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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  background: linear-gradient(135deg, #e63948 0%, #fdac56 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-container {
  width: 100%;
  max-width: 400px;
}

.auth-card {
  background: white;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  padding: 40px;
  animation: slideUp 0.3s ease-out;
}

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

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

.auth-header i {
  font-size: 56px;
  color: #e63948;
  margin-bottom: 16px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.auth-header h1 {
  font-size: 24px;
  color: #333;
  font-weight: 600;
}

.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: 500;
  color: #555;
}

.form-group input {
  padding: 12px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 4px;
  font-size: 16px;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: #e63948;
}

.form-group small {
  font-size: 12px;
  color: #888;
}

.error-message {
  display: none;
  padding: 12px;
  background: #ffebee;
  color: #c62828;
  border-radius: 4px;
  font-size: 14px;
  text-align: center;
}

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

.btn-primary {
  padding: 14px 24px;
  background: #e63948;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover {
  background: #d32f3f;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.auth-footer {
  margin-top: 24px;
  text-align: center;
  font-size: 14px;
  color: #666;
}

.auth-footer a {
  color: #e63948;
  text-decoration: none;
  font-weight: 500;
}

.auth-footer a:hover {
  text-decoration: underline;
}

/* レスポンシブ対応 */
@media (max-width: 480px) {
  .auth-card {
    padding: 24px;
  }

  .auth-header h1 {
    font-size: 20px;
  }

  .auth-header i {
    font-size: 40px;
  }
}