* {
  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 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-container {
  width: 100%;
  max-width: 420px;
}

.auth-card {
  background: white;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  padding: 48px 40px;
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
}

.logo {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}

.logo svg {
  filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.3));
}

.auth-header h1 {
  font-size: 32px;
  font-weight: 700;
  color: #1a202c;
  margin-bottom: 8px;
}

.tagline {
  font-size: 14px;
  color: #718096;
  font-weight: 500;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  color: #2d3748;
}

.form-group input {
  padding: 12px 16px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 15px;
  transition: all 0.2s;
  outline: none;
}

.form-group input:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder {
  color: #a0aec0;
}

.error-message {
  padding: 12px 16px;
  background: #fee;
  border: 1px solid #fcc;
  border-radius: 8px;
  color: #c53030;
  font-size: 14px;
  display: none;
  animation: shake 0.3s;
}

.error-message.show {
  display: block;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

.btn-primary {
  padding: 14px 24px;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-loader {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-loader:not([hidden]) {
  display: inline-block;
}

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

.auth-footer {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid #e2e8f0;
  text-align: center;
}

.auth-footer p {
  font-size: 13px;
  color: #718096;
}

.auth-footer strong {
  color: #3b82f6;
  font-weight: 600;
}

@media (max-width: 480px) {
  .auth-card {
    padding: 32px 24px;
  }

  .auth-header h1 {
    font-size: 28px;
  }
}