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 2.5rem;
  position: relative;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Tabs & Controls */
.controls-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.tabs {
  display: flex;
  background-color: var(--bg-secondary);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.tab-btn {
  background: none;
  border: none;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.action-buttons {
  display: flex;
  gap: 0.75rem;
}

.btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn:hover {
  border-color: var(--text-muted);
  background-color: var(--bg-tertiary);
}

.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-danger {
  background-color: var(--danger);
  border-color: var(--danger);
  color: #ffffff;
}

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

/* Alert Info */
.info-banner {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.info-banner p {
  font-size: 0.925rem;
  color: var(--text-secondary);
}

/* Kalender-Ansicht */
.calendar-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.day-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
}

.day-card:hover {
  box-shadow: var(--shadow-md);
}

.day-header {
  background-color: var(--bg-tertiary);
  padding: 1rem 1.5rem;
  font-weight: 600;
  font-size: 1.1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

.day-header svg {
  color: var(--primary);
}

.slots-list {
  display: flex;
  flex-direction: column;
  divide-y: 1px solid var(--border-color);
}

.slot-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 1rem;
  transition: var(--transition);
}

.slot-item:last-child {
  border-bottom: none;
}

.slot-time-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 220px;
}

.slot-time {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.slot-type-badge {
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-lg);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-block;
}

.slot-type-ac1 {
  background-color: var(--accent-ac1-bg);
  color: var(--accent-ac1);
}

.slot-type-ac2 {
  background-color: var(--accent-ac2-bg);
  color: var(--accent-ac2);
}

.slot-type-badge-interactive {
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
  border: 1.5px solid transparent;
}

.slot-type-badge-interactive:hover {
  transform: translateY(-1px);
}

.slot-type-badge-interactive.active.slot-type-ac1 {
  background-color: var(--accent-ac1-bg);
  color: var(--accent-ac1);
  border-color: var(--accent-ac1);
}

.slot-type-badge-interactive.active.slot-type-ac2 {
  background-color: var(--accent-ac2-bg);
  color: var(--accent-ac2);
  border-color: var(--accent-ac2);
}

.slot-type-badge-interactive.inactive {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1.5px dashed var(--border-color);
  opacity: 0.5;
}

.slot-type-selector {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.slot-seats {
  display: flex;
  gap: 0.75rem;
  flex-grow: 1;
  max-width: 500px;
  justify-content: flex-end;
}

/* Sitze (Bookings) */
.seat-btn {
  flex: 1;
  min-width: 160px;
  max-width: 220px;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 500;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.seat-free {
  background-color: transparent;
  border: 1.5px dashed var(--border-color);
  color: var(--text-secondary);
}

.seat-free:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.seat-booked {
  background-color: var(--bg-tertiary);
  border: 1.5px solid var(--border-color);
  color: var(--text-primary);
  cursor: not-allowed;
  font-weight: 600;
}

.seat-booked-admin {
  background-color: var(--primary-light);
  border: 1.5px solid var(--primary);
  color: var(--text-primary);
  cursor: pointer;
}

.seat-booked-admin:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.seat-student-info {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.seat-email {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 0.1rem;
}

.slot-delete-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slot-delete-btn:hover {
  color: var(--danger);
  background-color: var(--danger-bg);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 460px;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
}

.modal-overlay.open .modal {
  transform: scale(1);
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 700;
  font-size: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  background-color: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Formulare */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="time"],
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-row {
  display: flex;
  gap: 1rem;
}

.form-row .form-group {
  flex: 1;
}

/* Admin-Panel Layout */
.admin-section {
  display: none;
  animation: fadeIn 0.3s ease;
}

.admin-section.active {
  display: block;
}

.admin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .admin-grid {
    grid-template-columns: 320px 1fr;
  }
}

.admin-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.admin-panel-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

.admin-panel-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  color: var(--text-primary);
}

/* Keyframes */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-left: 4px solid var(--primary);
  border: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  pointer-events: auto;
  animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast.toast-success {
  border-left: 4px solid var(--success);
}

.toast.toast-error {
  border-left: 4px solid var(--danger);
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
}

.empty-state svg {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.empty-state h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 320px;
  margin: 0 auto;
}

/* Responsive fixes */
@media (max-width: 600px) {
  .slot-item {
    flex-direction: column;
    align-items: flex-start;
  }
  .slot-seats {
    width: 100%;
    justify-content: flex-start;
  }
  .seat-btn {
    max-width: none;
  }
}

/* Logo Header Styling */
.logo-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  margin-bottom: 2.5rem;
  width: 100%;
  gap: 2rem;
  flex-wrap: wrap;
}

.header-logo {
  width: 100%;
  max-width: 400px;
  height: auto;
  max-height: 150px;
  object-fit: contain;
}

@media (max-width: 768px) {
  .logo-header {
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
  }
  .header-logo {
    max-width: 300px;
  }
}