/* T Umweltdienste Branding Colors */
:root {
  --tu-dunkelblau: #002F5D;
  --tu-hellblau: #0786BD;
  --tu-gruen: #89BA15;
  --tu-orange: #EE7F00;
  --tu-weiss: #FFFFFF;
  --tu-grau-hell: #F5F5F5;
  --tu-grau: #E0E0E0;
  --tu-grau-dunkel: #666666;
  --tu-rot: #D32F2F;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 3px 6px rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.12);
  --shadow-lg: 0 10px 20px rgba(0,0,0,0.15), 0 3px 6px rgba(0,0,0,0.10);

  --border-radius: 8px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, var(--tu-dunkelblau) 0%, var(--tu-hellblau) 100%);
  min-height: 100vh;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  text-align: center;
  padding: 30px 0;
  color: var(--tu-weiss);
}

.logo {
  max-width: 200px;
  height: auto;
  margin-bottom: 15px;
}

.header h1 {
  font-size: 1.8rem;
  font-weight: 600;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Cards */
.card {
  background: var(--tu-weiss);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.card-header h2 {
  font-size: 1.3rem;
  color: var(--tu-dunkelblau);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--tu-hellblau);
  color: var(--tu-weiss);
}

.btn-primary:hover {
  background: var(--tu-dunkelblau);
}

.btn-secondary {
  background: var(--tu-grau-hell);
  color: var(--tu-dunkelblau);
  border: 1px solid var(--tu-grau);
}

.btn-secondary:hover {
  background: var(--tu-grau);
}

.btn-success {
  background: var(--tu-gruen);
  color: var(--tu-weiss);
}

.btn-success:hover {
  background: #6F9A10;
}

.btn-danger {
  background: var(--tu-rot);
  color: var(--tu-weiss);
}

.btn-danger:hover {
  background: #B71C1C;
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.1rem;
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-loading {
  display: none;
}

.btn:disabled .btn-text {
  display: none;
}

.btn:disabled .btn-loading {
  display: inline-flex;
}

/* Form Elements */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--tu-dunkelblau);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--tu-grau);
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
}

.form-group input:focus {
  outline: none;
  border-color: var(--tu-hellblau);
  box-shadow: 0 0 0 3px rgba(7, 134, 189, 0.2);
}

.error-text {
  color: var(--tu-rot);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* Loading State */
.loading-container {
  text-align: center;
  padding: 60px 20px;
  color: var(--tu-weiss);
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255,255,255,0.3);
  border-top-color: var(--tu-weiss);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

.spinner-small {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: var(--tu-weiss);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
}

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

/* Error State */
.error-container {
  text-align: center;
  padding: 40px 20px;
}

.error-container .card {
  max-width: 400px;
  margin: 0 auto;
}

.error-icon {
  width: 60px;
  height: 60px;
  background: var(--tu-rot);
  color: var(--tu-weiss);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: bold;
  margin: 0 auto 20px;
}

.error-container h2 {
  color: var(--tu-rot);
  margin-bottom: 10px;
}

.error-container p {
  color: var(--tu-grau-dunkel);
  margin-bottom: 20px;
}

/* Password Container */
.password-container {
  flex: 1;
  display: flex;
  align-items: center;
}

.password-container .card {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

/* Session Info */
.session-info h2 {
  color: var(--tu-dunkelblau);
  margin-bottom: 10px;
}

.session-info .description {
  color: var(--tu-grau-dunkel);
  margin-bottom: 16px;
}

.session-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--tu-grau);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-label {
  font-size: 0.85rem;
  color: var(--tu-grau-dunkel);
}

.meta-value {
  font-weight: 500;
  color: var(--tu-dunkelblau);
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--tu-hellblau);
  border-radius: var(--border-radius);
  padding: 40px 20px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--tu-gruen);
  background: rgba(137, 186, 21, 0.1);
}

.drop-zone-content {
  pointer-events: none;
}

.drop-zone label {
  pointer-events: auto;
  cursor: pointer;
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 15px;
}

.drop-text {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--tu-dunkelblau);
  margin-bottom: 8px;
}

.drop-subtext {
  color: var(--tu-grau-dunkel);
  margin-bottom: 12px;
}

.allowed-types {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--tu-grau-dunkel);
}

/* Upload Queue */
.upload-queue h3 {
  color: var(--tu-dunkelblau);
  margin-bottom: 16px;
}

.queue-list {
  margin-bottom: 16px;
}

.queue-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--tu-grau-hell);
  border-radius: var(--border-radius);
  margin-bottom: 8px;
}

.queue-item .file-icon {
  font-size: 1.5rem;
}

.queue-item .file-info {
  flex: 1;
  min-width: 0;
}

.queue-item .file-name {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.queue-item .file-size {
  font-size: 0.85rem;
  color: var(--tu-grau-dunkel);
}

.queue-item .remove-btn {
  background: none;
  border: none;
  color: var(--tu-rot);
  cursor: pointer;
  padding: 4px;
  font-size: 1.2rem;
}

.queue-actions {
  display: flex;
  gap: 12px;
}

/* Uploaded Files */
.uploaded-files h3 {
  color: var(--tu-dunkelblau);
  margin-bottom: 16px;
}

.files-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--tu-grau-hell);
  border-radius: var(--border-radius);
}

.file-item.uploading {
  background: rgba(7, 134, 189, 0.1);
}

.file-item.success {
  background: rgba(137, 186, 21, 0.1);
  border-left: 3px solid var(--tu-gruen);
}

.file-item.error {
  background: rgba(211, 47, 47, 0.1);
  border-left: 3px solid var(--tu-rot);
}

.file-item .file-icon {
  font-size: 1.5rem;
}

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

.file-item .file-name {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-item .file-size {
  font-size: 0.85rem;
  color: var(--tu-grau-dunkel);
}

.file-item .file-status {
  font-size: 0.85rem;
}

.file-item .file-status.success {
  color: var(--tu-gruen);
}

.file-item .file-status.error {
  color: var(--tu-rot);
}

.file-item .delete-btn {
  background: none;
  border: none;
  color: var(--tu-rot);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 0.85rem;
  opacity: 0.7;
  transition: var(--transition);
}

.file-item .delete-btn:hover {
  opacity: 1;
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--tu-grau);
  border-radius: 2px;
  margin-top: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--tu-hellblau);
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* Complete Section */
.complete-section {
  text-align: center;
  padding: 20px 0;
}

.complete-hint {
  margin-top: 12px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
}

/* Success State */
.success-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  color: var(--tu-weiss);
}

.success-icon {
  width: 80px;
  height: 80px;
  background: var(--tu-gruen);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin-bottom: 20px;
}

.success-container h2 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.success-container p {
  font-size: 1.1rem;
}

.success-subtext {
  margin-top: 20px;
  opacity: 0.8;
}

/* Footer */
.footer {
  text-align: center;
  padding: 20px 0;
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  margin-top: auto;
}

.powered-by {
  margin-top: 4px;
  font-size: 0.75rem;
  opacity: 0.6;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding: 10px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .card {
    padding: 16px;
  }

  .drop-zone {
    padding: 30px 15px;
  }

  .session-meta {
    grid-template-columns: 1fr;
  }

  .queue-actions {
    flex-direction: column;
  }

  .queue-actions .btn {
    width: 100%;
  }
}