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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  background-size: 200% 200%;
  animation: gradientShift 15s ease infinite;
  min-height: 100vh;
  padding: 20px;
  color: #333;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: backgroundMove 20s linear infinite;
  pointer-events: none;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes backgroundMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(50px, 50px); }
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
  animation: fadeInUp 0.6s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1, h2, h3 {
  margin-bottom: 24px;
  color: white;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  font-size: 32px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h3 {
  font-size: 20px;
  letter-spacing: -0.3px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.header h2 {
  margin: 0;
  color: white;
  font-size: 24px;
}

.header .btn-secondary {
  width: auto;
  padding: 10px 24px;
  margin: 0;
}

.form-group {
  margin-bottom: 16px;
}

label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
  color: white;
  font-size: 14px;
  letter-spacing: 0.5px;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  font-size: 16px;
  color: white;
  transition: all 0.3s ease;
}

input[type="text"]::placeholder,
input[type="password"]::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn {
  width: 100%;
  padding: 14px 28px;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 12px;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
  backdrop-filter: blur(10px);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 6px 25px rgba(0, 0, 0, 0.15);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(-1px);
}

.btn-primary:disabled {
  background: rgba(255, 255, 255, 0.1);
  cursor: not-allowed;
  opacity: 0.5;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.9);
  color: #667eea;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
  background: white;
  transform: translateY(-3px);
  box-shadow: 0 6px 25px rgba(0, 0, 0, 0.15);
}

.upload-area {
  border: 2px dashed rgba(255, 255, 255, 0.4);
  border-radius: 16px;
  padding: 50px 30px;
  text-align: center;
  cursor: pointer;
  transition: all 0.4s ease;
  position: relative;
  background: rgba(255, 255, 255, 0.05);
  overflow: hidden;
}

.upload-area::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.upload-area:hover::before {
  left: 100%;
}

.upload-area:hover {
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.02);
}

.upload-area.dragover {
  border-color: white;
  background: rgba(255, 255, 255, 0.15);
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.3);
}

.upload-placeholder svg {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 16px;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.1));
}

.upload-placeholder p {
  color: white;
  margin: 12px 0;
  font-size: 18px;
  font-weight: 600;
}

.upload-hint {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 8px;
}

.preview-area {
  position: relative;
  animation: zoomIn 0.4s ease;
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.preview-area img {
  max-width: 100%;
  max-height: 350px;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-remove {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 59, 48, 0.9);
  backdrop-filter: blur(10px);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  font-size: 24px;
  cursor: pointer;
  line-height: 1;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 59, 48, 0.3);
}

.btn-remove:hover {
  background: rgba(255, 59, 48, 1);
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 6px 20px rgba(255, 59, 48, 0.5);
}

#currentQrcode {
  text-align: center;
}

#currentQrcode img {
  max-width: 100%;
  max-height: 450px;
  border-radius: 16px;
  margin: 20px 0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  transition: transform 0.3s ease;
}

#currentQrcode img:hover {
  transform: scale(1.05);
}

.loading {
  color: rgba(255, 255, 255, 0.8);
  padding: 30px;
  font-size: 16px;
}

.error-message,
.message {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.error-message {
  background: rgba(255, 59, 48, 0.2);
  color: white;
  border-color: rgba(255, 59, 48, 0.4);
}

.message.success {
  background: rgba(52, 199, 89, 0.2);
  color: white;
  border-color: rgba(52, 199, 89, 0.4);
}

.message.error {
  background: rgba(255, 59, 48, 0.2);
  color: white;
  border-color: rgba(255, 59, 48, 0.4);
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal.active {
  display: flex;
}

.modal-content {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 36px;
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.3);
  animation: modalSlideIn 0.4s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-content h3 {
  margin-bottom: 20px;
  color: #667eea;
  font-size: 24px;
  text-shadow: none;
}

.modal-content p {
  margin-bottom: 28px;
  color: #4a5568;
  font-size: 16px;
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: 16px;
}

.modal-actions .btn {
  margin-top: 0;
}

.modal-actions .btn-primary {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
}

.modal-actions .btn-secondary {
  background: white;
  color: #667eea;
  border: 2px solid #667eea;
}

@media (max-width: 640px) {
  body {
    padding: 16px;
  }

  .card {
    padding: 24px;
    border-radius: 16px;
  }

  h1 {
    font-size: 26px;
  }

  .upload-area {
    padding: 40px 20px;
  }

  .header {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .header .btn-secondary {
    width: 100%;
  }

  .modal-content {
    padding: 28px;
  }

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