/* ============================================
   DHSN Stundenplan-Vergleicher - Styles
   ============================================ */

:root {
  /* Colors */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #10b981;
  --secondary-dark: #059669;
  --accent: #f59e0b;
  
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --bg-input: #0f172a;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border: #334155;
  --border-light: #475569;
  
  --success: #22c55e;
  --error: #ef4444;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Base Styles
   ============================================ */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================
   Header
   ============================================ */

.header {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-dark) 100%);
  border-bottom: 1px solid var(--border);
  padding: var(--space-lg) var(--space-xl);
}

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

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

.logo-icon {
  font-size: 2.5rem;
}

.logo-text h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text .subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================
   Main Content
   ============================================ */

.main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl);
  width: 100%;
}

/* ============================================
   Panels
   ============================================ */

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.panel h2 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.panel-icon {
  font-size: 1.5rem;
}

.panel-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
}

/* ============================================
   Search Box
   ============================================ */

.search-box {
  position: relative;
  margin-bottom: var(--space-lg);
}

.search-box input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  padding-left: 3rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s ease;
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
}

/* ============================================
   Groups Container
   ============================================ */

.groups-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-sm);
  max-height: 300px;
  overflow-y: auto;
  padding: var(--space-sm);
  background: var(--bg-input);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.groups-container::-webkit-scrollbar {
  width: 8px;
}

.groups-container::-webkit-scrollbar-track {
  background: var(--bg-dark);
  border-radius: 4px;
}

.groups-container::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

.groups-container::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Group Chip */
.group-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.group-chip:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
}

.group-chip.selected {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary);
}

.group-chip .group-name {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.group-chip .group-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

/* Loading */
.loading {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  color: var(--text-secondary);
  gap: var(--space-md);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   Selected Groups
   ============================================ */

.selected-groups {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

.selected-groups h3 {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.selected-groups h3 span {
  color: var(--primary-light);
  font-weight: 600;
}

.selected-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  min-height: 2.5rem;
}

.selected-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
}

.selected-tag .remove-tag {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  font-size: 0.75rem;
  transition: background 0.2s ease;
}

.selected-tag .remove-tag:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Time Filters
   ============================================ */

.time-filters {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.time-input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.time-input-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.time-input-group select {
  padding: var(--space-sm) var(--space-lg);
  padding-right: 2.5rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.time-input-group select:focus {
  outline: none;
  border-color: var(--primary);
}

/* ============================================
   Search Action Button
   ============================================ */

.search-action {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--secondary);
  color: var(--secondary);
  transform: translateY(-2px);
}

.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary.copied {
  border-color: var(--success);
  color: var(--success);
}

.btn-icon {
  font-size: 1.25rem;
}

/* ============================================
   Results Panel
   ============================================ */

.results-panel {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.results-info {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  background: var(--bg-input);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.results-info .groups-compared {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.results-info .group-badge {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--text-primary);
}

/* Results Container */
.results-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.week-section {
  background: var(--bg-input);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.week-header {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--primary-light);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border);
}

.days-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.day-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--border);
}

.day-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border);
}

.day-name {
  font-weight: 600;
  color: var(--text-primary);
}

.day-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.time-slots {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.time-slot {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.2) 0%, rgba(16, 185, 129, 0.2) 100%);
  border: 1px solid var(--secondary);
  border-radius: var(--radius-sm);
}

.time-slot .slot-time {
  font-weight: 600;
  color: var(--secondary);
  font-size: 0.875rem;
}

.time-slot .slot-duration {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: auto;
}

/* No Results */
.no-results {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-secondary);
}

.no-results-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.no-results h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

/* Error State */
.error-message {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  border-radius: var(--radius-md);
  color: var(--error);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  text-align: center;
  padding: var(--space-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
}

.footer a {
  color: var(--primary-light);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
  .header {
    padding: var(--space-md);
  }

  .logo-text h1 {
    font-size: 1.25rem;
  }

  .main {
    padding: var(--space-md);
  }

  .panel {
    padding: var(--space-md);
  }

  .groups-container {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    max-height: 250px;
  }

  .time-filters {
    flex-direction: column;
    gap: var(--space-md);
  }

  .days-grid {
    grid-template-columns: 1fr;
  }

  .btn-primary {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .logo-icon {
    font-size: 1.75rem;
  }

  .logo-text h1 {
    font-size: 1rem;
  }

  .logo-text .subtitle {
    font-size: 0.75rem;
  }

  .group-chip {
    padding: var(--space-xs) var(--space-sm);
  }

  .group-chip .group-name {
    font-size: 0.75rem;
  }

  .group-chip .group-desc {
    display: none;
  }
}