* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: Arial, sans-serif;
  background: radial-gradient(circle at top, #f7f7fb, #eff1f8);
  color: #111827;
  padding: 24px;
}

h1 {
  font-size: clamp(32px, 4vw, 48px);
  margin-bottom: 32px;
  text-align: center;
}

.upload-container {
  width: min(640px, 100%);
  background: #ffffffdd;
  border-radius: 20px;
  box-shadow: 0 20px 45px -20px rgba(15, 23, 42, 0.65);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  backdrop-filter: blur(8px);
}

.dropzone {
  border: 2px dashed #6366f1;
  border-radius: 16px;
  padding: 48px 24px;
  text-align: center;
  transition: all 0.2s ease;
  background: rgba(99, 102, 241, 0.04);
  cursor: pointer;
  position: relative;
}

.dropzone.dragover {
  background: rgba(99, 102, 241, 0.12);
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -24px rgba(99, 102, 241, 0.65);
}

.dropzone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.dropzone p {
  margin: 8px 0;
  color: #4b5563;
  font-size: 16px;
}

.dropzone p.strong {
  font-weight: 600;
  color: #1f2937;
  font-size: 18px;
}

button {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px -24px rgba(99, 102, 241, 0.8);
}

button:disabled {
  background: #cbd5f5;
  cursor: not-allowed;
  box-shadow: none;
}

.status {
  min-height: 24px;
  font-size: 15px;
  color: #374151;
  line-height: 1.5;
  word-break: break-all;
}

.status.error {
  color: #dc2626;
}

.status.success {
  color: #166534;
}

.file-info {
  text-align: center;
  padding: 24px;
}

.file-info h2 {
  margin: 0 0 16px 0;
  font-size: 24px;
  color: #1f2937;
}

.file-size {
  margin: 0 0 24px 0;
  color: #6b7280;
  font-size: 16px;
}

.download-button {
  display: inline-block;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  font-family: inherit;
}

.download-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px -24px rgba(99, 102, 241, 0.8);
}

.download-button:active {
  transform: translateY(0);
}