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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  overflow: hidden;
}

header {
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  color: white;
  padding: 30px;
  text-align: center;
}

h1 {
  font-size: 2.5em;
  margin-bottom: 10px;
}

.status {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 20px;
  font-weight: bold;
  font-size: 0.9em;
}

.status.connected {
  background: #4CAF50;
}

.status.disconnected {
  background: #f44336;
}

.section {
  padding: 30px;
}

h2 {
  color: #333;
  margin-bottom: 15px;
  font-size: 1.3em;
}

#qr-container {
  background: #f5f5f5;
  padding: 40px;
  border-radius: 10px;
  text-align: center;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#qr-container img {
  max-width: 100%;
  height: auto;
}

.upload-area {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

input[type="file"] {
  flex: 1;
  padding: 12px;
  border: 2px dashed #ddd;
  border-radius: 8px;
  cursor: pointer;
}

button {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1em;
  font-weight: bold;
  transition: transform 0.2s;
}

button:hover {
  transform: translateY(-2px);
}

textarea {
  width: 100%;
  padding: 15px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 1em;
  resize: vertical;
  margin-bottom: 20px;
}

.send-btn {
  width: 100%;
  padding: 18px;
  font-size: 1.2em;
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  margin-top: 20px;
}

#contacts-preview {
  background: #f9f9f9;
  padding: 15px;
  border-radius: 8px;
  margin-top: 15px;
  max-height: 200px;
  overflow-y: auto;
}

#progress {
  margin-top: 20px;
  padding: 15px;
  background: #f0f0f0;
  border-radius: 8px;
  display: none;
}

.contact-item {
  background: white;
  padding: 8px 12px;
  margin: 5px 0;
  border-radius: 5px;
  border-left: 4px solid #25D366;
}