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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
  min-height: 100vh;
  padding: 20px;
  color: #1e293b;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

header {
  background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
  color: white;
  padding: 32px 24px;
  text-align: center;
}

header h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

header p {
  opacity: 0.9;
  font-size: 15px;
}

main {
  padding: 32px 24px;
}

.upload-area {
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: #f8fafc;
}

.upload-area:hover {
  border-color: #3b82f6;
  background: #f0f7ff;
}

.upload-area.dragover {
  border-color: #3b82f6;
  background: #e0f2fe;
  transform: scale(1.01);
}

.upload-content {
  pointer-events: none;
}

.upload-icon {
  width: 48px;
  height: 48px;
  color: #94a3b8;
  margin-bottom: 16px;
}

.upload-text {
  font-size: 16px;
  color: #475569;
  margin-bottom: 8px;
}

.upload-hint {
  font-size: 13px;
  color: #94a3b8;
}

.file-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  padding: 12px 16px;
  background: #f0f9ff;
  border-radius: 8px;
  border: 1px solid #bae6fd;
}

.file-name {
  font-weight: 600;
  color: #0369a1;
}

.file-size {
  color: #0891b2;
  font-size: 14px;
}

.progress-area {
  margin-top: 24px;
}

.progress-bar {
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #6366f1);
  border-radius: 4px;
  width: 0%;
  transition: width 0.3s ease;
  animation: progress-pulse 1.5s ease-in-out infinite;
}

@keyframes progress-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.progress-text {
  text-align: center;
  margin-top: 12px;
  color: #64748b;
  font-size: 14px;
}

.result-area {
  margin-top: 24px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.result-header h2 {
  font-size: 20px;
  font-weight: 600;
}

.image-count {
  background: #e0f2fe;
  color: #0284c7;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  max-height: 400px;
  overflow-y: auto;
  padding: 4px;
}

.image-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.image-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.image-preview {
  width: 100%;
  height: 120px;
  object-fit: cover;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-preview svg {
  width: 32px;
  height: 32px;
  color: #cbd5e1;
}

.image-info {
  padding: 10px 12px;
  border-top: 1px solid #e2e8f0;
}

.image-name {
  font-size: 12px;
  font-weight: 600;
  color: #334155;
  word-break: break-all;
  margin-bottom: 4px;
}

.image-meta {
  font-size: 11px;
  color: #94a3b8;
}

.actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid #e2e8f0;
}

.btn {
  padding: 12px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

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

.btn-secondary {
  background: #f1f5f9;
  color: #475569;
  border: 1px solid #e2e8f0;
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: #94a3b8;
}

.empty-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
}

footer {
  padding: 20px 24px;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  text-align: center;
}

footer p {
  font-size: 13px;
  color: #64748b;
  font-family: 'Monaco', 'Consolas', monospace;
}

@media (max-width: 600px) {
  header h1 {
    font-size: 22px;
  }
  
  .image-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }
  
  .actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
}